Programs & Examples On #Freepascal

Free Pascal is a multi-dialect, multi-platform Object Pascal compiler. Originally started to replace the retired Turbo Pascal compiler, it now attempts to follow the Delphi dialect still being developed by Embarcadero Technologies. It has compiler modes for Delphi, Turbo Pascal and Mac Pascal. It also has two modes for it's own superset dialect. One with exceptions, classes and interfaces, and one without.

Escape single quote character for use in an SQLite query

I believe you'd want to escape by doubling the single quote:

INSERT INTO table_name (field1, field2) VALUES (123, 'Hello there''s');

jquery data selector

If you also use jQueryUI, you get a (simple) version of the :data selector with it that checks for the presence of a data item, so you can do something like $("div:data(view)"), or $( this ).closest(":data(view)").

See http://api.jqueryui.com/data-selector/ . I don't know for how long they've had it, but it's there now!

Best way to convert an ArrayList to a string

Would the following be any good:

List<String> streamValues = new ArrayList<>();
Arrays.deepToString(streamValues.toArray()));   

How do I undo the most recent local commits in Git?

Everybody comments in such a complicated manner.

If you want to remove the last commit from your branch, the simplest way to do it is:

git reset --hard HEAD~1

Now to actually push that change to get rid of your last commit, you have to

git push --force

And that's it. This will remove your last commit.

Remove multiple whitespaces

<?php
$str = "This is  a string       with
spaces, tabs and newlines present";

$stripped = preg_replace(array('/\s{2,}/', '/[\t\n]/'), ' ', $str);

echo $str;
echo "\n---\n";
echo "$stripped";
?>

This outputs

This is  a string   with
spaces, tabs and newlines present
---
This is a string with spaces, tabs and newlines present

How to change options of <select> with jQuery?

If for example your html code contain this code:

<select id="selectId"><option>Test1</option><option>Test2</option></select>

In order to change the list of option inside your select, you can use this code bellow. when your name select named selectId.

var option = $('<option></option>').attr("value", "option value").text("Text");
$("#selectId").html(option);

in this example above i change the old list of option by only one new option.

Java Calendar, getting current month value, clarification needed

Calendar.get takes as argument one of the standard Calendar fields, like YEAR or MONTH not a month name.

Calendar.JANUARY is 0, which is also the value of Calendar.ERA, so Calendar.getInstance().get(0) will return the era, in this case Calendar.AD, which is 1.

For the first part of your question, note that, as is wildly documented, months start at 0, so 10 is actually November.

Differences between strong and weak in Objective-C

A dummy answer :-

I think explanation is given in above answer, so i am just gonna tell you where to use STRONG and where to use WEAK :

Use of Weak :- 1. Delegates 2. Outlets 3. Subviews 4. Controls, etc.

Use of Strong :- Remaining everywhere which is not included in WEAK.

jquery $.each() for objects

$.each() works for objects and arrays both:

var data = { "programs": [ { "name":"zonealarm", "price":"500" }, { "name":"kaspersky", "price":"200" } ] };

$.each(data.programs, function (i) {
    $.each(data.programs[i], function (key, val) {
        alert(key + val);
    });
});

...and since you will get the current array element as second argument:

$.each(data.programs, function (i, currProgram) {
    $.each(currProgram, function (key, val) {
        alert(key + val);
    });
});

How to receive serial data using android bluetooth

I tried this out for transmitting continuous data (float values converted to string) from my PC (MATLAB) to my phone. But, still my App misreads the delimiter '\n' and still data gets garbled. So, I took the character 'N' as the delimiter rather than '\n' (it could be any character that doesn't occur as part of your data) and I've achieved better transmission speed - I gave just 0.1 seconds delay between transmitting successive samples - with more than 99% data integrity at the receiver i.e. out of 2000 samples (float values) that I transmitted, only 10 were not decoded properly in my application.

My answer in short is: Choose a delimiter other than '\r' or '\n' as these create more problems for real-time data transmission when compared to other characters like the one I've used. If we work more, may be we can increase the transmission rate even more. I hope my answer helps someone!

Declaring an HTMLElement Typescript

Okay: weird syntax!

var el: HTMLElement = document.getElementById('content');

fixes the problem. I wonder why the example didn't do this in the first place?

complete code:

class Greeter {
    element: HTMLElement;
    span: HTMLElement;
    timerToken: number;

    constructor (element: HTMLElement) { 
        this.element = element;
        this.element.innerText += "The time is: ";
        this.span = document.createElement('span');
        this.element.appendChild(this.span);
        this.span.innerText = new Date().toUTCString();
    }

    start() {
        this.timerToken = setInterval(() => this.span.innerText = new Date().toUTCString(), 500);
    }

    stop() {
        clearTimeout(this.timerToken);
    }

}

window.onload = () => {
    var el: HTMLElement = document.getElementById('content');
    var greeter = new Greeter(el);
    greeter.start();
};

ES6 modules in the browser: Uncaught SyntaxError: Unexpected token import

it worked for me adding type="module" to the script importing my mjs:

<script type="module">
import * as module from 'https://rawgit.com/abernier/7ce9df53ac9ec00419634ca3f9e3f772/raw/eec68248454e1343e111f464e666afd722a65fe2/mymod.mjs'

console.log(module.default()) // Prints: Hi from the default export!
</script>

See demo: https://codepen.io/abernier/pen/wExQaa

Styling input radio with css

See this Fiddle

<input type="radio" id="radio-2-1" name="radio-2-set" class="regular-radio" /><label for="radio-2-1"></label>
<input type="radio" id="radio-2-2" name="radio-2-set" class="regular-radio" /><label for="radio-2-2"></label>
<input type="radio" id="radio-2-3" name="radio-2-set" class="regular-radio" /><label for="radio-2-3"></label>

.regular-radio {
    display: none;
}

.regular-radio + label {
    -webkit-appearance: none;
    background-color: #e1e1e1;
    border: 4px solid #e1e1e1;
    border-radius: 10px;
    width: 100%;
    display: inline-block;
    position: relative;
    width: 10px;
    height: 10px;
}

.regular-radio:checked + label {
    background: grey;
    border: 4px solid #e1e1e1;
}

ORDER BY items must appear in the select list if SELECT DISTINCT is specified

While they are not the same thing, in one sense DISTINCT implies a GROUP BY, because every DISTINCT could be re-written using GROUP BY instead. With that in mind, it doesn't make sense to order by something that's not in the aggregate group.

For example, if you have a table like this:

col1  col2
----  ----
 1     1
 1     2
 2     1
 2     2
 2     3
 3     1

and then try to query it like this:

SELECT DISTINCT col1 FROM [table] WHERE col2 > 2 ORDER BY col1, col2

That would make no sense, because there could end up being multiple col2 values per row. Which one should it use for the order? Of course, in this query you know the results wouldn't be that way, but the database server can't know that in advance.

Now, your case is a little different. You included all the columns from the order by clause in the select clause, and therefore it would seem at first glance that they were all grouped. However, some of those columns were included in a calculated field. When you do that in combination with distinct, the distinct directive can only be applied to the final results of the calculation: it doesn't know anything about the source of the calculation any more.

This means the server doesn't really know it can count on those columns any more. It knows that they were used, but it doesn't know if the calculation operation might cause an effect similar to my first simple example above.

So now you need to do something else to tell the server that the columns are okay to use for ordering. There are several ways to do that, but this approach should work okay:

SELECT rsc.RadioServiceCodeId,
            rsc.RadioServiceCode + ' - ' + rsc.RadioService as RadioService
FROM sbi_l_radioservicecodes rsc
INNER JOIN sbi_l_radioservicecodegroups rscg 
    ON rsc.radioservicecodeid = rscg.radioservicecodeid
WHERE rscg.radioservicegroupid IN 
    (SELECT val FROM dbo.fnParseArray(@RadioServiceGroup,','))
    OR @RadioServiceGroup IS NULL  
GROUP BY rsc.RadioServiceCode,rsc.RadioServiceCodeId,rsc.RadioService
ORDER BY rsc.RadioServiceCode,rsc.RadioServiceCodeId,rsc.RadioService

Using "-Filter" with a variable

You don't need quotes around the variable, so simply change this:

Get-ADComputer -Filter {name -like '$nameregex' -and Enabled -eq "true"}

into this:

Get-ADComputer -Filter {name -like $nameregex -and Enabled -eq "true"}

Note, however, that the scriptblock notation for filter statements is misleading, because the statement is actually a string, so it's better to write it as such:

Get-ADComputer -Filter "name -like '$nameregex' -and Enabled -eq 'true'"

Related. Also related.

And FTR: you're using wildcard matching here (operator -like), not regular expressions (operator -match).

horizontal scrollbar on top and bottom of table

Expanding on StanleyH's answer, and trying to find the minimum required, here is what I implemented:

JavaScript (called once from somewhere like $(document).ready()):

function doubleScroll(){
        $(".topScrollVisible").scroll(function(){
            $(".tableWrapper")
                .scrollLeft($(".topScrollVisible").scrollLeft());
        });
        $(".tableWrapper").scroll(function(){
            $(".topScrollVisible")
                .scrollLeft($(".tableWrapper").scrollLeft());
        });
}

HTML (note that the widths will change the scroll bar length):

<div class="topScrollVisible" style="overflow-x:scroll">
    <div class="topScrollTableLength" style="width:1520px; height:20px">
    </div>
</div>
<div class="tableWrapper" style="overflow:auto; height:100%;">
    <table id="myTable" style="width:1470px" class="myTableClass">
...
    </table>

That's it.

Why the switch statement cannot be applied on strings?

The reason why has to do with the type system. C/C++ doesn't really support strings as a type. It does support the idea of a constant char array but it doesn't really fully understand the notion of a string.

In order to generate the code for a switch statement the compiler must understand what it means for two values to be equal. For items like ints and enums, this is a trivial bit comparison. But how should the compiler compare 2 string values? Case sensitive, insensitive, culture aware, etc ... Without a full awareness of a string this cannot be accurately answered.

Additionally, C/C++ switch statements are typically generated as branch tables. It's not nearly as easy to generate a branch table for a string style switch.

Change the column label? e.g.: change column "A" to column "Name"

I would like to present another answer to this as the currently accepted answer doesn't work for me (I use LibreOffice). This solution should work in Excel, LibreOffice and OpenOffice:

First, insert a new row at the beginning of the sheet. Within that row, define the names you need: new row

Then, in the menu bar, go to View -> Freeze Cells -> Freeze First Row. It'll look like this now: new top row

Now whenever you scroll down in the document, the first row will be "pinned" to the top: new behaviour

How do I make an input field accept only letters in javaScript?

Use onkeyup on the text box and check the keycode of the key pressed, if its between 65 and 90, allow else empty the text box.

com.jcraft.jsch.JSchException: UnknownHostKey

Depending on what program you use for ssh, the way to get the proper key could vary. Putty (popular with Windows) uses their own format for ssh keys. With most variants of Linux and BSD that I've seen, you just have to look in ~/.ssh/known_hosts. I usually ssh from a Linux machine and then copy this file to a Windows machine. Then I use something similar to

jsch.setKnownHosts("C:\\Users\\cabbott\\known_hosts");

Assuming I have placed the file in C:\Users\cabbott on my Windows machine. If you don't have access to a Linux machine, try http://www.cygwin.com/

Maybe someone else can suggest another Windows alternative. I find putty's way of handling SSH keys by storing them in the registry in a non-standard format bothersome to extract.

No visible cause for "Unexpected token ILLEGAL"

The error

When code is parsed by the JavaScript interpreter, it gets broken into pieces called "tokens". When a token cannot be classified into one of the four basic token types, it gets labelled "ILLEGAL" on most implementations, and this error is thrown.

The same error is raised if, for example, you try to run a js file with a rogue @ character, a misplaced curly brace, bracket, "smart quotes", single quotes not enclosed properly (e.g. this.run('dev1)) and so on.

A lot of different situations can cause this error. But if you don't have any obvious syntax error or illegal character, it may be caused by an invisible illegal character. That's what this answer is about.

But I can't see anything illegal!

There is an invisible character in the code, right after the semicolon. It's the Unicode U+200B Zero-width space character (a.k.a. ZWSP, HTML entity &#8203;). That character is known to cause the Unexpected token ILLEGAL JavaScript syntax error.

And where did it come from?

I can't tell for sure, but my bet is on jsfiddle. If you paste code from there, it's very likely to include one or more U+200B characters. It seems the tool uses that character to control word-wrapping on long strings.

UPDATE 2013-01-07

After the latest jsfiddle update, it's now showing the character as a red dot like codepen does. Apparently, it's also not inserting U+200B characters on its own anymore, so this problem should be less frequent from now on.

UPDATE 2015-03-17

Vagrant appears to sometimes cause this issue as well, due to a bug in VirtualBox. The solution, as per this blog post is to set sendfile off; in your nginx config, or EnableSendfile Off if you use Apache.

It's also been reported that code pasted from the Chrome developer tools may include that character, but I was unable to reproduce that with the current version (22.0.1229.79 on OSX).

How can I spot it?

The character is invisible, do how do we know it's there? You can ask your editor to show invisible characters. Most text editors have this feature. Vim, for example, displays them by default, and the ZWSP shows as <u200b>. You can also debug it online: jsbin displays the character as a red dot on its code panes (but seems to remove it after saving and reloading the page). CodePen.io also displays it as a dot, and keeps it even after saving.

Related problems

That character is not something bad, it can actually be quite useful. This example on Wikipedia demonstrates how it can be used to control where a long string should be wrapped to the next line. However, if you are unaware of the character's presence on your markup, it may become a problem. If you have it inside of a string (e.g., the nodeValue of a DOM element that has no visible content), you might expect such string to be empty, when in fact it's not (even after applying String.trim).

ZWSP can also cause extra whitespace to be displayed on an HTML page, for example when it's found between two <div> elements (as seen on this question). This case is not even reproducible on jsfiddle, since the character is ignored there.

Another potential problem: if the web page's encoding is not recognized as UTF-8, the character may actually be displayed (as ​ in latin1, for example).

If ZWSP is present on CSS code (inline code, or an external stylesheet), styles can also not be parsed properly, so some styles don't get applied (as seen on this question).

The ECMAScript Specification

I couldn't find any mention to that specific character on the ECMAScript Specification (versions 3 and 5.1). The current version mentions similar characters (U+200C and U+200D) on Section 7.1, which says they should be treated as IdentifierParts when "outside of comments, string literals, and regular expression literals". Those characters may, for example, be part of a variable name (and var x\u200c; indeed works).

Section 7.2 lists the valid White space characters (such as tab, space, no-break space, etc.), and vaguely mentions that any other Unicode “space separator” (category “Zs”) should be treated as white space. I'm probably not the best person to discuss the specs in this regard, but it seems to me that U+200B should be considered white space according to that, when in fact the implementations (at least Chrome and Firefox) appear to treat them as an unexpected token (or part of one), causing the syntax error.

How can I create Min stl priority_queue?

The third template parameter for priority_queue is the comparator. Set it to use greater.

e.g.

std::priority_queue<int, std::vector<int>, std::greater<int> > max_queue;

You'll need #include <functional> for std::greater.

How to make a node.js application run permanently?

Installation

$ [sudo] npm install forever -g

You can use forever to run scripts continuously

forever start server.js

forever list

for stop service

forever stop server.js

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve

If you have ever used a proxy, VPN, etc(or may not, I am not sure).....Then the solution below may help you...I don't know why (and if anybody can tell me why, I will appreciate that), but it works, pefectly. Have a try when you totally feel desperate about that issue.

Come to your project, and open gradle-wrapper.properties or gradle.properties, comment out these codes about proxy:

#systemProp.http.nonProxyHosts=118.89.144.241|47.112.105.125
#systemProp.http.proxyHost=127.0.0.1
#systemProp.http.proxyPort=1081
#systemProp.https.nonProxyHosts=118.89.144.241|47.112.105.125
#systemProp.https.proxyHost=127.0.0.1
#systemProp.https.proxyPort=1081

enter image description here

Then, it might work.

PS: I met this problem when I try to use dataBinding library, and when I added the code

buildFeatures {
        dataBinding true
    }

into gradle as the guide told me and Syns the project, I got such an error:"Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve ......". Finally I did what I described above, and I successed. What I experience may give you a hint, so I post the solution here and hope it might help.

CSS pseudo elements in React

Not a direct answer to the question, but this may help those who are having trouble creating style information using Typescript.

I was getting an error telling me that the following was incorrect:

let iconStyle = {
    position: 'relative',
    maxHeight: '90px',
    top: '25%',
}

The error told me that "types of property 'position' are incompatible". I have no idea why.

I fixed this by adding a strict Typescript declaration, like so:

let iconStyle: CSSProperties = {
    position: 'relative',
    maxHeight: '90px',
    top: '25%',
}

This works.

Test if a vector contains a given element

I really like grep() and grepl() for this purpose.

grep() returns a vector of integers, which indicate where matches are.

yo <- c("a", "a", "b", "b", "c", "c")

grep("b", yo)
[1] 3 4

grepl() returns a logical vector, with "TRUE" at the location of matches.

yo <- c("a", "a", "b", "b", "c", "c")

grepl("b", yo)
[1] FALSE FALSE  TRUE  TRUE FALSE FALSE

These functions are case-sensitive.

Outputting data from unit test in Python

I think I might have been overthinking this. One way I've come up with that does the job, is simply to have a global variable, that accumulates the diagnostic data.

Somthing like this:

log1 = dict()
class TestBar(unittest.TestCase):
    def runTest(self):
        for t1, t2 in testdata:
            f = Foo(t1) 
            if f.bar(t2) != 2: 
                log1("TestBar.runTest") = (f, t1, t2)
                self.fail("f.bar(t2) != 2")

Thanks for the replies. They have given me some alternative ideas for how to record information from unit tests in python.

Configure hibernate to connect to database via JNDI Datasource

I was getting the same error in my IBM Websphere with c3p0 jar files. I have Oracle 10g database. I simply added the oraclejdbc.jar files in the Application server JVM in IBM Classpath using Websphere Console and the error was resolved.

The oraclejdbc.jar should be set with your C3P0 jar files in your Server Class path whatever it be tomcat, glassfish of IBM.

Regex that accepts only numbers (0-9) and NO characters

Your regex ^[0-9] matches anything beginning with a digit, including strings like "1A". To avoid a partial match, append a $ to the end:

^[0-9]*$

This accepts any number of digits, including none. To accept one or more digits, change the * to +. To accept exactly one digit, just remove the *.

UPDATE: You mixed up the arguments to IsMatch. The pattern should be the second argument, not the first:

if (!System.Text.RegularExpressions.Regex.IsMatch(textbox.Text, "^[0-9]*$"))

CAUTION: In JavaScript, \d is equivalent to [0-9], but in .NET, \d by default matches any Unicode decimal digit, including exotic fare like ? (Myanmar 2) and ? (N'Ko 9). Unless your app is prepared to deal with these characters, stick with [0-9] (or supply the RegexOptions.ECMAScript flag).

How to Get enum item name from its value

You can define an operator that performs the output.

std::ostream& operator<<(std::ostream& lhs, WeekEnum e) {
    switch(e) {
    case Monday: lhs << "Monday"; break;
    .. etc
    }
    return lhs;
}

Reduce git repository size

git gc --aggressive is one way to force the prune process to take place (to be sure: git gc --aggressive --prune=now). You have other commands to clean the repo too. Don't forget though, sometimes git gc alone can increase the size of the repo!

It can be also used after a filter-branch, to mark some directories to be removed from the history (with a further gain of space); see here. But that means nobody is pulling from your public repo. filter-branch can keep backup refs in .git/refs/original, so that directory can be cleaned too.

Finally, as mentioned in this comment and this question; cleaning the reflog can help:

git reflog expire --all --expire=now
git gc --prune=now --aggressive

An even more complete, and possibly dangerous, solution is to remove unused objects from a git repository


Update Feb. 2021, eleven years later: the new git maintenance command (man page) should supersede git gc, and can be scheduled.

Run a single migration file

Method 1 :

rake db:migrate:up VERSION=20080906120000

Method 2:

In Rails Console 1. Copy paste the migration class in console (say add_name_to_user.rb) 2. Then in console, type the following

Sharding.run_on_all_shards{AddNameToUser.up}

It is done!!

What's the whole point of "localhost", hosts and ports at all?

Some databases are designed to communicate over the web using ports assigned by the Internet Assigned Number Authority (IANA) and when run on individual PC use the ports with localhost. Some common databases with their default ports (the defualts can usually be overridden):

Port Database

1433 Microsoft SQL Server https://support.microsoft.com/en-us/kb/287932

3306 MySQL https://dev.mysql.com/doc/refman/4.1/en/connecting.html

5432 PostgreSQL

1527 Apache Derby (database)

Some web servers and databases are paired together such as Apache/MySQL (as in LAMP or XXAMP) or MS Internet Information Server (IIS)/MS SQL Server (IIS/SQL Server) in which case you have to be concerned with both the port of the database and the web server -- a common example of this is WordPress which uses Apache/MySQL.

Set background colour of cell to RGB value of data in cell

Setting the Color property alone will guarantee an exact match. Excel 2003 can only handle 56 colors at once. The good news is that you can assign any rgb value at all to those 56 slots (which are called ColorIndexs). When you set a cell's color using the Color property this causes Excel to use the nearest "ColorIndex". Example: Setting a cell to RGB 10,20,50 (or 3281930) will actually cause it to be set to color index 56 which is 51,51,51 (or 3355443).

If you want to be assured you got an exact match, you need to change a ColorIndex to the RGB value you want and then change the Cell's ColorIndex to said value. However you should be aware that by changing the value of a color index you change the color of all cells already using that color within the workbook. To give an example, Red is ColorIndex 3. So any cell you made Red you actually made ColorIndex 3. And if you redefine ColorIndex 3 to be say, purple, then your cell will indeed be made purple, but all other red cells in the workbook will also be changed to purple.

There are several strategies to deal with this. One way is to choose an index not yet in use, or just one that you think will not be likely to be used. Another way is to change the RGB value of the nearest ColorIndex so your change will be subtle. The code I have posted below takes this approach. Taking advantage of the knowledge that the nearest ColorIndex is assigned, it assigns the RGB value directly to the cell (thereby yielding the nearest color) and then assigns the RGB value to that index.

Sub Example()
    Dim lngColor As Long
    lngColor = RGB(10, 20, 50)
    With Range("A1").Interior
        .Color = lngColor
        ActiveWorkbook.Colors(.ColorIndex) = lngColor
    End With
End Sub

How to select all records from one table that do not exist in another table?

I don't have enough rep points to vote up froadie's answer. But I have to disagree with the comments on Kris's answer. The following answer:

SELECT name
FROM table2
WHERE name NOT IN
    (SELECT name 
     FROM table1)

Is FAR more efficient in practice. I don't know why, but I'm running it against 800k+ records and the difference is tremendous with the advantage given to the 2nd answer posted above. Just my $0.02.

Remove legend ggplot 2.2

If your chart uses both fill and color aesthetics, you can remove the legend with:

+ guides(fill=FALSE, color=FALSE)

Return value from exec(@sql)

that's my procedure

CREATE PROC sp_count
    @CompanyId sysname,
    @codition sysname
    AS
    SET NOCOUNT ON
    CREATE TABLE #ctr
    ( NumRows int )

    DECLARE @intCount int
         , @vcSQL varchar(255)

    SELECT    @vcSQL = ' INSERT #ctr FROM dbo.Comm_Services 
                       WHERE CompanyId = '+@CompanyId+' and '+@condition+')'
    EXEC      (@vcSQL)

    IF @@ERROR = 0
    BEGIN
         SELECT    @intCount = NumRows
         FROM #ctr

         DROP TABLE #ctr
         RETURN @intCount
    END
    ELSE
    BEGIN
         DROP TABLE #ctr
         RETURN -1
    END
    GO

Best tool for inspecting PDF files?

Adobe Acrobat has a very cool but rather well hidden mode allowing you to inspect PDF files. I wrote a blog article explaining it at https://blog.idrsolutions.com/2009/04/viewing-pdf-objects/

jquery-ui-dialog - How to hook into dialog close event

add option 'close' like under sample and do what you want inline function

close: function(e){
    //do something
}

fs: how do I locate a parent folder?

this will also work:

fs.readFile(`${__dirname}/../../foo.bar`);

How to extract or unpack an .ab file (Android Backup file)

I have had to unpack a .ab-file, too and found this post while looking for an answer. My suggested solution is Android Backup Extractor, a free Java tool for Windows, Linux and Mac OS.

Make sure to take a look at the README, if you encounter a problem. You might have to download further files, if your .ab-file is password-protected.

Usage:
java -jar abe.jar [-debug] [-useenv=yourenv] unpack <backup.ab> <backup.tar> [password]

Example:

Let's say, you've got a file test.ab, which is not password-protected, you're using Windows and want the resulting .tar-Archive to be called test.tar. Then your command should be:

java.exe -jar abe.jar unpack test.ab test.tar ""

Reading file input from a multipart/form-data POST

I've had some issues with parser that are based on string parsing particularly with large files I found it would run out of memory and fail to parse binary data.

To cope with these issues I've open sourced my own attempt at a C# multipart/form-data parser here

Features:

  • Handles very large files well. (Data is streamed in and streamed out while reading)
  • Can handle multiple file uploads and automatically detects if a section is a file or not.
  • Returns files as a stream not as a byte[] (good for large files).
  • Full documentation for the library including a MSDN-style generated website.
  • Full unit tests.

Restrictions:

  • Doesn't handle non-multipart data.
  • Code is more complicated then Lorenzo's

Just use the MultipartFormDataParser class like so:

Stream data = GetTheStream();

// Boundary is auto-detected but can also be specified.
var parser = new MultipartFormDataParser(data, Encoding.UTF8);

// The stream is parsed, if it failed it will throw an exception. Now we can use
// your data!

// The key of these maps corresponds to the name field in your
// form
string username = parser.Parameters["username"].Data;
string password = parser.Parameters["password"].Data

// Single file access:
var file = parser.Files.First();
string filename = file.FileName;
Stream data = file.Data;

// Multi-file access
foreach(var f in parser.Files)
{
    // Do stuff with each file.
}

In the context of a WCF service you could use it like this:

public ResponseClass MyMethod(Stream multipartData)
{
    // First we need to get the boundary from the header, this is sent
    // with the HTTP request. We can do that in WCF using the WebOperationConext:
    var type = WebOperationContext.Current.IncomingRequest.Headers["Content-Type"];

    // Now we want to strip the boundary out of the Content-Type, currently the string
    // looks like: "multipart/form-data; boundary=---------------------124123qase124"
    var boundary = type.Substring(type.IndexOf('=')+1);

    // Now that we've got the boundary we can parse our multipart and use it as normal
    var parser = new MultipartFormDataParser(data, boundary, Encoding.UTF8);

    ...
}

Or like this (slightly slower but more code friendly):

public ResponseClass MyMethod(Stream multipartData)
{
    var parser = new MultipartFormDataParser(data, Encoding.UTF8);
}

Documentation is also available, when you clone the repository simply navigate to HttpMultipartParserDocumentation/Help/index.html

Unable to load script.Make sure you are either running a Metro server or that your bundle 'index.android.bundle' is packaged correctly for release

Starting with Android 9.0 (API level 28), cleartext support is disabled by default.

This is what you need to do to get rid of this problem if you do normal run commands properly

  1. npm install
  2. react-native start
  3. react-native run-android

And modify your android manifest file like this.

<application
    android:name=".MainApplication"
    android:icon="@mipmap/ic_launcher"
    android:usesCleartextTraffic="true" // add this line with TRUE Value.
android:theme="@style/AppTheme">

C# declare empty string array

Arrays' constructors are different. Here are some ways to make an empty string array:

var arr = new string[0];
var arr = new string[]{};
var arr = Enumerable.Empty<string>().ToArray()

(sorry, on mobile)

Extracting substrings in Go

Go strings are not null terminated, and to remove the last char of a string you can simply do:

s = s[:len(s)-1]

Unable instantiate android.gms.maps.MapFragment

i had everything what everyone above was saying and resolved the error by simply calling the super.onCreate(savedInstanceState); as first instruction in oncreate method; before it was last line in method. :| wasted whole day.

Batch file to delete folders older than 10 days in Windows 7

Adapted from this answer to a very similar question:

FORFILES /S /D -10 /C "cmd /c IF @isdir == TRUE rd /S /Q @path"

You should run this command from within your d:\study folder. It will delete all subfolders which are older than 10 days.

The /S /Q after the rd makes it delete folders even if they are not empty, without prompting.

I suggest you put the above command into a .bat file, and save it as d:\study\cleanup.bat.

ERROR Error: No value accessor for form control with unspecified name attribute on switch

I had this same error, I had a input field named control in my custom Form Component but was accidentally passing control in input named formControl. Hope no one faces that issue.

Find all controls in WPF Window by type

I found that the line, VisualTreeHelper.GetChildrenCount(depObj);, used in several examples above does not return a non-zero count for GroupBoxes, in particular, where the GroupBox contains a Grid, and the Grid contains children elements. I believe this may be because the GroupBox is not allowed to contain more than one child, and this is stored in its Content property. There is no GroupBox.Children type of property. I am sure I did not do this very efficiently, but I modified the first "FindVisualChildren" example in this chain as follows:

public IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject 
{ 
    if (depObj != null) 
    {
        int depObjCount = VisualTreeHelper.GetChildrenCount(depObj); 
        for (int i = 0; i <depObjCount; i++) 
        { 
            DependencyObject child = VisualTreeHelper.GetChild(depObj, i); 
            if (child != null && child is T) 
            { 
                yield return (T)child; 
            }

            if (child is GroupBox)
            {
                GroupBox gb = child as GroupBox;
                Object gpchild = gb.Content;
                if (gpchild is T)
                {
                    yield return (T)child; 
                    child = gpchild as T;
                }
            }

            foreach (T childOfChild in FindVisualChildren<T>(child)) 
            { 
                yield return childOfChild; 
            } 
        }
    }
} 

Angular CLI Error: The serve command requires to be run in an Angular project, but a project definition could not be found

You can update the angular with command 'ng update --all'. It will take time but make sure your all components are up to date.

Detect & Record Audio in Python

The pyaudio website has many examples that are pretty short and clear: http://people.csail.mit.edu/hubert/pyaudio/

Update 14th of December 2019 - Main example from the above linked website from 2017:


"""PyAudio Example: Play a WAVE file."""

import pyaudio
import wave
import sys

CHUNK = 1024

if len(sys.argv) < 2:
    print("Plays a wave file.\n\nUsage: %s filename.wav" % sys.argv[0])
    sys.exit(-1)

wf = wave.open(sys.argv[1], 'rb')

p = pyaudio.PyAudio()

stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),
                channels=wf.getnchannels(),
                rate=wf.getframerate(),
                output=True)

data = wf.readframes(CHUNK)

while data != '':
    stream.write(data)
    data = wf.readframes(CHUNK)

stream.stop_stream()
stream.close()

p.terminate()

Bootstrap 3 collapse accordion: collapse all works but then cannot expand all while maintaining data-parent

The best and tested solution is to put the following small snippet which will collapse the accordion tab which is already open when you load. In my case the last sixth tab was open so I made it collapsed on page load.

 $(document).ready(){
      $('#collapseSix').collapse("hide");
 }

MySQL : ERROR 1215 (HY000): Cannot add foreign key constraint

It's worth noting that this error can also happen if the target table or column you're using in the REFERENCES portion simply doesn't exist.

Preserve Line Breaks From TextArea When Writing To MySQL

function breakit($t) {
    return nl2br(htmlentities($t, ENT_QUOTES, 'UTF-8'));
}

this may help you

pass the textarea wal

What's the difference between KeyDown and KeyPress in .NET?

I've always thought keydown happened as soon as you press the key down, keypress is the action of pressing the key and releasing it.

I found this which gives a little different explanation: http://bytes.com/topic/net/answers/649131-difference-keypress-keydown-event

Create a new object from type parameter in generic class

This is what I do to retain type info:

class Helper {
   public static createRaw<T>(TCreator: { new (): T; }, data: any): T
   {
     return Object.assign(new TCreator(), data);
   }
   public static create<T>(TCreator: { new (): T; }, data: T): T
   {
      return this.createRaw(TCreator, data);
   }
}

...

it('create helper', () => {
    class A {
        public data: string;
    }
    class B {
        public data: string;
        public getData(): string {
            return this.data;
        }
    }
    var str = "foobar";

    var a1 = Helper.create<A>(A, {data: str});
    expect(a1 instanceof A).toBeTruthy();
    expect(a1.data).toBe(str);

    var a2 = Helper.create(A, {data: str});
    expect(a2 instanceof A).toBeTruthy();
    expect(a2.data).toBe(str);

    var b1 = Helper.createRaw(B, {data: str});
    expect(b1 instanceof B).toBeTruthy();
    expect(b1.data).toBe(str);
    expect(b1.getData()).toBe(str);

});

Bootstrap 3 Glyphicons are not working

IIS will not server .woff files by default, so in IIS you'll need to add a <mimeMap> entry to your web.config file;

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <staticContent>
            <mimeMap fileExtension=".woff" mimeType="application/x-woff" />
        </staticContent>
    </system.webServer>
</configuration>

How to convert an entire MySQL database characterset and collation to UTF-8?

To change the character set encoding to UTF-8 follow simple steps in PHPMyAdmin

  1. Select your Database SS

  2. Go To Operations SS

  3. In operations tab, on the bottom collation drop down menu, select you desire encoding i.e(utf8_general_ci), and also check the checkbox (1)change all table collations, (2) Change all tables columns collations. and hit Go.

SS

Encrypt & Decrypt using PyCrypto AES 256

Here is my implementation and works for me with some fixes and enhances the alignment of the key and secret phrase with 32 bytes and iv to 16 bytes:

import base64
import hashlib
from Crypto import Random
from Crypto.Cipher import AES

class AESCipher(object):

    def __init__(self, key): 
        self.bs = AES.block_size
        self.key = hashlib.sha256(key.encode()).digest()

    def encrypt(self, raw):
        raw = self._pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return base64.b64encode(iv + cipher.encrypt(raw.encode()))

    def decrypt(self, enc):
        enc = base64.b64decode(enc)
        iv = enc[:AES.block_size]
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return self._unpad(cipher.decrypt(enc[AES.block_size:])).decode('utf-8')

    def _pad(self, s):
        return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)

    @staticmethod
    def _unpad(s):
        return s[:-ord(s[len(s)-1:])]

sys.argv[1], IndexError: list index out of range

I've done some research and it seems that the sys.argv might require an argument at the command line when running the script

Not might, but definitely requires. That's the whole point of sys.argv, it contains the command line arguments. Like any python array, accesing non-existent element raises IndexError.

Although the code uses try/except to trap some errors, the offending statement occurs in the first line.

So the script needs a directory name, and you can test if there is one by looking at len(sys.argv) and comparing to 1+number_of_requirements. The argv always contains the script name plus any user supplied parameters, usually space delimited but the user can override the space-split through quoting. If the user does not supply the argument, your choices are supplying a default, prompting the user, or printing an exit error message.

To print an error and exit when the argument is missing, add this line before the first use of sys.argv:

if len(sys.argv)<2:
    print "Fatal: You forgot to include the directory name on the command line."
    print "Usage:  python %s <directoryname>" % sys.argv[0]
    sys.exit(1)

sys.argv[0] always contains the script name, and user inputs are placed in subsequent slots 1, 2, ...

see also:

Working with UTF-8 encoding in Python source

Do not forget to verify if your text editor encodes properly your code in UTF-8.

Otherwise, you may have invisible characters that are not interpreted as UTF-8.

TypeScript - Append HTML to container element in Angular 2

There is a better solution to this answer that is more Angular based.

  1. Save your string in a variable in the .ts file

    MyStrings = ["one","two","three"]

  2. In the html file use *ngFor.

    <div class="one" *ngFor="let string of MyStrings; let i = index"> <div class="two">{{string}}</div> </div>

  3. if you want to dynamically insert the div element, just push more strings into the MyStrings array

    myFunction(nextString){ this.MyString.push(nextString) }

this way every time you click the button containing the myFunction(nextString) you effectively add another class="two" div which acts the same way as inserting it into the DOM with pure javascript.

How to replace list item in best way

You could make it more readable and more efficient:

string oldValue = valueFieldValue.ToString();
string newValue = value.ToString();
int index = listofelements.IndexOf(oldValue);
if(index != -1)
    listofelements[index] = newValue;

This asks only once for the index. Your approach uses Contains first which needs to loop all items(in the worst case), then you're using IndexOf which needs to enumerate the items again .

How do I add a Fragment to an Activity with a programmatically created content view

This may help you

Defining a Fragment

create xml file for fragment view fragment_abc.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView" />

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button" />

</LinearLayout>

create fragment ABCFragment.java

import androidx.fragment.app.Fragment;

public class FooFragment extends Fragment {
// The onCreateView method is called when Fragment should create its View object hierarchy,
// either dynamically or via XML layout inflation. 

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle 
savedInstanceState) {
    // Defines the xml file for the fragment
    return inflater.inflate(R.layout.fragment_abc, parent, false);
}

// This event is triggered soon after onCreateView().
// Any view setup should occur here.  E.g., view lookups and attaching view listeners.
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    // Setup any handles to view objects here
    // EditText etFoo = (EditText) view.findViewById(R.id.etFoo);
}
}

Add frameLayout in your activity

<FrameLayout
   android:id="@+id/your_placeholder"
   android:layout_width="match_parent"
   android:layout_height="match_parent">

now in activity, add following method

protected void setFragment() {
    // Begin the transaction
    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    // Replace the contents of the container with the new fragment
    ft.replace(R.id.fragment_container, new ABCFragment());
    // or ft.add(R.id.your_placeholder, new ABCFragment());
    // Complete the changes added above
    ft.commit();
}

reference : https://guides.codepath.com/android/creating-and-using-fragments#defining-a-fragment

Cannot find R.layout.activity_main

Ivwd simply removed line "import android.R;" and call Project->Clean... That was enough for my on Win-7/x64 and Eclipse Kepler and last (02.2014) Android SDK

How do I search a Perl array for a matching string?

For just a boolean match result or for a count of occurrences, you could use:

use 5.014; use strict; use warnings;
my @foo=('hello', 'world', 'foo', 'bar', 'hello world', 'HeLlo');
my $patterns=join(',',@foo);
for my $str (qw(quux world hello hEllO)) {
    my $count=map {m/^$str$/i} @foo;
    if ($count) {
        print "I found '$str' $count time(s) in '$patterns'\n";
    } else {
        print "I could not find '$str' in the pattern list\n"
    };
}

Output:

I could not find 'quux' in the pattern list
I found 'world' 1 time(s) in 'hello,world,foo,bar,hello world,HeLlo'
I found 'hello' 2 time(s) in 'hello,world,foo,bar,hello world,HeLlo'
I found 'hEllO' 2 time(s) in 'hello,world,foo,bar,hello world,HeLlo'

Does not require to use a module.
Of course it's less "expandable" and versatile as some code above.
I use this for interactive user answers to match against a predefined set of case unsensitive answers.

SQL Server 2008 - IF NOT EXISTS INSERT ELSE UPDATE

As others have suggested that you should look into MERGE statement but nobody provided a solution using it I'm adding my own answer with this particular TSQL construct. I bet you'll like it.

Important note

Your code has a typo in your if statement in not exists(select...) part. Inner select statement has only one where condition while UserName condition is excluded from the not exists due to invalid brace completion. In any case you cave too many closing braces.

I assume this based on the fact that you're using two where conditions in update statement later on in your code.

Let's continue to my answer...

SQL Server 2008+ support MERGE statement

MERGE statement is a beautiful TSQL gem very well suited for "insert or update" situations. In your case it would look similar to the following code. Take into consideration that I'm declaring variables what are likely stored procedure parameters (I suspect).

declare @clockDate date = '08/10/2012';
declare @userName = 'test';

merge Clock as target
using (select @clockDate, @userName) as source (ClockDate, UserName)
on (target.ClockDate = source.ClockDate and target.UserName = source.UserName)
when matched then
    update
    set BreakOut = getdate()
when not matched then
    insert (ClockDate, UserName, BreakOut)
    values (getdate(), source.UserName, getdate());

Create a list from two object lists with linq

You need something like a full outer join. System.Linq.Enumerable has no method that implements a full outer join, so we have to do it ourselves.

var dict1 = list1.ToDictionary(l1 => l1.Name);
var dict2 = list2.ToDictionary(l2 => l2.Name);
    //get the full list of names.
var names = dict1.Keys.Union(dict2.Keys).ToList();
    //produce results
var result = names
.Select( name =>
{
  Person p1 = dict1.ContainsKey(name) ? dict1[name] : null;
  Person p2 = dict2.ContainsKey(name) ? dict2[name] : null;
      //left only
  if (p2 == null)
  {
    p1.Change = 0;
    return p1;
  }
      //right only
  if (p1 == null)
  {
    p2.Change = 0;
    return p2;
  }
      //both
  p2.Change = p2.Value - p1.Value;
  return p2;
}).ToList();

Programmatically Creating UILabel

UILabel *lbl1 = [[UILabel alloc] init];
/*important--------- */lbl1.textColor = [UIColor blackColor];
[lbl1 setFrame:position];
lbl1.backgroundColor=[UIColor clearColor];
lbl1.textColor=[UIColor whiteColor];
lbl1.userInteractionEnabled=NO;
lbl1.text= @"TEST";
[self.view addSubview:lbl1];

Invalid column count in CSV input on line 1 Error

I got the same error when importing a .csv file using phpMyAdmin.

Solution to my problem was that my computer saved the .csv file with ; (semi-colon) as delimiter instead of , (commas).

In the Format-Specific Options you can however chose "columns separated:" and select ; instead of , (comma).

In order to see what your computer stores the file in, open the .csv file in an text editor.

Convert Date format into DD/MMM/YYYY format in SQL Server

Try using the below query.

SELECT REPLACE(CONVERT(VARCHAR(11),GETDATE(),6), ' ','/');  

Result: 20/Jun/13

SELECT REPLACE(CONVERT(VARCHAR(11),GETDATE(),106), ' ','/');  

Result: 20/Jun/2013

Scroll to element on click in Angular 4

I have done something like what you're asking just by using jQuery to find the element (such as document.getElementById(...)) and using the .focus() call.

How to Delete node_modules - Deep Nested Folder in Windows

What worked for me was:

  1. closed the node manager console
  2. closed the Atom (visual studio code ) dev environment you are in.
  3. then delete the node_modules

    npm install rimraf -g 
    rimraf node_modules
    

String formatting in Python 3

I like this approach

my_hash = {}
my_hash["goals"] = 3 #to show number
my_hash["penalties"] = "5" #to show string
print("I scored %(goals)d goals and took %(penalties)s penalties" % my_hash)

Note the appended d and s to the brackets respectively.

output will be:

I scored 3 goals and took 5 penalties

Is it possible to style html5 audio tag?

Yes, it's possible, from @Fábio Zangirolami answer

audio::-webkit-media-controls-panel, video::-webkit-media-controls-panel {
                background-color: red;
}

How to use a servlet filter in Java to change an incoming servlet request url?

  1. Implement javax.servlet.Filter.
  2. In doFilter() method, cast the incoming ServletRequest to HttpServletRequest.
  3. Use HttpServletRequest#getRequestURI() to grab the path.
  4. Use straightforward java.lang.String methods like substring(), split(), concat() and so on to extract the part of interest and compose the new path.
  5. Use either ServletRequest#getRequestDispatcher() and then RequestDispatcher#forward() to forward the request/response to the new URL (server-side redirect, not reflected in browser address bar), or cast the incoming ServletResponse to HttpServletResponse and then HttpServletResponse#sendRedirect() to redirect the response to the new URL (client side redirect, reflected in browser address bar).
  6. Register the filter in web.xml on an url-pattern of /* or /Check_License/*, depending on the context path, or if you're on Servlet 3.0 already, use the @WebFilter annotation for that instead.

Don't forget to add a check in the code if the URL needs to be changed and if not, then just call FilterChain#doFilter(), else it will call itself in an infinite loop.

Alternatively you can also just use an existing 3rd party API to do all the work for you, such as Tuckey's UrlRewriteFilter which can be configured the way as you would do with Apache's mod_rewrite.

Can not run Java Applets in Internet Explorer 11 using JRE 7u51

For Windows 8.1 Users.... there is a little note on the java download site which says:

"Downloading and installing Java will only work in Desktop mode on Windows 8 and Windows 8.1. See the Java on Windows 8 FAQ for more detailed information."

Unfortunately, "Desktop mode" is not the default mode in Windows 8.1. After installing java and wasting 2hours trying to get java working with IE11, I went back to oracles site...paid a bit more attention to that warning!! switched to Desktop mode, and reinstalled java... hey presto it worked.

Furious, that java download does not work with the default config of Windows 8.1, don't know who to be more angry with? Oracle or Microsoft? ( or me for skimming over the warning..)

What are alternatives to ExtJS?

Nothing compares to in terms of community size and presence on StackOverflow. Despite previous controversy, Ext JS now has a GPLv3 open source license. Its learning curve is long, but it can be quite rewarding once learned. Ext JS lacks a Material Design theme, and the team has repeatedly refused to release the source code on GitHub. For mobile, one must use the separate Sencha Touch library.

Have in mind also that,

large JavaScript libraries, such as YUI, have been receiving less attention from the community. Many developers today look at large JavaScript libraries as walled gardens they don’t want to be locked into.

-- Announcement of YUI development being ceased

That said, below are a number of Ext JS alternatives currently available.

Leading client widget libraries

  1. Blueprint is a React-based UI toolkit developed by big data analytics company Palantir in TypeScript, and "optimized for building complex data-dense interfaces for desktop applications". Actively developed on GitHub as of May 2019, with comprehensive documentation. Components range from simple (chips, toast, icons) to complex (tree, data table, tag input with autocomplete, date range picker. No accordion or resizer.

    Blueprint targets modern browsers (Chrome, Firefox, Safari, IE 11, and Microsoft Edge) and is licensed under a modified Apache license.

    Sandbox / demoGitHubDocs

  2. Webix - an advanced, easy to learn, mobile-friendly, responsive and rich free&open source JavaScript UI components library. Webix spun off from DHTMLX Touch (a project with 8 years of development behind it - see below) and went on to become a standalone UI components framework. The GPL3 edition allows commercial use and lets non-GPL applications using Webix keep their license, e.g. MIT, via a license exemption for FLOSS. Webix has 55 UI widgets, including trees, grids, treegrids and charts. Funding comes from a commercial edition with some advanced widgets (Pivot, Scheduler, Kanban, org chart etc.). Webix has an extensive list of free and commercial widgets, and integrates with most popular frameworks (React, Vue, Meteor, etc) and UI components.

    Webix

    Skins look modern, and include a Material Design theme. The Touch theme also looks quite Material Design-ish. See also the Skin Builder.

    Minimal GitHub presence, but includes the library code, and the documentation (which still needs major improvements). Webix suffers from a having a small team and a lack of marketing. However, they have been responsive to user feedback, both on GitHub and on their forum.

    The library was lean (128Kb gzip+minified for all 55 widgets as of ~2015), faster than ExtJS, dojo and others, and the design is pleasant-looking. The current version of Webix (v6, as of Nov 2018) got heavier (400 - 676kB minified but NOT gzipped).

    The demos on Webix.com look and function great. The developer, XB Software, uses Webix in solutions they build for paying customers, so there's likely a good, funded future ahead of it.

    Webix aims for backwards compatibility down to IE8, and as a result carries some technical debt.

    WikipediaGitHubPlayground/sandboxAdmin dashboard demoDemosWidget samples

  3. react-md - MIT-licensed Material Design UI components library for React. Responsive, accessible. Implements components from simple (buttons, cards) to complex (sortable tables, autocomplete, tags input, calendars). One lead author, ~1900 GitHub stars.

  4. - jQuery-based UI toolkit with 40+ basic open-source widgets, plus commercial professional widgets (grids, trees, charts etc.). Responsive&mobile support. Works with Bootstrap and AngularJS. Modern, with Material Design themes. The documentation is available on GitHub, which has enabled numerous contributions from users (4500+ commits, 500+ PRs as of Jan 2015).

    enter image description here

    Well-supported commercially, claiming millions of developers, and part of a large family of developer tools. Telerik has received many accolades, is a multi-national company (Bulgaria, US), was acquired by Progress Software, and is a thought leader.

    A Kendo UI Professional developer license costs $700 and posting access to most forums is conditioned upon having a license or being in the trial period.

    [Wikipedia] • GitHub/TelerikDemosPlaygroundTools

  5. OpenUI5 - jQuery-based UI framework with 180 widgets, Apache 2.0-licensed and fully-open sourced and funded by German software giant SAP SE.

    OpenUI5

    The community is much larger than that of Webix, SAP is hiring developers to grow OpenUI5, and they presented OpenUI5 at OSCON 2014.

    The desktop themes are rather lackluster, but the Fiori design for web and mobile looks clean and neat.

    WikipediaGitHubMobile-first controls demosDesktop controls demosSO

  6. DHTMLX - JavaScript library for building rich Web and Mobile apps. Looks most like ExtJS - check the demos. Has been developed since 2005 but still looks modern. All components except TreeGrid are available under GPLv2 but advanced features for many components are only available in the commercial PRO edition - see for example the tree. Claims to be used by many Fortune 500 companies.

    DHTMLX

    Minimal presence on GitHub (the main library code is missing) and StackOverflow but active forum. The documentation is not available on GitHub, which makes it difficult to improve by the community.

  7. Polymer, a Web Components polyfill, plus Polymer Paper, Google's implementation of the Material design. Aimed at web and mobile apps. Doesn't have advanced widgets like trees or even grids but the controls it provides are mobile-first and responsive. Used by many big players, e.g. IBM or USA Today.

    Polymer Paper Elements

  8. Ant Design claims it is "a design language for background applications", influenced by "nature" and helping designers "create low-entropy atmosphere for developer team". That's probably a poor translation from Chinese for "UI components for enterprise web applications". It's a React UI library written in TypeScript, with many components, from simple (buttons, cards) to advanced (autocomplete, calendar, tag input, table).

    The project was born in China, is popular with Chinese companies, and parts of the documentation are available only in Chinese. Quite popular on GitHub, yet it makes the mistake of splitting the community into Chinese and English chat rooms. The design looks Material-ish, but fonts are small and the information looks lost in a see of whitespace.

  9. PrimeUI - collection of 45+ rich widgets based on jQuery UI. Apache 2.0 license. Small GitHub community. 35 premium themes available.

  10. qooxdoo - "a universal JavaScript framework with a coherent set of individual components", developed and funded by German hosting provider 1&1 (see the contributors, one of the world's largest hosting companies. GPL/EPL (a business-friendly license).

    Mobile themes look modern but desktop themes look old (gradients).

    Qooxdoo

    WikipediaGitHubWeb/Mobile/Desktop demosWidgets Demo browserWidget browserSOPlaygroundCommunity

  11. jQuery UI - easy to pick up; looks a bit dated; lacks advanced widgets. Of course, you can combine it with independent widgets for particular needs, e.g. trees or other UI components, but the same can be said for any other framework.

  12. + Angular UI. While Angular is backed by Google, it's being radically revamped in the upcoming 2.0 version, and "users will need to get to grips with a new kind of architecture. It's also been confirmed that there will be no migration path from Angular 1.X to 2.0". Moreover, the consensus seems to be that Angular 2 won't really be ready for use until a year or two from now. Angular UI has relatively few widgets (no trees, for example).

  13. DojoToolkit and their powerful Dijit set of widgets. Completely open-sourced and actively developed on GitHub, but development is now (Nov 2018) focused on the new dojo.io framework, which has very few basic widgets. BSD/AFL license. Development started in 2004 and the Dojo Foundation is being sponsored by IBM, Google, and others - see Wikipedia. 7500 questions here on SO.

    Dojo Dijit

    Themes look desktop-oriented and dated - see the theme tester in dijit. The official theme previewer is broken and only shows "Claro". A Bootstrap theme exists, which looks a lot like Bootstrap, but doesn't use Bootstrap classes. In Jan 2015, I started a thread on building a Material Design theme for Dojo, which got quite popular within the first hours. However, there are questions regarding building that theme for the current Dojo 1.10 vs. the next Dojo 2.0. The response to that thread shows an active and wide community, covering many time zones.

    Unfortunately, Dojo has fallen out of popularity and fewer companies appear to use it, despite having (had?) a strong foothold in the enterprise world. In 2009-2012, its learning curve was steep and the documentation needed improvements; while the documentation has substantially improved, it's unclear how easy it is to pick up Dojo nowadays.

    With a Material Design theme, Dojo (2.0?) might be the killer UI components framework.

    WikipediaGitHubThemesDemosDesktop widgetsSO

  14. Enyo - front-end library aimed at mobile and TV apps (e.g. large touch-friendly controls). Developed by LG Electronix and Apache-licensed on GitHub.

  15. The radical Cappuccino - Objective-J (a superset of JavaScript) instead of HTML+CSS+DOM

  16. Mochaui, MooTools UI Library User Interface Library. <300 GitHub stars.

  17. CrossUI - cross-browser JS framework to develop and package the exactly same code and UI into Web Apps, Native Desktop Apps (Windows, OS X, Linux) and Mobile Apps (iOS, Android, Windows Phone, BlackBerry). Open sourced LGPL3. Featured RAD tool (form builder etc.). The UI looks desktop-, not web-oriented. Actively developed, small community. No presence on GitHub.

  18. ZinoUI - simple widgets. The DataTable, for instance, doesn't even support sorting.

  19. Wijmo - good-looking commercial widgets, with old (jQuery UI) widgets open-sourced on GitHub (their development stopped in 2013). Developed by ComponentOne, a division of GrapeCity. See Wijmo Complete vs. Open.

  20. CxJS - commercial JS framework based on React, Babel and webpack offering form elements, form validation, advanced grid control, navigational elements, tooltips, overlays, charts, routing, layout support, themes, culture dependent formatting and more.

CxJS

Widgets - Demo Apps - Examples - GitHub

Full-stack frameworks

  1. SproutCore - developed by Apple for web applications with native performance, handling large data sets on the client. Powers iCloud.com. Not intended for widgets.

  2. Wakanda: aimed at business/enterprise web apps - see What is Wakanda?. Architecture:

  3. Servoy - "a cross platform frontend development and deployment environment for SQL databases". Boasts a "full WYSIWIG (What You See Is What You Get) UI designer for HTML5 with built-in data-binding to back-end services", responsive design, support for HTML6 Web Components, Websockets and mobile platforms. Written in Java and generates JavaScript code using various JavaBeans.

  4. SmartClient/SmartGWT - mobile and cross-browser HTML5 UI components combined with a Java server. Aimed at building powerful business apps - see demos.

  5. Vaadin - full-stack Java/GWT + JavaScript/HTML3 web app framework

  6. Backbase - portal software

  7. Shiny - front-end library on top R, with visualization, layout and control widgets

  8. ZKOSS: Java+jQuery+Bootstrap framework for building enterprise web and mobile apps.

CSS libraries + minimal widgets

These libraries don't implement complex widgets such as tables with sorting/filtering, autocompletes, or trees.

  1. Bootstrap

  2. Foundation for Apps - responsive front-end framework on top of AngularJS; more of a grid/layout/navigation library

  3. UI Kit - similar to Bootstrap, with fewer widgets, but with official off-canvas.

Libraries using HTML Canvas

Using the canvas elements allows for complete control over the UI, and great cross-browser compatibility, but comes at the cost of missing native browser functionality, e.g. page search via Ctrl/Cmd+F.

  1. Zebra - demos

No longer developed as of Dec 2014

  1. Yahoo! User Interface - YUI, launched in 2005, but no longer maintained by the core contributors - see the announcement, which highlights reasons why large UI widget libraries are perceived as walled gardens that developers don't want to be locked into.
  2. echo3, GitHub. Supports writing either server-side Java applications that don't require developer knowledge of HTML, HTTP, or JavaScript, or client-side JavaScript-based applications do not require a server, but can communicate with one via AJAX. Last update: July 2013.
  3. ampleSDK
  4. Simpler widgets livepipe.net
  5. JxLib
  6. rialto
  7. Simple UI kit
  8. Prototype-ui

Other lists

Getting a 500 Internal Server Error on Laravel 5+ Ubuntu 14.04

Make sure a .env file, containing an APP_KEY, exists in root.

What should be in the .env hasn't been explicitly stated in other solutions, and thought I'd boil it down to the sentence above.

This fixed my 500 error on a fresh install of Laravel.

Steps:

  1. Create a .env file in root (e.g. touch .env)
  2. Make sure it contains at least one line: APP_KEY=
  3. Generate an app key in terminal: php artisan key:generate

Notes:

  • My particular installation didn't include any .env whatsoever (example or otherwise)

  • Simply having a blank .env does not work.

  • A .env containing parameters, but no APP_KEY parameter, does not work.

Bug?: When generating an app key in terminal, it may report as successful, however no key will actually get placed in the .env if the file has no pre-existing APP_KEY= line.

As a reference, here's the official .env with useful baseline parameters. Copy-paste what you need:

https://github.com/laravel/laravel/blob/master/.env.example

XSLT - How to select XML Attribute by Attribute?

I would do it by creating a variable that points to the nodes that have the proper value in Value1 then referring to t

<xsl:variable name="myVarANode" select="root//DataSet/Data[@Value1='2']" />
<xsl:value-of select="$myVarANode/@Value2"/>

Everyone else's answers are right too - more right in fact since I didn't notice the extra slash in your XPATH that would mess things up. Still, this will also work , and might work for different things, so keep this method in your toolbox.

R - argument is of length zero in if statement

The argument is of length zero takes places when you get an output as an integer of length 0 and not a NULL output.i.e., integer(0).

You can further verify my point by finding the class of your output- >class(output) "integer"

HTTP vs HTTPS performance

The overhead is NOT due to the encryption. On a modern CPU, the encryption required by SSL is trivial.

The overhead is due to the SSL handshakes, which are lengthy and drastically increase the number of round-trips required for a HTTPS session over a HTTP one.

Measure (using a tool such as Firebug) the page load times while the server is on the end of a simulated high-latency link. Tools exist to simulate a high latency link - for Linux there is "netem". Compare HTTP with HTTPS on the same setup.

The latency can be mitigated to some extent by:

  • Ensuring that your server is using HTTP keepalives - this allows the client to reuse SSL sessions, which avoids the need for another handshake
  • Reducing the number of requests to as few as possible - by combining resources where possible (e.g. .js include files, CSS) and encouraging client-side caching
  • Reduce the number of page loads, e.g. by loading data not required into the page (perhaps in a hidden HTML element) and then showing it using client-script.

php: how to get associative array key from numeric index?

You might do it this way:

function asoccArrayValueWithNumKey(&$arr, $key) {
   if (!(count($arr) > $key)) return false;
   reset($array);
   $aux   = -1;
   $found = false;
   while (($auxKey = key($array)) && !$found) {
      $aux++;
      $found = ($aux == $key);
   }
   if ($found) return $array[$auxKey];
   else return false;
}

$val = asoccArrayValueWithNumKey($array, 0);
$val = asoccArrayValueWithNumKey($array, 1);
etc...

Haven't tryed the code, but i'm pretty sure it will work.

Good luck!

Make javascript alert Yes/No Instead of Ok/Cancel

"Confirm" in Javascript stops the whole process until it gets a mouse response on its buttons. If that is what you are looking for, you can refer jquery-ui but if you have nothing running behind your process while receiving the response and you control the flow programatically, take a look at this. You will have to hard-code everything by yourself but you have complete command over customization. https://www.w3schools.com/howto/howto_css_modals.asp

Using external images for CSS custom cursors

Originally from a Codepen pen by Chris Coyier of Codepen/CSS-Tricks

_x000D_
_x000D_
.auto            { cursor: auto; }
.default         { cursor: default; }
.none            { cursor: none; }
.context-menu    { cursor: context-menu; }
.help            { cursor: help; }
.pointer         { cursor: pointer; }
.progress        { cursor: progress; }
.wait            { cursor: wait; }
.cell            { cursor: cell; }
.crosshair       { cursor: crosshair; }
.text            { cursor: text; }
.vertical-text   { cursor: vertical-text; }
.alias           { cursor: alias; }
.copy            { cursor: copy; }
.move            { cursor: move; }
.no-drop         { cursor: no-drop; }
.not-allowed     { cursor: not-allowed; }
.all-scroll      { cursor: all-scroll; }
.col-resize      { cursor: col-resize; }
.row-resize      { cursor: row-resize; }
.n-resize        { cursor: n-resize; }
.e-resize        { cursor: e-resize; }
.s-resize        { cursor: s-resize; }
.w-resize        { cursor: w-resize; }
.ns-resize       { cursor: ns-resize; }
.ew-resize       { cursor: ew-resize; }
.ne-resize       { cursor: ne-resize; }
.nw-resize       { cursor: nw-resize; }
.se-resize       { cursor: se-resize; }
.sw-resize       { cursor: sw-resize; }
.nesw-resize     { cursor: nesw-resize; }
.nwse-resize     { cursor: nwse-resize; }

body {
  text-align: center;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

}
.cursors {
  display: flex;
  flex-wrap: wrap;
}
.cursors > div {
  flex: 150px;
  padding: 10px 2px;
  white-space: nowrap;
  border: 1px solid #eee;
  border-radius: 5px;
  margin: 0 5px 5px 0;
}
.cursors > div:hover {
  background: #eee;
}

HTML CSSResult
EDIT ON
.svg {
  cursor: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/9632/heart.svg), auto;
}

.svg-base64 {
  cursor: url(data:text/html;base64,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), auto;
}

.png-base64 {
  cursor: url("data:image/png;base64,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"), auto;
}

.png {
  cursor: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/9632/heart.png"), auto;
}

.gif {
  cursor: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/9632/tina.gif"), auto;
}

.cursors {
  display: flex;
  justify-content: flex-start;
  align-items: stretch;
  height: 100vh;
}

.cursors > div {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-grow: 1;
  box-sizing: border-box;
  padding: 10px 2px;
  text-align: center;
}
_x000D_
<h1>The Cursors of CSS</h1>

<div class="cursors">
    <div class="auto">auto</div>
    <div class="default">default</div>
    <div class="none">none</div>
    <div class="context-menu">context-menu</div>
    <div class="help">help</div>
    <div class="pointer">pointer</div>
    <div class="progress">progress</div>
    <div class="wait">wait</div>
    <div class="cell">cell</div>
    <div class="crosshair">crosshair</div>
    <div class="text">text</div>
    <div class="vertical-text">vertical-text</div>
    <div class="alias">alias</div>
    <div class="copy">copy</div>
    <div class="move">move</div>
    <div class="no-drop">no-drop</div>
    <div class="not-allowed">not-allowed</div>
    <div class="all-scroll">all-scroll</div>
    <div class="col-resize">col-resize</div>
    <div class="row-resize">row-resize</div>
    <div class="n-resize">n-resize</div>
    <div class="s-resize">s-resize</div>
    <div class="e-resize">e-resize</div>
    <div class="w-resize">w-resize</div>
    <div class="ns-resize">ns-resize</div>
    <div class="ew-resize">ew-resize</div>
    <div class="ne-resize">ne-resize</div>
    <div class="nw-resize">nw-resize</div>
    <div class="se-resize">se-resize</div>
    <div class="sw-resize">sw-resize</div>
    <div class="nesw-resize">nesw-resize</div>
    <div class="nwse-resize">nwse-resize</div>
</div>
<br><br><br><br><br><br><br><br><br>
<h1>Custom Image</h1>
<div class="cursors">
  <div class="svg"><p>SVG</p></div>
  <div class="svg-base64">Base 64 SVG</div>
  <div class="png-base64">Base 64 PNG</div>
  <div class="png">PNG</div>
  <div class="gif">GIF</div>
</div>
_x000D_
_x000D_
_x000D_

Android - drawable with rounded corners at the top only

Try giving these values:

 <corners android:topLeftRadius="6dp" android:topRightRadius="6dp"
         android:bottomLeftRadius="0.1dp" android:bottomRightRadius="0.1dp"/>

Note that I have changed 0dp to 0.1dp.

EDIT: See Aleks G comment below for a cleaner version

How to create a new component in Angular 4 using CLI

Make sure you are in your project directory in the CMD line

    ng g component componentName

jquery dialog save cancel button styling

after looking at some other threads I came up with this solution to add icons to the buttons in a confirm dialog, which seems to work well in version 1.8.1 and can be modified to do other styling:

$("#confirmBox").dialog({
    modal:true,
    autoOpen:false,        
    buttons: { 
        "Save": function() { ... },                
        "Cancel": function() { ... }
        }
});

var buttons = $('.ui-dialog-buttonpane').children('button');
buttons.removeClass('ui-button-text-only').addClass('ui-button-text-icon');

$(buttons[0]).append("<span class='ui-icon ui-icon-check'></span>");
$(buttons[1]).append("<span class='ui-icon ui-icon-close'></span>");

I'd be interested in seeing if there was a better way to do it, but this seems pretty efficient.

Angular, Http GET with parameter?

An easy and usable way to solve this problem

getGetSuppor(filter): Observale<any[]> {
   return this.https.get<any[]>('/api/callCenter/getSupport' + '?' + this.toQueryString(filter));
}

private toQueryString(query): string {
   var parts = [];
   for (var property in query) {
     var value = query[propery];
     if (value != null && value != undefined)
        parts.push(encodeURIComponent(propery) + '=' + encodeURIComponent(value))
   }
   
   return parts.join('&');
}

Add new item in existing array in c#.net

Why not try out using the Stringbuilder class. It has methods such as .insert and .append. You can read more about it here: http://msdn.microsoft.com/en-us/library/2839d5h5(v=vs.71).aspx

Format date as dd/MM/yyyy using pipes

Angular: 8.2.11

<td>{{ data.DateofBirth | date }}</td>

Output: Jun 9, 1973

<td>{{ data.DateofBirth | date: 'dd/MM/yyyy' }}</td>

Output: 09/06/1973

<td>{{ data.DateofBirth | date: 'dd/MM/yyyy hh:mm a' }}</td>

Output: 09/06/1973 12:00 AM

How do you implement a re-try-catch?

Give it a try using springs @Retryable annotation , the below method will retry for 3 attempts when RuntimeException occurs

@Retryable(maxAttempts=3,value= {RuntimeException.class},backoff = @Backoff(delay = 500))
public void checkSpringRetry(String str) {
    if(StringUtils.equalsIgnoreCase(str, "R")) {
        LOGGER.info("Inside retry.....!!");
        throw new RuntimeException();
    }
}

Export SQL query data to Excel

I see that you’re trying to export SQL data to Excel to avoid copy-pasting your very large data set into Excel.

You might be interested in learning how to export SQL data to Excel and update the export automatically (with any SQL database: MySQL, Microsoft SQL Server, PostgreSQL).

To export data from SQL to Excel, you need to follow 2 steps:

  • Step 1: Connect Excel to your SQL database? (Microsoft SQL Server, MySQL, PostgreSQL...)
  • Step 2: Import your SQL data into Excel

The result will be the list of tables you want to query data from your SQL database into Excel:

?

Step1: Connect Excel to an external data source: your SQL database

  1. Install An ODBC
  2. Install A Driver
  3. Avoid A Common Error
  4. Create a DSN

Step 2: Import your SQL data into Excel

  1. Click Where You Want Your Pivot Table
  2. Click Insert
  3. Click Pivot Table
  4. Click Use an external data source, then Choose Connection
  5. Click on the System DSN tab
  6. Select the DSN created in ODBC Manager
  7. Fill the requested username and password
  8. Avoid a Common Error
  9. Access The Microsoft Query Dialog Box
  10. Click on the arrow to see the list of tables in your database
  11. Select the table you want to query data from your SQL database into Excel
  12. Click on Return Data when you’re done with your selection

To update the export automatically, there are 2 additional steps:

  1. Create a Pivot Table with an external SQL data source
  2. Automate Your SQL Data Update In Excel With The GETPIVOTDATA Function

I’ve created a step-by-step tutorial about this whole process, from connecting Excel to SQL, up to having the whole thing automatically updated. You might find the detailed explanations and screenshots useful.

appending list but error 'NoneType' object has no attribute 'append'

I think what you want is this:

last_list=[]
if p.last_name != None and p.last_name != "":
    last_list.append(p.last_name)
print last_list

Your current if statement:

if p.last_name == None or p.last_name == "":
    pass

Effectively never does anything. If p.last_name is none or the empty string, it does nothing inside the loop. If p.last_name is something else, the body of the if statement is skipped.

Also, it looks like your statement pan_list.append(p.last) is a typo, because I see neither pan_list nor p.last getting used anywhere else in the code you have posted.

How to use ArrayAdapter<myClass>

You could just add a toString() method to MyClass, per http://developer.android.com/reference/android/widget/ArrayAdapter.html:

However the TextView is referenced, it will be filled with the toString() of each object in the array. You can add lists or arrays of custom objects. Override the toString() method of your objects to determine what text will be displayed for the item in the list.

class MyClass {

 @Override
 public String toString() {
  return "Hello, world.";
 }
}

How to get the employees with their managers

This is a classic self-join, try the following:

SELECT e.ename, e.empno, m.ename as manager, e.mgr
FROM
    emp e, emp m
WHERE e.mgr = m.empno

And if you want to include the president which has no manager then instead of an inner join use an outer join in Oracle syntax:

SELECT e.ename, e.empno, m.ename as manager, e.mgr
FROM
    emp e, emp m
WHERE e.mgr = m.empno(+)

Or in ANSI SQL syntax:

SELECT e.ename, e.empno, m.ename as manager, e.mgr
FROM
    emp e
    LEFT OUTER JOIN emp m
        ON e.mgr = m.empno

"End of script output before headers" error in Apache

Had the same error on raspberry-pi. I fixed it by adding -w to the shebang

#!/usr/bin/perl -w

Multiple lines of input in <input type="text" />

If you are using React, the library material-ui.com can help you with:

  <FormControl>
    <InputLabel htmlFor="textContract">{`textContract`}</InputLabel>
    <Input
      id="textContract"
      multiline
      rows="30"
      type="text"
      value={props.textContract}
      onChange={() => {}}
    />
  </FormControl>

https://material-ui.com/components/text-fields/#multiline

What does /p mean in set /p?

For future reference, you can get help for any command by using the /? switch, which should explain what switches do what.

According to the set /? screen, the format for set /p is SET /P variable=[promptString] which would indicate that the p in /p is "prompt." It just prints in your example because <nul passes in a nul character which immediately ends the prompt so it just acts like it's printing. It's still technically prompting for input, it's just immediately receiving it.

/L in for /L generates a List of numbers.

From ping /?:

Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
            [-r count] [-s count] [[-j host-list] | [-k host-list]]
            [-w timeout] [-R] [-S srcaddr] [-4] [-6] target_name

Options:
    -t             Ping the specified host until stopped.
                   To see statistics and continue - type Control-Break;
                   To stop - type Control-C.
    -a             Resolve addresses to hostnames.
    -n count       Number of echo requests to send.
    -l size        Send buffer size.
    -f             Set Don't Fragment flag in packet (IPv4-only).
    -i TTL         Time To Live.
    -v TOS         Type Of Service (IPv4-only. This setting has been deprecated
                   and has no effect on the type of service field in the IP Header).
    -r count       Record route for count hops (IPv4-only).
    -s count       Timestamp for count hops (IPv4-only).
    -j host-list   Loose source route along host-list (IPv4-only).
    -k host-list   Strict source route along host-list (IPv4-only).
    -w timeout     Timeout in milliseconds to wait for each reply.
    -R             Use routing header to test reverse route also (IPv6-only).
    -S srcaddr     Source address to use.
    -4             Force using IPv4.
    -6             Force using IPv6.

Angular (4, 5, 6, 7) - Simple example of slide in out animation on ngIf

I answered a very similar question, and here is a way of doing this :

First, create a file where you would define your animations and export them. Just to make it more clear in your app.component.ts

In the following example, I used a max-height of the div that goes from 0px (when it's hidden), to 500px, but you would change that according to what you need.

This animation uses states (in and out), that will be toggle when we click on the button, which will run the animtion.

animations.ts

import { trigger, state, style, transition,
    animate, group, query, stagger, keyframes
} from '@angular/animations';

export const SlideInOutAnimation = [
    trigger('slideInOut', [
        state('in', style({
            'max-height': '500px', 'opacity': '1', 'visibility': 'visible'
        })),
        state('out', style({
            'max-height': '0px', 'opacity': '0', 'visibility': 'hidden'
        })),
        transition('in => out', [group([
            animate('400ms ease-in-out', style({
                'opacity': '0'
            })),
            animate('600ms ease-in-out', style({
                'max-height': '0px'
            })),
            animate('700ms ease-in-out', style({
                'visibility': 'hidden'
            }))
        ]
        )]),
        transition('out => in', [group([
            animate('1ms ease-in-out', style({
                'visibility': 'visible'
            })),
            animate('600ms ease-in-out', style({
                'max-height': '500px'
            })),
            animate('800ms ease-in-out', style({
                'opacity': '1'
            }))
        ]
        )])
    ]),
]

Then in your app.component, we import the animation and create the method that will toggle the animation state.

app.component.ts

import { SlideInOutAnimation } from './animations';

@Component({
  ...
  animations: [SlideInOutAnimation]
})
export class AppComponent  {
  animationState = 'in';

  ...

  toggleShowDiv(divName: string) {
    if (divName === 'divA') {
      console.log(this.animationState);
      this.animationState = this.animationState === 'out' ? 'in' : 'out';
      console.log(this.animationState);
    }
  }
}

And here is how your app.component.html would look like :

<div class="wrapper">
  <button (click)="toggleShowDiv('divA')">TOGGLE DIV</button>
  <div [@slideInOut]="animationState" style="height: 100px; background-color: red;">
  THIS DIV IS ANIMATED</div>
  <div class="content">THIS IS CONTENT DIV</div>
</div>

slideInOut refers to the animation trigger defined in animations.ts

Here is a StackBlitz example I have created : https://angular-muvaqu.stackblitz.io/

Side note : If an error ever occurs and asks you to add BrowserAnimationsModule, just import it in your app.module.ts:

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

@NgModule({
  imports: [ ..., BrowserAnimationsModule ],
  ...
})

Getting list of items inside div using Selenium Webdriver

I'm not sure if your findElements statement gets you all the divs. I would try the following:

List<WebElement> elementsRoot = driver.findElements(By.xpath("//div[@class=\"facetContainerDiv\"]/div));

for(int i = 0; i < elementsRoot.size(); ++i) {
     WebElement checkbox = elementsRoot.get(i).findElement(By.xpath("./label/input"));
     checkbox.click();
     blah blah blah
}

The idea here is that you get the root element then use another a 'sub' xpath or any selector you like to find the node element. Of course the xpath or selector may need to be adjusted to properly find the element you want.

How to use greater than operator with date?

Try this.

SELECT * FROM la_schedule WHERE `start_date` > '2012-11-18';

center image in div with overflow hidden

this seems to work on our site, using your ideas and a little math based upon the left edge of wrapper div. It seems redundant to go left 50% then take out 50% extra margin, but it seems to work.

div.ImgWrapper {
    width: 160px;
    height: 160px
    overflow: hidden;
    text-align: center;
}

img.CropCenter {
    left: 50%;
    margin-left: -100%;
    position: relative;
    width: auto !important;
    height: 160px !important;
}

<div class="ImgWrapper">
<a href="#"><img class="CropCenter" src="img.png"></a>
</div>

Volatile boolean vs AtomicBoolean

You can't do compareAndSet, getAndSet as atomic operation with volatile boolean (unless of course you synchronize it).

Round up to Second Decimal Place in Python

x = math.ceil(x * 100.0) / 100.0

How to convert integer timestamp to Python datetime

datetime.datetime.fromtimestamp() is correct, except you are probably having timestamp in miliseconds (like in JavaScript), but fromtimestamp() expects Unix timestamp, in seconds.

Do it like that:

>>> import datetime
>>> your_timestamp = 1331856000000
>>> date = datetime.datetime.fromtimestamp(your_timestamp / 1e3)

and the result is:

>>> date
datetime.datetime(2012, 3, 16, 1, 0)

Does it answer your question?

EDIT: J.F. Sebastian correctly suggested to use true division by 1e3 (float 1000). The difference is significant, if you would like to get precise results, thus I changed my answer. The difference results from the default behaviour of Python 2.x, which always returns int when dividing (using / operator) int by int (this is called floor division). By replacing the divisor 1000 (being an int) with the 1e3 divisor (being representation of 1000 as float) or with float(1000) (or 1000. etc.), the division becomes true division. Python 2.x returns float when dividing int by float, float by int, float by float etc. And when there is some fractional part in the timestamp passed to fromtimestamp() method, this method's result also contains information about that fractional part (as the number of microseconds).

How to let PHP to create subdomain automatically for each user?

Don't fuss around with .htaccess files when you can use Apache mass virtual hosting.

From the documentation:

#include part of the server name in the filenames VirtualDocumentRoot /www/hosts/%2/docs

In a way it's the reverse of your question: every 'subdomain' is a user. If the user does not exist, you get an 404.

The only drawback is that the environment variable DOCUMENT_ROOT is not correctly set to the used subdirectory, but the default document_root in de htconfig.

How to remove symbols from a string with Python?

I often just open the console and look for the solution in the objects methods. Quite often it's already there:

>>> a = "hello ' s"
>>> dir(a)
[ (....) 'partition', 'replace' (....)]
>>> a.replace("'", " ")
'hello   s'

Short answer: Use string.replace().

How to post ASP.NET MVC Ajax form using JavaScript rather than submit button

I'm going to assume that your lack of quotes around the selector is just a transcription error, but you should check it anyway. Also, I don't see where you are actually giving the form an id. Usually you do this with the htmlAttributes parameter. I don't see you using the signature that has it. Again, though, if the form is submitting at all, this could be a transcription error.

If the selector and the id aren't the problem I'm suspicious that it might be because the click handler is added via markup when you use the Ajax BeginForm extension. You might try using $('form').trigger('submit') or in the worst case, have the click handler on the anchor create a hidden submit button in the form and click it. Or even create your own ajax submission using pure jQuery (which is probably what I would do).

Lastly, you should realize that by replacing the submit button, you're going to totally break this for people who don't have javascript enabled. The way around this is to also have a button hidden using a noscript tag and handle both AJAX and non-AJAX posts on the server.

BTW, it's consider standard practice, Microsoft not withstanding, to add the handlers via javascript not via markup. This keeps your javascript organized in one place so you can more easily see what's going on on the form. Here's an example of how I would use the trigger mechanism.

  $(function() {
      $('form#ajaxForm').find('a.submit-link').click( function() {
           $('form#ajaxForm').trigger('submit');
      }).show();
  }

<% using (Ajax.BeginForm("Update", "Description", new { id = Model.Id },
     new AjaxOptions
     {
       UpdateTargetId = "DescriptionDiv",
       HttpMethod = "post"
     }, new { id = "ajaxForm" } )) {%>
   Description:
   <%= Html.TextBox("Description", Model.Description) %><br />
   <a href="#" class="submit-link" style="display: none;">Save</a>
   <noscript>
       <input type="submit" value="Save" />
   </noscript>
<% } %>

Shell - Write variable contents to a file

If I understood you right, you want to copy $var in a file (if it's a string).

echo $var > $destdir

How do I print a list of "Build Settings" in Xcode project?

You can also get this information from the command line using the xcodebuild command with the -showBuildSettings switch:

$ xcodebuild -project myProj.xcodeproj -target "myTarg" -showBuildSettings

This will dump a list like the one shown above to the standard output.

Standard concise way to copy a file in Java?

  • These methods are performance-engineered (they integrate with operating system native I/O).
  • These methods work with files, directories and links.
  • Each of the options supplied may be left out - they are optional.

The utility class

package com.yourcompany.nio;

class Files {

    static int copyRecursive(Path source, Path target, boolean prompt, CopyOptions options...) {
        CopyVisitor copyVisitor = new CopyVisitor(source, target, options).copy();
        EnumSet<FileVisitOption> fileVisitOpts;
        if (Arrays.toList(options).contains(java.nio.file.LinkOption.NOFOLLOW_LINKS) {
            fileVisitOpts = EnumSet.noneOf(FileVisitOption.class) 
        } else {
            fileVisitOpts = EnumSet.of(FileVisitOption.FOLLOW_LINKS);
        }
        Files.walkFileTree(source[i], fileVisitOpts, Integer.MAX_VALUE, copyVisitor);
    }

    private class CopyVisitor implements FileVisitor<Path>  {
        final Path source;
        final Path target;
        final CopyOptions[] options;

        CopyVisitor(Path source, Path target, CopyOptions options...) {
             this.source = source;  this.target = target;  this.options = options;
        };

        @Override
        FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
        // before visiting entries in a directory we copy the directory
        // (okay if directory already exists).
        Path newdir = target.resolve(source.relativize(dir));
        try {
            Files.copy(dir, newdir, options);
        } catch (FileAlreadyExistsException x) {
            // ignore
        } catch (IOException x) {
            System.err.format("Unable to create: %s: %s%n", newdir, x);
            return SKIP_SUBTREE;
        }
        return CONTINUE;
    }

    @Override
    public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
        Path newfile= target.resolve(source.relativize(file));
        try {
            Files.copy(file, newfile, options);
        } catch (IOException x) {
            System.err.format("Unable to copy: %s: %s%n", source, x);
        }
        return CONTINUE;
    }

    @Override
    public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
        // fix up modification time of directory when done
        if (exc == null && Arrays.toList(options).contains(COPY_ATTRIBUTES)) {
            Path newdir = target.resolve(source.relativize(dir));
            try {
                FileTime time = Files.getLastModifiedTime(dir);
                Files.setLastModifiedTime(newdir, time);
            } catch (IOException x) {
                System.err.format("Unable to copy all attributes to: %s: %s%n", newdir, x);
            }
        }
        return CONTINUE;
    }

    @Override
    public FileVisitResult visitFileFailed(Path file, IOException exc) {
        if (exc instanceof FileSystemLoopException) {
            System.err.println("cycle detected: " + file);
        } else {
            System.err.format("Unable to copy: %s: %s%n", file, exc);
        }
        return CONTINUE;
    }
}

Copying a directory or file

long bytes = java.nio.file.Files.copy( 
                 new java.io.File("<filepath1>").toPath(), 
                 new java.io.File("<filepath2>").toPath(),
                 java.nio.file.StandardCopyOption.REPLACE_EXISTING,
                 java.nio.file.StandardCopyOption.COPY_ATTRIBUTES,
                 java.nio.file.LinkOption.NOFOLLOW_LINKS);

Moving a directory or file

long bytes = java.nio.file.Files.move( 
                 new java.io.File("<filepath1>").toPath(), 
                 new java.io.File("<filepath2>").toPath(),
                 java.nio.file.StandardCopyOption.ATOMIC_MOVE,
                 java.nio.file.StandardCopyOption.REPLACE_EXISTING);

Copying a directory or file recursively

long bytes = com.yourcompany.nio.Files.copyRecursive( 
                 new java.io.File("<filepath1>").toPath(), 
                 new java.io.File("<filepath2>").toPath(),
                 java.nio.file.StandardCopyOption.REPLACE_EXISTING,
                 java.nio.file.StandardCopyOption.COPY_ATTRIBUTES
                 java.nio.file.LinkOption.NOFOLLOW_LINKS );

Difference between java.exe and javaw.exe

java.exe is the console app while javaw.exe is windows app (console-less). You can't have Console with javaw.exe.

How to get the Enum Index value in C#

Another way to convert an Enum-Type to an int:

enum E
{
    A = 1,   /* index 0 */
    B = 2,   /* index 1 */
    C = 4,   /* index 2 */
    D = 4    /* index 3, duplicate use of 4 */
}

void Main()
{
    E e = E.C;
    int index = Array.IndexOf(Enum.GetValues(e.GetType()), e);
    // index is 2

    E f = (E)(Enum.GetValues(e.GetType())).GetValue(index);
    // f is  E.C
}

More complex but independent from the INT values assigned to the enum values.

matplotlib error - no module named tkinter

If you are using python 3.6, this worked for me:

sudo apt-get install python3.6-tk

instead of

sudo apt-get install python3-tk

Which works for other versions of python3

Eclipse Java error: This selection cannot be launched and there are no recent launches

Eclipse needs to see a main method in one of your project's source files in order to determine what kind of project it is so that it can offer the proper run options:

public static void main(String[] args)

Without that method signature (or with a malformed version of that method signature), the Run As menu item will not present any run options.

How to obtain values of request variables using Python and Flask

If you want to retrieve POST data:

first_name = request.form.get("firstname")

If you want to retrieve GET (query string) data:

first_name = request.args.get("firstname")

Or if you don't care/know whether the value is in the query string or in the post data:

first_name = request.values.get("firstname") 

request.values is a CombinedMultiDict that combines Dicts from request.form and request.args.

How to target the href to div

Try this code in jquery

$(document).ready(function(){
  $("a").click(function(){
  var id=$(this).attr('href');
  var value=$(id).text();
  $(".target").text(value);
  });
});

C# Ignore certificate errors?

To further expand on BIGNUM's post - Ideally you want a solution that will simulate the conditions you will see in production and modifying your code won't do that and could be dangerous if you forget to take the code out before you deploy it.

You will need a self-signed certificate of some sort. If you know what you're doing you can use the binary BIGNUM posted, but if not you can go hunting for the certificate. If you're using IIS Express you will have one of these already, you'll just have to find it. Open Firefox or whatever browser you like and go to your dev website. You should be able to view the certificate information from the URL bar and depending on your browser you should be able to export the certificate to a file.

Next, open MMC.exe, and add the Certificate snap-in. Import your certificate file into the Trusted Root Certificate Authorities store and that's all you should need. It's important to make sure it goes into that store and not some other store like 'Personal'. If you're unfamiliar with MMC or certificates, there are numerous websites with information how to do this.

Now, your computer as a whole will implicitly trust any certificates that it has generated itself and you won't need to add code to handle this specially. When you move to production it will continue to work provided you have a proper valid certificate installed there. Don't do this on a production server - that would be bad and it won't work for any other clients other than those on the server itself.

Convert char* to string C++

std::string str;
char* const s = "test";

str.assign(s);

string& assign (const char* s); => signature FYR

Reference/s here.

How do I print a datetime in the local timezone?

I believe the best way to do this is to use the LocalTimezone class defined in the datetime.tzinfo documentation (goto http://docs.python.org/library/datetime.html#tzinfo-objects and scroll down to the "Example tzinfo classes" section):

Assuming Local is an instance of LocalTimezone

t = datetime.datetime(2009, 7, 10, 18, 44, 59, 193982, tzinfo=utc)
local_t = t.astimezone(Local)

then str(local_t) gives:

'2009-07-11 04:44:59.193982+10:00'

which is what you want.

(Note: this may look weird to you because I'm in New South Wales, Australia which is 10 or 11 hours ahead of UTC)

How to run iPhone emulator WITHOUT starting Xcode?

is it helpful to you see the image enter image description here

Edit

Now with new Xcode if the icon of the Xcode is on dock you can just right click it and form the menu you can select Open Developer Tool and in the sub menu you can select the iOS Simulator to open the simulator without opening the Xcode.!enter image description here

An implementation of the fast Fourier transform (FFT) in C#

Math.NET's Iridium library provides a fast, regularly updated collection of math-related functions, including the FFT. It's licensed under the LGPL so you are free to use it in commercial products.

Creating a .p12 file

The openssl documentation says that file supplied as the -in argument must be in PEM format.

Turns out that, contrary to the CA's manual, the certificate returned by the CA which I stored in myCert.cer is not PEM format rather it is PKCS7.

In order to create my .p12, I had to first convert the certificate to PEM:

openssl pkcs7 -in myCert.cer -print_certs -out certs.pem

and then execute

openssl pkcs12 -export -out keyStore.p12 -inkey myKey.pem -in certs.pem

How do you push a tag to a remote repository using Git?

You can push all local tags by simply git push --tags command.

$ git tag                         # see tag lists
$ git push origin <tag-name>      # push a single tag
$ git push --tags                 # push all local tags 

Replace all non Alpha Numeric characters, New Lines, and multiple White Space with one Space

This is an old post of mine, the accepted answers are good for the most part. However i decided to benchmark each solution and another obvious one (just for fun). I wondered if there was a difference between the regex patterns on different browsers with different sized strings.

So basically i used jsPerf on

  • Testing in Chrome 65.0.3325 / Windows 10 0.0.0
  • Testing in Edge 16.16299.0 / Windows 10 0.0.0

The regex patterns i tested were

  • /[\W_]+/g
  • /[^a-z0-9]+/gi
  • /[^a-zA-Z0-9]+/g

I loaded them up with a string length of random characters

  • length 5000
  • length 1000
  • length 200

Example javascript i used var newstr = str.replace(/[\W_]+/g," ");

Each run consisted of 50 or more sample on each regex, and i run them 5 times on each browser.

Lets race our horses!

Results

                                Chrome                  Edge
Chars   Pattern                 Ops/Sec     Deviation   Op/Sec      Deviation
------------------------------------------------------------------------
5,000   /[\W_]+/g                19,977.80  1.09         10,820.40  1.32
5,000   /[^a-z0-9]+/gi           19,901.60  1.49         10,902.00  1.20
5,000   /[^a-zA-Z0-9]+/g         19,559.40  1.96         10,916.80  1.13
------------------------------------------------------------------------
1,000   /[\W_]+/g                96,239.00  1.65         52,358.80  1.41
1,000   /[^a-z0-9]+/gi           97,584.40  1.18         52,105.00  1.60
1,000   /[^a-zA-Z0-9]+/g         96,965.80  1.10         51,864.60  1.76
------------------------------------------------------------------------
  200   /[\W_]+/g               480,318.60  1.70        261,030.40  1.80
  200   /[^a-z0-9]+/gi          476,177.80  2.01        261,751.60  1.96
  200   /[^a-zA-Z0-9]+/g        486,423.00  0.80        258,774.20  2.15

Truth be known, Regex in both browsers (taking into consideration deviation) were nearly indistinguishable, however i think if it run this even more times the results would become a little more clearer (but not by much).

Theoretical scaling for 1 character

                            Chrome                        Edge
Chars   Pattern             Ops/Sec     Scaled            Op/Sec    Scaled
------------------------------------------------------------------------
5,000   /[\W_]+/g            19,977.80  99,889,000       10,820.40  54,102,000
5,000   /[^a-z0-9]+/gi       19,901.60  99,508,000       10,902.00  54,510,000
5,000   /[^a-zA-Z0-9]+/g     19,559.40  97,797,000       10,916.80  54,584,000
------------------------------------------------------------------------

1,000   /[\W_]+/g            96,239.00  96,239,000       52,358.80  52,358,800
1,000   /[^a-z0-9]+/gi       97,584.40  97,584,400       52,105.00  52,105,000
1,000   /[^a-zA-Z0-9]+/g     96,965.80  96,965,800       51,864.60  51,864,600
------------------------------------------------------------------------

  200   /[\W_]+/g           480,318.60  96,063,720      261,030.40  52,206,080
  200   /[^a-z0-9]+/gi      476,177.80  95,235,560      261,751.60  52,350,320
  200   /[^a-zA-Z0-9]+/g    486,423.00  97,284,600      258,774.20  51,754,840

I wouldn't take to much into these results as this is not really a significant differences, all we can really tell is edge is slower :o . Additionally that i was super bored.

Anyway you can run the benchmark for your self.

Jsperf Benchmark here

Can CSS force a line break after each word in an element?

Use

.one-word-per-line {
    word-spacing: <parent-width>; 
}

.your-classname{
    width: min-intrinsic;
    width: -webkit-min-content;
    width: -moz-min-content;
    width: min-content;
    display: table-caption;
    display: -ms-grid;
    -ms-grid-columns: min-content;
}

where <parent-width> is the width of the parent element (or an arbitrary high value that doesn't fit into one line). That way you can be sure that there is even a line-break after a single letter. Works with Chrome/FF/Opera/IE7+ (and probably even IE6 since it's supporting word-spacing as well).

Appending an element to the end of a list in Scala

List(1,2,3) :+ 4

Results in List[Int] = List(1, 2, 3, 4)

Note that this operation has a complexity of O(n). If you need this operation frequently, or for long lists, consider using another data type (e.g. a ListBuffer).

Parse usable Street Address, City, State, Zip from a string

For ruby or rails developers there is a nice gem available called street_address. I have been using this on one of my project and it does the work I need.

The only Issue I had was whenever an address is in this format P. O. Box 1410 Durham, NC 27702 it returned nil and therefore I had to replace "P. O. Box" with '' and after this it were able to parse it.

How do I mock a service that returns promise in AngularJS Jasmine unit test?

using sinon :

const mockAction = sinon.stub(MyService.prototype,'actionBeingCalled')
                     .returns(httpPromise(200));

Known that, httpPromise can be :

const httpPromise = (code) => new Promise((resolve, reject) =>
  (code >= 200 && code <= 299) ? resolve({ code }) : reject({ code, error:true })
);

C++: Where to initialize variables in constructor

There are many other reasons. You should always initialize all member variables in the initialization list if possible.

http://www.parashift.com/c++-faq-lite/ctors.html#faq-10.6

How to SELECT WHERE NOT EXIST using LINQ?

from s in context.shift
where !context.employeeshift.Any(es=>(es.shiftid==s.shiftid)&&(es.empid==57))
select s;

Hope this helps

How to set "style=display:none;" using jQuery's attr method?

Based on the comment we are removing one property from style attribute.

Here this was not affect, but when more property are used within the style it helpful.

$('#msform').css('display', '')

After this we use

$("#msform").show();

Add a new item to recyclerview programmatically?

First add your item to mItems and then use:

mAdapter.notifyItemInserted(mItems.size() - 1);

this method is better than using:

mAdapter.notifyDataSetChanged();

in performance.

Go to first line in a file in vim?

In command mode (press Esc if you are not sure) you can use:

  • gg,
  • :1,
  • 1G,
  • or 1gg.

Activate tabpage of TabControl

There are two properties in a TabControl control that manages which tab page is selected.

SelectedIndex which offer the possibility to select it by index (an integer starting from 0 to the number of tabs you have minus one).

SelectedTab which offer the possibility to selected the tab object itself to select.

Setting either of these property will change the currently displayed tab.

Alternatively you can also use the Select method. It comes in three flavour, one where you pass the index of the tab, another the TabPage object itself and the last one a string representing the tab's name.

How to reset the bootstrap modal when it gets closed and open it fresh again?

Just reset any content manually when modal is hidden:

$(".modal").on("hidden.bs.modal", function(){
    $(".modal-body1").html("");
});

There is more events. More about them here

_x000D_
_x000D_
$(document).ready(function() {_x000D_
  $(".modal").on("hidden.bs.modal", function() {_x000D_
    $(".modal-body1").html("Where did he go?!?!?!");_x000D_
  });_x000D_
});
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" />_x000D_
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>_x000D_
_x000D_
<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">_x000D_
  Launch modal_x000D_
</button>_x000D_
_x000D_
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">_x000D_
  <div class="modal-dialog">_x000D_
    <div class="modal-content">_x000D_
      <div class="modal-header">_x000D_
        <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span>_x000D_
        </button>_x000D_
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>_x000D_
      </div>_x000D_
      <div class="modal-body">_x000D_
        <div class='modal-body1'>_x000D_
          <h3>Close and open, I will be gone!</h3>_x000D_
        </div>_x000D_
      </div>_x000D_
      <div class="modal-footer">_x000D_
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>_x000D_
      </div>_x000D_
    </div>_x000D_
  </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

CSS Layout - Dynamic width DIV

try

<div style="width:100%;">
    <div style="width:50px; float: left;"><img src="myleftimage" /></div>
    <div style="width:50px; float: right;"><img src="myrightimage" /></div>
    <div style="display:block; margin-left:auto; margin-right: auto;">Content Goes Here</div>
</div>

or

<div style="width:100%; border:2px solid #dadada;">
    <div style="width:50px; float: left;"><img src="myleftimage" /></div>
    <div style="width:50px; float: right;"><img src="myrightimage" /></div>
    <div style="display:block; margin-left:auto; margin-right: auto;">Content Goes Here</div>
<div style="clear:both"></div>    
</div>

Spring Rest POST Json RequestBody Content type not supported

I had the same issue when I had two setters one with Enum and one String. I had to use @JsonSetter annotation which tells Jackson what setter method to use during serialization. This solved my issue.

Why does CSV file contain a blank line in between each data line when outputting with Dictwriter in Python

Changing the 'w' (write) in this line:

output = csv.DictWriter(open('file3.csv','w'), delimiter=',', fieldnames=headers)

To 'wb' (write binary) fixed this problem for me:

output = csv.DictWriter(open('file3.csv','wb'), delimiter=',', fieldnames=headers)

Python v2.75: Open()

Credit to @dandrejvv for the solution in the comment on the original post above.

"Could not find Developer Disk Image"

I am facing the same issue on Xcode 7.3 and my device version is iOS 10.

This error is shown when your Xcode is old and the related device you are using is updated to latest version. First of all, install the latest Xcode version.

We can solve this issue by following the below steps:-

  • Open Finder select Applications
  • Right click on Xcode 8, select "Show Package Contents", "Contents", "Developer", "Platforms", "iPhoneOS.Platform", "Device Support"
  • Copy the 10.0 folder (or above for later version).
  • Back in Finder select Applications again
  • Right click on Xcode 7.3, select "Show Package Contents", "Contents", "Developer", "Platforms", "iPhoneOS.Platform", "Device Support"
  • Paste the 10.0 folder

If everything worked properly, your Xcode has a new developer disk image. Close the finder now, and quit your Xcode. Open your Xcode and the error will be gone. Now you can connect your latest device to old Xcode versions.

Thanks

Program to find prime numbers

This solution displays all prime numbers between 0 and 100.

        int counter = 0;
        for (int c = 0; c <= 100; c++)
        {
            counter = 0;
            for (int i = 1; i <= c; i++)
            {
                if (c % i == 0)
                { counter++; }
            }
            if (counter == 2)
            { Console.Write(c + " "); }
        }

The PowerShell -and conditional operator

Try like this:

if($user_sam -ne $NULL -and $user_case -ne $NULL)

Empty variables are $null and then different from "" ([string]::empty).

MySQL INSERT INTO table VALUES.. vs INSERT INTO table SET

I think the extension is intended to allow a similar syntax for inserts and updates. In Oracle, a similar syntactical trick is:

UPDATE table SET (col1, col2) = (SELECT val1, val2 FROM dual)

How to output to the console in C++/Windows

I assume you're using some version of Visual Studio? In windows, std::cout << "something"; should write something to a console window IF your program is setup in the project settings as a console program.

Setting the target version of Java in ant javac

Both source and target should be specified. I recommend providing ant defaults, that way you do not need to specify source/target attribute for every javac task:

<property name="ant.build.javac.source" value="1.5"/>
<property name="ant.build.javac.target" value="1.5"/>

See Java cross-compiling notes for more information.

How to create an executable .exe file from a .m file

Try:

mcc -m yourfile

Also see help mcc

How do I change the default schema in sql developer?

Just right clic on the created connection and select "Schema browser", then use the filter to display the desired one.

Cheers.

Testing whether a value is odd or even

Use modulus:

function isEven(n) {
   return n % 2 == 0;
}

function isOdd(n) {
   return Math.abs(n % 2) == 1;
}

You can check that any value in Javascript can be coerced to a number with:

Number.isFinite(parseFloat(n))

This check should preferably be done outside the isEven and isOdd functions, so you don't have to duplicate error handling in both functions.

FileNotFoundException..Classpath resource not found in spring?

Check the contents of SpringExample/target/classes. Is spring-config.xml there? If not, try manually removing the SpringExample/target/ directory, and force a rebuild with Project=>Clean... in Eclipse.

Reading a UTF8 CSV file with Python

If you want to read a CSV File with encoding utf-8, a minimalistic approach that I recommend you is to use something like this:

with open(file_name, encoding="utf8") as csv_file:

With that statement, you can use later a CSV reader to work with.

socket.shutdown vs socket.close

Explanation of shutdown and close: Graceful shutdown (msdn)

Shutdown (in your case) indicates to the other end of the connection there is no further intention to read from or write to the socket. Then close frees up any memory associated with the socket.

Omitting shutdown may cause the socket to linger in the OSs stack until the connection has been closed gracefully.

IMO the names 'shutdown' and 'close' are misleading, 'close' and 'destroy' would emphasise their differences.

crop text too long inside div

.crop { 
  overflow:hidden; 
  white-space:nowrap; 
  text-overflow:ellipsis; 
  width:100px; 
}?

http://jsfiddle.net/hT3YA/

How to implement the Android ActionBar back button?

AndroidManifest file:

    <activity android:name=".activity.DetailsActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="br.com.halyson.materialdesign.activity.HomeActivity" />
    </activity>

add in DetailsActivity:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);   
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}

it's work :]

Dump all tables in CSV format using 'mysqldump'

mysqldump has options for CSV formatting:

--fields-terminated-by=name
                  Fields in the output file are terminated by the given
--lines-terminated-by=name
                  Lines in the output file are terminated by the given

The name should contain one of the following:

`--fields-terminated-by`

\t or "\""

`--fields-enclosed-by=name`
   Fields in the output file are enclosed by the given

and

--lines-terminated-by

  • \r
  • \n
  • \r\n

Naturally you should mysqldump each table individually.

I suggest you gather all table names in a text file. Then, iterate through all tables running mysqldump. Here is a script that will dump and gzip 10 tables at a time:

MYSQL_USER=root
MYSQL_PASS=rootpassword
MYSQL_CONN="-u${MYSQL_USER} -p${MYSQL_PASS}"
SQLSTMT="SELECT CONCAT(table_schema,'.',table_name)"
SQLSTMT="${SQLSTMT} FROM information_schema.tables WHERE table_schema NOT IN "
SQLSTMT="${SQLSTMT} ('information_schema','performance_schema','mysql')"
mysql ${MYSQL_CONN} -ANe"${SQLSTMT}" > /tmp/DBTB.txt
COMMIT_COUNT=0
COMMIT_LIMIT=10
TARGET_FOLDER=/path/to/csv/files
for DBTB in `cat /tmp/DBTB.txt`
do
    DB=`echo "${DBTB}" | sed 's/\./ /g' | awk '{print $1}'`
    TB=`echo "${DBTB}" | sed 's/\./ /g' | awk '{print $2}'`
    DUMPFILE=${DB}-${TB}.csv.gz
    mysqldump ${MYSQL_CONN} -T ${TARGET_FOLDER} --fields-terminated-by="," --fields-enclosed-by="\"" --lines-terminated-by="\r\n" ${DB} ${TB} | gzip > ${DUMPFILE}
    (( COMMIT_COUNT++ ))
    if [ ${COMMIT_COUNT} -eq ${COMMIT_LIMIT} ]
    then
        COMMIT_COUNT=0
        wait
    fi
done
if [ ${COMMIT_COUNT} -gt 0 ]
then
    wait
fi

How to create a project from existing source in Eclipse and then find it?

This answer is going to be for the question

How to create a new eclipse project and add a folder or a new package into the project, or how to build a new project for existing java files.

  1. Create a new project from the menu File->New-> Java Project
  2. If you are going to add a new pakcage, then create the same package name here by File->New-> Package
  3. Click the name of the package in project navigator, and right click, and import... Import->General->File system (choose your file or package)

this worked for me I hope it helps others. Thank you.

Compare string with all values in list

In Python you may use the in operator. You can do stuff like this:

>>> "c" in "abc"
True

Taking this further, you can check for complex structures, like tuples:

>>> (2, 4, 8) in ((1, 2, 3), (2, 4, 8))
True

a href link for entire div in HTML/CSS

Going off of what Surreal Dreams said, it's probably best to style the anchor tag in my experience, but it really does depend on what you are doing. Here's an example:

Html:

<div class="parent-div">
  <a href="#">Test</a>
  <a href="#">Test</a>
  <a href="#">Test</a>
</div>

Then the CSS:

.parent-div {
  width: 200px;
}
a {
  display:block;
  background-color: #ccc;
  color: #000;
  text-decoration:none;
  padding:10px;
  margin-bottom:1px;
}
a:hover {
  background-color: #ddd;
}

http://jsbin.com/zijijuduqo/1/edit?html,css,output

Creating a Custom Event

Based on @ionden's answer, the call to the delegate could be simplified using null propagation since C# 6.0.

Your code would simply be:

class MyClass {
    public event EventHandler MyEvent;

    public void Method() {
        MyEvent?.Invoke(this, EventArgs.Empty);
    }
}

Use it like this:

MyClass myObject = new MyClass();
myObject.MyEvent += new EventHandler(myObject_MyEvent);
myObject.Method();

Unsigned keyword in C++

From the link above:

Several of these types can be modified using the keywords signed, unsigned, short, and long. When one of these type modifiers is used by itself, a data type of int is assumed

This means that you can assume the author is using ints.

Absolute and Flexbox in React Native

This solution worked for me:

tabBarOptions: {
      showIcon: true,
      showLabel: false,
      style: {
        backgroundColor: '#000',
        borderTopLeftRadius: 40,
        borderTopRightRadius: 40,
        position: 'relative',
        zIndex: 2,
        marginTop: -48
      }
  }

ConnectionTimeout versus SocketTimeout

A connection timeout is the maximum amount of time that the program is willing to wait to setup a connection to another process. You aren't getting or posting any application data at this point, just establishing the connection, itself.

A socket timeout is the timeout when waiting for individual packets. It's a common misconception that a socket timeout is the timeout to receive the full response. So if you have a socket timeout of 1 second, and a response comprised of 3 IP packets, where each response packet takes 0.9 seconds to arrive, for a total response time of 2.7 seconds, then there will be no timeout.

MySQL 'create schema' and 'create database' - Is there any difference

Strictly speaking, the difference between Database and Schema is inexisting in MySql.

However, this is not the case in other database engines such as SQL Server. In SQL server:,

Every table belongs to a grouping of objects in the database called database schema. It's a container or namespace (Querying Microsoft SQL Server 2012)

By default, all the tables in SQL Server belong to a default schema called dbo. When you query a table that hasn't been allocated to any particular schema, you can do something like:

SELECT *
FROM your_table

which is equivalent to:

SELECT *
FROM dbo.your_table

Now, SQL server allows the creation of different schema, which gives you the possibility of grouping tables that share a similar purpose. That helps to organize the database.

For example, you can create an schema called sales, with tables such as invoices, creditorders (and any other related with sales), and another schema called lookup, with tables such as countries, currencies, subscriptiontypes (and any other table used as look up table).

The tables that are allocated to a specific domain are displayed in SQL Server Studio Manager with the schema name prepended to the table name (exactly the same as the tables that belong to the default dbo schema).

There are special schemas in SQL Server. To quote the same book:

There are several built-in database schemas, and they can't be dropped or altered:

1) dbo, the default schema.

2) guest contains objects available to a guest user ("guest user" is a special role in SQL Server lingo, with some default and highly restricted permissions). Rarely used.

3) INFORMATION_SCHEMA, used by the Information Schema Views

4) sys, reserved for SQL Server internal use exclusively

Schemas are not only for grouping. It is actually possible to give different permissions for each schema to different users, as described MSDN.

Doing this way, the schema lookup mentioned above could be made available to any standard user in the database (e.g. SELECT permissions only), whereas a table called supplierbankaccountdetails may be allocated in a different schema called financial, and to give only access to the users in the group accounts (just an example, you get the idea).

Finally, and quoting the same book again:

It isn't the same Database Schema and Table Schema. The former is the namespace of a table, whereas the latter refers to the table definition

Visual studio equivalent of java System.out

In System.Diagnostics,

Debug.Write()
Debug.WriteLine()

etc. will print to the Output window in VS.

Create an Android GPS tracking application

Basically you need following things to make location detector android app

Now if you write each of these module yourself then it needs much time and efforts. So it would be better to use ready resources that are being maintained already.

Using all these resources, you will be able to create an flawless android location detection app.

1. Location Listening

You will first need to listen for current location of user. You can use any of below libraries to quick start.

Google Play Location Samples

This library provide last known location, location updates

Location Manager

With this library you just need to provide a Configuration object with your requirements, and you will receive a location or a fail reason with all the stuff are described above handled.

Live Location Sharing

Use this open source repo of the Hypertrack Live app to build live location sharing experience within your app within a few hours. HyperTrack Live app helps you share your Live Location with friends and family through your favorite messaging app when you are on the way to meet up. HyperTrack Live uses HyperTrack APIs and SDKs.

2. Markers Library

Google Maps Android API utility library

  • Marker clustering — handles the display of a large number of points
  • Heat maps — display a large number of points as a heat map
  • IconGenerator — display text on your Markers
  • Poly decoding and encoding — compact encoding for paths, interoperability with Maps API web services
  • Spherical geometry — for example: computeDistance, computeHeading, computeArea
  • KML — displays KML data
  • GeoJSON — displays and styles GeoJSON data

3. Polyline Libraries

DrawRouteMaps

If you want to add route maps feature in your apps you can use DrawRouteMaps to make you work more easier. This is lib will help you to draw route maps between two point LatLng.

trail-android

Simple, smooth animation for route / polylines on google maps using projections. (WIP)

Google-Directions-Android

This project allows you to calculate the direction between two locations and display the route on a Google Map using the Google Directions API.

A map demo app for quick start with maps

How can I mimic the bottom sheet from the Maps app?

I recently created a component called SwipeableView as subclass of UIView, written in Swift 5.1 . It support all 4 direction, has several customisation options and can animate and interpolate different attributes and items ( such as layout constraints, background/tint color, affine transform, alpha channel and view center, all of them demoed with the respective show case ). It also supports the swiping coordination with the inner scroll view if set or auto detected. Should be pretty easy and straightforward to be used ( I hope )

Link at https://github.com/LucaIaco/SwipeableView

proof of concept:

enter image description here

Hope it helps

Installation error: INSTALL_FAILED_OLDER_SDK

Fix for new Android 6.0 Marshmallow Fixed my issue when I updated to API 23 (Android 6.0 Marshmallow) by updating the build tools version to 23.0.0 as follows:

android {
    buildToolsVersion '23.0.0'
...

And went to File > Project Structure , chose Properties tab then updated the Compile Sdk version to "API 23: Android 5.X (MNC)" and the Build tools version to "23.0.0"

Set custom HTML5 required field validation message

You can simply achieve this using oninvalid attribute, checkout this demo code

<form>
<input type="email" pattern="[^@]*@[^@]" required oninvalid="this.setCustomValidity('Put  here custom message')"/>
<input type="submit"/>
</form>

enter image description here

Codepen Demo: https://codepen.io/akshaykhale1992/pen/yLNvOqP

Oracle Add 1 hour in SQL

select sysdate + 1/24 from dual;

sysdate is a function without arguments which returns DATE type
+ 1/24 adds 1 hour to a date

select to_char(to_date('2014-10-15 03:30:00 pm', 'YYYY-MM-DD HH:MI:SS pm') + 1/24, 'YYYY-MM-DD HH:MI:SS pm') from dual;

How to print color in console using System.out.println?

The best way to color console text is to use ANSI escape codes. In addition of text color, ANSI escape codes allows background color, decorations and more.

Unix

If you use springboot, there is a specific enum for text coloring: org.springframework.boot.ansi.AnsiColor

Jansi library is a bit more advanced (can use all the ANSI escape codes fonctions), provides an API and has a support for Windows using JNA.

Otherwise, you can manually define your own color, as shown is other responses.

Windows 10

Windows 10 (since build 10.0.10586 - nov. 2015) supports ANSI escape codes (MSDN documentation) but it's not enabled by default. To enable it:

  • With SetConsoleMode API, use ENABLE_VIRTUAL_TERMINAL_PROCESSING (0x0400) flag. Jansi uses this option.
  • If SetConsoleMode API is not used, it is possible to change the global registry key HKEY_CURRENT_USER\Console\VirtualTerminalLevel by creating a dword and set it to 0 or 1 for ANSI processing: "VirtualTerminalLevel"=dword:00000001

Before Windows 10

Windows console does not support ANSI colors. But it's possible to use console which does.

How to check if div element is empty

You can use .is().

if( $('#leftmenu').is(':empty') ) {

Or you could just test the length property to see if one was found:

if( $('#leftmenu:empty').length ) {

You can use $.trim() to remove whitespace (if that's what you want) and check for the length of the content.

if( !$.trim( $('#leftmenu').html() ).length ) {

Get content of a cell given the row and column numbers

Try =index(ARRAY, ROW, COLUMN)

where: Array: select the whole sheet Row, Column: Your row and column references

That should be easier to understand to those looking at the formula.

rails bundle clean

If you are using Bundler 1.1 or later you can use bundle clean, just as you imagined you could. This is redundant if you're using bundle install --path (Bundler manages the location you specified with --path, so takes responsibility for removing outdated gems), but if you've used Bundler to install the gems as system gems then bundle clean --force will delete any system gems not required by your Gemfile. Blindingly obvious caveat: don't do this if you have other apps that rely on system gems that aren't in your Gemfile!

Pat Shaughnessy has a good description of bundle clean and other new additions in bundler 1.1.

convert datetime to date format dd/mm/yyyy

string currentdatetime = DateTime.Now.ToString("dd'/'MM'/'yyyy");

How to add to an existing hash in Ruby

my_hash = {:a => 5}
my_hash[:key] = "value"

byte array to pdf

Usually this happens if something is wrong with the byte array.

File.WriteAllBytes("filename.PDF", Byte[]);

This creates a new file, writes the specified byte array to the file, and then closes the file. If the target file already exists, it is overwritten.

Asynchronous implementation of this is also available.

public static System.Threading.Tasks.Task WriteAllBytesAsync 
(string path, byte[] bytes, System.Threading.CancellationToken cancellationToken = null);

How to delete row based on cell value

The screenshot was very helpful - the following code will do the job (assuming data is located in column A starting A1):

Sub RemoveRows()

Dim i As Long

i = 1

Do While i <= ThisWorkbook.ActiveSheet.Range("A1").CurrentRegion.Rows.Count

    If InStr(1, ThisWorkbook.ActiveSheet.Cells(i, 1).Text, "-", vbTextCompare) > 0 Then
        ThisWorkbook.ActiveSheet.Cells(i, 1).EntireRow.Delete
    Else
        i = i + 1
    End If

Loop

End Sub

Sample file is shared: https://www.dropbox.com/s/2vhq6vw7ov7ssya/RemoweDashRows.xlsm

@Transactional(propagation=Propagation.REQUIRED)

To understand the various transactional settings and behaviours adopted for Transaction management, such as REQUIRED, ISOLATION etc. you'll have to understand the basics of transaction management itself.

Read Trasaction management for more on explanation.

What is String pool in Java?

When the JVM loads classes, or otherwise sees a literal string, or some code interns a string, it adds the string to a mostly-hidden lookup table that has one copy of each such string. If another copy is added, the runtime arranges it so that all the literals refer to the same string object. This is called "interning". If you say something like

String s = "test";
return (s == "test");

it'll return true, because the first and second "test" are actually the same object. Comparing interned strings this way can be much, much faster than String.equals, as there's a single reference comparison rather than a bunch of char comparisons.

You can add a string to the pool by calling String.intern(), which will give you back the pooled version of the string (which could be the same string you're interning, but you'd be crazy to rely on that -- you often can't be sure exactly what code has been loaded and run up til now and interned the same string). The pooled version (the string returned from intern) will be equal to any identical literal. For example:

String s1 = "test";
String s2 = new String("test");  // "new String" guarantees a different object

System.out.println(s1 == s2);  // should print "false"

s2 = s2.intern();
System.out.println(s1 == s2);  // should print "true"

Breaking out of a for loop in Java

You can use:

for (int x = 0; x < 10; x++) {
  if (x == 5) { // If x is 5, then break it.
    break;
  }
}

Can't open config file: /usr/local/ssl/openssl.cnf on Windows

Simply install Win64 OpenSSL v1.0.2a or Win32 OpenSSL v1.0.2a, you can download these from http://slproweb.com/products/Win32OpenSSL.html. Works out of the box, no configuration needed.

How to implement private method in ES6 class with Traceur

As alexpods says, there is no dedicated way to do this in ES6. However, for those interested, there is also a proposal for the bind operator which enables this sort of syntax:

function privateMethod() {
  return `Hello ${this.name}`;
}

export class Animal {
  constructor(name) {
    this.name = name;
  }
  publicMethod() {
    this::privateMethod();
  }
}

Once again, this is just a proposal. Your mileage may vary.

JQuery add class to parent element

Specify the optional selector to target what you want:

jQuery(this).parent('li').addClass('yourClass');

Or:

jQuery(this).parents('li').addClass('yourClass');

How to set 00:00:00 using moment.js

var time = moment().toDate();  // This will return a copy of the Date that the moment uses

time.setHours(0);
time.setMinutes(0);
time.setSeconds(0);
time.setMilliseconds(0);

How to iterate over the keys and values with ng-repeat in AngularJS?

    Use below code it is working to display your key and value here is key start with 1:
         <tr ng-repeat="(key,value) in alert_list" >
                   <td>{{key +1}}</td>
                   <td>{{value.title}}</td>
                 </tr>
Below is document link for it. 

https://docs.angularjs.org/api/ng/directive/ngRepeat

Jenkins Pipeline Wipe Out Workspace

Cleaning up : Since the post section of a Pipeline is guaranteed to run at the end of a Pipeline’s execution, we can add some notification or other steps to perform finalization, notification, or other end-of-Pipeline tasks.

pipeline {
    agent any
    stages {
        stage('No-op') {
            steps {
                sh 'ls'
            }
        }
    }
    post {
        cleanup {
            echo 'One way or another, I have finished'
            deleteDir() /* clean up our workspace */
        }
    }
}

How can I switch language in google play?

Answer below the dotted line below is the original that's now outdated.

Here is the latest information ( Thank you @deadfish ):

add &hl=<language> like &hl=pl or &hl=en

example: https://play.google.com/store/apps/details?id=com.example.xxx&hl=en or https://play.google.com/store/apps/details?id=com.example.xxx&hl=pl

All available languages and abbreviations can be looked up here: https://support.google.com/googleplay/android-developer/table/4419860?hl=en

......................................................................

To change the actual local market:

Basically the market is determined automatically based on your IP. You can change some local country settings from your Gmail account settings but still IP of the country you're browsing from is more important. To go around it you'd have to Proxy-cheat. Check out some ways/sites: http://www.affilorama.com/forum/market-research/how-to-change-country-search-settings-in-google-t4160.html

To do it from an Android phone you'd need to find an app. I don't have my Droid anymore but give this a try: http://forum.xda-developers.com/showthread.php?t=694720

How to create an Oracle sequence starting with max value from a table?

If you can use PL/SQL, try (EDIT: Incorporates Neil's xlnt suggestion to start at next higher value):

SELECT 'CREATE SEQUENCE transaction_sequence MINVALUE 0 START WITH '||MAX(trans_seq_no)+1||' INCREMENT BY 1 CACHE 20'
  INTO v_sql
  FROM transaction_log;

EXECUTE IMMEDIATE v_sql;

Another point to consider: By setting the CACHE parameter to 20, you run the risk of losing up to 19 values in your sequence if the database goes down. CACHEd values are lost on database restarts. Unless you're hitting the sequence very often, or, you don't care that much about gaps, I'd set it to 1.

One final nit: the values you specified for CACHE and INCREMENT BY are the defaults. You can leave them off and get the same result.

Hide Spinner in Input Number - Firefox 29

This worked for me:

    input[type='number'] {
    appearance: none;
}

Solved in Firefox, Safari, Chrome. Also, -moz-appearance: textfield; is not supported anymore (https://developer.mozilla.org/en-US/docs/Web/CSS/appearance)

How do I jump to a closing bracket in Visual Studio Code?

You can learn commands from the command palette Ctrl/Cmd + Shift + P). Look for "Go to Bracket". The keybinding is also shown there.

Does the Java &= operator apply & or &&?

Here's a simple way to test it:

public class OperatorTest {     
    public static void main(String[] args) {
        boolean a = false;
        a &= b();
    }

    private static boolean b() {
        System.out.println("b() was called");
        return true;
    }
}

The output is b() was called, therefore the right-hand operand is evaluated.

So, as already mentioned by others, a &= b is the same as a = a & b.

How to convert a Title to a URL slug in jQuery?

function slugify(content) {
   return content.toLowerCase().replace(/ /g,'-').replace(/[^\w-]+/g,'');
}
// slugify('Hello World');
// this will return 'hello-world';

this works for me fine.

Found it on CodeSnipper

VBA copy rows that meet criteria to another sheet

After formatting the previous answer to my own code, I have found an efficient way to copy all necessary data if you are attempting to paste the values returned via AutoFilter to a separate sheet.

With .Range("A1:A" & LastRow)
    .Autofilter Field:=1, Criteria1:="=*" & strSearch & "*"
    .Offset(1,0).SpecialCells(xlCellTypeVisible).Cells.Copy
    Sheets("Sheet2").activate
    DestinationRange.PasteSpecial
End With

In this block, the AutoFilter finds all of the rows that contain the value of strSearch and filters out all of the other values. It then copies the cells (using offset in case there is a header), opens the destination sheet and pastes the values to the specified range on the destination sheet.

TLS 1.2 in .NET Framework 4.0

There are two possible scenarios,

  1. If your application runs on .net framework 4.5 or less, and you can easily deploy new code to the production then you can use of below solution.

    You can add the below line of code before making the API call,

    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; // .NET 4.5
    ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072; // .NET 4.0
    
  2. If you cannot deploy new code and you want to resolve the issue with the same code which is present in the production, then you have two options.

Option 1 :

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001


then create a file with extension .reg and install.

Note : This setting will apply at registry level and is applicable to all application present on that machine and if you want to restrict to only single application then you can use Option 2

Option 2 : This can be done by changing some configuration setting in config file. You can add either in your config file.

<runtime>
    <AppContextSwitchOverrides value="Switch.System.Net.DontEnableSchUseStrongCrypto=false"/>
</runtime>

or

<runtime>
  <AppContextSwitchOverrides value="Switch.System.Net.DontEnableSystemDefaultTlsVersions=false"
</runtime>

openpyxl - adjust column width size

A slight improvement of the above accepted answer, that I think is more pythonic (asking for forgiveness is better than asking for permission)

column_widths = []
for row in workSheet.iter_rows():
    for i, cell in enumerate(row):
        try:
            column_widths[i] = max(column_widths[i], len(str(cell.value)))
        except IndexError:
            column_widths.append(len(str(cell.value)))

for i, column_width in enumerate(column_widths):
    workSheet.column_dimensions[get_column_letter(i + 1)].width = column_width

Correct way to delete cookies server-side

Setting "expires" to a past date is the standard way to delete a cookie.

Your problem is probably because the date format is not conventional. IE probably expects GMT only.

Javascript "Not a Constructor" Exception while creating objects

To add to @wprl's answer, the ES6 object method shorthand, like the arrow functions, cannot be used as a constructor either.

const o = {
  a: () => {},
  b() {},
  c: function () {}
};

const { a, b, c } = o;

new a(); // throws "a is not a constructor"
new b(); // throws "b is not a constructor"
new c(); // works