HTML form action and onsubmit issues

You should stop the submit procedure by returning false on the onsubmit callback.

<script>
    function checkRegistration(){
        if(!form_valid){
            alert('Given data is not correct');
            return false;
        }
        return true;
    }
</script>

<form onsubmit="return checkRegistration()"...

Here you have a fully working example. The form will submit only when you write google into input, otherwise it will return an error:

<script>
    function checkRegistration(){
        var form_valid = (document.getElementById('some_input').value == 'google');
        if(!form_valid){
            alert('Given data is incorrect');
            return false;
        }
        return true;
    }
</script>

<form onsubmit="return checkRegistration()" method="get" action="http://google.com">
    Write google to go to google...<br/>
    <input type="text" id="some_input" value=""/>
    <input type="submit" value="google it"/>
</form>

Adding dictionaries together, Python

You are looking for the update method

dic0.update( dic1 )
print( dic0 )

gives

{'dic0': 0, 'dic1': 1}

Running an executable in Mac Terminal

Unix will only run commands if they are available on the system path, as you can view by the $PATH variable

echo $PATH

Executables located in directories that are not on the path cannot be run unless you specify their full location. So in your case, assuming the executable is in the current directory you are working with, then you can execute it as such

./my-exec

Where my-exec is the name of your program.

My Application Could not open ServletContext resource

Quote from the Spring reference doc:

Upon initialization of a DispatcherServlet, Spring MVC looks for a file named [servlet-name]-servlet.xml in the WEB-INF directory of your web application and creates the beans defined there...

Your servlet is called spring-dispatcher, so it looks for /WEB-INF/spring-dispatcher-servlet.xml. You need to have this servlet configuration, and define web related beans in there (like controllers, view resolvers, etc). See the linked documentation for clarification on the relation of servlet contexts to the global application context (which is the app-config.xml in your case).

One more thing, if you don't like the naming convention of the servlet config xml, you can specify your config explicitly:

<servlet>
    <servlet-name>spring-dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

Add Custom Headers using HttpWebRequest

IMHO it is considered as malformed header data.

You actually want to send those name value pairs as the request content (this is the way POST works) and not as headers.

The second way is true.

Installing SQL Server 2012 - Error: Prior Visual Studio 2010 instances requiring update

there are two way:

First :

Inside your CD of SQL Server 2012

you can go to this path \redist\VisualStudioShell.

And you most install this file VS10sp1-KB983509.msp.

After several minutes your problem fix.

Restart your computer and then fire SetUp of SQL Server 2012.

See this picture.

enter image description here

Secound :

But if you want download online Service Pack 1 view This Link

And press download.

After download run this exe file and let it download and fix your VS2010 to VS2010 SP1.

And then restart your windows.

After this operation you can install SQL Server 2012

enter image description here

What to do with commit made in a detached head

Alternatively, you could cherry-pick the commit-id onto your branch.

<commit-id> made in detached head state

git checkout master

git cherry-pick <commit-id>

No temporary branches, no merging.

The controller for path was not found or does not implement IController

In my case namespaces parameter was not matching the namespace of the controller.

public override void RegisterArea(AreaRegistrationContext context) 
{
    context.MapRoute(
        "Admin_default",
        "Admin/{controller}/{action}/{id}",
        new {controller = "Home", action = "Index", id = UrlParameter.Optional },
        namespaces: new[] { "Web.Areas.Admin.Controllers" }
    );
}

How to redirect to a route in laravel 5 by using href tag if I'm not using blade or any template?

In addition to @chanafdo answer, you can use route name

when working with laravel blade

<a href="{{route('login')}}">login here</a> with parameter in route name

when go to url like URI: profile/{id} <a href="{{route('profile', ['id' => 1])}}">login here</a>

without blade

<a href="<?php echo route('login')?>">login here</a>

with parameter in route name

when go to url like URI: profile/{id} <a href="<?php echo route('profile', ['id' => 1])?>">login here</a>

As of laravel 5.2 you can use @php @endphp to create as <?php ?> in laravel blade. Using blade your personal opinion but I suggest to use it. Learn it. It has many wonderful features as template inheritance, Components & Slots,subviews etc...

Forward slash in Java Regex

The problem is actually that you need to double-escape backslashes in the replacement string. You see, "\\/" (as I'm sure you know) means the replacement string is \/, and (as you probably don't know) the replacement string \/ actually just inserts /, because Java is weird, and gives \ a special meaning in the replacement string. (It's supposedly so that \$ will be a literal dollar sign, but I think the real reason is that they wanted to mess with people. Other languages don't do it this way.) So you have to write either:

"Hello/You/There".replaceAll("/", "\\\\/");

or:

"Hello/You/There".replaceAll("/", Matcher.quoteReplacement("\\/"));

(Using java.util.regex.Matcher.quoteReplacement(String).)

What's the difference between primitive and reference types?

As many have stated more or less correctly what reference and primitive types are, one might be interested that we have some more relevant types in Java. Here is the complete lists of types in java (as far as I am aware of (JDK 11)).

Primitive Type

Describes a value (and not a type).

Reference Type

Describes a concrete type which instances extend Object (interface, class, enum, array). Furthermore TypeParameter is actually a reference type!

Integer

Note: The difference between primitive and reference type makes it necessary to rely on boxing to convert primitives in Object instances and vise versa.

Note2: A type parameter describes a type having an optional lower or upper bound and can be referenced by name within its context (in contrast to the wild card type). A type parameter typically can be applied to parameterized types (classes/interfaces) and methods. The parameter type defines a type identifier.

Wildcard Type

Expresses an unknown type (like any in TypeScript) that can have a lower or upper bound by using super or extend.

? extends List<String>
? super ArrayList<String>

Void Type

Nothingness. No value/instance possible.

void method();

Null Type

The only representation is 'null'. It is used especially during type interference computations. Null is a special case logically belonging to any type (can be assigned to any variable of any type) but is actual not considered an instance of any type (e.g. (null instanceof Object) == false).

null

Union Type

A union type is a type that is actual a set of alternative types. Sadly in Java it only exists for the multi catch statement.

catch(IllegalStateException | IOException e) {}

Interference Type

A type that is compatibile to multiple types. Since in Java a class has at most one super class (Object has none), interference types allow only the first type to be a class and every other type must be an interface type.

void method(List<? extends List<?> & Comparable> comparableList) {}

Unknown Type

The type is unknown. That is the case for certain Lambda definitions (not enclosed in brackets, single parameter).

list.forEach(element -> System.out.println(element.toString)); //element is of unknown type

Var Type

Unknown type introduced by a variable declaration spotting the 'var' keyword.

var variable = list.get(0);

How to get jSON response into variable from a jquery script

You should use data.response in your JS instead of json.response.

What is the theoretical maximum number of open TCP connections that a modern Linux box can have

A single listening port can accept more than one connection simultaneously.

There is a '64K' limit that is often cited, but that is per client per server port, and needs clarifying.

Each TCP/IP packet has basically four fields for addressing. These are:

source_ip source_port destination_ip destination_port
<----- client ------> <--------- server ------------>

Inside the TCP stack, these four fields are used as a compound key to match up packets to connections (e.g. file descriptors).

If a client has many connections to the same port on the same destination, then three of those fields will be the same - only source_port varies to differentiate the different connections. Ports are 16-bit numbers, therefore the maximum number of connections any given client can have to any given host port is 64K.

However, multiple clients can each have up to 64K connections to some server's port, and if the server has multiple ports or either is multi-homed then you can multiply that further.

So the real limit is file descriptors. Each individual socket connection is given a file descriptor, so the limit is really the number of file descriptors that the system has been configured to allow and resources to handle. The maximum limit is typically up over 300K, but is configurable e.g. with sysctl.

The realistic limits being boasted about for normal boxes are around 80K for example single threaded Jabber messaging servers.

Keyboard shortcuts are not active in Visual Studio with Resharper installed

I have tried many of the above issues and still had installation problems.

It turns out that downloading the full version (not the web installer), and running it as administrator finally got the latest version installed with no errors in VS 2015.

Copy rows from one Datatable to another DataTable?

foreach (DataRow dr in dataTable1.Rows) {
    if (/* some condition */)
        dataTable2.Rows.Add(dr.ItemArray);
}

The above example assumes that dataTable1 and dataTable2 have the same number, type and order of columns.

Getting value of HTML text input

Depends on where you want to use the email. If it's on the client side, without sending it to a PHP script, JQuery (or javascript) can do the trick.

I've created a fiddle to explain the same - http://jsfiddle.net/qHcpR/

It has an alert which goes off on load and when you click the textbox itself.

How does Python return multiple values from a function?

Since the return statement in getName specifies multiple elements:

def getName(self):
   return self.first_name, self.last_name

Python will return a container object that basically contains them.

In this case, returning a comma separated set of elements creates a tuple. Multiple values can only be returned inside containers.

Let's use a simpler function that returns multiple values:

def foo(a, b):
    return a, b

You can look at the byte code generated by using dis.dis, a disassembler for Python bytecode. For comma separated values w/o any brackets, it looks like this:

>>> import dis
>>> def foo(a, b):
...     return a,b        
>>> dis.dis(foo)
  2           0 LOAD_FAST                0 (a)
              3 LOAD_FAST                1 (b)
              6 BUILD_TUPLE              2
              9 RETURN_VALUE

As you can see the values are first loaded on the internal stack with LOAD_FAST and then a BUILD_TUPLE (grabbing the previous 2 elements placed on the stack) is generated. Python knows to create a tuple due to the commas being present.

You could alternatively specify another return type, for example a list, by using []. For this case, a BUILD_LIST is going to be issued following the same semantics as it's tuple equivalent:

>>> def foo_list(a, b):
...     return [a, b]
>>> dis.dis(foo_list)
  2           0 LOAD_FAST                0 (a)
              3 LOAD_FAST                1 (b)
              6 BUILD_LIST               2
              9 RETURN_VALUE

The type of object returned really depends on the presence of brackets (for tuples () can be omitted if there's at least one comma). [] creates lists and {} sets. Dictionaries need key:val pairs.

To summarize, one actual object is returned. If that object is of a container type, it can contain multiple values giving the impression of multiple results returned. The usual method then is to unpack them directly:

>>> first_name, last_name = f.getName()
>>> print (first_name, last_name)

As an aside to all this, your Java ways are leaking into Python :-)

Don't use getters when writing classes in Python, use properties. Properties are the idiomatic way to manage attributes, for more on these, see a nice answer here.

You have not accepted the license agreements of the following SDK components

Update for macOS Sierra 10.12.6 - Android Studio for Mac 2.3.3

Locate the sdkmanager file usually under:

/Users/YOUR_MAC_USER/Library/Android/sdk/tools/bin

./sdkmanager --licenses

Warning: File /Users/mtro.josevaler**strong text**io/.android/repositories.cfg could not be loaded. 6 of 6 SDK package licenses not accepted. Review licenses that have not been accepted (y/N)? Y

To validate the problem has gone just repeat the operation involved in the license issue.

Run R script from command line

How to run Rmd in command with knitr and rmarkdown by multiple commands and then Upload an HTML file to RPubs

Here is a example: load two libraries and run a R command

R -e 'library("rmarkdown");library("knitr");rmarkdown::render("NormalDevconJuly.Rmd")'

R -e 'library("markdown");rpubsUpload("normalDev","NormalDevconJuly.html")'

Determine which element the mouse pointer is on top of in JavaScript

The target of the mousemove DOM event is the top-most DOM element under the cursor when the mouse moves:

(function(){
    //Don't fire multiple times in a row for the same element
    var prevTarget=null;
    document.addEventListener('mousemove', function(e) {
        //This will be the top-most DOM element under cursor
        var target=e.target;
        if(target!==prevTarget){
            console.log(target);
            prevTarget=target;
        }
    });
})();

This is similar to @Philip Walton's solution, but doesn't require jQuery or a setInterval.

Using .NET, how can you find the mime type of a file based on the file signature not the extension

This class use previous answers to try in 3 different ways: harcoded based on extension, FindMimeFromData API and using registry.

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;

using Microsoft.Win32;

namespace YourNamespace
{
    public static class MimeTypeParser
    {
        [DllImport(@"urlmon.dll", CharSet = CharSet.Auto)]
        private extern static System.UInt32 FindMimeFromData(
                System.UInt32 pBC,
                [MarshalAs(UnmanagedType.LPStr)] System.String pwzUrl,
                [MarshalAs(UnmanagedType.LPArray)] byte[] pBuffer,
                System.UInt32 cbSize,
                [MarshalAs(UnmanagedType.LPStr)] System.String pwzMimeProposed,
                System.UInt32 dwMimeFlags,
                out System.UInt32 ppwzMimeOut,
                System.UInt32 dwReserverd
        );

        public static string GetMimeType(string sFilePath)
        {
            string sMimeType = GetMimeTypeFromList(sFilePath);

            if (String.IsNullOrEmpty(sMimeType))
            {
                sMimeType = GetMimeTypeFromFile(sFilePath);

                if (String.IsNullOrEmpty(sMimeType))
                {
                    sMimeType = GetMimeTypeFromRegistry(sFilePath);
                }
            }

            return sMimeType;
        }

        public static string GetMimeTypeFromList(string sFileNameOrPath)
        {
            string sMimeType = null;
            string sExtensionWithoutDot = Path.GetExtension(sFileNameOrPath).Substring(1).ToLower();

            if (!String.IsNullOrEmpty(sExtensionWithoutDot) && spDicMIMETypes.ContainsKey(sExtensionWithoutDot))
            {
                sMimeType = spDicMIMETypes[sExtensionWithoutDot];
            }

            return sMimeType;
        }

        public static string GetMimeTypeFromRegistry(string sFileNameOrPath)
        {
            string sMimeType = null;
            string sExtension = Path.GetExtension(sFileNameOrPath).ToLower();
            RegistryKey pKey = Registry.ClassesRoot.OpenSubKey(sExtension);

            if (pKey != null && pKey.GetValue("Content Type") != null)
            {
                sMimeType = pKey.GetValue("Content Type").ToString();
            }

            return sMimeType;
        }

        public static string GetMimeTypeFromFile(string sFilePath)
        {
            string sMimeType = null;

            if (File.Exists(sFilePath))
            {
                byte[] abytBuffer = new byte[256];

                using (FileStream pFileStream = new FileStream(sFilePath, FileMode.Open))
                {
                    if (pFileStream.Length >= 256)
                    {
                        pFileStream.Read(abytBuffer, 0, 256);
                    }
                    else
                    {
                        pFileStream.Read(abytBuffer, 0, (int)pFileStream.Length);
                    }
                }

                try
                {
                    UInt32 unMimeType;

                    FindMimeFromData(0, null, abytBuffer, 256, null, 0, out unMimeType, 0);

                    IntPtr pMimeType = new IntPtr(unMimeType);
                    string sMimeTypeFromFile = Marshal.PtrToStringUni(pMimeType);

                    Marshal.FreeCoTaskMem(pMimeType);

                    if (!String.IsNullOrEmpty(sMimeTypeFromFile) && sMimeTypeFromFile != "text/plain" && sMimeTypeFromFile != "application/octet-stream")
                    {
                        sMimeType = sMimeTypeFromFile;
                    }
                }
                catch {}
            }

            return sMimeType;
        }

        private static readonly Dictionary<string, string> spDicMIMETypes = new Dictionary<string, string>
        {
            {"ai", "application/postscript"},
            {"aif", "audio/x-aiff"},
            {"aifc", "audio/x-aiff"},
            {"aiff", "audio/x-aiff"},
            {"asc", "text/plain"},
            {"atom", "application/atom+xml"},
            {"au", "audio/basic"},
            {"avi", "video/x-msvideo"},
            {"bcpio", "application/x-bcpio"},
            {"bin", "application/octet-stream"},
            {"bmp", "image/bmp"},
            {"cdf", "application/x-netcdf"},
            {"cgm", "image/cgm"},
            {"class", "application/octet-stream"},
            {"cpio", "application/x-cpio"},
            {"cpt", "application/mac-compactpro"},
            {"csh", "application/x-csh"},
            {"css", "text/css"},
            {"dcr", "application/x-director"},
            {"dif", "video/x-dv"},
            {"dir", "application/x-director"},
            {"djv", "image/vnd.djvu"},
            {"djvu", "image/vnd.djvu"},
            {"dll", "application/octet-stream"},
            {"dmg", "application/octet-stream"},
            {"dms", "application/octet-stream"},
            {"doc", "application/msword"},
            {"docx","application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
            {"dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template"},
            {"docm","application/vnd.ms-word.document.macroEnabled.12"},
            {"dotm","application/vnd.ms-word.template.macroEnabled.12"},
            {"dtd", "application/xml-dtd"},
            {"dv", "video/x-dv"},
            {"dvi", "application/x-dvi"},
            {"dxr", "application/x-director"},
            {"eps", "application/postscript"},
            {"etx", "text/x-setext"},
            {"exe", "application/octet-stream"},
            {"ez", "application/andrew-inset"},
            {"gif", "image/gif"},
            {"gram", "application/srgs"},
            {"grxml", "application/srgs+xml"},
            {"gtar", "application/x-gtar"},
            {"hdf", "application/x-hdf"},
            {"hqx", "application/mac-binhex40"},
            {"htc", "text/x-component"},
            {"htm", "text/html"},
            {"html", "text/html"},
            {"ice", "x-conference/x-cooltalk"},
            {"ico", "image/x-icon"},
            {"ics", "text/calendar"},
            {"ief", "image/ief"},
            {"ifb", "text/calendar"},
            {"iges", "model/iges"},
            {"igs", "model/iges"},
            {"jnlp", "application/x-java-jnlp-file"},
            {"jp2", "image/jp2"},
            {"jpe", "image/jpeg"},
            {"jpeg", "image/jpeg"},
            {"jpg", "image/jpeg"},
            {"js", "application/x-javascript"},
            {"kar", "audio/midi"},
            {"latex", "application/x-latex"},
            {"lha", "application/octet-stream"},
            {"lzh", "application/octet-stream"},
            {"m3u", "audio/x-mpegurl"},
            {"m4a", "audio/mp4a-latm"},
            {"m4b", "audio/mp4a-latm"},
            {"m4p", "audio/mp4a-latm"},
            {"m4u", "video/vnd.mpegurl"},
            {"m4v", "video/x-m4v"},
            {"mac", "image/x-macpaint"},
            {"man", "application/x-troff-man"},
            {"mathml", "application/mathml+xml"},
            {"me", "application/x-troff-me"},
            {"mesh", "model/mesh"},
            {"mid", "audio/midi"},
            {"midi", "audio/midi"},
            {"mif", "application/vnd.mif"},
            {"mov", "video/quicktime"},
            {"movie", "video/x-sgi-movie"},
            {"mp2", "audio/mpeg"},
            {"mp3", "audio/mpeg"},
            {"mp4", "video/mp4"},
            {"mpe", "video/mpeg"},
            {"mpeg", "video/mpeg"},
            {"mpg", "video/mpeg"},
            {"mpga", "audio/mpeg"},
            {"ms", "application/x-troff-ms"},
            {"msh", "model/mesh"},
            {"mxu", "video/vnd.mpegurl"},
            {"nc", "application/x-netcdf"},
            {"oda", "application/oda"},
            {"ogg", "application/ogg"},
            {"pbm", "image/x-portable-bitmap"},
            {"pct", "image/pict"},
            {"pdb", "chemical/x-pdb"},
            {"pdf", "application/pdf"},
            {"pgm", "image/x-portable-graymap"},
            {"pgn", "application/x-chess-pgn"},
            {"pic", "image/pict"},
            {"pict", "image/pict"},
            {"png", "image/png"}, 
            {"pnm", "image/x-portable-anymap"},
            {"pnt", "image/x-macpaint"},
            {"pntg", "image/x-macpaint"},
            {"ppm", "image/x-portable-pixmap"},
            {"ppt", "application/vnd.ms-powerpoint"},
            {"pptx","application/vnd.openxmlformats-officedocument.presentationml.presentation"},
            {"potx","application/vnd.openxmlformats-officedocument.presentationml.template"},
            {"ppsx","application/vnd.openxmlformats-officedocument.presentationml.slideshow"},
            {"ppam","application/vnd.ms-powerpoint.addin.macroEnabled.12"},
            {"pptm","application/vnd.ms-powerpoint.presentation.macroEnabled.12"},
            {"potm","application/vnd.ms-powerpoint.template.macroEnabled.12"},
            {"ppsm","application/vnd.ms-powerpoint.slideshow.macroEnabled.12"},
            {"ps", "application/postscript"},
            {"qt", "video/quicktime"},
            {"qti", "image/x-quicktime"},
            {"qtif", "image/x-quicktime"},
            {"ra", "audio/x-pn-realaudio"},
            {"ram", "audio/x-pn-realaudio"},
            {"ras", "image/x-cmu-raster"},
            {"rdf", "application/rdf+xml"},
            {"rgb", "image/x-rgb"},
            {"rm", "application/vnd.rn-realmedia"},
            {"roff", "application/x-troff"},
            {"rtf", "text/rtf"},
            {"rtx", "text/richtext"},
            {"sgm", "text/sgml"},
            {"sgml", "text/sgml"},
            {"sh", "application/x-sh"},
            {"shar", "application/x-shar"},
            {"silo", "model/mesh"},
            {"sit", "application/x-stuffit"},
            {"skd", "application/x-koan"},
            {"skm", "application/x-koan"},
            {"skp", "application/x-koan"},
            {"skt", "application/x-koan"},
            {"smi", "application/smil"},
            {"smil", "application/smil"},
            {"snd", "audio/basic"},
            {"so", "application/octet-stream"},
            {"spl", "application/x-futuresplash"},
            {"src", "application/x-wais-source"},
            {"sv4cpio", "application/x-sv4cpio"},
            {"sv4crc", "application/x-sv4crc"},
            {"svg", "image/svg+xml"},
            {"swf", "application/x-shockwave-flash"},
            {"t", "application/x-troff"},
            {"tar", "application/x-tar"},
            {"tcl", "application/x-tcl"},
            {"tex", "application/x-tex"},
            {"texi", "application/x-texinfo"},
            {"texinfo", "application/x-texinfo"},
            {"tif", "image/tiff"},
            {"tiff", "image/tiff"},
            {"tr", "application/x-troff"},
            {"tsv", "text/tab-separated-values"},
            {"txt", "text/plain"},
            {"ustar", "application/x-ustar"},
            {"vcd", "application/x-cdlink"},
            {"vrml", "model/vrml"},
            {"vxml", "application/voicexml+xml"},
            {"wav", "audio/x-wav"},
            {"wbmp", "image/vnd.wap.wbmp"},
            {"wbmxl", "application/vnd.wap.wbxml"},
            {"wml", "text/vnd.wap.wml"},
            {"wmlc", "application/vnd.wap.wmlc"},
            {"wmls", "text/vnd.wap.wmlscript"},
            {"wmlsc", "application/vnd.wap.wmlscriptc"},
            {"wrl", "model/vrml"},
            {"xbm", "image/x-xbitmap"},
            {"xht", "application/xhtml+xml"},
            {"xhtml", "application/xhtml+xml"},
            {"xls", "application/vnd.ms-excel"},                                                
            {"xml", "application/xml"},
            {"xpm", "image/x-xpixmap"},
            {"xsl", "application/xml"},
            {"xlsx","application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
            {"xltx","application/vnd.openxmlformats-officedocument.spreadsheetml.template"},
            {"xlsm","application/vnd.ms-excel.sheet.macroEnabled.12"},
            {"xltm","application/vnd.ms-excel.template.macroEnabled.12"},
            {"xlam","application/vnd.ms-excel.addin.macroEnabled.12"},
            {"xlsb","application/vnd.ms-excel.sheet.binary.macroEnabled.12"},
            {"xslt", "application/xslt+xml"},
            {"xul", "application/vnd.mozilla.xul+xml"},
            {"xwd", "image/x-xwindowdump"},
            {"xyz", "chemical/x-xyz"},
            {"zip", "application/zip"}
        };
    }
}

What is the difference between vmalloc and kmalloc?

Linux Kernel Development by Robert Love (Chapter 12, page 244 in 3rd edition) answers this very clearly.

Yes, physically contiguous memory is not required in many of the cases. Main reason for kmalloc being used more than vmalloc in kernel is performance. The book explains, when big memory chunks are allocated using vmalloc, kernel has to map the physically non-contiguous chunks (pages) into a single contiguous virtual memory region. Since the memory is virtually contiguous and physically non-contiguous, several virtual-to-physical address mappings will have to be added to the page table. And in the worst case, there will be (size of buffer/page size) number of mappings added to the page table.

This also adds pressure on TLB (the cache entries storing recent virtual to physical address mappings) when accessing this buffer. This can lead to thrashing.

How do I select the "last child" with a specific class name in CSS?

This can be done using an attribute selector.

[class~='list']:last-of-type  {
    background: #000;
}

The class~ selects a specific whole word. This allows your list item to have multiple classes if need be, in various order. It'll still find the exact class "list" and apply the style to the last one.

See a working example here: http://codepen.io/chasebank/pen/ZYyeab

The system cannot find the file specified in java

Try to list all files' names in the directory by calling:

File file = new File(".");
for(String fileNames : file.list()) System.out.println(fileNames);

and see if you will find your files in the list.

How do I detect if software keyboard is visible on Android Device or not?

This was much less complicated for the requirements I needed. Hope this might help:

On the MainActivity:

public void dismissKeyboard(){
    InputMethodManager imm =(InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(mSearchBox.getWindowToken(), 0);
    mKeyboardStatus = false;
}

public void showKeyboard(){
    InputMethodManager imm =(InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
    mKeyboardStatus = true;
}

private boolean isKeyboardActive(){
    return mKeyboardStatus;
}

The default primative boolean value for mKeyboardStatus will be initialized to false.

Then check the value as follows, and perform an action if necessary:

 mSearchBox.requestFocus();
    if(!isKeyboardActive()){
        showKeyboard();
    }else{
        dismissKeyboard();
    }

How to get complete month name from DateTime

You can use Culture to get month name for your country like:

System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo("ar-EG");
string FormatDate = DateTime.Now.ToString("dddd., MMM dd yyyy, hh:MM tt", culture);

Python list iterator behavior and next(iterator)

I find the existing answers a little confusing, because they only indirectly indicate the essential mystifying thing in the code example: both* the "print i" and the "next(a)" are causing their results to be printed.

Since they're printing alternating elements of the original sequence, and it's unexpected that the "next(a)" statement is printing, it appears as if the "print i" statement is printing all the values.

In that light, it becomes more clear that assigning the result of "next(a)" to a variable inhibits the printing of its' result, so that just the alternate values that the "i" loop variable are printed. Similarly, making the "print" statement emit something more distinctive disambiguates it, as well.

(One of the existing answers refutes the others because that answer is having the example code evaluated as a block, so that the interpreter is not reporting the intermediate values for "next(a)".)

The beguiling thing in answering questions, in general, is being explicit about what is obvious once you know the answer. It can be elusive. Likewise critiquing answers once you understand them. It's interesting...

Finding out the name of the original repository you cloned from in Git

Powershell version of command for git repo name:

(git config --get remote.origin.url) -replace '.*/' -replace '.git'

Unix ls command: show full path when using options

Use this command:

ls -ltr /mig/mthome/09/log/*

instead of:

ls -ltr /mig/mthome/09/log

to get the full path in the listing.

How to pass a variable to the SelectCommand of a SqlDataSource?

try with this.

Protected Sub SqlDataSource_Selecting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceSelectingEventArgs) Handles SqlDataSource.Selecting

    e.Command.CommandText = "SELECT [ImageID],[ImagePath] FROM [TblImage] where IsActive = 1"

    End Sub

Text was truncated or one or more characters had no match in the target code page including the primary key in an unpivot

Not really a technical solution, but SQL Server 2017 flat file import is totally revamped, and imported my large-ish file with 5 clicks, handled encoding / field length issues without any input from me

Optional query string parameters in ASP.NET Web API

if you want to pass multiple parameters then you can create model instead of passing multiple parameters.

in case you dont want to pass any parameter then you can skip as well in it, and your code will look neat and clean.

How can one pull the (private) data of one's own Android app?

If you are using a Mac machine and a Samsung phone, this is what you have to do (since run-as doesn't work on Samsung and zlib doesn't work on Mac)

Take a backup of your app's data directory adb backup -f /Users/username/Desktop/data.ab com.example
You will be asked for a password to encrypt in your Phone, don't enter any. Just tap on "Back up my data". See How to take BackUp?
Once successfully backed up, you will see data.ab file in your Desktop. Now we need to convert this to tar format.
Use Android Backup Extractor for this. Download | SourceCode
Download it and you will see abe.jar file. Add this to your PATH variable.
Execute this to generate the tar file: java -jar abe.jar unpack /Users/username/Desktop/data.ab /Users/username/Desktop/data.tar
Extract the data.tar file to access all the files

What is the difference between <p> and <div>?

A p tag is for a paragraph, generally used for text. A div tag is for division, and generally used for creating sections of text.

find -mtime files older than 1 hour

What about -mmin?

find /var/www/html/audio -daystart -maxdepth 1 -mmin +59 -type f -name "*.mp3" \
    -exec rm -f {} \;

From man find:

-mmin n
        File's data was last modified n minutes ago.

Also, make sure to test this first!

... -exec echo rm -f '{}' \;
          ^^^^ Add the 'echo' so you just see the commands that are going to get
               run instead of actual trying them first.

How to get the day name from a selected date?

I use this Extension Method:

public static string GetDayName(this DateTime date)
{
    string _ret = string.Empty; //Only for .NET Framework 4++
    var culture = new System.Globalization.CultureInfo("es-419"); //<- 'es-419' = Spanish (Latin America), 'en-US' = English (United States)
    _ret = culture.DateTimeFormat.GetDayName(date.DayOfWeek); //<- Get the Name     
    _ret = culture.TextInfo.ToTitleCase(_ret.ToLower()); //<- Convert to Capital title
    return _ret;
}

if condition in sql server update query

Since you're using SQL 2008:

UPDATE
    table_Name

SET
    column_A  
     = CASE
        WHEN @flag = '1' THEN @new_value
        ELSE 0
    END + column_A,

    column_B  
     = CASE
        WHEN @flag = '0' THEN @new_value
        ELSE 0
    END + column_B 
WHERE
    ID = @ID

If you were using SQL 2012:

UPDATE
    table_Name
SET
    column_A  = column_A + IIF(@flag = '1', @new_value, 0),
    column_B  = column_B + IIF(@flag = '0', @new_value, 0)
WHERE
    ID = @ID

Extract specific columns from delimited file using Awk

Others have answered your earlier question. For this:

As an addendum, is there any way to extract directly with the header names rather than with column numbers?

I haven't tried it, but you could store each header's index in a hash and then use that hash to get its index later on.

for(i=0;i<$NF;i++){
    hash[$i] = i;
}

Then later on, use it:

j = hash["header1"];
print $j;

Which programming language for cloud computing?

"Cloud computing" is more of an operating-system-level concept than a language concept.

Let's say you want to host an application on Amazon's EC2 cloud computing service -- you can develop it in any language you like, on any operating system supported by EC2 (several flavors of Linux, Solaris, and Windows), then install and run it "in the cloud" on one or more virtual machines, much as you would do on a dedicated physical server.

Open Jquery modal dialog on click event

Try this

    $(function() {

$('#clickMe').click(function(event) {
    var mytext = $('#myText').val();


    $('<div id="dialog">'+mytext+'</div>').appendTo('body');        
    event.preventDefault();

        $("#dialog").dialog({                   
            width: 600,
            modal: true,
            close: function(event, ui) {
                $("#dialog").remove();
                }
            });
    }); //close click
});

And in HTML

<h3 id="clickMe">Open dialog</h3>
<textarea cols="0" rows="0" id="myText" style="display:none">Some hidden text display none</textarea>

How to get DateTime.Now() in YYYY-MM-DDThh:mm:ssTZD format using C#

Use the zzz format specifier to get the timezone offset as hours and minutes. You also want to use the HH format specifier to get the hours in 24 hour format.

DateTime.Now.ToString("yyyy-MM-ddTHH:mm:sszzz")

Result:

2011-08-09T23:49:58+02:00

Some culture settings uses periods instead of colons for time, so you might want to use literal colons instead of time separators:

DateTime.Now.ToString("yyyy-MM-ddTHH':'mm':'sszzz")

Custom Date and Time Format Strings

Get href attribute on jQuery

Use $(this) for get the desire element.

function openAll()
{
     $("tr.b_row").each(function(){
        var a_href = $(this).find('.cpt h2 a').attr('href');
        alert ("Href is: "+a_href);
     });
}

Cannot get Kerberos service ticket: KrbException: Server not found in Kerberos database (7)

Consider adding

[appdefaults]
validate=false

to your /etc/krb5.conf. This can work around mismatching DNS.

Append values to a set in Python

keep.update((0,1,2,3,4,5,6,7,8,9,10))

keep.update(np.arange(11))

Android: How can I validate EditText input?

If you want nice validation popups and images when an error occurs you can use the setError method of the EditText class as I describe here

Screenshot of the use of setError taken from Donn Felker, the author of the linked post

Real time face detection OpenCV, Python

Your line:

img = cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)

will draw a rectangle in the image, but the return value will be None, so img changes to None and cannot be drawn.

Try

cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)

Excel tab sheet names vs. Visual Basic sheet names

This will change all worksheet objects' names (from the perspective of the VBA editor) to match that of their sheet names (from the perspective of Excel):

Sub ZZ_Reset_Sheet_CodeNames()
'Changes the internal object name (codename) of each sheet to it's conventional name (based on it's sheet name)

    Dim varItem As Variant

    For Each varItem In ThisWorkbook.VBProject.VBComponents
        'Type 100 is a worksheet
        If varItem.Type = 100 And varItem.Name <> "ThisWorkbook" Then
            varItem.Name = varItem.Properties("Name").Value
        End If
    Next
End Sub

It is important to note that the object name (codename) "(Name)" is being overridden by the property name "Name", and so it must be referenced as a sub-property.

How to style dt and dd so they are on the same line?

If you use Bootstrap 3 (or earlier)...

<dl class="dl-horizontal">
    <dt>Label:</dt>
    <dd>
      Description of planet
    </dd>
    <dt>Label2:</dt>
    <dd>
      Description of planet
    </dd>
</dl>

How to style a disabled checkbox?

Use the :disabled CSS3 pseudo-selector

HTML table with fixed headers and a fixed column?

The jQuery DataTables plug-in is one excellent way to achieve excel-like fixed column(s) and headers.

Note the examples section of the site and the "extras".
http://datatables.net/examples/
http://datatables.net/extras/

The "Extras" section has tools for fixed columns and fixed headers.

Fixed Columns
http://datatables.net/extras/fixedcolumns/
(I believe the example on this page is the one most appropriate for your question.)

Fixed Header
http://datatables.net/extras/fixedheader/
(Includes an example with a full page spreadsheet style layout: http://datatables.net/release-datatables/extras/FixedHeader/top_bottom_left_right.html)

Is there way to use two PHP versions in XAMPP?

I would recommend using Docker, this allows you to split the environment into various components and mix and match the ones you want at any time.

Docker will allow you to run one container with MySQL, another with PHP. As they are separate images you can have two containers, one PHP 5 another PHP 7, you start up which ever one you wish and port 80 can be mapped to both containers.

https://hub.docker.com has a wide range of preconfigured images which you can install and run without much hassle.

I've also added portainer as an image, which allows you to manage the various aspects of your docker setup - from within a docker image (I did start this container on startup to save me having to use the command line). It doesn't do everything for you and sometimes it's easier to configure and launch the images for the first time from the command line, but once setup you can start and stop them through a web interface.

It's also possible to run both containers at the same time and map separate ports to each. So port 80 can be mapped to PHP 5 and 81 to PHP 81 (Or PHP 7 if your watching this in 2017).

There are various tutorials on how to install Docker( https://docs.docker.com/engine/installation/) and loads of other 'how to' type things. Try http://www.masterzendframework.com/docker-development-environment/ for a development environment configuration.

Can I add background color only for padding?

You can do a div over the padding as follows:

<div id= "paddingOne">
</div>
<div id= "paddingTwo">
</div>

#paddingOne {
width: 100;
length: 100;
background-color: #000000;
margin: 0;
z-index: 2;
}
#paddingTwo {
width: 200;
length: 200;
background-color: #ffffff;
margin: 0;
z-index: 3;

the width, length, background color, margins, and z-index can vary of course, but in order to cover the padding, the z-index must be higher than 0 so that it will lay over the padding. You can fiddle with positioning and such to change its orientation. Hope that helps!

P.S. the divs are html and the #paddingOne and #paddingTwo are css (in case anyone didn't get that:)

How can I know if Object is String type object?

From JDK 14+ which includes JEP 305 we can do Pattern Matching for instanceof

Patterns basically test that a value has a certain type, and can extract information from the value when it has the matching type.

Before Java 14

if (obj instanceof String) {
    String str = (String) obj; // need to declare and cast again the object
    .. str.contains(..) ..
}else{
     str = ....
}

Java 14 enhancements

if (!(obj instanceof String str)) {
    .. str.contains(..) .. // no need to declare str object again with casting
} else {
    .. str....
}

We can also combine the type check and other conditions together

if (obj instanceof String str && str.length() > 4) {.. str.contains(..) ..}

The use of pattern matching in instanceof should reduce the overall number of explicit casts in Java programs.

PS: instanceOf will only match when the object is not null, then only it can be assigned to str.

Getting and removing the first character of a string

There is also str_sub from the stringr package

x <- 'hello stackoverflow'
str_sub(x, 2) # or
str_sub(x, 2, str_length(x))
[1] "ello stackoverflow"

Java NIO: What does IOException: Broken pipe mean?

What causes a "broken pipe", and more importantly, is it possible to recover from that state?

It is caused by something causing the connection to close. (It is not your application that closed the connection: that would have resulted in a different exception.)

It is not possible to recover the connection. You need to open a new one.

If it cannot be recovered, it seems this would be a good sign that an irreversible problem has occurred and that I should simply close this socket connection. Is that a reasonable assumption?

Yes it is. Once you've received that exception, the socket won't ever work again. Closing it is is the only sensible thing to do.

Is there ever a time when this IOException would occur while the socket connection is still being properly connected in the first place (rather than a working connection that failed at some point)?

No. (Or at least, not without subverting proper behavior of the OS'es network stack, the JVM and/or your application.)

Is it wise to always call SocketChannel.isConnected() before attempting a SocketChannel.write() ...

In general, it is a bad idea to call r.isXYZ() before some call that uses the (external) resource r. There is a small chance that the state of the resource will change between the two calls. It is a better idea to do the action, catch the IOException (or whatever) resulting from the failed action and take whatever remedial action is required.

In this particular case, calling isConnected() is pointless. The method is defined to return true if the socket was connected at some point in the past. It does not tell you if the connection is still live. The only way to determine if the connection is still alive is to attempt to use it; e.g. do a read or write.

Select multiple images from android gallery

Initialize instance:

private String imagePath;
private List<String> imagePathList;

In onActivityResult You have to write this, If-else 2 block. One for single image and another for multiple image.

if (requestCode == GALLERY_CODE && resultCode == RESULT_OK  && data != null){

    imagePathList = new ArrayList<>();

    if(data.getClipData() != null){

        int count = data.getClipData().getItemCount();
        for (int i=0; i<count; i++){

            Uri imageUri = data.getClipData().getItemAt(i).getUri();
            getImageFilePath(imageUri);
        }
    }
    else if(data.getData() != null){

        Uri imgUri = data.getData();
        getImageFilePath(imgUri);
    }
}

Most important part, Get Image Path from uri:

public void getImageFilePath(Uri uri) {

    File file = new File(uri.getPath());
    String[] filePath = file.getPath().split(":");
    String image_id = filePath[filePath.length - 1];

    Cursor cursor = getContentResolver().query(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, MediaStore.Images.Media._ID + " = ? ", new String[]{image_id}, null);
    if (cursor!=null) {
        cursor.moveToFirst();
        imagePath = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
        imagePathList.add(imagePath);
        cursor.close();
    }
}

Hope this can help you.

What is the format for the PostgreSQL connection string / URL?

If you use Libpq binding for respective language, according to its documentation URI is formed as follows:

postgresql://[user[:password]@][netloc][:port][/dbname][?param1=value1&...]

Here are examples from same document

postgresql://
postgresql://localhost
postgresql://localhost:5432
postgresql://localhost/mydb
postgresql://user@localhost
postgresql://user:secret@localhost
postgresql://other@localhost/otherdb?connect_timeout=10&application_name=myapp
postgresql://localhost/mydb?user=other&password=secret

Docker expose all ports or range of ports from 7000 to 8000

Since Docker 1.5 you can now expose a range of ports to other linked containers using:

The Dockerfile EXPOSE command:

EXPOSE 7000-8000

or The Docker run command:

docker run --expose=7000-8000

Or instead you can publish a range of ports to the host machine via Docker run command:

docker run -p 7000-8000:7000-8000

How do I tidy up an HTML file's indentation in VI?

None of the answers worked for me because all my HTML was in a single line.

Basically you need first to break each line with the following command that substitutes >< with the same characters but with a line break in the middle.

:%s/></>\r</g

Then the command

gg=G

will indent the file.

Making a flex item float right

You don't need floats. In fact, they're useless because floats are ignored in flexbox.

You also don't need CSS positioning.

There are several flex methods available. auto margins have been mentioned in another answer.

Here are two other options:

Use justify-content: space-between and the order property.
Use justify-content: space-between and reverse the order of the divs.

_x000D_

.parent {_x000D_
    display: flex;_x000D_
    justify-content: space-between;_x000D_
}_x000D_
_x000D_
.parent:first-of-type > div:last-child { order: -1; }_x000D_
_x000D_
p { background-color: #ddd;}

_x000D_

<p>Method 1: Use <code>justify-content: space-between</code> and <code>order-1</code></p>_x000D_
_x000D_
<div class="parent">_x000D_
    <div class="child" style="float:right"> Ignore parent? </div>_x000D_
    <div>another child </div>_x000D_
</div>_x000D_
_x000D_
<hr>_x000D_
_x000D_
<p>Method 2: Use <code>justify-content: space-between</code> and reverse the order of _x000D_
             divs in the mark-up</p>_x000D_
_x000D_
<div class="parent">_x000D_
    <div>another child </div>_x000D_
    <div class="child" style="float:right"> Ignore parent? </div>_x000D_
</div>

_x000D_

Is there an easy way to strike through text in an app widget?

2015 Update: Folks, this is for very old versions of Android. See other answers for modern solutions!

To strike through the entire text view, you can use a specific background image to simulate the strikethrough effect:

android:background="@drawable/bg_strikethrough"

Where the bg_strikethrough drawable is a 9-patch that keeps a solid line through the middle, growing either side, with however much padding you think is reasonable. I've used one like this:

(enlarged for clarity.. 1300% !)

That is my HDPI version, so save it (the first one http://i.stack.imgur.com/nt6BK.png) as res/drawable-hdpi/bg_strikethrough.9.png and the configuration will work as so:

Want to download a Git repository, what do I need (windows machine)?

Install mysysgit. (Same as Greg Hewgill's answer.)

Install Tortoisegit. (Tortoisegit requires mysysgit or something similiar like Cygwin.)

After TortoiseGit is installed, right-click on a folder, select Git Clone..., then enter the Url of the repository, then click Ok.

This answer is not any better than just installing mysysgit, but you can avoid the dreaded command line. :)

How to concatenate strings of a string field in a PostgreSQL 'group by' query?

You can also use format function. Which can also implicitly take care of type conversion of text, int, etc by itself.

create or replace function concat_return_row_count(tbl_name text, column_name text, value int)
returns integer as $row_count$
declare
total integer;
begin
    EXECUTE format('select count(*) from %s WHERE %s = %s', tbl_name, column_name, value) INTO total;
    return total;
end;
$row_count$ language plpgsql;


postgres=# select concat_return_row_count('tbl_name','column_name',2); --2 is the value

Python 3 TypeError: must be str, not bytes with sys.stdout.write()

Python 3 handles strings a bit different. Originally there was just one type for strings: str. When unicode gained traction in the '90s the new unicode type was added to handle Unicode without breaking pre-existing code¹. This is effectively the same as str but with multibyte support.

In Python 3 there are two different types:

The bytes type. This is just a sequence of bytes, Python doesn't know anything about how to interpret this as characters.
The str type. This is also a sequence of bytes, but Python knows how to interpret those bytes as characters.
The separate unicode type was dropped. str now supports unicode.

In Python 2 implicitly assuming an encoding could cause a lot of problems; you could end up using the wrong encoding, or the data may not have an encoding at all (e.g. it’s a PNG image).
Explicitly telling Python which encoding to use (or explicitly telling it to guess) is often a lot better and much more in line with the "Python philosophy" of "explicit is better than implicit".

This change is incompatible with Python 2 as many return values have changed, leading to subtle problems like this one; it's probably the main reason why Python 3 adoption has been so slow. Since Python doesn't have static typing² it's impossible to change this automatically with a script (such as the bundled 2to3).

You can convert str to bytes with bytes('h€llo', 'utf-8'); this should produce b'H\xe2\x82\xacllo'. Note how one character was converted to three bytes.
You can convert bytes to str with b'H\xe2\x82\xacllo'.decode('utf-8').

Of course, UTF-8 may not be the correct character set in your case, so be sure to use the correct one.

In your specific piece of code, nextline is of type bytes, not str, reading stdout and stdin from subprocess changed in Python 3 from str to bytes. This is because Python can't be sure which encoding this uses. It probably uses the same as sys.stdin.encoding (the encoding of your system), but it can't be sure.

You need to replace:

sys.stdout.write(nextline)

with:

sys.stdout.write(nextline.decode('utf-8'))

or maybe:

sys.stdout.write(nextline.decode(sys.stdout.encoding))

You will also need to modify if nextline == '' to if nextline == b'' since:

>>> '' == b''
False

Also see the Python 3 ChangeLog, PEP 358, and PEP 3112.

¹ There are some neat tricks you can do with ASCII that you can't do with multibyte character sets; the most famous example is the "xor with space to switch case" (e.g. chr(ord('a') ^ ord(' ')) == 'A') and "set 6th bit to make a control character" (e.g. ord('\t') + ord('@') == ord('I')). ASCII was designed in a time when manipulating individual bits was an operation with a non-negligible performance impact.

² Yes, you can use function annotations, but it's a comparatively new feature and little used.

Export database schema into SQL file

enter image description here

In the picture you can see. In the set script options, choose the last option: Types of data to script you click at the right side and you choose what you want. This is the option you should choose to export a schema and data

What's the difference between a method and a function?

A function is a piece of code that is called by name. It can be passed data to operate on (i.e. the parameters) and can optionally return data (the return value). All data that is passed to a function is explicitly passed.

A method is a piece of code that is called by a name that is associated with an object. In most respects it is identical to a function except for two key differences:

A method is implicitly passed the object on which it was called.
A method is able to operate on data that is contained within the class (remembering that an object is an instance of a class - the class is the definition, the object is an instance of that data).

(this is a simplified explanation, ignoring issues of scope etc.)

JavaScript: Upload file

Unless you're trying to upload the file using ajax, just submit the form to /upload/image.

<form enctype="multipart/form-data" action="/upload/image" method="post">
    <input id="image-file" type="file" />
</form>

If you do want to upload the image in the background (e.g. without submitting the whole form), you can use ajax:

Show "Open File" Dialog

My comments on Renaud Bompuis's answer messed up.

Actually, you can use late binding, and the reference to the 11.0 object library is not required.

The following code will work without any references:

 Dim f    As Object 
 Set f = Application.FileDialog(3) 
 f.AllowMultiSelect = True 
 f.Show 

 MsgBox "file choosen = " & f.SelectedItems.Count

Note that the above works well in the runtime also.

css with background image without repeating the image

Instead of

background-repeat-x: no-repeat;
background-repeat-y: no-repeat;

which is not correct, use

background-repeat: no-repeat;

changing textbox border colour using javascript

You may try

document.getElementById('name').style.borderColor='#e52213';
document.getElementById('name').style.border='solid';

How to validate inputs dynamically created using ng-repeat, ng-show (angular)

It is possible and here is how I do the same thing with a table of inputs.

wrap the table in a form like so

Then just use this

I have a form with multi-nested directives that all contain input(s), select(s), etc... These elements are all enclosed in ng-repeats, and dynamic string values.

This is how to use the directive:

<form name="myFormName">
  <nested directives of many levels>
    <your table here>
    <perhaps a td here>
    ex: <input ng-repeat=(index, variable) in variables" type="text"
               my-name="{{ variable.name + '/' + 'myFormName' }}"
               ng-model="variable.name" required />
    ex: <select ng-model="variable.name" ng-options="label in label in {{ variable.options }}"
                my-name="{{ variable.name + index + '/' + 'myFormName' }}"
        </select>
</form>

Note: you can add and index to the string concatenation if you need to serialize perhaps a table of inputs; which is what I did.

app.directive('myName', function(){

  var myNameError = "myName directive error: "

  return {
    restrict:'A', // Declares an Attributes Directive.
    require: 'ngModel', // ngModelController.

    link: function( scope, elem, attrs, ngModel ){
      if( !ngModel ){ return } // no ngModel exists for this element

      // check myName input for proper formatting ex. something/something
      checkInputFormat(attrs);

      var inputName = attrs.myName.match('^\\w+').pop(); // match upto '/'
      assignInputNameToInputModel(inputName, ngModel);

      var formName = attrs.myName.match('\\w+$').pop(); // match after '/'
      findForm(formName, ngModel, scope);
    } // end link
  } // end return

  function checkInputFormat(attrs){
    if( !/\w\/\w/.test(attrs.rsName )){
      throw myNameError + "Formatting should be \"inputName/formName\" but is " + attrs.rsName
    }
  }

  function assignInputNameToInputModel(inputName, ngModel){
    ngModel.$name = inputName
  }

  function addInputNameToForm(formName, ngModel, scope){
    scope[formName][ngModel.$name] = ngModel; return
  }

  function findForm(formName, ngModel, scope){
    if( !scope ){ // ran out of scope before finding scope[formName]
      throw myNameError + "<Form> element named " + formName + " could not be found."
    }

    if( formName in scope){ // found scope[formName]
      addInputNameToForm(formName, ngModel, scope)
      return
    }
    findForm(formName, ngModel, scope.$parent) // recursively search through $parent scopes
  }
});

This should handle many situations where you just don't know where the form will be. Or perhaps you have nested forms, but for some reason you want to attach this input name to two forms up? Well, just pass in the form name you want to attach the input name to.

What I wanted, was a way to assign dynamic values to inputs that I will never know, and then just call $scope.myFormName.$valid.

You can add anything else you wish: more tables more form inputs, nested forms, whatever you want. Just pass the form name you want to validate the inputs against. Then on form submit ask if the $scope.yourFormName.$valid

Pandas count(distinct) equivalent

Interestingly enough, very often len(unique()) is a few times (3x-15x) faster than nunique().

Reinitialize Slick js after successful ajax call

I was facing an issue where Slick carousel wasn't refreshing on new data, it was appending new slides to previous ones, I found an answer which solved my problem, it's very simple.

try unslick, then assign your new data which is being rendered inside slick carousel, and then initialize slick again. these were the steps for me:

jQuery('.class-or-#id').slick('unslick');
myData = my-new-data;
jQuery('.class-or-#id').slick({slick options});

Note: check slick website for syntax just in case. also make sure you are not using unslick before slick is even initialized, what that means is simply initialize (like this jquery('.my-class').slick({options}); the first ajax call and once it is initialized then follow above steps, you may wanna use if else

Bootstrap 4 Change Hamburger Toggler Color

Use a font-awesome icon as the default icon of your navbar.

<span class="navbar-toggler-icon">   
    <i class="fas fa-bars" style="color:#fff; font-size:28px;"></i>
</span>

Or try this on old font-awesome versions:

<span class="navbar-toggler-icon">   
    <i class="fa fa-navicon" style="color:#fff; font-size:28px;"></i>
</span>

How to declare a global variable in React?

You can use mixins in react https://facebook.github.io/react/docs/reusable-components.html#mixins .

How to remove/delete a large file from commit history in Git repository?

(The best answer I've seen to this problem is: https://stackoverflow.com/a/42544963/714112 , copied here since this thread appears high in Google search rankings but that other one doesn't)

A blazingly fast shell one-liner

This shell script displays all blob objects in the repository, sorted from smallest to largest.

For my sample repo, it ran about 100 times faster than the other ones found here.
On my trusty Athlon II X4 system, it handles the Linux Kernel repository with its 5,622,155 objects in just over a minute.

The Base Script

git rev-list --objects --all \
| git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' \
| awk '/^blob/ {print substr($0,6)}' \
| sort --numeric-sort --key=2 \
| cut --complement --characters=13-40 \
| numfmt --field=2 --to=iec-i --suffix=B --padding=7 --round=nearest

When you run above code, you will get nice human-readable output like this:

...
0d99bb931299  530KiB path/to/some-image.jpg
2ba44098e28f   12MiB path/to/hires-image.png
bd1741ddce0d   63MiB path/to/some-video-1080p.mp4

Fast File Removal

Suppose you then want to remove the files a and b from every commit reachable from HEAD, you can use this command:

git filter-branch --index-filter 'git rm --cached --ignore-unmatch a b' HEAD

How to create own dynamic type or dynamic object in C#?

ExpandoObject is what are you looking for.

dynamic MyDynamic = new ExpandoObject(); // note, the type MUST be dynamic to use dynamic invoking.
MyDynamic.A = "A";
MyDynamic.B = "B";
MyDynamic.C = "C";
MyDynamic.TheAnswerToLifeTheUniverseAndEverything = 42;

How to avoid the "Circular view path" exception with Spring MVC test

I am using Spring Boot with Thymeleaf. This is what worked for me. There are similar answers with JSP but note that I am using HTML, not JSP, and these are in the folder src/main/resources/templates like in a standard Spring Boot project as explained here. This could also be your case.

@InjectMocks
private MyController myController;

@Before
public void setup()
{
    MockitoAnnotations.initMocks(this);

    this.mockMvc = MockMvcBuilders.standaloneSetup(myController)
                    .setViewResolvers(viewResolver())
                    .build();
}

private ViewResolver viewResolver()
{
    InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();

    viewResolver.setPrefix("classpath:templates/");
    viewResolver.setSuffix(".html");

    return viewResolver;
}

Hope this helps.

Pandas join issue: columns overlap but no suffix specified

The .join() function is using the index of the passed as argument dataset, so you should use set_index or use .merge function instead.

Please find the two examples that should work in your case:

join_df = LS_sgo.join(MSU_pi.set_index('mukey'), on='mukey', how='left')

join_df = df_a.merge(df_b, on='mukey', how='left')

How do I correctly clone a JavaScript object?

Interested in cloning simple objects:

JSON.parse(JSON.stringify(json_original));

Source : How to copy JavaScript object to new variable NOT by reference?

How do I check two or more conditions in one <c:if>?

Recommendation:

when you have more than one condition with and and or is better separate with () to avoid verification problems

<c:if test="${(not validID) and (addressIso == 'US' or addressIso == 'BR')}">

How to focus on a form input text field on page load using jQuery?

Think about your user interface before you do this. I assume (though none of the answers has said so) that you'll be doing this when the document loads using jQuery's ready() function. If a user has already focussed on a different element before the document has loaded (which is perfectly possible) then it's extremely irritating for them to have the focus stolen away.

You could check for this by adding onfocus attributes in each of your <input> elements to record whether the user has already focussed on a form field and then not stealing the focus if they have:

var anyFieldReceivedFocus = false;

function fieldReceivedFocus() {
    anyFieldReceivedFocus = true;
}

function focusFirstField() {
    if (!anyFieldReceivedFocus) {
        // Do jQuery focus stuff
    }
}


<input type="text" onfocus="fieldReceivedFocus()" name="one">
<input type="text" onfocus="fieldReceivedFocus()" name="two">

Can I use DIV class and ID together in CSS?

Of course you can.

Your HTML there is just fine. To style the elements with css you can use the following approaches:

#y {
    ...
}

.x {
    ...
}

#y.x {
    ...
}

Also you can add as many classes as you wish to your element

<div id="id" class="classA classB classC ...">
</div>

And you can style that element using a selector with any combination of the classes and id. For example:

#id.classA.classB.classC {
     ...
}

#id.classC {
}

Restart android machine

You can reboot the device by sending the following broadcast:

$ adb shell am broadcast -a android.intent.action.BOOT_COMPLETED

Is it possible to get an Excel document's row count without loading the entire document into memory?

The solution suggested in this answer has been deprecated, and might no longer work.

Taking a look at the source code of OpenPyXL (IterableWorksheet) I've figured out how to get the column and row count from an iterator worksheet:

wb = load_workbook(path, use_iterators=True)
sheet = wb.worksheets[0]

row_count = sheet.get_highest_row() - 1
column_count = letter_to_index(sheet.get_highest_column()) + 1

IterableWorksheet.get_highest_column returns a string with the column letter that you can see in Excel, e.g. "A", "B", "C" etc. Therefore I've also written a function to translate the column letter to a zero based index:

def letter_to_index(letter):
    """Converts a column letter, e.g. "A", "B", "AA", "BC" etc. to a zero based
    column index.

    A becomes 0, B becomes 1, Z becomes 25, AA becomes 26 etc.

    Args:
        letter (str): The column index letter.
    Returns:
        The column index as an integer.
    """
    letter = letter.upper()
    result = 0

    for index, char in enumerate(reversed(letter)):
        # Get the ASCII number of the letter and subtract 64 so that A
        # corresponds to 1.
        num = ord(char) - 64

        # Multiply the number with 26 to the power of `index` to get the correct
        # value of the letter based on it's index in the string.
        final_num = (26 ** index) * num

        result += final_num

    # Subtract 1 from the result to make it zero-based before returning.
    return result - 1

I still haven't figured out how to get the column sizes though, so I've decided to use a fixed-width font and automatically scaled columns in my application.

Get controller and action name from within controller?

string actionName = this.ControllerContext.RouteData.Values["action"].ToString();
string controllerName = this.ControllerContext.RouteData.Values["controller"].ToString();

javascript if number greater than number

You can "cast" to number using the Number constructor..

var number = new Number("8"); // 8 number

You can also call parseInt builtin function:

var number = parseInt("153"); // 153 number

How to convert int to char with leading zeros?

    select right('000' + convert(varchar(3),id),3) from table

    example
    declare @i int
    select @i =1

select right('000' + convert(varchar(3),@i),3)

BTW if it is an int column then it will still not keep the zeros Just do it in the presentation layer or if you really need to in the SELECT

SQL - How to find the highest number in a column?

If you're talking MS SQL, here's the most efficient way. This retrieves the current identity seed from a table based on whatever column is the identity.

select IDENT_CURRENT('TableName') as LastIdentity

Using MAX(id) is more generic, but for example I have an table with 400 million rows that takes 2 minutes to get the MAX(id). IDENT_CURRENT is nearly instantaneous...

ERROR Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies

check below link in which you can download suitable AjaxControlToolkit which suits your .NET version.

http://ajaxcontroltoolkit.codeplex.com/releases/view/43475

AjaxControlToolkit.Binary.NET4.zip - used for .NET 4.0

AjaxControlToolkit.Binary.NET35.zip - used for .NET 3.5

How to get Url Hash (#) from server side

Probably the only choice is to read it on the client side and transfer it manually to the server (GET/POST/AJAX). Regards Artur

You may see also how to play with back button and browser history at Malcan

How do I concatenate strings in Swift?

In Swift 5 apple has introduces Raw Strings using # symbols.

Example:

print(#"My name is "XXX" and I'm "28"."#)
let name = "XXX"
print(#"My name is \#(name)."#)

symbol # is necessary after \. A regular \(name) will be interpreted as characters in the string.

Where does System.Diagnostics.Debug.Write output appear?

The solution for my case is:

Right click the output window;
Check the 'Program Output'

%i or %d to print integer in C using printf()?

%d seems to be the norm for printing integers, I never figured out why, they behave identically.

How do I pass variables and data from PHP to JavaScript?

Try this:

<?php
    echo "<script> var x = " . json_encode($phpVariable) . "</script>";
?>

-After trying this for a while

Although it works, however it slows down the performance. As PHP is a server-side script while JavaScript is a user side.

Paste a multi-line Java String in Eclipse

If your building that SQL in a tool like TOAD or other SQL oriented IDE they often have copy markup to the clipboard. For example, TOAD has a CTRL+M which takes the SQL in your editor and does exactly what you have in your code above. It also covers the reverse... when your grabbing a formatted string out of your Java and want to execute it in TOAD. Pasting the SQL back into TOAD and perform a CTRL+P to remove the multi-line quotes.

Determining Referer in PHP

We have only single option left after reading all the fake referrer problems: i.e. The page we desire to track as referrer should be kept in session, and as ajax called then checking in session if it has referrer page value and doing the action other wise no action.

While on the other hand as he request any different page then make the referrer session value to null.

Remember that session variable is set on desire page request only.

How to exclude a directory from ant fileset, based on directories contents

Answer provided by user mgaert works for me. I think it should be marked as the right answer.

It works also with complex selectors like in this example:

<!-- 
    selects only direct subdirectories of ${targetdir} if they have a
    sub-subdirectory named either sub1 or sub2
-->
<dirset dir="${targetdir}" >
    <and>
        <depth max="0"/>
        <or>
            <present targetdir="${targetdir}">
                <globmapper from="*" to="*/sub1" />
            </present>
            <present targetdir="${targetdir}">
                <globmapper from="*" to="*/sub2" />
            </present>
        </or>
    </and>
</dirset>

Thus, having a directory structure like this:

targetdir
+-- bar
¦   +-- sub3
+-- baz
¦   +-- sub1
+-- foo
¦   +-- sub2
+-- phoo
¦   +-- sub1
¦   +-- sub2
+-- qux
    +-- xyzzy
        +-- sub1

the above dirset would contain only

baz foo phoo

(bar doesn't match because of sub3 while xyzzy doesn't match because it's not a direct subdirectory of targetdir)

C# Parsing JSON array of objects

I have just got an solution a little bit easier do get an list out of an JSON object. Hope this can help.

I got an JSON like this:

{"Accounts":"[{\"bank\":\"Itau\",\"account\":\"456\",\"agency\":\"0444\",\"digit\":\"5\"}]"}

And made some types like this

    public class FinancialData
{
    public string Accounts { get; set; } // this will store the JSON string
    public List<Accounts> AccountsList { get; set; } // this will be the actually list. 
}

    public class Accounts
{
    public string bank { get; set; }
    public string account { get; set; }
    public string agency { get; set; }
    public string digit { get; set; }

}

and the "magic" part

 Models.FinancialData financialData = (Models.FinancialData)JsonConvert.DeserializeObject(myJSON,typeof(Models.FinancialData));
        var accounts = JsonConvert.DeserializeObject(financialData.Accounts) as JArray;

        foreach (var account in  accounts)
        {
            if (financialData.AccountsList == null)
            {
                financialData.AccountsList = new List<Models.Accounts>();
            }

            financialData.AccountsList.Add(JsonConvert.DeserializeObject<Models.Accounts>(account.ToString()));
        }

Could not find default endpoint element

If you reference the web service in your class library then you have to copy app.config to your windows application or console application

solution: change Configuration of outer project same the class library's wcf configuration.

Worked for me

Adding additional data to select options using jQuery

I made two examples from what I think your question might be:

http://jsfiddle.net/grdn4/

Check this out for storing additional values. It uses data attributes to store the other value:

http://jsfiddle.net/27qJP/1/

Using getopts to process long and short command line options

The built-in getopts command is still, AFAIK, limited to single-character options only.

There is (or used to be) an external program getopt that would reorganize a set of options such that it was easier to parse. You could adapt that design to handle long options too. Example usage:

aflag=no
bflag=no
flist=""
set -- $(getopt abf: "$@")
while [ $# -gt 0 ]
do
    case "$1" in
    (-a) aflag=yes;;
    (-b) bflag=yes;;
    (-f) flist="$flist $2"; shift;;
    (--) shift; break;;
    (-*) echo "$0: error - unrecognized option $1" 1>&2; exit 1;;
    (*)  break;;
    esac
    shift
done

# Process remaining non-option arguments
...

You could use a similar scheme with a getoptlong command.

Note that the fundamental weakness with the external getopt program is the difficulty of handling arguments with spaces in them, and in preserving those spaces accurately. This is why the built-in getopts is superior, albeit limited by the fact it only handles single-letter options.

How to disable text selection using jQuery?

1 line solution for CHROME:

body.style.webkitUserSelect = "none";

and FF:

body.style.MozUserSelect = "none";

IE requires setting the "unselectable" attribute (details on bottom).

I tested this in Chrome and it works. This property is inherited so setting it on the body element will disable selection in your entire document.

Details here: http://help.dottoro.com/ljrlukea.php

If you're using Closure, just call this function:

goog.style.setUnselectable(myElement, true);

It handles all browsers transparently.

The non-IE browsers are handled like this:

goog.style.unselectableStyle_ =
    goog.userAgent.GECKO ? 'MozUserSelect' :
    goog.userAgent.WEBKIT ? 'WebkitUserSelect' :
    null;

Defined here: http://closure-library.googlecode.com/svn/!svn/bc/4/trunk/closure/goog/docs/closure_goog_style_style.js.source.html

The IE portion is handled like this:

if (goog.userAgent.IE || goog.userAgent.OPERA) {
// Toggle the 'unselectable' attribute on the element and its descendants.
var value = unselectable ? 'on' : '';
el.setAttribute('unselectable', value);
if (descendants) {
  for (var i = 0, descendant; descendant = descendants[i]; i++) {
    descendant.setAttribute('unselectable', value);
  }
}

Error "File google-services.json is missing from module root folder. The Google Services Plugin cannot function without it"

I received this error while trying to run Google's Firebase analytics sample app:

Prerequisites:

Download https://github.com/firebase/quickstart-android
Add quickstart/analytics to Android Studio

Add Procedure:

Go to https://firebase.google.com/
Click on "GO TO CONSOLE"
Click on "Add Project"
Project name: Enter: sample-app
Click "Create Project" [Takes about 10 seconds or so...]
Click "Continue"
On the "Getting Started" page, click "Add Firebase to your Android app"
Enter package name for the android app [The full package name appears at the top of the manifest: "com.google.firebase.quickstart.analytics"]
Click on download google-services.json
In file explorer, add google-services.json to the directory: "quickstart/analytics/app" [Warning: Do not rename the file, it must be: google-services.json]
Run 'app'
- The sample app already contains the necessary Gradle file settings.
- When adding a new project do: Tools -> Firebase -> Analytics -> Add Event -> Connect App to Firebase.
- Adding a project via Android Studio ensures that all the Gradle Dependecies are setup.

Remove Procedure:

Go to https://firebase.google.com/
Click on "GO TO CONSOLE"
Settings -> Project Settings -> Delete this App
Settings -> Project Settings -> Delete Project
Enter project ID and press delete

I added and removed the sample app multiple times without any noticeable side effects.

Pass Javascript variable to PHP via ajax

Pass the data like this to the ajax call (http://api.jquery.com/jQuery.ajax/):

data: { userID : userID }

And in your PHP do this:

if(isset($_POST['userID']))
{
    $uid = $_POST['userID'];

    // Do whatever you want with the $uid
}

isset() function's purpose is to check wheter the given variable exists, not to get its value.

Removing single-quote from a string in php

You can substitute in HTML entitiy:

$FileName = preg_replace("/'/", "\&#39;", $UserInput);

Proxies with Python 'Requests' module

I have found that urllib has some really good code to pick up the system's proxy settings and they happen to be in the correct form to use directly. You can use this like:

import urllib

...
r = requests.get('http://example.org', proxies=urllib.request.getproxies())

It works really well and urllib knows about getting Mac OS X and Windows settings as well.

Windows CMD command for accessing usb?

You can access the USB drive by its drive letter. To know the drive letter you can run this command:

C:\>wmic logicaldisk where drivetype=2 get deviceid, volumename, description

From here you will get the drive letter (Device ID) of your USB drive.

For example if its F: then run the following command in command prompt to see its contents:

C:\> F:

F:\> dir

Saving a Numpy array as an image

Imageio is a Python library that provides an easy interface to read and write a wide range of image data, including animated images, video, volumetric data, and scientific formats. It is cross-platform, runs on Python 2.7 and 3.4+, and is easy to install.

This is example for grayscale image:

import numpy as np
import imageio

# data is numpy array with grayscale value for each pixel.
data = np.array([70,80,82,72,58,58,60,63,54,58,60,48,89,115,121,119])

# 16 pixels can be converted into square of 4x4 or 2x8 or 8x2
data = data.reshape((4, 4)).astype('uint8')

# save image
imageio.imwrite('pic.jpg', data)

Remove all of x axis labels in ggplot

You have to set to element_blank() in theme() elements you need to remove

ggplot(data = diamonds, mapping = aes(x = clarity)) + geom_bar(aes(fill = cut))+
  theme(axis.title.x=element_blank(),
        axis.text.x=element_blank(),
        axis.ticks.x=element_blank())

HTTP get with headers using RestTemplate

Take a look at the JavaDoc for RestTemplate.

There is the corresponding getForObject methods that are the HTTP GET equivalents of postForObject, but they doesn't appear to fulfil your requirements of "GET with headers", as there is no way to specify headers on any of the calls.

Looking at the JavaDoc, no method that is HTTP GET specific allows you to also provide header information. There are alternatives though, one of which you have found and are using. The exchange methods allow you to provide an HttpEntity object representing the details of the request (including headers). The execute methods allow you to specify a RequestCallback from which you can add the headers upon its invocation.

Navigation bar show/hide

This isn't something that can fit into a few lines of code, but this is one approach that might work for you.

To hide the navigation bar:

[[self navigationController] setNavigationBarHidden:YES animated:YES];

To show it:

[[self navigationController] setNavigationBarHidden:NO animated:YES];

Documentation for this method is available here.

To listen for a "double click" or double-tap, subclass UIView and make an instance of that subclass your view controller's view property.

In the view subclass, override its -touchesEnded:withEvent: method and count how many touches you get in a duration of time, by measuring the time between two consecutive taps, perhaps with CACurrentMediaTime(). Or test the result from [touch tapCount].

If you get two taps, your subclassed view issues an NSNotification that your view controller has registered to listen for.

When your view controller hears the notification, it fires a selector that either hides or shows the navigation bar using the aforementioned code, depending on the navigation bar's current visible state, accessed through reading the navigation bar's isHidden property.

EDIT

The part of my answer for handling tap events is probably useful back before iOS 3.1. The UIGestureRecognizer class is probably a better approach for handling double-taps, these days.

EDIT 2

The Swift way to hide the navigation bar is:

navigationController?.setNavigationBarHidden(true, animated: true)

To show it:

navigationController?.setNavigationBarHidden(false, animated: true)

Date query with ISODate in mongodb doesn't seem to work

In the MongoDB shell:

db.getCollection('sensorevents').find({from:{$gt: new ISODate('2015-08-30 16:50:24.481Z')}})

In my nodeJS code ( using Mongoose )

    SensorEvent.Model.find( {
        from: { $gt: new Date( SensorEventListener.lastSeenSensorFrom ) }
    } )

I am querying my sensor events collection to return values where the 'from' field is greater than the given date

How to copy files between two nodes using ansible

To copy remote-to-remote files you can use the synchronize module with 'delegate_to: source-server' keyword:

- hosts: serverB
  tasks:    
   - name: Copy Remote-To-Remote (from serverA to serverB)
     synchronize: src=/copy/from_serverA dest=/copy/to_serverB
     delegate_to: serverA

This playbook can run from your machineC.

Spring MVC Missing URI template variable

I got this error for a stupid mistake, the variable name in the @PathVariable wasn't matching the one in the @RequestMapping

For example

@RequestMapping(value = "/whatever/{**contentId**}", method = RequestMethod.POST)
public … method(@PathVariable Integer **contentID**){
}

It may help others

How to set a header in an HTTP response?

In my Controller, I merely added an HttpServletResponse parameter and manually added the headers, no filter or intercept required and it works fine:

httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET, OPTIONS");
httpServletResponse.setHeader("Access-Control-Allow-Headers","Origin, X-Requested-With, Content-Type, Accept, X-Auth-Token, X-Csrf-Token, WWW-Authenticate, Authorization");
httpServletResponse.setHeader("Access-Control-Allow-Credentials", "false");
httpServletResponse.setHeader("Access-Control-Max-Age", "3600");

how to end ng serve or firebase serve

it is enough to modify something in your text editor and reload localhost. all your connection will be lost nd you have opsibility to ng serve the new project in the console.

remove item from array using its name / value

you can use delete operator to delete property by it's name

delete objectExpression.property

or iterate through the object and find the value you need and delete it:

for(prop in Obj){
   if(Obj.hasOwnProperty(prop)){
      if(Obj[prop] === 'myValue'){
        delete Obj[prop];
      }
   }
}

How to pass parameter to a promise function

Try this:

function someFunction(username, password) {
      return new Promise((resolve, reject) => {
        // Do something with the params username and password...
        if ( /* everything turned out fine */ ) {
          resolve("Stuff worked!");
        } else {
          reject(Error("It didn't work!"));
        }
      });
    }
    
    someFunction(username, password)
      .then((result) => {
        // Do something...
      })
      .catch((err) => {
        // Handle the error...
      });

How do I create a Java string from the contents of a file?

Use code:

File file = new File("input.txt");
BufferedInputStream bin = new BufferedInputStream(new FileInputStream(
                file));
byte[] buffer = new byte[(int) file.length()];
bin.read(buffer);
String fileStr = new String(buffer);

fileStr contains output in String.

VHDL - How should I create a clock in a testbench?

How to use a clock and do assertions

This example shows how to generate a clock, and give inputs and assert outputs for every cycle. A simple counter is tested here.

The key idea is that the process blocks run in parallel, so the clock is generated in parallel with the inputs and assertions.

library ieee;
use ieee.std_logic_1164.all;

entity counter_tb is
end counter_tb;

architecture behav of counter_tb is
    constant width : natural := 2;
    constant clk_period : time := 1 ns;

    signal clk : std_logic := '0';
    signal data : std_logic_vector(width-1 downto 0);
    signal count : std_logic_vector(width-1 downto 0);

    type io_t is record
        load : std_logic;
        data : std_logic_vector(width-1 downto 0);
        count : std_logic_vector(width-1 downto 0);
    end record;
    type ios_t is array (natural range <>) of io_t;
    constant ios : ios_t := (
        ('1', "00", "00"),
        ('0', "UU", "01"),
        ('0', "UU", "10"),
        ('0', "UU", "11"),

        ('1', "10", "10"),
        ('0', "UU", "11"),
        ('0', "UU", "00"),
        ('0', "UU", "01")
    );
begin
    counter_0: entity work.counter port map (clk, load, data, count);

    process
    begin
        for i in ios'range loop
            load <= ios(i).load;
            data <= ios(i).data;
            wait until falling_edge(clk);
            assert count = ios(i).count;
        end loop;
        wait;
    end process;

    process
    begin
        for i in 1 to 2 * ios'length loop
            wait for clk_period / 2;
            clk <= not clk;
        end loop;
        wait;
    end process;
end behav;

The counter would look like this:

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all; -- unsigned

entity counter is
    generic (
        width : in natural := 2
    );
    port (
        clk, load : in std_logic;
        data : in std_logic_vector(width-1 downto 0);
        count : out std_logic_vector(width-1 downto 0)
    );
end entity counter;

architecture rtl of counter is
    signal cnt : unsigned(width-1 downto 0);
begin
    process(clk) is
    begin
        if rising_edge(clk) then
            if load = '1' then
                cnt <= unsigned(data);
            else
                cnt <= cnt + 1;
            end if;
        end if;
    end process;
    count <= std_logic_vector(cnt);
end architecture rtl;

How do I merge a specific commit from one branch into another in Git?

If BranchA has not been pushed to a remote then you can reorder the commits using rebase and then simply merge. It's preferable to use merge over rebase when possible because it doesn't create duplicate commits.

git checkout BranchA
git rebase -i HEAD~113
... reorder the commits so the 10 you want are first ...
git checkout BranchB
git merge [the 10th commit]

What is the difference between gravity and layout_gravity in Android?

The difference

android:layout_gravity is the Outside gravity of the View. Specifies the direction in which the View should touch its parent's border.

android:gravity is the Inside gravity of that View. Specifies in which direction its contents should align.

HTML/CSS Equivalents

(if you are coming from a web development background)

Android                 | CSS
————————————————————————+————————————
android:layout_gravity  | float
android:gravity         | text-align

Easy trick to help you remember

Take layout-gravity as "Lay-outside-gravity".

Center a popup window on screen?

You can use css to do it, just give the following properties to the element to be placed in the center of the popup

element{

position:fixed;
left: 50%;
top: 50%;
-ms-transform: translate(-50%,-50%);
-moz-transform:translate(-50%,-50%);
-webkit-transform: translate(-50%,-50%);
 transform: translate(-50%,-50%);

}

Angular 2 @ViewChild annotation returns undefined

The issue as previously mentioned is the ngIf which is causing the view to be undefined. The answer is to use ViewChildren instead of ViewChild. I had similar issue where I didn't want a grid to be shown until all the reference data had been loaded.

html:

   <section class="well" *ngIf="LookupData != null">
       <h4 class="ra-well-title">Results</h4>
       <kendo-grid #searchGrid> </kendo-grid>
   </section>

Component Code

import { Component, ViewChildren, OnInit, AfterViewInit, QueryList  } from '@angular/core';
import { GridComponent } from '@progress/kendo-angular-grid';

export class SearchComponent implements OnInit, AfterViewInit
{
    //other code emitted for clarity

    @ViewChildren("searchGrid")
    public Grids: QueryList<GridComponent>

    private SearchGrid: GridComponent

    public ngAfterViewInit(): void
    {

        this.Grids.changes.subscribe((comps: QueryList <GridComponent>) =>
        {
            this.SearchGrid = comps.first;
        });


    }
}

Here we are using ViewChildren on which you can listen for changes. In this case any children with the reference #searchGrid. Hope this helps.

How to change ProgressBar's progress indicator color in Android

I copied this from one of my apps, so there's prob a few extra attributes, but should give you the idea. This is from the layout that has the progress bar:

<ProgressBar
    android:id="@+id/ProgressBar"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:indeterminate="false"
    android:maxHeight="10dip"
    android:minHeight="10dip"
    android:progress="50"
    android:progressDrawable="@drawable/greenprogress" />

Then create a new drawable with something similar to the following (In this case greenprogress.xml):

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="5dip" />
            <gradient
                android:angle="270"
                android:centerColor="#ff5a5d5a"
                android:centerY="0.75"
                android:endColor="#ff747674"
                android:startColor="#ff9d9e9d" />
        </shape>
    </item>

    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <corners android:radius="5dip" />
                <gradient
                    android:angle="270"
                    android:centerColor="#80ffb600"
                    android:centerY="0.75"
                    android:endColor="#a0ffcb00"
                    android:startColor="#80ffd300" />
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <corners android:radius="5dip" />
                <gradient
                    android:angle="270"
                    android:endColor="#008000"
                    android:startColor="#33FF33" />
            </shape>
        </clip>
    </item>

</layer-list>

You can change up the colors as needed, this will give you a green progress bar.

Use PHP to create, edit and delete crontab jobs?

Check a cronjob

function cronjob_exists($command){

    $cronjob_exists=false;

    exec('crontab -l', $crontab);


    if(isset($crontab)&&is_array($crontab)){

        $crontab = array_flip($crontab);

        if(isset($crontab[$command])){

            $cronjob_exists=true;

        }

    }
    return $cronjob_exists;
}

Append a cronjob

function append_cronjob($command){

    if(is_string($command)&&!empty($command)&&cronjob_exists($command)===FALSE){

        //add job to crontab
        exec('echo -e "`crontab -l`\n'.$command.'" | crontab -', $output);


    }

    return $output;
}

Remove a crontab

exec('crontab -r', $crontab);

Example

exec('crontab -r', $crontab);

append_cronjob('* * * * * curl -s http://localhost/cron/test1.php');

append_cronjob('* * * * * curl -s http://localhost/cron/test2.php');

append_cronjob('* * * * * curl -s http://localhost/cron/test3.php');

How do I deserialize a JSON string into an NSDictionary? (For iOS 5+)

NSData *data = [strChangetoJSON dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonResponse = [NSJSONSerialization JSONObjectWithData:data
                                                             options:kNilOptions
                                                               error:&error];

For example you have a NSString with special characters in NSString strChangetoJSON. Then you can convert that string to JSON response using above code.

How do I append text to a file?

cat >> filename
This is text, perhaps pasted in from some other source.
Or else entered at the keyboard, doesn't matter. 
^D

Essentially, you can dump any text you want into the file. CTRL-D sends an end-of-file signal, which terminates input and returns you to the shell.

How should I tackle --secure-file-priv in MySQL?

MySQL use this system variable to control where you can import you files

mysql> SHOW VARIABLES LIKE "secure_file_priv";
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| secure_file_priv | NULL  |
+------------------+-------+

So problem is how to change system variables such as secure_file_priv.

shutdown mysqld
sudo mysqld_safe --secure_file_priv=""

now you may see like this:

mysql> SHOW VARIABLES LIKE "secure_file_priv";
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| secure_file_priv |       |
+------------------+-------+

php exec() is not executing the command

You might also try giving the full path to the binary you're trying to run. That solved my problem when trying to use ImageMagick.

How to put wildcard entry into /etc/hosts?

Here is the configuration for those trying to accomplish the original goal (wildcards all pointing to same codebase -- install nothing, dev environment ie, XAMPP)

hosts file (add an entry)

file: /etc/hosts (non-windows)

127.0.0.1   example.local

httpd.conf configuration (enable vhosts)

file: /XAMPP/etc/httpd.conf

# Virtual hosts
Include etc/extra/httpd-vhosts.conf

httpd-vhosts.conf configuration

file: XAMPP/etc/extra/httpd-vhosts.conf

<VirtualHost *:80>
    ServerAdmin [email protected]
    DocumentRoot "/path_to_XAMPP/htdocs"
    ServerName example.local
    ServerAlias *.example.local
#    SetEnv APP_ENVIRONMENT development
#    ErrorLog "logs/example.local-error_log"
#    CustomLog "logs/example.local-access_log" common
</VirtualHost>

restart apache

create pac file:

save as whatever.pac wherever you want to and then load the file in the browser's network>proxy>auto_configuration settings (reload if you alter this)

function FindProxyForURL(url, host) {
  if (shExpMatch(host, "*example.local")) {
    return "PROXY example.local";
  }
  return "DIRECT";
}

MySQL Workbench Edit Table Data is read only

if the table does not have primary key or unique non-nullable defined, then MySql workbench could not able to edit the data.

GridLayout and Row/Column Span Woe

It feels pretty hacky, but I managed to get the correct look by adding an extra column and row beyond what is needed. Then I filled the extra column with a Space in each row defining a height and filled the extra row with a Space in each col defining a width. For extra flexibility, I imagine these Space sizes could be set in code to provide something similar to weights. I tried to add a screenshot, but I do not have the reputation necessary.

<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnCount="9"
android:orientation="horizontal"
android:rowCount="8" >

<Button
    android:layout_columnSpan="2"
    android:layout_gravity="fill"
    android:layout_rowSpan="2"
    android:text="1" />

<Button
    android:layout_columnSpan="2"
    android:layout_gravity="fill_horizontal"
    android:text="2" />

<Button
    android:layout_gravity="fill_vertical"
    android:layout_rowSpan="4"
    android:text="3" />

<Button
    android:layout_columnSpan="3"
    android:layout_gravity="fill"
    android:layout_rowSpan="2"
    android:text="4" />

<Button
    android:layout_columnSpan="3"
    android:layout_gravity="fill_horizontal"
    android:text="5" />

<Button
    android:layout_columnSpan="2"
    android:layout_gravity="fill_horizontal"
    android:text="6" />

<Space
    android:layout_width="36dp"
    android:layout_column="0"
    android:layout_row="7" />

<Space
    android:layout_width="36dp"
    android:layout_column="1"
    android:layout_row="7" />

<Space
    android:layout_width="36dp"
    android:layout_column="2"
    android:layout_row="7" />

<Space
    android:layout_width="36dp"
    android:layout_column="3"
    android:layout_row="7" />

<Space
    android:layout_width="36dp"
    android:layout_column="4"
    android:layout_row="7" />

<Space
    android:layout_width="36dp"
    android:layout_column="5"
    android:layout_row="7" />

<Space
    android:layout_width="36dp"
    android:layout_column="6"
    android:layout_row="7" />

<Space
    android:layout_width="36dp"
    android:layout_column="7"
    android:layout_row="7" />

<Space
    android:layout_height="36dp"
    android:layout_column="8"
    android:layout_row="0" />

<Space
    android:layout_height="36dp"
    android:layout_column="8"
    android:layout_row="1" />

<Space
    android:layout_height="36dp"
    android:layout_column="8"
    android:layout_row="2" />

<Space
    android:layout_height="36dp"
    android:layout_column="8"
    android:layout_row="3" />

<Space
    android:layout_height="36dp"
    android:layout_column="8"
    android:layout_row="4" />

<Space
    android:layout_height="36dp"
    android:layout_column="8"
    android:layout_row="5" />

<Space
    android:layout_height="36dp"
    android:layout_column="8"
    android:layout_row="6" />

</GridLayout>

screenshot

Extract text from a string

Just to add a non-regex solution:

'(' + $myString.Split('()')[1] + ')'

This splits the string at the parentheses and takes the string from the array with the program name in it.

If you don't need the parentheses, just use:

$myString.Split('()')[1]

program cant start because php5.dll is missing

I needed to change environment variable PATH and PHPRC. Also open new cmd.

I already had PHP installed and added EasyPHP when the problem came up. After I changed both variables to C:\Program Files (x86)\EasyPHP-DevServer-14.1VC9\binaries\php\php_runningversion it worked fine.

Can I add jars to maven 2 build classpath without installing them?

For throw away code only

set scope == system and just make up a groupId, artifactId, and version

<dependency>
    <groupId>org.swinglabs</groupId>
    <artifactId>swingx</artifactId>
    <version>0.9.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/lib/swingx-0.9.3.jar</systemPath>
</dependency>

Note: system dependencies are not copied into resulted jar/war
(see How to include system dependencies in war built using maven)

How to disable button in React.js

just Add:

<button disabled={this.input.value?"true":""} className="add-item__button" onClick={this.add.bind(this)}>Add</button>

C++ Convert string (or char) to wstring (or wchar_t)

int StringToWString(std::wstring &ws, const std::string &s)
{
    std::wstring wsTmp(s.begin(), s.end());

    ws = wsTmp;

    return 0;
}

reading external sql script in python

A very simple way to read an external script into an sqlite database in python is using executescript():

import sqlite3

conn = sqlite3.connect('csc455_HW3.db')

with open('ZooDatabase.sql', 'r') as sql_file:
    conn.executescript(sql_file.read())

conn.close()

Array and string offset access syntax with curly braces is deprecated

It's really simple to fix the issue, however keep in mind that you should fork and commit your changes for each library you are using in their repositories to help others as well.

Let's say you have something like this in your code:

$str = "test";
echo($str{0});

since PHP 7.4 curly braces method to get individual characters inside a string has been deprecated, so change the above syntax into this:

$str = "test";
echo($str[0]);

Fixing the code in the question will look something like this:

public function getRecordID(string $zoneID, string $type = '', string $name = ''): string
{
    $records = $this->listRecords($zoneID, $type, $name);
    if (isset($records->result[0]->id)) {
        return $records->result[0]->id;
    }
    return false;
}

Docker how to change repository name or rename image?

As a shorthand you can run:

docker tag d58 myname/server:latest

Where d58 represents the first 3 characters of the IMAGE ID,in this case, that's all you need.

Finally, you can remove the old image as follows:

docker rmi server

Can I make a phone call from HTML on Android?

I have just written an app which can make a call from a web page - I don't know if this is any use to you, but I include anyway:

in your onCreate you'll need to use a webview and assign a WebViewClient, as below:

browser = (WebView) findViewById(R.id.webkit);
browser.setWebViewClient(new InternalWebViewClient());

then handle the click on a phone number like this:

private class InternalWebViewClient extends WebViewClient {

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
         if (url.indexOf("tel:") > -1) {
            startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse(url)));
            return true;
        } else {
            return false;
        }
    }
}

Let me know if you need more pointers.

YAML Multi-Line Arrays

have you tried this?

-
  name: Jack
  age: 32
-
  name: Claudia
  age: 25

I get this: [{"name"=>"Jack", "age"=>32}, {"name"=>"Claudia", "age"=>25}] (I use the YAML Ruby class).

PHPDoc type hinting for array of objects?

PSR-5: PHPDoc proposes a form of Generics-style notation.

Syntax

Type[]
Type<Type>
Type<Type[, Type]...>
Type<Type[|Type]...>

Values in a Collection MAY even be another array and even another Collection.

Type<Type<Type>>
Type<Type<Type[, Type]...>>
Type<Type<Type[|Type]...>>

Examples

<?php

$x = [new Name()];
/* @var $x Name[] */

$y = new Collection([new Name()]);
/* @var $y Collection<Name> */

$a = new Collection(); 
$a[] = new Model_User(); 
$a->resetChanges(); 
$a[0]->name = "George"; 
$a->echoChanges();
/* @var $a Collection<Model_User> */

Note: If you are expecting an IDE to do code assist then it's another question about if the IDE supports PHPDoc Generic-style collections notation.

From my answer to this question.

Why is Git better than Subversion?

First, concurrent version control seems like an easy problem to solve. It's not at all. Anyway...

SVN is quite non-intuitive. Git is even worse. [sarcastic-speculation] This might be because developers, that like hard problems like concurrent version control, don't have much interest in making a good UI. [/sarcastic-speculation]

SVN supporters think they don't need a distributed version-control system. I thought that too. But now that we use Git exclusively, I'm a believer. Now version control works for me AND the team/project instead of just working for the project. When I need a branch, I branch. Sometimes it's a branch that has a corresponding branch on the server, and sometimes it does not. Not to mention all the other advantages that I'll have to go study up on (thanks in part to the arcane and absurd lack of UI that is a modern version control system).

Disable all dialog boxes in Excel while running VB script?

In Access VBA I've used this to turn off all the dialogs when running a bunch of updates:

DoCmd.SetWarnings False

After running all the updates, the last step in my VBA script is:

DoCmd.SetWarnings True

Hope this helps.

Cannot delete directory with Directory.Delete(path, true)

The directory or a file in it is locked and cannot be deleted. Find the culprit who locks it and see if you can eliminate it.

C# Threading - How to start and stop a thread

Use a static AutoResetEvent in your spawned threads to call back to the main thread using the Set() method. This guy has a fairly good demo in SO on how to use it.

AutoResetEvent clarification

Check if string begins with something?

Have a look at JavaScript substring() method.

Download text/csv content as files from server in Angular

$http service returns a promise which has two callback methods as shown below.

$http({method: 'GET', url: '/someUrl'}).
  success(function(data, status, headers, config) {
     var anchor = angular.element('<a/>');
     anchor.attr({
         href: 'data:attachment/csv;charset=utf-8,' + encodeURI(data),
         target: '_blank',
         download: 'filename.csv'
     })[0].click();

  }).
  error(function(data, status, headers, config) {
    // handle error
  });

Retrieving the text of the selected <option> in <select> element

The options property contains all the <options> - from there you can look at .text

document.getElementById('test').options[0].text == 'Text One'

Inline JavaScript onclick function

you can use Self-Executing Anonymous Functions. this code will work:

<a href="#" onClick="(function(){
    alert('Hey i am calling');
    return false;
})();return false;">click here</a>

see JSfiddle

How do I draw a shadow under a UIView?

You can try this .... you can play with the values. The shadowRadius dictates the amount of blur. shadowOffset dictates where the shadow goes.

Swift 2.0

let radius: CGFloat = demoView.frame.width / 2.0 //change it to .height if you need spread for height
let shadowPath = UIBezierPath(rect: CGRect(x: 0, y: 0, width: 2.1 * radius, height: demoView.frame.height))
//Change 2.1 to amount of spread you need and for height replace the code for height

demoView.layer.cornerRadius = 2
demoView.layer.shadowColor = UIColor.blackColor().CGColor
demoView.layer.shadowOffset = CGSize(width: 0.5, height: 0.4)  //Here you control x and y
demoView.layer.shadowOpacity = 0.5
demoView.layer.shadowRadius = 5.0 //Here your control your blur
demoView.layer.masksToBounds =  false
demoView.layer.shadowPath = shadowPath.CGPath

Swift 3.0

let radius: CGFloat = demoView.frame.width / 2.0 //change it to .height if you need spread for height 
let shadowPath = UIBezierPath(rect: CGRect(x: 0, y: 0, width: 2.1 * radius, height: demoView.frame.height)) 
//Change 2.1 to amount of spread you need and for height replace the code for height

demoView.layer.cornerRadius = 2
demoView.layer.shadowColor = UIColor.black.cgColor
demoView.layer.shadowOffset = CGSize(width: 0.5, height: 0.4)  //Here you control x and y
demoView.layer.shadowOpacity = 0.5
demoView.layer.shadowRadius = 5.0 //Here your control your blur
demoView.layer.masksToBounds =  false
demoView.layer.shadowPath = shadowPath.cgPath

Example with spread

To create a basic shadow

    demoView.layer.cornerRadius = 2
    demoView.layer.shadowColor = UIColor.blackColor().CGColor
    demoView.layer.shadowOffset = CGSizeMake(0.5, 4.0); //Here your control your spread
    demoView.layer.shadowOpacity = 0.5 
    demoView.layer.shadowRadius = 5.0 //Here your control your blur

Basic Shadow example in Swift 2.0

Parse date string and change format

You can install the dateutil library. Its parse function can figure out what format a string is in without having to specify the format like you do with datetime.strptime.

from dateutil.parser import parse
dt = parse('Mon Feb 15 2010')
print(dt)
# datetime.datetime(2010, 2, 15, 0, 0)
print(dt.strftime('%d/%m/%Y'))
# 15/02/2010

Cluster analysis in R: determine the optimal number of clusters

Splendid answer from Ben. However I'm surprised that the Affinity Propagation (AP) method has been here suggested just to find the number of cluster for the k-means method, where in general AP do a better job clustering the data. Please see the scientific paper supporting this method in Science here:

Frey, Brendan J., and Delbert Dueck. "Clustering by passing messages between data points." science 315.5814 (2007): 972-976.

So if you are not biased toward k-means I suggest to use AP directly, which will cluster the data without requiring knowing the number of clusters:

library(apcluster)
apclus = apcluster(negDistMat(r=2), data)
show(apclus)

If negative euclidean distances are not appropriate, then you can use another similarity measures provided in the same package. For example, for similarities based on Spearman correlations, this is what you need:

sim = corSimMat(data, method="spearman")
apclus = apcluster(s=sim)

Please note that those functions for similarities in the AP package are just provided for simplicity. In fact, apcluster() function in R will accept any matrix of correlations. The same before with corSimMat() can be done with this:

sim = cor(data, method="spearman")

sim = cor(t(data), method="spearman")

depending on what you want to cluster on your matrix (rows or cols).

Use component from another module

One big and great approach is to load the module from a NgModuleFactory, you can load a module inside another module by calling this:

constructor(private loader: NgModuleFactoryLoader, private injector: Injector) {}

loadModule(path: string) {
    this.loader.load(path).then((moduleFactory: NgModuleFactory<any>) => {
        const entryComponent = (<any>moduleFactory.moduleType).entry;
        const moduleRef = moduleFactory.create(this.injector);
        const compFactory = moduleRef.componentFactoryResolver.resolveComponentFactory(entryComponent);
        this.lazyOutlet.createComponent(compFactory);
    });
}

I got this from here.

Javascript wait() function

You shouldn't edit it, you should completely scrap it.

Any attempt to make execution stop for a certain amount of time will lock up the browser and switch it to a Not Responding state. The only thing you can do is use setTimeout correctly.

Determining image file size + dimensions via Javascript?

The only thing you can do is to upload the image to a server and check the image size and dimension using some server side language like C#.

Edit:

Your need can't be done using javascript only.

Remove/ truncate leading zeros by javascript/jquery

You can use a regular expression that matches zeroes at the beginning of the string:

s = s.replace(/^0+/, '');

org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 15

I faced this issue with tomcat 7 + jdk 1.8

with java 1.7 and lower versions it's working fine.

window -> preferences -> java -> installed jre

in my case I changed jre1.8 to JDK 1.7

and accordingly modify project facet , select same java version as it's there in selected Installed JRE.

java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer in java 1.6

The number of results can (theoretically) be greater than the range of an integer. I would refactor the code and work with the returned long value instead.

MongoDB via Mongoose JS - What is findByID?

findById is a convenience method on the model that's provided by Mongoose to find a document by its _id. The documentation for it can be found here.

Example:

// Search by ObjectId
var id = "56e6dd2eb4494ed008d595bd";
UserModel.findById(id, function (err, user) { ... } );

Functionally, it's the same as calling:

UserModel.findOne({_id: id}, function (err, user) { ... });

Note that Mongoose will cast the provided id value to the type of _id as defined in the schema (defaulting to ObjectId).

How can I generate a self-signed certificate with SubjectAltName using OpenSSL?

Can someone help me with the exact syntax?

It's a three-step process, and it involves modifying the openssl.cnf file. You might be able to do it with only command line options, but I don't do it that way.

Find your openssl.cnf file. It is likely located in /usr/lib/ssl/openssl.cnf:

$ find /usr/lib -name openssl.cnf
/usr/lib/openssl.cnf
/usr/lib/openssh/openssl.cnf
/usr/lib/ssl/openssl.cnf

On my Debian system, /usr/lib/ssl/openssl.cnf is used by the built-in openssl program. On recent Debian systems it is located at /etc/ssl/openssl.cnf

You can determine which openssl.cnf is being used by adding a spurious XXX to the file and see if openssl chokes.

First, modify the req parameters. Add an alternate_names section to openssl.cnf with the names you want to use. There are no existing alternate_names sections, so it does not matter where you add it.

[ alternate_names ]

DNS.1        = example.com
DNS.2        = www.example.com
DNS.3        = mail.example.com
DNS.4        = ftp.example.com

Next, add the following to the existing [ v3_ca ] section. Search for the exact string [ v3_ca ]:

subjectAltName      = @alternate_names

You might change keyUsage to the following under [ v3_ca ]:

keyUsage = digitalSignature, keyEncipherment

digitalSignature and keyEncipherment are standard fare for a server certificate. Don't worry about nonRepudiation. It's a useless bit thought up by computer science guys/gals who wanted to be lawyers. It means nothing in the legal world.

In the end, the IETF (RFC 5280), browsers and CAs run fast and loose, so it probably does not matter what key usage you provide.

Second, modify the signing parameters. Find this line under the CA_default section:

# Extension copying option: use with caution.
# copy_extensions = copy

And change it to:

# Extension copying option: use with caution.
copy_extensions = copy

This ensures the SANs are copied into the certificate. The other ways to copy the DNS names are broken.

Third, generate your self-signed certificate:

$ openssl genrsa -out private.key 3072
$ openssl req -new -x509 -key private.key -sha256 -out certificate.pem -days 730
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
...

Finally, examine the certificate:

$ openssl x509 -in certificate.pem -text -noout
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 9647297427330319047 (0x85e215e5869042c7)
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, ST=MD, L=Baltimore, O=Test CA, Limited, CN=Test CA/[email protected]
        Validity
            Not Before: Feb  1 05:23:05 2014 GMT
            Not After : Feb  1 05:23:05 2016 GMT
        Subject: C=US, ST=MD, L=Baltimore, O=Test CA, Limited, CN=Test CA/[email protected]
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (3072 bit)
                Modulus:
                    00:e2:e9:0e:9a:b8:52:d4:91:cf:ed:33:53:8e:35:
                    ...
                    d6:7d:ed:67:44:c3:65:38:5d:6c:94:e5:98:ab:8c:
                    72:1c:45:92:2c:88:a9:be:0b:f9
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Subject Key Identifier:
                34:66:39:7C:EC:8B:70:80:9E:6F:95:89:DB:B5:B9:B8:D8:F8:AF:A4
            X509v3 Authority Key Identifier:
                keyid:34:66:39:7C:EC:8B:70:80:9E:6F:95:89:DB:B5:B9:B8:D8:F8:AF:A4

            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Key Usage:
                Digital Signature, Non Repudiation, Key Encipherment, Certificate Sign
            X509v3 Subject Alternative Name:
                DNS:example.com, DNS:www.example.com, DNS:mail.example.com, DNS:ftp.example.com
    Signature Algorithm: sha256WithRSAEncryption
         3b:28:fc:e3:b5:43:5a:d2:a0:b8:01:9b:fa:26:47:8e:5c:b7:
         ...
         71:21:b9:1f:fa:30:19:8b:be:d2:19:5a:84:6c:81:82:95:ef:
         8b:0a:bd:65:03:d1

What's the best way to limit text length of EditText in Android

Another way you can achieve this is by adding the following definition to the XML file:

<EditText
    android:id="@+id/input"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:inputType="number"
    android:maxLength="6"
    android:hint="@string/hint_gov"
    android:layout_weight="1"/>

This will limit the maximum length of the EditText widget to 6 characters.

Entity Framework 6 GUID as primary key: Cannot insert the value NULL into column 'Id', table 'FileStore'; column does not allow nulls

In addition to adding these attributes to your Id column:

[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public Guid Id { get; set; }

in your migration you should change your CreateTable to add the defaultValueSQL property to your column i.e.:

Id = c.Guid(nullable: false, identity: true, defaultValueSql: "newsequentialid()"),

This will prevent you from having to manually touch your database which, as you pointed out in the comments, is something you want to avoid with Code First.

With MySQL, how can I generate a column containing the record index in a table?

Here comes the structure of template I used:

  select
          /*this is a row number counter*/
          ( select @rownum := @rownum + 1 from ( select @rownum := 0 ) d2 ) 
          as rownumber,
          d3.*
  from 
  ( select d1.* from table_name d1 ) d3

And here is my working code:

select     
           ( select @rownum := @rownum + 1 from ( select @rownum := 0 ) d2 ) 
           as rownumber,
           d3.*
from
(   select     year( d1.date ), month( d1.date ), count( d1.id )
    from       maindatabase d1
    where      ( ( d1.date >= '2013-01-01' ) and ( d1.date <= '2014-12-31' ) )
    group by   YEAR( d1.date ), MONTH( d1.date ) ) d3

Case objects vs Enumerations in Scala

One big difference is that Enumerations come with support for instantiating them from some name String. For example:

object Currency extends Enumeration {
   val GBP = Value("GBP")
   val EUR = Value("EUR") //etc.
}

Then you can do:

val ccy = Currency.withName("EUR")

This is useful when wishing to persist enumerations (for example, to a database) or create them from data residing in files. However, I find in general that enumerations are a bit clumsy in Scala and have the feel of an awkward add-on, so I now tend to use case objects. A case object is more flexible than an enum:

sealed trait Currency { def name: String }
case object EUR extends Currency { val name = "EUR" } //etc.

case class UnknownCurrency(name: String) extends Currency

So now I have the advantage of...

trade.ccy match {
  case EUR                   =>
  case UnknownCurrency(code) =>
}

As @chaotic3quilibrium pointed out (with some corrections to ease reading):

Regarding "UnknownCurrency(code)" pattern, there are other ways to handle not finding a currency code string than "breaking" the closed set nature of the Currency type. UnknownCurrency being of type Currency can now sneak into other parts of an API.

It's advisable to push that case outside Enumeration and make the client deal with an Option[Currency] type that would clearly indicate there is really a matching problem and "encourage" the user of the API to sort it out him/herself.

To follow up on the other answers here, the main drawbacks of case objects over Enumerations are:

Can't iterate over all instances of the "enumeration". This is certainly the case, but I've found it extremely rare in practice that this is required.
Can't instantiate easily from persisted value. This is also true but, except in the case of huge enumerations (for example, all currencies), this doesn't present a huge overhead.

How can I convert a string with dot and comma into a float in Python

s =  "123,456.908"
print float(s.replace(',', ''))

How do I fix the npm UNMET PEER DEPENDENCY warning?

You will get this warning if you are using npm v6 or before. After npm v7.0, npm development team has stated that they will automatically install peer dependencies, all together. Therefore, now you don't want to install your peer dependencies manually.

You can install npm v7.0 using this command,

npm install -g npm@7

Learn more about npm v7.0 from this blog post, published by the Github Blog.

Python vs. Java performance (runtime speed)

If you ignore the characteristics of both languages, how do you define "SPEED"? Which features should be in your benchmark and which do you want to omit?

For example:

Does it count when Java executes an empty loop faster than Python?
Or is Python faster when it notices that the loop body is empty, the loop header has no side effects and it optimizes the whole loop away?
Or is that "a language characteristic"?
Do you want to know how many bytecodes each language can execute per second?
Which ones? Only the fast ones or all of them?
How do you count the Java VM JIT compiler which turns bytecode into CPU-specific assembler code at runtime?
Do you include code compilation times (which are extra in Java but always included in Python)?

Conclusion: Your question has no answer because it isn't defined what you want. Even if you made it more clear, the question will probably become academic since you will measure something that doesn't count in real life. For all of my projects, both Java and Python have always been fast enough. Of course, I would prefer one language over the other for a specific problem in a certain context.

How to resolve Unable to load authentication plugin 'caching_sha2_password' issue

I ran into this problem on NetBeans when working with a ready-made project from this Murach JSP book. The problem was caused by using the 5.1.23 Connector J with a MySQL 8.0.13 Database. I needed to replace the old driver with a new one. After downloading the Connector J, this took three steps.

How to replace NetBeans project Connector J:

Download the current Connector J from here. Then copy it in your OS.
In NetBeans, click on the Files tab which is next to the Projects tab. Find the mysql-connector-java-5.1.23.jar or whatever old connector you have. Delete this old connector. Paste in the new Connector.
Click on the Projects tab. Navigate to the Libraries folder. Delete the old mysql connector. Right click on the Libraries folder. Select Add Jar / Folder. Navigate to the location where you put the new connector, and select open.
In the Project tab, right click on the project. Select Resolve Data Sources on the bottom of the popup menu. Click on Add Connection. At this point NetBeans skips forward and assumes you want to use the old connector. Click the Back button to get back to the skipped window. Remove the old connector, and add the new connector. Click Next and Test Connection to make sure it works.

For video reference, I found this to be useful. For IntelliJ IDEA, I found this to be useful.

Why avoid increment ("++") and decrement ("--") operators in JavaScript?

In my experience, ++i or i++ has never caused confusion other than when first learning about how the operator works. It is essential for the most basic for loops and while loops that are taught by any highschool or college course taught in languages where you can use the operator. I personally find doing something like what is below to look and read better than something with a++ being on a separate line.

_x000D_

while ( a < 10 ){_x000D_
    array[a++] = val_x000D_
}

_x000D_

In the end it is a style preference and not anything more, what is more important is that when you do this in your code you stay consistent so that others working on the same code can follow and not have to process the same functionality in different ways.

Also, Crockford seems to use i-=1, which I find to be harder to read than --i or i--

Count elements with jQuery

I believe this works:

$(".MyClass").length

One liner for If string is not null or empty else

Old question, but thought I'd add this to help out,

#if DOTNET35
bool isTrulyEmpty = String.IsNullOrEmpty(s) || s.Trim().Length == 0;
#else
bool isTrulyEmpty = String.IsNullOrWhiteSpace(s) ;
#endif

Real time data graphing on a line chart with html5

Here's a gist I discovered for real-time charts in ChartJS:
https://gist.github.com/arisetyo/5985848

ChartJS looks like it's simple to use and looks nice.

Also there's FusionCharts, a more sophisticated library for enterprise use, with a demo of real time here:
http://www.fusioncharts.com/explore/real-time-charts

EDIT I also started using Rickshaw for real time graphs and it's easy to use and pretty customizable: http://code.shutterstock.com/rickshaw/

Converting an OpenCV Image to Black and White

Approach 1

While converting a gray scale image to a binary image, we usually use cv2.threshold() and set a threshold value manually. Sometimes to get a decent result we opt for Otsu's binarization.

I have a small hack I came across while reading some blog posts.

Convert your color (RGB) image to gray scale.
Obtain the median of the gray scale image.
Choose a threshold value either 33% above the median

Why 33%?

This is because 33% works for most of the images/data-set.

You can also work out the same approach by replacing median with the mean.

Approach 2

Another approach would be to take an x number of standard deviations (std) from the mean, either on the positive or negative side; and set a threshold. So it could be one of the following:

th1 = mean - (x * std)
th2 = mean + (x * std)

Note: Before applying threshold it is advisable to enhance the contrast of the gray scale image locally (See CLAHE).

JAVA How to remove trailing zeros from a double

Use DecimalFormat

  double answer = 5.0;
   DecimalFormat df = new DecimalFormat("###.#");
  System.out.println(df.format(answer));

How to use comparison and ' if not' in python?

Why think? If not confuses you, switch your if and else clauses around to avoid the negation.

i want to make sure that ( u0 <= u < u0+step ) before do sth.

Just write that.

if u0 <= u < u0+step:
    "do sth" # What language is "sth"?  No vowels.  An odd-looking word.
else:
    u0 = u0+ step

Why overthink it?

If you need an empty if -- and can't work out the logic -- use pass.

 if some-condition-that's-too-complex-for-me-to-invert:
     pass
 else: 
     do real work here

Automatically resize jQuery UI dialog to the width of the content loaded by ajax

I had a similar problem.

Setting width to "auto" worked fine for me but when the dialog contained a lot of text it made it span the full width of the page, ignoring the maxWidth setting.

Setting maxWidth on create works fine though:

$( ".selector" ).dialog({
  width: "auto",
  // maxWidth: 660, // This won't work
  create: function( event, ui ) {
    // Set maxWidth
    $(this).css("maxWidth", "660px");
  }
});

Returning multiple values from a C++ function

Boost tuple would be my preferred choice for a generalized system of returning more than one value from a function.

Possible example:

include "boost/tuple/tuple.hpp"

tuple <int,int> divide( int dividend,int divisor ) 

{
  return make_tuple(dividend / divisor,dividend % divisor )
}

Convert String value format of YYYYMMDDHHMMSS to C# DateTime

Define your own parse format string to use.

string formatString = "yyyyMMddHHmmss";
string sample = "20100611221912";
DateTime dt = DateTime.ParseExact(sample,formatString,null);

In case you got a datetime having milliseconds, use the following formatString

string format = "yyyyMMddHHmmssfff"
string dateTime = "20140123205803252";
DateTime.ParseExact(dateTime ,format,CultureInfo.InvariantCulture);

Thanks

TypeError : Unhashable type

TLDR:

- You can't hash a list, a set, nor a dict to put that into sets

- You can hash a tuple to put it into a set.

Example:

>>> {1, 2, [3, 4]}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'

>>> {1, 2, (3, 4)}
set([1, 2, (3, 4)])

Note that hashing is somehow recursive and the above holds true for nested items:

>>> {1, 2, 3, (4, [2, 3])}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'

Dict keys also are hashable, so the above holds for dict keys too.

Check if checkbox is NOT checked on click - jQuery

jQuery to check for checked? Really?

if(!this.checked) {

Don't use a bazooka to do a razor's job.

Compare cell contents against string in Excel

You can use the EXACT Function for exact string comparisons.

=IF(EXACT(A1, "ENG"), 1, 0)

Razor-based view doesn't see referenced assemblies

In my case, I was using Razor Views outside of a web application.
Copying the dlls to my bin folder in solution solved the problem.

"This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded"

I have a .NET 4.0 dll project that is being called by a .NET 2.0 project. Is there a way to reconcile the difference in framework?

Not that way round, no. The .NET 4 CLR can load .NET 2 assemblies (usually - there are a few exceptions for mixed-mode assemblies, IIRC), but not vice versa.

You'll either have to upgrade the .NET 2 project to .NET 4, or downgrade the .NET 4 project to .NET 3.5 (or earlier).

JavaScript: Get image dimensions

var img = new Image();

img.onload = function(){
  var height = img.height;
  var width = img.width;

  // code here to use the dimensions
}

img.src = url;

What is the shortcut to Auto import all in Android Studio?

For Windows/Linux, you can go to File -> Settings -> Editor -> General -> Auto Import -> Java and make the following changes:

change Insert imports on paste value to All
markAdd unambigious imports on the fly option as checked

On a Mac, do the same thing in Android Studio -> Preferences

enter image description here

After this, all unambiguous imports will be added automatically.

How to change MenuItem icon in ActionBar programmatically

Lalith's answer is correct.

You may also try this approach:

button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            invalidateOptionsMenu();
        }
    });

 @Override
 public boolean onPrepareOptionsMenu(Menu menu) {

    MenuItem settingsItem = menu.findItem(R.id.action_settings);
    // set your desired icon here based on a flag if you like
    settingsItem.setIcon(ContextCompat.getDrawable(this, R.drawable.ic_launcher)); 

    return super.onPrepareOptionsMenu(menu);
 }

How to compare two vectors for equality element by element in C++?

C++11 standard on == for std::vector

Others have mentioned that operator== does compare vector contents and works, but here is a quote from the C++11 N3337 standard draft which I believe implies that.

We first look at Chapter 23.2.1 "General container requirements", which documents things that must be valid for all containers, including therefore std::vector.

That section Table 96 "Container requirements" which contains an entry:

Expression   Operational semantics
===========  ======================
a == b       distance(a.begin(), a.end()) == distance(b.begin(), b.end()) &&
             equal(a.begin(), a.end(), b.begin())

The distance part of the semantics means that the size of both containers are the same, but stated in a generalized iterator friendly way for non random access addressable containers. distance() is defined at 24.4.4 "Iterator operations".

Then the key question is what does equal() mean. At the end of the table we see:

Notes: the algorithm equal() is defined in Clause 25.

and in section 25.2.11 "Equal" we find its definition:

template<class InputIterator1, class InputIterator2>
bool equal(InputIterator1 first1, InputIterator1 last1,
           InputIterator2 first2);

template<class InputIterator1, class InputIterator2,
class BinaryPredicate>
bool equal(InputIterator1 first1, InputIterator1 last1,
           InputIterator2 first2, BinaryPredicate pred);
1 Returns: true if for every iterator i in the range [first1,last1) the following corresponding conditions hold: *i == *(first2 + (i - first1)), pred(*i, *(first2 + (i - first1))) != false. Otherwise, returns false.

In our case, we care about the overloaded version without BinaryPredicate version, which corresponds to the first pseudo code definition *i == *(first2 + (i - first1)), which we see is just an iterator-friendly definition of "all iterated items are the same".

Scroll to bottom of div with Vue.js

I had the same need in my app (with complex nested components structure) and I unfortunately did not succeed to make it work.

Finally I used vue-scrollto that works fine !

Populating a razor dropdownlist from a List<object> in MVC

   @{
        List<CategoryModel> CategoryList = CategoryModel.GetCategoryList(UserID);
        IEnumerable<SelectListItem> CategorySelectList = CategoryList.Select(x => new SelectListItem() { Text = x.CategoryName.Trim(), Value = x.CategoryID.Trim() });
    }
    <tr>
        <td>
            <B>Assigned Category:</B>
        </td>
        <td>
            @Html.DropDownList("CategoryList", CategorySelectList, "Select a Category (Optional)")
        </td>
    </tr>

Best way to implement multi-language/globalization in large .NET project

+1 Database

Forms in your app can even re-translate themselves on the fly if corrections are made to the database.

We used a system where all the controls were mapped in an XML file (one per form) to language resource IDs, but all the IDs were in the database.

Basically, instead of having each control hold the ID (implementing an interface, or using the tag property in VB6), we used the fact that in .NET, the control tree was easily discoverable through reflection. A process when the form loaded would build the XML file if it was missing. The XML file would map the controls to their resource IDs, so this simply needed to be filled in and mapped to the database. This meant that there was no need to change the compiled binary if something was not tagged, or if it needed to be split to another ID (some words in English which might be used as both nouns and verbs might need to translate to two different words in the dictionary and not be re-used, but you might not discover this during initial assignment of IDs). But the fact is that the whole translation process becomes completely independent of your binary (every form has to inherit from a base form which knows how to translate itself and all its controls).

The only ones where the app gets more involved is when a phase with insertion points is used.

The database translation software was your basic CRUD maintenance screen with various workflow options to facilitate going through the missing translations, etc.

Swift 3 - Comparing Date objects

Swift 5:

1) If you use Date type:

let firstDate  = Date()
let secondDate = Date()

print(firstDate > secondDate)  
print(firstDate < secondDate)
print(firstDate == secondDate)

2) If you use String type:

let firstStringDate  = "2019-05-22T09:56:00.1111111"
let secondStringDate = "2019-05-22T09:56:00.2222222"

print(firstStringDate > secondStringDate)  // false
print(firstStringDate < secondStringDate)  // true
print(firstStringDate == secondStringDate) // false

I'm not sure or the second option works at 100%. But how much would I not change the values of firstStringDate and secondStringDate the result was correct.

How do I print the type or class of a variable in Swift?

Swift 3.0

let string = "Hello"
let stringArray = ["one", "two"]
let dictionary = ["key": 2]

print(type(of: string)) // "String"

// Get type name as a string
String(describing: type(of: string)) // "String"
String(describing: type(of: stringArray)) // "Array<String>"
String(describing: type(of: dictionary)) // "Dictionary<String, Int>"

// Get full type as a string
String(reflecting: type(of: string)) // "Swift.String"
String(reflecting: type(of: stringArray)) // "Swift.Array<Swift.String>"
String(reflecting: type(of: dictionary)) // "Swift.Dictionary<Swift.String, Swift.Int>"

Java - Convert String to valid URI object

Android has always had the Uri class as part of the SDK: http://developer.android.com/reference/android/net/Uri.html

You can simply do something like:

String requestURL = String.format("http://www.example.com/?a=%s&b=%s", Uri.encode("foo bar"), Uri.encode("100% fubar'd"));

Angular 2 - Setting selected value on dropdown list

Angular 2 simple dropdown selected value

It may help someone as I need to only show selected value, don't need to declare something in component and etc.

If your status is coming from the database then you can show selected value this way.

<div class="form-group">
    <label for="status">Status</label>
    <select class="form-control" name="status" [(ngModel)]="category.status">
       <option [value]="1" [selected]="category.status ==1">Active</option>
       <option [value]="0" [selected]="category.status ==0">In Active</option>
    </select>
</div>

How can I create an object based on an interface file definition in TypeScript?

I think you have basically five different options to do so. Choosing among them could be easy depending on the goal you would like to achieve.

The best way in most of the cases to use a class and instantiate it, because you are using TypeScript to apply type checking.

interface IModal {
    content: string;
    form: string;
    //...

    //Extra
    foo: (bar: string): void;
}

class Modal implements IModal {
    content: string;
    form: string;

    foo(param: string): void {
    }
}

Even if other methods are offering easier ways to create an object from an interface you should consider splitting your interface apart, if you are using your object for different matters, and it does not cause interface over-segregation:

interface IBehaviour {
    //Extra
    foo(param: string): void;
}

interface IModal extends IBehaviour{
    content: string;
    form: string;
    //...
}

On the other hand, for example during unit testing your code (if you may not applying separation of concerns frequently), you may be able to accept the drawbacks for the sake of productivity. You may apply other methods to create mocks mostly for big third party *.d.ts interfaces. And it could be a pain to always implement full anonymous objects for every huge interface.

On this path your first option is to create an empty object:

 var modal = <IModal>{};

Secondly to fully realise the compulsory part of your interface. It can be useful whether you are calling 3rd party JavaScript libraries, but I think you should create a class instead, like before:

var modal: IModal = {
    content: '',
    form: '',
    //...

    foo: (param: string): void => {
    }
};

Thirdly you can create just a part of your interface and create an anonymous object, but this way you are responsible to fulfil the contract

var modal: IModal = <any>{
    foo: (param: string): void => {

    }
};

Summarising my answer even if interfaces are optional, because they are not transpiled into JavaScript code, TypeScript is there to provide a new level of abstraction, if used wisely and consistently. I think, just because you can dismiss them in most of the cases from your own code you shouldn't.

How to put the legend out of the plot

As noted, you could also place the legend in the plot, or slightly off it to the edge as well. Here is an example using the Plotly Python API, made with an IPython Notebook. I'm on the team.

To begin, you'll want to install the necessary packages:

import plotly
import math
import random
import numpy as np

Then, install Plotly:

un='IPython.Demo'
k='1fw3zw2o13'
py = plotly.plotly(username=un, key=k)


def sin(x,n):
sine = 0
for i in range(n):
    sign = (-1)**i
    sine = sine + ((x**(2.0*i+1))/math.factorial(2*i+1))*sign
return sine

x = np.arange(-12,12,0.1)

anno = {
'text': '$\\sum_{k=0}^{\\infty} \\frac {(-1)^k x^{1+2k}}{(1 + 2k)!}$',
'x': 0.3, 'y': 0.6,'xref': "paper", 'yref': "paper",'showarrow': False,
'font':{'size':24}
}

l = {
'annotations': [anno], 
'title': 'Taylor series of sine',
'xaxis':{'ticks':'','linecolor':'white','showgrid':False,'zeroline':False},
'yaxis':{'ticks':'','linecolor':'white','showgrid':False,'zeroline':False},
'legend':{'font':{'size':16},'bordercolor':'white','bgcolor':'#fcfcfc'}
}

py.iplot([{'x':x, 'y':sin(x,1), 'line':{'color':'#e377c2'}, 'name':'$x\\\\$'},\
      {'x':x, 'y':sin(x,2), 'line':{'color':'#7f7f7f'},'name':'$ x-\\frac{x^3}{6}$'},\
      {'x':x, 'y':sin(x,3), 'line':{'color':'#bcbd22'},'name':'$ x-\\frac{x^3}{6}+\\frac{x^5}{120}$'},\
      {'x':x, 'y':sin(x,4), 'line':{'color':'#17becf'},'name':'$ x-\\frac{x^5}{120}$'}], layout=l)

This creates your graph, and allows you a chance to keep the legend within the plot itself. The default for the legend if it is not set is to place it in the plot, as shown here.

enter image description here

For an alternative placement, you can closely align the edge of the graph and border of the legend, and remove border lines for a closer fit.

enter image description here

You can move and re-style the legend and graph with code, or with the GUI. To shift the legend, you have the following options to position the legend inside the graph by assigning x and y values of <= 1. E.g :

{"x" : 0,"y" : 0} -- Bottom Left
{"x" : 1, "y" : 0} -- Bottom Right
{"x" : 1, "y" : 1} -- Top Right
{"x" : 0, "y" : 1} -- Top Left
{"x" :.5, "y" : 0} -- Bottom Center
{"x": .5, "y" : 1} -- Top Center

In this case, we choose the upper right, legendstyle = {"x" : 1, "y" : 1}, also described in the documentation:

enter image description here

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