How to test an Oracle Stored Procedure with RefCursor return type?
In Toad 10.1.1.8 I use:
variable salida refcursor
exec MY_PKG.MY_PRC(1, 2, 3, :salida) -- 1, 2, 3 are params
print salida
Then, Execute as Script.
Relay access denied on sending mail, Other domain outside of network
Set your SMTP auth to true if using the PHPmailer class:
$mail->SMTPAuth = true;
multiprocessing.Pool: When to use apply, apply_async or map?
Regarding apply vs map:
pool.apply(f, args): f is only executed in ONE of the workers of the pool. So ONE of the processes in the pool will run f(args).
pool.map(f, iterable): This method chops the iterable into a number of chunks which it submits to the process pool as separate tasks. So you take advantage of all the processes in the pool.
How to add a line to a multiline TextBox?
@Casperah pointed out that i'm thinking about it wrong:
- A
TextBoxdoesn't have lines - it has text
- that text can be split on the CRLF into lines, if requested
- but there is no notion of lines
The question then is how to accomplish what i want, rather than what WinForms lets me.
There are subtle bugs in the other given variants:
textBox1.AppendText("Hello" + Environment.NewLine);textBox1.AppendText("Hello" + "\r\n");textBox1.Text += "Hello\r\n"textbox1.Text += System.Environment.NewLine + "brown";
They either append or prepend a newline when one (might) not be required.
So, extension helper:
public static class WinFormsExtensions
{
public static void AppendLine(this TextBox source, string value)
{
if (source.Text.Length==0)
source.Text = value;
else
source.AppendText("\r\n"+value);
}
}
So now:
textBox1.Clear();
textBox1.AppendLine("red");
textBox1.AppendLine("green");
textBox1.AppendLine("blue");
and
textBox1.AppendLine(String.Format("Processing file {0}", filename));
Note: Any code is released into the public domain. No attribution required.
Formatting a float to 2 decimal places
This is for cases that you want to use interpolated strings. I'm actually posting this because I'm tired of trial and error and eventually scrolling through tons of docs every time I need to format some scalar.
$"{1234.5678:0.00}" "1234.57" 2 decimal places, notice that value is rounded
$"{1234.5678,10:0.00}" " 1234.57" right-aligned
$"{1234.5678,-10:0.00}" "1234.57 " left-aligned
$"{1234.5678:0.#####}" "1234.5678" 5 optional digits after the decimal point
$"{1234.5678:0.00000}" "1234.56780" 5 forced digits AFTER the decimal point, notice the trailing zero
$"{1234.5678:00000.00}" "01234.57" 5 forced digits BEFORE the decimal point, notice the leading zero
$"{1234.5612:0}" "1235" as integer, notice that value is rounded
$"{1234.5678:F2}" "1234.57" standard fixed-point
$"{1234.5678:F5}" "1234.56780" 5 digits after the decimal point, notice the trailing zero
$"{1234.5678:g2}" "1.2e+03" standard general with 2 meaningful digits, notice "e"
$"{1234.5678:G2}" "1.2E+03" standard general with 2 meaningful digits, notice "E"
$"{1234.5678:G3}" "1.23E+03" standard general with 3 meaningful digits
$"{1234.5678:G5}" "1234.6" standard general with 5 meaningful digits
$"{1234.5678:e2}" "1.23e+003" standard exponential with 2 digits after the decimal point, notice "e"
$"{1234.5678:E3}" "1.235E+003" standard exponential with 3 digits after the decimal point, notice "E"
$"{1234.5678:N2}" "1,234.57" standard numeric, notice the comma
$"{1234.5678:C2}" "$1,234.57" standard currency, notice the dollar sign
$"{1234.5678:P2}" "123,456.78 %" standard percent, notice that value is multiplied by 100
$"{1234.5678:2}" "2" :)
Performance Warning
Interpolated strings are slow. In my experience this is the order (fast to slow):
value.ToString(format)+" blah blah"string.Format("{0:format} blah blah", value)$"{value:format} blah blah"
How to center a component in Material-UI and make it responsive?
Another option is:
<Grid container justify = "center">
<Your centered component/>
</Grid>
Twitter Bootstrap vs jQuery UI?
I have on several projects.
The biggest difference in my opinion
jQuery UI is fallback safe, it works correctly and looks good in old browsers, where Bootstrap is based on CSS3 which basically means GREAT in new browsers, not so great in old
Update frequency: Bootstrap is getting some great big updates with awesome new features, but sadly they might break previous code, so you can't just install bootstrap and update when there is a new major release, it basically requires a lot of new coding
jQuery UI is based on good html structure with transformations from JavaScript, while Bootstrap is based on visually and customizable inline structure. (calling a widget in JQUERY UI, defining it in Bootstrap)
So what to choose?
That always depends on the type of project you are working on. Is cool and fast looking widgets better, or are your users often using old browsers?
I always end up using both, so I can use the best of both worlds.
Here are the links to both frameworks, if you decide to use them.
HTML <select> selected option background-color CSS style
This syntax will work in XHTML and does not work in IE6, but this is a non-javascript way:
option[selected] { background: #f00; }
If you want to do this on-the-fly, then you would have to go with javascript, the way others have suggested....
Make column fixed position in bootstrap
With bootstrap 4 just use col-auto
<div class="container-fluid">
<div class="row">
<div class="col-sm-auto">
Fixed content
</div>
<div class="col-sm">
Normal scrollable content
</div>
</div>
</div>
Dynamic SQL results into temp table in SQL Stored procedure
DECLARE @EmpGroup INT =3 ,
@IsActive BIT=1
DECLARE @tblEmpMaster AS TABLE
(EmpCode VARCHAR(20),EmpName VARCHAR(50),EmpAddress VARCHAR(500))
INSERT INTO @tblEmpMaster EXECUTE SPGetEmpList @EmpGroup,@IsActive
SELECT * FROM @tblEmpMaster
How to import a bak file into SQL Server Express
To do this via TSQL (ssms query window or sqlcmd.exe) just run:
RESTORE DATABASE MyDatabase FROM DISK='c:\backups\MyDataBase1.bak'
To do it via GUI - open SSMS, right click on Databases and follow the steps below
Enable 'xp_cmdshell' SQL Server
Right click server -->Facets-->Surface Area Configuration -->XPCmshellEnbled -->true
How can I make a jQuery UI 'draggable()' div draggable for touchscreen?
This project should be helpful - maps touch events to click events in a way that allows jQuery UI to work on iPad and iPhone without any changes. Just add the JS to any existing project.
error: No resource identifier found for attribute 'adSize' in package 'com.google.example' main.xml
Replace
xmlns:android="http://schemas.android.com/apk/res/android"
with
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
then Rebuild Project
Count the number of times a string appears within a string
do this , please note that you will have to define the regex for 'test'!!!
string s = "7,true,NA,false:67,false,NA,false:5,false,NA,false:5,false,NA,false";
string[] parts = (new Regex("")).Split(s);
//just do a count on parts
Delete duplicate records from a SQL table without a primary key
If you don't want to create a new primary key you can use the TOP command in SQL Server:
declare @ID int
while EXISTS(select count(*) from Employee group by EmpId having count(*)> 1)
begin
select top 1 @ID = EmpId
from Employee
group by EmpId
having count(*) > 1
DELETE TOP(1) FROM Employee WHERE EmpId = @ID
end
Saving image to file
You can save image , save the file in your current directory application and move the file to any directory .
Bitmap btm = new Bitmap(image.width,image.height);
Image img = btm;
img.Save(@"img_" + x + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
FileInfo img__ = new FileInfo(@"img_" + x + ".jpg");
img__.MoveTo("myVideo\\img_" + x + ".jpg");
Gson - convert from Json to a typed ArrayList<T>
You may use TypeToken to load the json string into a custom object.
logs = gson.fromJson(br, new TypeToken<List<JsonLog>>(){}.getType());
Documentation:
Represents a generic type T.
Java doesn't yet provide a way to represent generic types, so this class does. Forces clients to create a subclass of this class which enables retrieval the type information even at runtime.
For example, to create a type literal for
List<String>, you can create an empty anonymous inner class:
TypeToken<List<String>> list = new TypeToken<List<String>>() {};This syntax cannot be used to create type literals that have wildcard parameters, such as
Class<?>orList<? extends CharSequence>.
Kotlin:
If you need to do it in Kotlin you can do it like this:
val myType = object : TypeToken<List<JsonLong>>() {}.type
val logs = gson.fromJson<List<JsonLong>>(br, myType)
Or you can see this answer for various alternatives.
How to make unicode string with python3
In a Python 2 program that I used for many years there was this line:
ocd[i].namn=unicode(a[:b], 'utf-8')
This did not work in Python 3.
However, the program turned out to work with:
ocd[i].namn=a[:b]
I don't remember why I put unicode there in the first place, but I think it was because the name can contains Swedish letters åäöÅÄÖ. But even they work without "unicode".
Run ScrollTop with offset of element by ID
No magic involved, just subtract from the offset top of the element
$('html, body').animate({scrollTop: $('#contact').offset().top -100 }, 'slow');
Importing two classes with same name. How to handle?
If you really want or need to use the same class name from two different packages, you have two options:
1-pick one to use in the import and use the other's fully qualified class name:
import my.own.Date;
class Test{
public static void main(String[] args){
// I want to choose my.own.Date here. How?
//Answer:
Date ownDate = new Date();
// I want to choose util.Date here. How ?
//Answer:
java.util.Date utilDate = new java.util.Date();
}
}
2-always use the fully qualified class name:
//no Date import
class Test{
public static void main(String[] args){
// I want to choose my.own.Date here. How?
//Answer:
my.own.Date ownDate = new my.own.Date();
// I want to choose util.Date here. How ?
//Answer:
java.util.Date utilDate = new java.util.Date();
}
}
jquery .live('click') vs .click()
From what I understand the key difference is that live() keeps an eye open for new DOM elements that match the selector you are working on, whereas click() (or bind('click')) attach the event hook and are finished.
Given that alot of your code is loaded asynchronously, using live() will make your life alot easier. If you don't know exactly the code you are loading but you do know what kind of elements you will be listening to, then using this function makes perfect sense.
In terms of performance gains, one alternative to using live() would be to implement an AJAX callback function to re-bind the event hooks.
var ajaxCallback = function(){
$('*').unbind('click');
$('.something').bind('click', someFunction);
$('.somethingElse').bind('click', someOtherFunction);
}
You will need to keep proper track of your event hooks and make sure this function is rebinding the proper events.
p.s. Ajax methods .get(), .post(), .load() and .ajax() all let you specify a callback function.
exclude @Component from @ComponentScan
The configuration seem alright, except that you should use excludeFilters instead of excludes:
@Configuration @EnableSpringConfigured
@ComponentScan(basePackages = {"com.example"}, excludeFilters={
@ComponentScan.Filter(type=FilterType.ASSIGNABLE_TYPE, value=Foo.class)})
public class MySpringConfiguration {}
How to set null value to int in c#?
int does not allow null, use-
int? value = 0
or use
Nullable<int> value
How to emit an event from parent to child?
Use the @Input() decorator in your child component to allow the parent to bind to this input.
In the child component you declare it as is :
@Input() myInputName: myType
To bind a property from parent to a child you must add in you template the binding brackets and the name of your input between them.
Example :
<my-child-component [myChildInputName]="myParentVar"></my-child-component>
But beware, objects are passed as a reference, so if the object is updated in the child the parent's var will be too updated. This might lead to some unwanted behaviour sometime. With primary types the value is copied.
To go further read this :
Docs : https://angular.io/docs/ts/latest/cookbook/component-communication.html
How can I make SMTP authenticated in C#
using System.Net;
using System.Net.Mail;
using(SmtpClient smtpClient = new SmtpClient())
{
var basicCredential = new NetworkCredential("username", "password");
using(MailMessage message = new MailMessage())
{
MailAddress fromAddress = new MailAddress("[email protected]");
smtpClient.Host = "mail.mydomain.com";
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = basicCredential;
message.From = fromAddress;
message.Subject = "your subject";
// Set IsBodyHtml to true means you can send HTML email.
message.IsBodyHtml = true;
message.Body = "<h1>your message body</h1>";
message.To.Add("[email protected]");
try
{
smtpClient.Send(message);
}
catch(Exception ex)
{
//Error, could not send the message
Response.Write(ex.Message);
}
}
}
You may use the above code.
The service cannot be started, either because it is disabled or because it has no enabled devices associated with it
Oddly enough, the issue for me was I was trying to open 2012 SQL Server Integration Services on SSMS 2008 R2. When I opened the same in SSMS 2012, it connected right away.
Create a simple Login page using eclipse and mysql
You Can simply Use One Jsp Page To accomplish the task.
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="java.sql.*"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%
String username=request.getParameter("user_name");
String password=request.getParameter("password");
String role=request.getParameter("role");
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/t_fleet","root","root");
Statement st=con.createStatement();
String query="select * from tbl_login where user_name='"+username+"' and password='"+password+"' and role='"+role+"'";
ResultSet rs=st.executeQuery(query);
while(rs.next())
{
session.setAttribute( "user_name",rs.getString(2));
session.setMaxInactiveInterval(3000);
response.sendRedirect("homepage.jsp");
}
%>
<%}
catch(Exception e)
{
out.println(e);
}
%>
</body>
I have use username, password and role to get into the system. One more thing to implement is you can do page permission checking through jsp and javascript function.
Exit from app when click button in android phonegap?
if(navigator.app){
navigator.app.exitApp();
}else if(navigator.device){
navigator.device.exitApp();
}
Error on renaming database in SQL Server 2008 R2
Another way to close all connections:
Administrative Tools > View Local Services
Stop/Start the "SQL Server (MSSQLSERVER)" service
How can I store JavaScript variable output into a PHP variable?
You can solve this problem by using AJAX. You don't need to load JQuery for AJAX but it has a better error and success handling than native JS.
I would do it like so:
1) add an click eventlistener to all my anchors on the page. 2) on click, you can setup an ajax-request to your php, in the POST-DATA you set the anchor id or the text-value 3) the php gets the value and you can setup a request to your database. Then you return the value which you need and echo it to the ajax-request. 4) your success function of the ajax-request is doing some stuff
For more information about ajax-requests look back here:
-> Ajax-Request NATIVE https://blog.garstasio.com/you-dont-need-jquery/ajax/
A simple JQuery examle:
$("button").click(function(){
$.ajax({url: "demo_test.txt", success: function(result){
$("#div1").html(result);
}});
});
Simple excel find and replace for formulas
You can also click on the Formulas tab in Excel and select Show Formulas, then use the regular "Find" and "Replace" function. This should not affect the rest of your formula.
What's the difference between a temp table and table variable in SQL Server?
Consider also that you can often replace both with derived tables which may be faster as well. As with all performance tuning, though, only actual tests against your actual data can tell you the best approach for your particular query.
Locking a file in Python
Locking a file is usually a platform-specific operation, so you may need to allow for the possibility of running on different operating systems. For example:
import os
def my_lock(f):
if os.name == "posix":
# Unix or OS X specific locking here
elif os.name == "nt":
# Windows specific locking here
else:
print "Unknown operating system, lock unavailable"
Create directory if it does not exist
The following code snippet helps you to create a complete path.
Function GenerateFolder($path) {
$global:foldPath = $null
foreach($foldername in $path.split("\")) {
$global:foldPath += ($foldername+"\")
if (!(Test-Path $global:foldPath)){
New-Item -ItemType Directory -Path $global:foldPath
# Write-Host "$global:foldPath Folder Created Successfully"
}
}
}
The above function split the path you passed to the function and will check each folder whether it exists or not. If it does not exist it will create the respective folder until the target/final folder created.
To call the function, use below statement:
GenerateFolder "H:\Desktop\Nithesh\SrcFolder"
refresh leaflet map: map container is already initialized
When you just remove a map, it destroys the div id reference, so, after remove() you need to build again the div where the map will be displayed, in order to avoid the "Uncaught Error: Map container not found".
if(map != undefined || map != null){
map.remove();
$("#map").html("");
$("#preMap").empty();
$( "<div id=\"map\" style=\"height: 500px;\"></div>" ).appendTo("#preMap");
}
How do you disable the unused variable warnings coming out of gcc in 3rd party code I do not wish to edit?
The compiler is already telling you, it's not value but variable. You are looking for -Wno-unused-variable. Also, try g++ --help=warnings to see a list of available options.
Bind TextBox on Enter-key press
You could easily create your own control inheriting from TextBox and reuse it throughout your project.
Something similar to this should work:
public class SubmitTextBox : TextBox
{
public SubmitTextBox()
: base()
{
PreviewKeyDown += new KeyEventHandler(SubmitTextBox_PreviewKeyDown);
}
void SubmitTextBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
BindingExpression be = GetBindingExpression(TextBox.TextProperty);
if (be != null)
{
be.UpdateSource();
}
}
}
}
There may be a way to get around this step, but otherwise you should bind like this (using Explicit):
<custom:SubmitTextBox
Text="{Binding Path=BoundProperty, UpdateSourceTrigger=Explicit}" />
Trying to handle "back" navigation button action in iOS
Perhaps this answers doesn't fit your explanation but question title. It's useful when you are trying to know when you tapped the back button on an UINavigationBar.
In this case you can use UINavigationBarDelegate protocol and implement one of this methods:
- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item;
- (void)navigationBar:(UINavigationBar *)navigationBar didPopItem:(UINavigationItem *)item;
When didPopItem method is called, it's because you either tapped the back button or you used [UINavigationBar popNavigationItemAnimated:] method and the navigation bar did pop the item.
Now, if you want to know what action triggered the didPopItem method you can use a flag.
With this approach I don't need to manually add a left bar button item with an arrow image in order to make it similar to iOS back button, and be able to set my custom target/action.
Let's see an example:
I have a view controller that has a page view controller, and a custom page indicator view. I'm also using a custom UINavigationBar to display a title to know on what page am I and the back button to go back to the previous page. And I also can swipe to previous/next page on page controller.
#pragma mark - UIPageViewController Delegate Methods
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed {
if( completed ) {
//...
if( currentIndex > lastIndex ) {
UINavigationItem *navigationItem = [[UINavigationItem alloc] initWithTitle:@"Some page title"];
[[_someViewController navigationBar] pushNavigationItem:navigationItem animated:YES];
[[_someViewController pageControl] setCurrentPage:currentIndex];
} else {
_autoPop = YES; //We pop the item automatically from code.
[[_someViewController navigationBar] popNavigationItemAnimated:YES];
[[_someViewController pageControl] setCurrentPage:currentIndex];
}
}
}
So then I implement UINavigationBar delegate methods:
#pragma mark - UINavigationBar Delegate Methods
- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item {
if( !_autoPop ) {
//Pop by back button tap
} else {
//Pop from code
}
_autoPop = NO;
return YES;
}
In this case I used shouldPopItem because the pop is animated and I wanted to handle the back button immediately and not to wait until transition is finished.
c#: getter/setter
Those are Auto-Implemented Properties (Auto Properties for short).
The compiler will auto-generate the equivalent of the following simple implementation:
private string _type;
public string Type
{
get { return _type; }
set { _type = value; }
}
Git - push current branch shortcut
For what it's worth, the ultimate shortcut:
In my .bash_profile I have alias push="git push origin HEAD", so whenever i type push I know I'm pushing to the current branch I'm on.
Implement a loading indicator for a jQuery AJAX call
I'm guessing you're using jQuery.get or some other jQuery ajax function to load the modal. You can show the indicator before the ajax call, and hide it when the ajax completes. Something like
$('#indicator').show();
$('#someModal').get(anUrl, someData, function() { $('#indicator').hide(); });
C# Select elements in list as List of string
List<string> empnames = emplist.Select(e => e.Ename).ToList();
This is an example of Projection in Linq. Followed by a ToList to resolve the IEnumerable<string> into a List<string>.
Alternatively in Linq syntax (head compiled):
var empnamesEnum = from emp in emplist
select emp.Ename;
List<string> empnames = empnamesEnum.ToList();
Projection is basically representing the current type of the enumerable as a new type. You can project to anonymous types, another known type by calling constructors etc, or an enumerable of one of the properties (as in your case).
For example, you can project an enumerable of Employee to an enumerable of Tuple<int, string> like so:
var tuples = emplist.Select(e => new Tuple<int, string>(e.EID, e.Ename));
Cannot find firefox binary in PATH. Make sure firefox is installed. OS appears to be: VISTA
For some reason, adding the environment variable didn't work for me.
I was able to specify a path to Firefox in the command line node configuration, as described on this page (grid2).
-browser “browserName=firefox,version=3.6,firefox_binary=c:\Program Files\Mozilla Firefox\firefox.exe ,maxInstances=3, platform=WINDOWS”
How to choose an AWS profile when using boto3 to connect to CloudFront
Just add profile to session configuration before client call.
boto3.session.Session(profile_name='YOUR_PROFILE_NAME').client('cloudwatch')
Removing spaces from a variable input using PowerShell 4.0
If the string is
$STR = 'HELLO WORLD'
and you want to remove the empty space between 'HELLO' and 'WORLD'
$STR.replace(' ','')
replace takes the string and replaces white space with empty string (of length 0), in other words the white space is just deleted.
'module' has no attribute 'urlencode'
You use the Python 2 docs but write your program in Python 3.
Hash function for a string
Java's String implements hashCode like this:
public int hashCode()
Returns a hash code for this string. The hash code for a String object is computed as
s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1]
using int arithmetic, where s[i] is the ith character of the string, n is the length of the string, and ^ indicates exponentiation. (The hash value of the empty string is zero.)
So something like this:
int HashTable::hash (string word) {
int result = 0;
for(size_t i = 0; i < word.length(); ++i) {
result += word[i] * pow(31, i);
}
return result;
}
How to find the day, month and year with moment.js
If you are looking for answer in string values , try this
var check = moment('date/utc format');
day = check.format('dddd') // => ('Monday' , 'Tuesday' ----)
month = check.format('MMMM') // => ('January','February.....)
year = check.format('YYYY') // => ('2012','2013' ...)
Is there any way to set environment variables in Visual Studio Code?
In the VSCode launch.json you can use "env" and configure all your environment variables there:
{
"version": "0.2.0",
"configurations": [
{
"env": {
"NODE_ENV": "development",
"port":"1337"
},
...
}
]
}
Find and kill a process in one line using bash and regex
I use this to kill Firefox when it's being script slammed and cpu bashing :) Replace 'Firefox' with the app you want to die. I'm on the Bash shell - OS X 10.9.3 Darwin.
kill -Hup $(ps ux | grep Firefox | awk 'NR == 1 {next} {print $2}' | uniq | sort)
Creating a new ArrayList in Java
Fixed the code for you:
ArrayList<Class> myArray= new ArrayList<Class>();
Java: how to use UrlConnection to post request with authorization?
A fine example found here. Powerlord got it right, below, for POST you need HttpURLConnection, instead.
Below is the code to do that,
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
conn.setRequestProperty ("Authorization", encodedCredentials);
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
writer.write(data);
writer.flush();
String line;
BufferedReader reader = new BufferedReader(new
InputStreamReader(conn.getInputStream()));
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
writer.close();
reader.close();
Change URLConnection to HttpURLConnection, to make it POST request.
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
Suggestion (...in comments):
You might need to set these properties too,
conn.setRequestProperty( "Content-type", "application/x-www-form-urlencoded");
conn.setRequestProperty( "Accept", "*/*" );
How can I post data as form data instead of a request payload?
These answers look like insane overkill, sometimes, simple is just better:
$http.post(loginUrl, "userName=" + encodeURIComponent(email) +
"&password=" + encodeURIComponent(password) +
"&grant_type=password"
).success(function (data) {
//...
The developers of this app have not set up this app properly for Facebook Login?
do setup by following bellow link and domain name you need to mention as like wht you have mentioned in facebook app domain name.
Go to https://developers.facebook.com/
Click on the Apps menu on the top bar.
MySQL error 1241: Operand should contain 1 column(s)
Another way to make the parser raise the same exception is the following incorrect clause.
SELECT r.name
FROM roles r
WHERE id IN ( SELECT role_id ,
system_user_id
FROM role_members m
WHERE r.id = m.role_id
AND m.system_user_id = intIdSystemUser
)
The nested SELECT statement in the IN clause returns two columns, which the parser sees as operands, which is technically correct, since the id column matches values from but one column (role_id) in the result returned by the nested select statement, which is expected to return a list.
For sake of completeness, the correct syntax is as follows.
SELECT r.name
FROM roles r
WHERE id IN ( SELECT role_id
FROM role_members m
WHERE r.id = m.role_id
AND m.system_user_id = intIdSystemUser
)
The stored procedure of which this query is a portion not only parsed, but returned the expected result.
What are the rules about using an underscore in a C++ identifier?
Yes, underscores may be used anywhere in an identifier. I believe the rules are: any of a-z, A-Z, _ in the first character and those +0-9 for the following characters.
Underscore prefixes are common in C code -- a single underscore means "private", and double underscores are usually reserved for use by the compiler.
Bitbucket git credentials if signed up with Google
It's March 2019, and I just did it this way:
- Access https://id.atlassian.com/login/resetpassword
- Fill your email and click "Send recovery link"
- You will receive an email, and this is where people mess it up. Don't click the Log in to my account button, instead, you want to click the small link bellow that says Alternatively, you can reset your password for your Atlassian account.
- Set a password as you normally would
Now try to run git commands on terminal.
It might ask you to do a two-step verification the first time, just follow the steps and you're done!
Python - abs vs fabs
math.fabs() always returns float, while abs() may return integer.
How do I recursively delete a directory and its entire contents (files + sub dirs) in PHP?
Enhanced @Artefacto 's solution - corrected typos and simplified code, working for both - empty && non-empty directories .
function recursive_rmdir($dir) {
if( is_dir($dir) ) {
$objects = array_diff( scandir($dir), array('..', '.') );
foreach ($objects as $object) {
$objectPath = $dir."/".$object;
if( is_dir($objectPath) )
recursive_rmdir($objectPath);
else
unlink($objectPath);
}
rmdir($dir);
}
}
Environment variables in Mac OS X
For 2020 Mac OS X Catalina users:
Forget about other useless answers, here only two steps needed:
Create a file with the naming convention: priority-appname. Then copy-paste the path you want to add to
PATH.E.g.
80-vscodewith content/Applications/Visual Studio Code.app/Contents/Resources/app/bin/in my case.Move that file to
/etc/paths.d/. Don't forget to open a new tab(new session) in the Terminal and typeecho $PATHto check that your path is added!
Notice: this method only appends your path to PATH.
How to properly set the 100% DIV height to match document/window height?
You could make it absolute and put zeros to top and bottom that is:
#fullHeightDiv {
position: absolute;
top: 0;
bottom: 0;
}
how to access master page control from content page
If you are trying to access an html element: this is an HTML Anchor...
My nav bar has items that are not list items (<li>) but rather html anchors (<a>)
See below: (This is the site master)
<nav class="mdl-navigation">
<a class="mdl-navigation__link" href="" runat="server" id="liHome">Home</a>
<a class="mdl-navigation__link" href="" runat="server" id="liDashboard">Dashboard</a>
</nav>
Now in your code behind for another page, for mine, it's the login page...
On PageLoad() define this:
HtmlAnchor lblMasterStatus = (HtmlAnchor)Master.FindControl("liHome");
lblMasterStatus.Visible =false;
HtmlAnchor lblMasterStatus1 = (HtmlAnchor)Master.FindControl("liDashboard");
lblMasterStatus1.Visible = false;
Now we have accessed the site masters controls, and have made them invisible on the login page.
Replace invalid values with None in Pandas DataFrame
With Pandas version =1.0.0, I would use DataFrame.replace or Series.replace:
df.replace(old_val, pd.NA, inplace=True)
This is better for two reasons:
- It uses
pd.NAinstead ofNoneornp.nan. - It replaces the value in-place which could be more memory efficient.
How do I create a random alpha-numeric string in C++?
Here's a funny one-liner. Needs ASCII.
void gen_random(char *s, int l) {
for (int c; c=rand()%62, *s++ = (c+"07="[(c+16)/26])*(l-->0););
}
`React/RCTBridgeModule.h` file not found
Go to iOS folder in your project and install pod -
$ pod install
If you are getting any error in installation of pod type command-
$ xcode-select -p
Result should be - /Applications/Xcode.app/Contents/Developer
If the path is incorrect then open your iOS project in Xcode and go to: Xcode->preferences->command line tools-> select Xcode
And again install the pod your issue will be fixed.
Checking if an object is null in C#
Here are some extensions I use:
/// <summary>
/// Extensions to the object class
/// </summary>
public static class ObjectExtensions
{
/// <summary>
/// True if the object is null, else false
/// </summary>
public static bool IsNull(this object input) => input is null;
/// <summary>
/// False if the object is null, else true
/// </summary>
public static bool NotNull(this object input) => !IsNull(input);
}
how to set active class to nav menu from twitter bootstrap
You can use this JavaScript\jQuery code:
// Sets active link in Bootstrap menu
// Add this code in a central place used\shared by all pages
// like your _Layout.cshtml in ASP.NET MVC for example
$('a[href="' + this.location.pathname + '"]').parents('li,ul').addClass('active');
It'll set the <a>'s parent <li> and the <li>'s parent <ul> as active.
A simple solution that works!
Original source:
How do you count the elements of an array in java
You can declare an array of booleans with the same length of your array:
true: is used
false: is not used
and change the value of the same cell number to true. Then you can count how many cells are used by using a for loop.
bash string equality
There's no difference, == is a synonym for = (for the C/C++ people, I assume). See here, for example.
You could double-check just to be really sure or just for your interest by looking at the bash source code, should be somewhere in the parsing code there, but I couldn't find it straightaway.
Best way to convert IList or IEnumerable to Array
Put the following in your .cs file:
using System.Linq;
You will then be able to use the following extension method from System.Linq.Enumerable:
public static TSource[] ToArray<TSource>(this System.Collections.Generic.IEnumerable<TSource> source)
I.e.
IEnumerable<object> query = ...;
object[] bob = query.ToArray();
Can a foreign key be NULL and/or duplicate?
Can a Foreign key be NULL?
Existing answers focused on single column scenario. If we consider multi column foreign key we have more options using MATCH [SIMPLE | PARTIAL | FULL] clause defined in SQL Standard:
A value inserted into the referencing column(s) is matched against the values of the referenced table and referenced columns using the given match type. There are three match types: MATCH FULL, MATCH PARTIAL, and MATCH SIMPLE (which is the default). MATCH FULL will not allow one column of a multicolumn foreign key to be null unless all foreign key columns are null; if they are all null, the row is not required to have a match in the referenced table. MATCH SIMPLE allows any of the foreign key columns to be null; if any of them are null, the row is not required to have a match in the referenced table. MATCH PARTIAL is not yet implemented.
(Of course, NOT NULL constraints can be applied to the referencing column(s) to prevent these cases from arising.)
Example:
CREATE TABLE A(a VARCHAR(10), b VARCHAR(10), d DATE , UNIQUE(a,b));
INSERT INTO A(a, b, d)
VALUES (NULL, NULL, NOW()),('a', NULL, NOW()),(NULL, 'b', NOW()),('c', 'b', NOW());
CREATE TABLE B(id INT PRIMARY KEY, ref_a VARCHAR(10), ref_b VARCHAR(10));
-- MATCH SIMPLE - default behaviour nulls are allowed
ALTER TABLE B ADD CONSTRAINT B_Fk FOREIGN KEY (ref_a, ref_b)
REFERENCES A(a,b) MATCH SIMPLE;
INSERT INTO B(id, ref_a, ref_b) VALUES (1, NULL, 'b');
-- (NULL/'x') 'x' value does not exists in A table, but insert is valid
INSERT INTO B(id, ref_a, ref_b) VALUES (2, NULL, 'x');
ALTER TABLE B DROP CONSTRAINT IF EXISTS B_Fk; -- cleanup
-- MATCH PARTIAL - not implemented
ALTER TABLE B ADD CONSTRAINT B_Fk FOREIGN KEY (ref_a, ref_b)
REFERENCES A(a,b) MATCH PARTIAL;
-- ERROR: MATCH PARTIAL not yet implemented
DELETE FROM B; ALTER TABLE B DROP CONSTRAINT IF EXISTS B_Fk; -- cleanup
-- MATCH FULL nulls are not allowed
ALTER TABLE B ADD CONSTRAINT B_Fk FOREIGN KEY (ref_a, ref_b)
REFERENCES A(a,b) MATCH FULL;
-- FK is defined, inserting NULL as part of FK
INSERT INTO B(id, ref_a, ref_b) VALUES (1, NULL, 'b');
-- ERROR: MATCH FULL does not allow mixing of null and nonnull key values.
-- FK is defined, inserting all NULLs - valid
INSERT INTO B(id, ref_a, ref_b) VALUES (1, NULL, NULL);
How to force Laravel Project to use HTTPS for all routes?
Place this in the AppServiceProvider in the boot() method
if($this->app->environment('production')) {
\URL::forceScheme('https');
}
What's the difference between & and && in MATLAB?
Both are logical AND operations. The && though, is a "short-circuit" operator. From the MATLAB docs:
They are short-circuit operators in that they evaluate their second operand only when the result is not fully determined by the first operand.
See more here.
Run text file as commands in Bash
you can also just run it with a shell, for example:
bash example.txt
sh example.txt
How to run vbs as administrator from vbs?
If UAC is enabled on the computer, something like this should work:
If Not WScript.Arguments.Named.Exists("elevate") Then
CreateObject("Shell.Application").ShellExecute WScript.FullName _
, """" & WScript.ScriptFullName & """ /elevate", "", "runas", 1
WScript.Quit
End If
'actual code
How to create a floating action button (FAB) in android, using AppCompat v21?
There is no longer a need for creating your own FAB nor using a third party library, it was included in AppCompat 22.
https://developer.android.com/reference/android/support/design/widget/FloatingActionButton.html
Just add the new support library called design in in your gradle-file:
compile 'com.android.support:design:22.2.0'
...and you are good to go:
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_margin="16dp"
android:clickable="true"
android:src="@drawable/ic_happy_image" />
How to find the port for MS SQL Server 2008?
You could also look with a
netstat -abn
It gives the ports with the corresponding application that keeps them open.
Edit: or TCPView.
Converting json results to a date
If that number represents milliseconds, use the Date's constructor :
var myDate = new Date(1238540400000);
How can I use UIColorFromRGB in Swift?
adding a swift 3 option:
cell.layer.borderColor = UIColor (red: 192.0/255.0, green: 192.0/255.0, blue: 197/255.0, alpha: 1.0).cgColor
PHP Accessing Parent Class Variable
all the properties and methods of the parent class is inherited in the child class so theoretically you can access them in the child class but beware using the protected keyword in your class because it throws a fatal error when used in the child class.
as mentioned in php.net
The visibility of a property or method can be defined by prefixing the declaration with the keywords public, protected or private. Class members declared public can be accessed everywhere. Members declared protected can be accessed only within the class itself and by inherited and parent classes. Members declared as private may only be accessed by the class that defines the member.
How to check if a number is a power of 2
This is another method to do it as well
package javacore;
import java.util.Scanner;
public class Main_exercise5 {
public static void main(String[] args) {
// Local Declaration
boolean ispoweroftwo = false;
int n;
Scanner input = new Scanner (System.in);
System.out.println("Enter a number");
n = input.nextInt();
ispoweroftwo = checkNumber(n);
System.out.println(ispoweroftwo);
}
public static boolean checkNumber(int n) {
// Function declaration
boolean ispoweroftwo= false;
// if not divisible by 2, means isnotpoweroftwo
if(n%2!=0){
ispoweroftwo=false;
return ispoweroftwo;
}
else {
for(int power=1; power>0; power=power<<1) {
if (power==n) {
return true;
}
else if (power>n) {
return false;
}
}
}
return ispoweroftwo;
}
}
setting textColor in TextView in layout/main.xml main layout file not referencing colors.xml file. (It wants a #RRGGBB instead of @color/text_color)
After experimenting on that case:
android:textColor="@colors/text_color" is wrong since @color is not filename dependant. You can name your resource file foobar.xml, it doesn't matter but if you have defined some colors in it you can access them using @color/some_color.
Update:
file location: res/values/colors.xml The filename is arbitrary. The element's name will be used as the resource ID. (Source)
Unstaged changes left after git reset --hard
try to simply git restore .
That's what git says & it's working
What are .iml files in Android Studio?
Add .idea and *.iml to .gitignore, you don't need those files to successfully import and compile the project.
How to implement endless list with RecyclerView?
Thanks to @Kushal and this is how I implemented it
private boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (dy > 0) { //check for scroll down
visibleItemCount = mLayoutManager.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loading = false;
Log.v("...", "Last Item Wow !");
// Do pagination.. i.e. fetch new data
loading = true;
}
}
}
}
});
Don't forget to add
LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
How do I get the SharedPreferences from a PreferenceActivity in Android?
Declare these methods first..
public static void putPref(String key, String value, Context context) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor editor = prefs.edit();
editor.putString(key, value);
editor.commit();
}
public static String getPref(String key, Context context) {
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
return preferences.getString(key, null);
}
Then call this when you want to put a pref:
putPref("myKey", "mystring", getApplicationContext());
call this when you want to get a pref:
getPref("myKey", getApplicationContext());
Or you can use this object https://github.com/kcochibili/TinyDB--Android-Shared-Preferences-Turbo which simplifies everything even further
Example:
TinyDB tinydb = new TinyDB(context);
tinydb.putInt("clickCount", 2);
tinydb.putFloat("xPoint", 3.6f);
tinydb.putLong("userCount", 39832L);
tinydb.putString("userName", "john");
tinydb.putBoolean("isUserMale", true);
tinydb.putList("MyUsers", mUsersArray);
tinydb.putImagePNG("DropBox/WorkImages", "MeAtlunch.png", lunchBitmap);
Detect if device is iOS
var isiOSSafari = (navigator.userAgent.match(/like Mac OS X/i)) ? true: false;
Comparing two branches in Git?
git diff branch_1..branch_2
That will produce the diff between the tips of the two branches. If you'd prefer to find the diff from their common ancestor to test, you can use three dots instead of two:
git diff branch_1...branch_2
Generating random number between 1 and 10 in Bash Shell Script
You can also use /dev/urandom:
grep -m1 -ao '[0-9]' /dev/urandom | sed s/0/10/ | head -n1
Alter table to modify default value of column
Your belief about what will happen is not correct. Setting a default value for a column will not affect the existing data in the table.
I create a table with a column col2 that has no default value
SQL> create table foo(
2 col1 number primary key,
3 col2 varchar2(10)
4 );
Table created.
SQL> insert into foo( col1 ) values (1);
1 row created.
SQL> insert into foo( col1 ) values (2);
1 row created.
SQL> insert into foo( col1 ) values (3);
1 row created.
SQL> select * from foo;
COL1 COL2
---------- ----------
1
2
3
If I then alter the table to set a default value, nothing about the existing rows will change
SQL> alter table foo
2 modify( col2 varchar2(10) default 'foo' );
Table altered.
SQL> select * from foo;
COL1 COL2
---------- ----------
1
2
3
SQL> insert into foo( col1 ) values (4);
1 row created.
SQL> select * from foo;
COL1 COL2
---------- ----------
1
2
3
4 foo
Even if I subsequently change the default again, there will still be no change to the existing rows
SQL> alter table foo
2 modify( col2 varchar2(10) default 'bar' );
Table altered.
SQL> select * from foo;
COL1 COL2
---------- ----------
1
2
3
4 foo
SQL> insert into foo( col1 ) values (5);
1 row created.
SQL> select * from foo;
COL1 COL2
---------- ----------
1
2
3
4 foo
5 bar
Remove certain characters from a string
One issue with REPLACE will be where city names contain the district name. You can use something like.
SELECT SUBSTRING(O.Ort, LEN(C.CityName) + 2, 8000)
FROM dbo.tblOrtsteileGeo O
JOIN dbo.Cities C
ON C.foo = O.foo
WHERE O.GKZ = '06440004'
Android Closing Activity Programmatically
you can use finishAffinity(); to close all the activity..
Creating an array of objects in Java
Here is the clear example of creating array of 10 employee objects, with a constructor that takes parameter:
public class MainClass
{
public static void main(String args[])
{
System.out.println("Hello, World!");
//step1 : first create array of 10 elements that holds object addresses.
Emp[] employees = new Emp[10];
//step2 : now create objects in a loop.
for(int i=0; i<employees.length; i++){
employees[i] = new Emp(i+1);//this will call constructor.
}
}
}
class Emp{
int eno;
public Emp(int no){
eno = no;
System.out.println("emp constructor called..eno is.."+eno);
}
}
Allowed memory size of 33554432 bytes exhausted (tried to allocate 43148176 bytes) in php
Write
ini_set('memory_limit', '-1');
in your index.php at the top after opening of php tag
Apache is downloading php files instead of displaying them
I had a similar problem to the OP when upgrading php5 from an older version, to 5.5.9, which is the version installed with Mint 17.
I'm running a LAMP setup on a machine on my local network, which I use to preview changes to websites before I upload those changes to the actual live server. So I maintain a perfect local mirror of the actual site.
After the upgrade, files which run and display perfectly on the actual site would not display, or would only display html on the local machine. PHP was not parsed. The phpinfo() command worked, so I knew php was otherwise working. The log generated no errors. Viewing the page source showed me the actual php code.
I had constructed a test.php page that contained the following code:
<?php
phpinfo();
?>
This worked. Then I discovered when I changed <?php to <? the command no longer worked. All my php sites use <? instead of <?php which might not be ideal, but it's the reality. I fixed the problem by going to /etc/php5/apache2 , searching for "short_open_tag" and changing the value from Off to On.
how to copy only the columns in a DataTable to another DataTable?
The DataTable.Clone() method works great when you want to create a completely new DataTable, but there might be cases where you would want to add the schema columns from one DataTable to another existing DataTable.
For example, if you've derived a new subclass from DataTable, and want to import schema information into it, you couldn't use Clone().
E.g.:
public class CoolNewTable : DataTable {
public void FillFromReader(DbDataReader reader) {
// We want to get the schema information (i.e. columns) from the
// DbDataReader and
// import it into *this* DataTable, NOT a new one.
DataTable schema = reader.GetSchemaTable();
//GetSchemaTable() returns a DataTable with the columns we want.
ImportSchema(this, schema); // <--- how do we do this?
}
}
The answer is just to create new DataColumns in the existing DataTable using the schema table's columns as templates.
I.e. the code for ImportSchema would be something like this:
void ImportSchema(DataTable dest, DataTable source) {
foreach(var c in source.Columns)
dest.Columns.Add(c);
}
or, if you're using Linq:
void ImportSchema(DataTable dest, DataTable source) {
var cols = source.Columns.Cast<DataColumn>().ToArray();
dest.Columns.AddRange(cols);
}
This was just one example of a situation where you might want to copy schema/columns from one DataTable into another one without using Clone() to create a completely new DataTable. I'm sure I've come across several others as well.
javascript if number greater than number
You're comparing strings. JavaScript compares the ASCII code for each character of the string.
To see why you get false, look at the charCodes:
"1300".charCodeAt(0);
49
"999".charCodeAt(0);
57
The comparison is false because, when comparing the strings, the character codes for 1 is not greater than that of 9.
The fix is to treat the strings as numbers. You can use a number of methods:
parseInt(string, radix)
parseInt("1300", 10);
> 1300 - notice the lack of quotes
+"1300"
> 1300
Number("1300")
> 1300
TypeError: Object of type 'bytes' is not JSON serializable
I was dealing with this issue today, and I knew that I had something encoded as a bytes object that I was trying to serialize as json with json.dump(my_json_object, write_to_file.json). my_json_object in this case was a very large json object that I had created, so I had several dicts, lists, and strings to look at to find what was still in bytes format.
The way I ended up solving it: the write_to_file.json will have everything up to the bytes object that is causing the issue.
In my particular case this was a line obtained through
for line in text:
json_object['line'] = line.strip()
I solved by first finding this error with the help of the write_to_file.json, then by correcting it to:
for line in text:
json_object['line'] = line.strip().decode()
WordPress query single post by slug
As wordpress api has changed, you can´t use get_posts with param 'post_name'. I´ve modified Maartens function a bit:
function get_post_id_by_slug( $slug, $post_type = "post" ) {
$query = new WP_Query(
array(
'name' => $slug,
'post_type' => $post_type,
'numberposts' => 1,
'fields' => 'ids',
) );
$posts = $query->get_posts();
return array_shift( $posts );
}
Import Error: No module named numpy
I'm not sure exactly why I was getting the error, but pip3 uninstall numpy then pip3 install numpy resolved the issue for me.
Is there a css cross-browser value for "width: -moz-fit-content;"?
I use these:
.right {display:table; margin:-18px 0 0 auto;}
.center {display:table; margin:-18px auto 0 auto;}
How to map with index in Ruby?
A fun, but useless way to do this:
az = ('a'..'z').to_a
azz = az.map{|e| [e, az.index(e)+2]}
Use jquery click to handle anchor onClick()
<div class = "solTitle"> <a href = "#" id = "solution0" onClick = "openSolution();">Solution0 </a></div> <br>
<div class= "solTitle"> <a href = "#" id = "solution1" onClick = "openSolution();">Solution1 </a></div> <br>
$(document).ready(function(){
$('.solTitle a').click(function(e) {
e.preventDefault();
alert('here in');
var divId = 'summary' +$(this).attr('id');
document.getElementById(divId).className = ''; /* or $('#'+divid).removeAttr('class'); */
});
});
I changed few things:
- remove the onclick attr and bind click event inside the document.ready
- changed solTitle to be an ID to a CLASS: id cant be repeated
write() versus writelines() and concatenated strings
Exercise 16 from Zed Shaw's book? You can use escape characters as follows:
paragraph1 = "%s \n %s \n %s \n" % (line1, line2, line3)
target.write(paragraph1)
target.close()
Should I URL-encode POST data?
General Answer
The general answer to your question is that it depends. And you get to decide by specifying what your "Content-Type" is in the HTTP headers.
A value of "application/x-www-form-urlencoded" means that your POST body will need to be URL encoded just like a GET parameter string. A value of "multipart/form-data" means that you'll be using content delimiters and NOT url encoding the content.
This answer has a much more thorough explanation if you'd like more information.
Specific Answer
For an answer specific to the PHP libraries you're using (CURL), you should read the documentation here.
Here's the relevant information:
CURLOPT_POST
TRUE to do a regular HTTP POST. This POST is the normal application/x-www-form-urlencoded kind, most commonly used by HTML forms.
CURLOPT_POSTFIELDS
The full data to post in a HTTP "POST" operation. To post a file, prepend a filename with @ and use the full path. The filetype can be explicitly specified by following the filename with the type in the format ';type=mimetype'. This parameter can either be passed as a urlencoded string like 'para1=val1¶2=val2&...' or as an array with the field name as key and field data as value. If value is an array, the Content-Type header will be set to multipart/form-data. As of PHP 5.2.0, value must be an array if files are passed to this option with the @ prefix.
JQuery DatePicker ReadOnly
All of the listed solutions give a mediocre user experience or cause issues if you want to re-enable the datepicker with it's settings in-tact. I used a method similar to making a select read-only, which is to disable it but add a hidden field with the same name. Check it:
Usage:
$("#datepicker").readonlyDatepicker(true); //makes the datepicker readonly
$("#datepicker").readonlyDatepicker(false); //makes the datepicker editable again
jQuery function:
$.fn.readonlyDatepicker = function (makeReadonly) {
$(this).each(function(){
//find corresponding hidden field
var name = $(this).attr('name');
var $hidden = $('input[name="' + name + '"][type="hidden"]');
//if it doesn't exist, create it
if ($hidden.length === 0){
$hidden = $('<input type="hidden" name="' + name + '"/>');
$hidden.insertAfter($(this));
}
if (makeReadonly){
$hidden.val($(this).val());
$(this).unbind('change.readonly');
$(this).attr('disabled', true);
}
else{
$(this).bind('change.readonly', function(){
$hidden.val($(this).val());
});
$(this).attr('disabled', false);
}
});
};
What is the default root pasword for MySQL 5.7
After a lot of try, I could reset the default password with the following commands (Ubuntu and derivatives):
sudo -i
mkdir -p /var/run/mysqld
chown mysql:mysql /var/run/mysqld
/etc/init.d/mysql stop
mysqld_safe --skip-grant-tables &
mysql -uroot
use mysql;
update user set authentication_string=password('YOURPASSWORD') where user='root';
update user set plugin="mysql_native_password" where User='root';
flush privileges;
quit;
sudo /etc/init.d/mysql stop
sudo /etc/init.d/mysql start
Sometimes, even after typed in the terminal
mkdir -p /var/run/mysqld
chown mysql:mysql /var/run/mysqld
/etc/init.d/mysql stop
mysqld_safe --skip-grant-tables &
I got the error that the mysqld don't exists. So, quit, and type the same commands again.
And the final command
sudo /etc/init.d/mysql start
Sometimes doesn't work. Only after restart the computer.
How to solve Notice: Undefined index: id in C:\xampp\htdocs\invmgt\manufactured_goods\change.php on line 21
Simply add this
$id = '';
if( isset( $_GET['id'])) {
$id = $_GET['id'];
}
What is the difference between resource and endpoint?
The terms resource and endpoint are often used synonymously. But in fact they do not mean the same thing.
The term endpoint is focused on the URL that is used to make a request.
The term resource is focused on the data set that is returned by a request.
Now, the same resource can often be accessed by multiple different endpoints.
Also the same endpoint can return different resources, depending on a query string.
Let us see some examples:
Different endpoints accessing the same resource
Have a look at the following examples of different endpoints:
/api/companies/5/employees/3
/api/v2/companies/5/employees/3
/api/employees/3
They obviously could all access the very same resource in a given API.
Also an existing API could be changed completely. This could lead to new endpoints that would access the same old resources using totally new and different URLs:
/api/employees/3
/new_api/staff/3
One endpoint accessing different resources
If your endpoint returns a collection, you could implement searching/filtering/sorting using query strings. As a result the following URLs all use the same endpoint (/api/companies), but they can return different resources (or resource collections, which by definition are resources in themselves):
/api/companies
/api/companies?sort=name_asc
/api/companies?location=germany
/api/companies?search=siemens
android: data binding error: cannot find symbol class
I fell into this issue because my Activity was called MainActivityMVVM and the Binding was converted into MainActivityMvvmBinding instead of MainActivityMVVMBinding. After digging into the generated classes I found the issue.
counting number of directories in a specific directory
Some useful examples:
count files in current dir
/bin/ls -lA | egrep -c '^-'
count dirs in current dir
/bin/ls -lA | egrep -c '^d'
count files and dirs in current dir
/bin/ls -lA | egrep -c '^-|^d'
count files and dirs in in one subdirectory
/bin/ls -lA subdir_name/ | egrep -c '^-|^d'
I have noticed a strange thing (at least in my case) :
When I have tried with
lsinstead/bin/lsthe-Aparameterdo not list implied . and ..NOT WORK as espected. When I uselsthat show ./ and ../ So that result wrong count. SOLUTION :/bin/lsinsteadls
CSS scale down image to fit in containing div, without specifing original size
It's very simple. Just Set width of img to 100%
Jackson serialization: ignore empty values (or null)
Or you can use GSON [https://code.google.com/p/google-gson/], where these null fields will be automatically removed.
SampleDTO.java
public class SampleDTO {
String username;
String email;
String password;
String birthday;
String coinsPackage;
String coins;
String transactionId;
boolean isLoggedIn;
// getters/setters
}
Test.java
import com.google.gson.Gson;
public class Test {
public static void main(String[] args) {
SampleDTO objSampleDTO = new SampleDTO();
Gson objGson = new Gson();
System.out.println(objGson.toJson(objSampleDTO));
}
}
OUTPUT:
{"isLoggedIn":false}
I used gson-2.2.4
Extract time from date String
Use SimpleDateFormat to convert between a date string and a real Date object. with a Date as starting point, you can easily apply formatting based on various patterns as definied in the javadoc of the SimpleDateFormat (click the blue code link for the Javadoc).
Here's a kickoff example:
String originalString = "2010-07-14 09:00:02";
Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(originalString);
String newString = new SimpleDateFormat("H:mm").format(date); // 9:00
CSS transition between left -> right and top -> bottom positions
This worked for me on Chromium. The % for translate is in reference to the size of the bounding box of the element it is applied to so it perfectly gets the element to the lower right edge while not having to switch which property is used to specify it's location.
topleft {
top: 0%;
left: 0%;
}
bottomright {
top: 100%;
left: 100%;
-webkit-transform: translate(-100%,-100%);
}
Google Maps Api v3 - find nearest markers
First you have to add the eventlistener
google.maps.event.addListener(map, 'click', find_closest_marker);
Then create a function that loops through the array of markers and uses the haversine formula to calculate the distance of each marker from the click.
function rad(x) {return x*Math.PI/180;}
function find_closest_marker( event ) {
var lat = event.latLng.lat();
var lng = event.latLng.lng();
var R = 6371; // radius of earth in km
var distances = [];
var closest = -1;
for( i=0;i<map.markers.length; i++ ) {
var mlat = map.markers[i].position.lat();
var mlng = map.markers[i].position.lng();
var dLat = rad(mlat - lat);
var dLong = rad(mlng - lng);
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(rad(lat)) * Math.cos(rad(lat)) * Math.sin(dLong/2) * Math.sin(dLong/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;
distances[i] = d;
if ( closest == -1 || d < distances[closest] ) {
closest = i;
}
}
alert(map.markers[closest].title);
}
This keeps track of the closest markers and alerts its title.
I have my markers as an array on my map object
Collections.emptyList() vs. new instance
Use Collections.emptyList() if you want to make sure that the returned list is never modified.
This is what is returned on calling emptyList():
/**
* The empty list (immutable).
*/
public static final List EMPTY_LIST = new EmptyList();
How to set app icon for Electron / Atom Shell App
electron-packager
Setting the icon property when creating the
BrowserWindow only has an effect on Windows and Linux platforms. you have to package the .icns for max
To set the icon on OS X using electron-packager, set the icon using the --icon switch.
It will need to be in .icns format for OS X. There is an online icon converter which can create this file from your .png.
electron-builder
As a most recent solution, I found an alternative of using
--icon switch. Here is what you can do.
- Create a directory named
buildin your project directory and put the.icnsthe icon in the directory as namedicon.icns. - run builder by executing command
electron-builder --dir.
You will find your application icon will be automatically picked up from that directory location and used for an application while packaging.
Note: The given answer is for recent version of
electron-builderand tested with electron-builder v21.2.0
Set left margin for a paragraph in html
<p style="margin-left:5em;">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut lacinia vestibulum quam sit amet aliquet. Phasellus tempor nisi eget tellus venenatis tempus. Aliquam dapibus porttitor convallis. Praesent pretium luctus orci, quis ullamcorper lacus lacinia a. Integer eget molestie purus. Vestibulum porta mollis tempus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. </p>
That'll do it, there's a few improvements obviously, but that's the basics. And I use 'em' as the measurement, you may want to use other units, like 'px'.
EDIT: What they're describing above is a way of associating groups of styles, or classes, with elements on a web page. You can implement that in a few ways, here's one which may suit you:
In your HTML page, containing the <p> tagged content from your DB add in a new 'style' node and wrap the styles you want to declare in a class like so:
<head>
<style type="text/css">
p { margin-left:5em; /* Or another measurement unit, like px */ }
</style>
</head>
<body>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut lacinia vestibulum quam sit amet aliquet.</p>
</body>
So above, all <p> elements in your document will have that style rule applied. Perhaps you are pumping your paragraph content into a container of some sort? Try this:
<head>
<style type="text/css">
.container p { margin-left:5em; /* Or another measurement unit, like px */ }
</style>
</head>
<body>
<div class="container">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut lacinia vestibulum quam sit amet aliquet.</p>
</div>
<p>Vestibulum porta mollis tempus. Class aptent taciti sociosqu ad litora torquent per conubia nostra.</p>
</body>
In the example above, only the <p> element inside the div, whose class name is 'container', will have the styles applied - and not the <p> element outside the container.
In addition to the above, you can collect your styles together and remove the style element from the <head> tag, replacing it with a <link> tag, which points to an external CSS file. This external file is where you'd now put your <p> tag styles. This concept is known as 'seperating content from style' and is considered good practice, and is also an extendible way to create styles, and can help with low maintenance.
How to list active / open connections in Oracle?
The following gives you list of operating system users sorted by number of connections, which is useful when looking for excessive resource usage.
select osuser, count(*) as active_conn_count
from v$session
group by osuser
order by active_conn_count desc
Secure FTP using Windows batch script
First, make sure you understand, if you need to use Secure FTP (=FTPS, as per your text) or SFTP (as per tag you have used).
Neither is supported by Windows command-line ftp.exe. As you have suggested, you can use WinSCP. It supports both FTPS and SFTP.
Using WinSCP, your batch file would look like (for SFTP):
echo open sftp://ftp_user:[email protected] -hostkey="server's hostkey" >> ftpcmd.dat
echo put c:\directory\%1-export-%date%.csv >> ftpcmd.dat
echo exit >> ftpcmd.dat
winscp.com /script=ftpcmd.dat
del ftpcmd.dat
And the batch file:
winscp.com /log=ftpcmd.log /script=ftpcmd.dat /parameter %1 %date%
Though using all capabilities of WinSCP (particularly providing commands directly on command-line and the %TIMESTAMP% syntax), the batch file simplifies to:
winscp.com /log=ftpcmd.log /command ^
"open sftp://ftp_user:[email protected] -hostkey=""server's hostkey""" ^
"put c:\directory\%1-export-%%TIMESTAMP#yyyymmdd%%.csv" ^
"exit"
For the purpose of -hostkey switch, see verifying the host key in script.
Easier than assembling the script/batch file manually is to setup and test the connection settings in WinSCP GUI and then have it generate the script or batch file for you:
All you need to tweak is the source file name (use the %TIMESTAMP% syntax as shown previously) and the path to the log file.
For FTPS, replace the sftp:// in the open command with ftpes:// (explicit TLS/SSL) or ftps:// (implicit TLS/SSL). Remove the -hostkey switch.
winscp.com /log=ftpcmd.log /command ^
"open ftps://ftp_user:[email protected] -explicit" ^
"put c:\directory\%1-export-%%TIMESTAMP#yyyymmdd%%.csv" ^
"exit"
You may need to add the -certificate switch, if your server's certificate is not issued by a trusted authority.
Again, as with the SFTP, easier is to setup and test the connection settings in WinSCP GUI and then have it generate the script or batch file for you.
See a complete conversion guide from ftp.exe to WinSCP.
You should also read the Guide to automating file transfers to FTP server or SFTP server.
Note to using %TIMESTAMP#yyyymmdd% instead of %date%: A format of %date% variable value is locale-specific. So make sure you test the script on the same locale you are actually going to use the script on. For example on my Czech locale the %date% resolves to ct 06. 11. 2014, what might be problematic when used as a part of a file name.
For this reason WinSCP supports (locale-neutral) timestamp formatting natively. For example %TIMESTAMP#yyyymmdd% resolves to 20170515 on any locale.
(I'm the author of WinSCP)
Read the current full URL with React?
As somebody else mentioned, first you need react-router package. But location object that it provides you with contains parsed url.
But if you want full url badly without accessing global variables, I believe the fastest way to do that would be
...
const getA = memoize(() => document.createElement('a'));
const getCleanA = () => Object.assign(getA(), { href: '' });
const MyComponent = ({ location }) => {
const { href } = Object.assign(getCleanA(), location);
...
href is the one containing a full url.
For memoize I usually use lodash, it's implemented that way mostly to avoid creating new element without necessity.
P.S.: Of course is you're not restricted by ancient browsers you might want to try new URL() thing, but basically entire situation is more or less pointless, because you access global variable in one or another way. So why not to use window.location.href instead?
Remove space above and below <p> tag HTML
<p> elements generally have margins and / or padding. You can set those to zero in a stylesheet.
li p {
margin: 0;
padding: 0;
}
Semantically speaking, however, it is fairly unusual to have a list of paragraphs.
How to split large text file in windows?
you can split using a third party software http://www.hjsplit.org/, for example give yours input that could be upto 9GB and then split, in my case I split 10 MB each
Are there any style options for the HTML5 Date picker?
I used a combination of the above solutions and some trial and error to come to this solution. Took me an annoying amount of time so I hope this can help someone else in the future. I also noticed that the date picker input is not at all supported by Safari...
I am using styled-components to render a transparent date picker input as shown in the image below:
const StyledInput = styled.input`
appearance: none;
box-sizing: border-box;
border: 1px solid black;
background: transparent;
font-size: 1.5rem;
padding: 8px;
::-webkit-datetime-edit-text { padding: 0 2rem; }
::-webkit-datetime-edit-month-field { text-transform: uppercase; }
::-webkit-datetime-edit-day-field { text-transform: uppercase; }
::-webkit-datetime-edit-year-field { text-transform: uppercase; }
::-webkit-inner-spin-button { display: none; }
::-webkit-calendar-picker-indicator { background: transparent;}
`
How can I enable MySQL's slow query log without restarting MySQL?
Find log enabled or not?
SHOW VARIABLES LIKE '%log%';
Set the logs:-
SET GLOBAL general_log = 'ON';
SET GLOBAL slow_query_log = 'ON';
AngularJS - Binding radio buttons to models with boolean values
The way your radios are set up in the fiddle - sharing the same model - will cause only the last group to show a checked radio if you decide to quote all of the truthy values. A more solid approach will involve giving the individual groups their own model, and set the value as a unique attribute of the radios, such as the id:
$scope.radioMod = 1;
$scope.radioMod2 = 2;
Here is a representation of the new html:
<label data-ng-repeat="choice2 in question2.choices">
<input type="radio" name="response2" data-ng-model="radioMod2" value="{{choice2.id}}"/>
{{choice2.text}}
</label>
Bootstrap button drop-down inside responsive table not visible because of scroll
In my case, this works fine:
.table-responsive {
overflow-y: visible !important;
}
How can I make PHP display the error instead of giving me 500 Internal Server Error
Check the error_reporting, display_errors and display_startup_errors settings in your php.ini file. They should be set to E_ALL and "On" respectively (though you should not use display_errors on a production server, so disable this and use log_errors instead if/when you deploy it). You can also change these settings (except display_startup_errors) at the very beginning of your script to set them at runtime (though you may not catch all errors this way):
error_reporting(E_ALL);
ini_set('display_errors', 'On');
After that, restart server.
Is it possible to disable floating headers in UITableView with UITableViewStylePlain?
The interesting thing about UITableViewStyleGrouped is that the tableView adds the style to the cells and not to the TableView.
The style is added as backgroundView to the cells as a class called UIGroupTableViewCellBackground which handles drawing different background according to the position of the cell in the section.
So a very simple solution will be to use UITableViewStyleGrouped, set the backgroundColor of the table to clearColor, and simply replace the backgroundView of the cell in cellForRow:
cell.backgroundView = [[[UIView alloc] initWithFrame:cell.bounds] autorelease];
Grab a segment of an array in Java without creating a new array on heap
Disclaimer: This answer does not conform to the constraints of the question:
I don't want to have to create a new byte array in the heap memory just to do that.
(Honestly, I feel my answer is worthy of deletion. The answer by @unique72 is correct. Imma let this edit sit for a bit and then I shall delete this answer.)
I don't know of a way to do this directly with arrays without additional heap allocation, but the other answers using a sub-list wrapper have additional allocation for the wrapper only – but not the array – which would be useful in the case of a large array.
That said, if one is looking for brevity, the utility method Arrays.copyOfRange() was introduced in Java 6 (late 2006?):
byte [] a = new byte [] {0, 1, 2, 3, 4, 5, 6, 7};
// get a[4], a[5]
byte [] subArray = Arrays.copyOfRange(a, 4, 6);
What are my options for storing data when using React Native? (iOS and Android)
Folks above hit the right notes for storage, though if you also need to consider any PII data that needs to be stored then you can also stash into the keychain using something like https://github.com/oblador/react-native-keychain since ASyncStorage is unencrypted. It can be applied as part of the persist configuration in something like redux-persist.
ng-if check if array is empty
post.capabilities.items will still be defined because it's an empty array, if you check post.capabilities.items.length it should work fine because 0 is falsy.
Why does z-index not work?
In many cases an element must be positioned for z-index to work.
Indeed, applying position: relative to the elements in the question would likely solve the problem (but there's not enough code provided to know for sure).
Actually, position: fixed, position: absolute and position: sticky will also enable z-index, but those values also change the layout. With position: relative the layout isn't disturbed.
Essentially, as long as the element isn't position: static (the default setting) it is considered positioned and z-index will work.
Many answers to "Why isn't z-index working?" questions assert that z-index only works on positioned elements. As of CSS3, this is no longer true.
Elements that are flex items or grid items can use z-index even when position is static.
From the specs:
Flex items paint exactly the same as inline blocks, except that order-modified document order is used in place of raw document order, and
z-indexvalues other thanautocreate a stacking context even ifpositionisstatic.5.4. Z-axis Ordering: the
z-indexpropertyThe painting order of grid items is exactly the same as inline blocks, except that order-modified document order is used in place of raw document order, and
z-indexvalues other thanautocreate a stacking context even ifpositionisstatic.
Here's a demonstration of z-index working on non-positioned flex items: https://jsfiddle.net/m0wddwxs/
Android - Get value from HashMap
HashMap<String, String> meMap=new HashMap<String, String>();
meMap.put("Color1","Red");
meMap.put("Color2","Blue");
meMap.put("Color3","Green");
meMap.put("Color4","White");
Iterator iterator = meMap.keySet().iterator();
while( iterator. hasNext() ){
Toast.makeText(getBaseContext(), meMap.get(iterator.next().toString()),
Toast.LENGTH_SHORT).show();
}
Access VBA | How to replace parts of a string with another string
I was reading this thread and would like to add information even though it is surely no longer timely for the OP.
BiggerDon above points out the difficulty of rote replacing "North" with "N". A similar problem exists with "Avenue" to "Ave" (e.g. "Avenue of the Americas" becomes "Ave of the Americas": still understandable, but probably not what the OP wants.
The replace() function is entirely context-free, but addresses are not. A complete solution needs to have additional logic to interpret the context correctly, and then apply replace() as needed.
Databases commonly contain addresses, and so I wanted to point out that the generalized version of the OP's problem as applied to addresses within the United States has been addressed (humor!) by the Coding Accuracy Support System (CASS). CASS is a database tool that accepts a U.S. address and completes or corrects it to meet a standard set by the U.S. Postal Service. The Wikipedia entry https://en.wikipedia.org/wiki/Postal_address_verification has the basics, and more information is available at the Post Office: https://ribbs.usps.gov/index.cfm?page=address_info_systems
How do you connect to multiple MySQL databases on a single webpage?
$dbh1 = mysql_connect($hostname, $username, $password);
$dbh2 = mysql_connect($hostname, $username, $password, true);
mysql_select_db('database1', $dbh1);
mysql_select_db('database2',$dbh2);
mysql_query('select * from tablename', $dbh1);
mysql_query('select * from tablename', $dbh2);
This is the most obvious solution that I use but just remember, if the username / password for both the database is exactly same in the same host, this solution will always be using the first connection. So don't be confused that this is not working in such case. What you need to do is, create 2 different users for the 2 databases and it will work.
How to convert XML to java.util.Map and vice versa
XStream!
Updated: I added unmarshal part as requested in comments..
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.Map;
public class Test {
public static void main(String[] args) {
Map<String,String> map = new HashMap<String,String>();
map.put("name","chris");
map.put("island","faranga");
XStream magicApi = new XStream();
magicApi.registerConverter(new MapEntryConverter());
magicApi.alias("root", Map.class);
String xml = magicApi.toXML(map);
System.out.println("Result of tweaked XStream toXml()");
System.out.println(xml);
Map<String, String> extractedMap = (Map<String, String>) magicApi.fromXML(xml);
assert extractedMap.get("name").equals("chris");
assert extractedMap.get("island").equals("faranga");
}
public static class MapEntryConverter implements Converter {
public boolean canConvert(Class clazz) {
return AbstractMap.class.isAssignableFrom(clazz);
}
public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {
AbstractMap map = (AbstractMap) value;
for (Object obj : map.entrySet()) {
Map.Entry entry = (Map.Entry) obj;
writer.startNode(entry.getKey().toString());
Object val = entry.getValue();
if ( null != val ) {
writer.setValue(val.toString());
}
writer.endNode();
}
}
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
Map<String, String> map = new HashMap<String, String>();
while(reader.hasMoreChildren()) {
reader.moveDown();
String key = reader.getNodeName(); // nodeName aka element's name
String value = reader.getValue();
map.put(key, value);
reader.moveUp();
}
return map;
}
}
}
Convert int to string?
using System.ComponentModel;
TypeConverter converter = TypeDescriptor.GetConverter(typeof(int));
string s = (string)converter.ConvertTo(i, typeof(string));
Dynamic tabs with user-click chosen components
I'm not cool enough for comments. I fixed the plunker from the accepted answer to work for rc2. Nothing fancy, links to the CDN were just broken is all.
'@angular/core': {
main: 'bundles/core.umd.js',
defaultExtension: 'js'
},
'@angular/compiler': {
main: 'bundles/compiler.umd.js',
defaultExtension: 'js'
},
'@angular/common': {
main: 'bundles/common.umd.js',
defaultExtension: 'js'
},
'@angular/platform-browser-dynamic': {
main: 'bundles/platform-browser-dynamic.umd.js',
defaultExtension: 'js'
},
'@angular/platform-browser': {
main: 'bundles/platform-browser.umd.js',
defaultExtension: 'js'
},
How to convert an Array to a Set in Java
private Map<Integer, Set<Integer>> nobreaks = new HashMap();
nobreaks.put(1, new HashSet(Arrays.asList(new int[]{2, 4, 5})));
System.out.println("expected size is 3: " +nobreaks.get(1).size());
the output is
expected size is 3: 1
change it to
nobreaks.put(1, new HashSet(Arrays.asList( 2, 4, 5 )));
the output is
expected size is 3: 3
Downloading an entire S3 bucket?
If you use Visual Studio, download "AWS Toolkit for Visual Studio".
After installed, go to Visual Studio - AWS Explorer - S3 - Your bucket - Double click
In the window you will be able to select all files. Right click and download files.
Transparent background on winforms?
The manner I have used before is to use a wild color (a color no one in their right mind would use) for the BackColor and then set the transparency key to that.
this.BackColor = Color.LimeGreen;
this.TransparencyKey = Color.LimeGreen;
How do I get a PHP class constructor to call its parent's parent's constructor?
I agree with "too much php", try this:
class Grandpa
{
public function __construct()
{
echo 'Grandpa<br/>';
}
}
class Papa extends Grandpa
{
public function __construct()
{
echo 'Papa<br/>';
parent::__construct();
}
}
class Kiddo extends Papa
{
public function __construct()
{
// THIS IS WHERE I NEED TO CALL GRANDPA'S
// CONSTRUCTOR AND NOT PAPA'S
echo 'Kiddo<br/>';
Grandpa::__construct();
}
}
$instance = new Kiddo;
I got the result as expected:
Kiddo
Grandpa
This is a feature not a bug, check this for your reference:
https://bugs.php.net/bug.php?id=42016
It is just the way it works. If it sees it is coming from the right context this call version does not enforce a static call.
Instead it will simply keep $this and be happy with it.
parent::method() works in the same way, you don't have to define the method as static but it can be called in the same context. Try this out for more interesting:
class Grandpa
{
public function __construct()
{
echo 'Grandpa<br/>';
Kiddo::hello();
}
}
class Papa extends Grandpa
{
public function __construct()
{
echo 'Papa<br/>';
parent::__construct();
}
}
class Kiddo extends Papa
{
public function __construct()
{
// THIS IS WHERE I NEED TO CALL GRANDPA'S
// CONSTRUCTOR AND NOT PAPA'S
echo 'Kiddo<br/>';
Grandpa::__construct();
}
public function hello()
{
echo 'Hello<br/>';
}
}
$instance = new Kiddo;
It also works as expected:
Kiddo
Grandpa
Hello
But if you try to initialize a new Papa, you will get an E_STRICT error:
$papa = new Papa;
Strict standards: Non-static method Kiddo::hello() should not be called statically, assuming $this from incompatible context
You can use instanceof to determine if you can call a Children::method() in a parent method:
if ($this instanceof Kiddo) Kiddo::hello();
Prevent typing non-numeric in input type number
Based on Nrzonline's answer: I fixed the problem of the multiple "." at the end of the input by adding a
let lastCharacterEntered
outside of the input and then onKeyPress
e => {
var allowedChars = "0123456789.";
function contains(stringValue, charValue) {
return stringValue.indexOf(charValue) > -1;
}
var invalidKey =
(e.key.length === 1 && !contains(allowedChars, e.key)) ||
(e.key === "." && contains(e.target.value, "."));
console.log(e.target.value);
invalidKey && e.preventDefault();
if (!invalidKey) {
if (lastCharacterEntered === "." && e.key === ".") {
e.preventDefault();
} else {
lastCharacterEntered = e.key;
}
}
}
Python Requests - No connection adapters
One more reason, maybe your url include some hiden characters, such as '\n'.
If you define your url like below, this exception will raise:
url = '''
http://google.com
'''
because there are '\n' hide in the string. The url in fact become:
\nhttp://google.com\n
Find the unique values in a column and then sort them
You can also use the drop_duplicates() instead of unique()
df = pd.DataFrame({'A':[1,1,3,2,6,2,8]})
a = df['A'].drop_duplicates()
a.sort()
print a
HTTP status code 0 - Error Domain=NSURLErrorDomain?
On gate way timeout, status will be zero on your error call back.
.error( function( data,status,headers,config){
console.log(status)
}
Lining up labels with radio buttons in bootstrap
Since Bootstrap 3 you have to use checkbox-inline and radio-inline classes on the label.
This takes care of vertical alignment.
<label class="checkbox-inline">
<input type="checkbox" id="inlineCheckbox1" value="option1"> 1
</label>
<label class="radio-inline">
<input type="radio" name="inlineRadioOptions" id="inlineRadio1" value="option1"> 1
</label>
Send and receive messages through NSNotificationCenter in Objective-C?
@implementation TestClass
- (void) dealloc
{
// If you don't remove yourself as an observer, the Notification Center
// will continue to try and send notification objects to the deallocated
// object.
[[NSNotificationCenter defaultCenter] removeObserver:self];
[super dealloc];
}
- (id) init
{
self = [super init];
if (!self) return nil;
// Add this instance of TestClass as an observer of the TestNotification.
// We tell the notification center to inform us of "TestNotification"
// notifications using the receiveTestNotification: selector. By
// specifying object:nil, we tell the notification center that we are not
// interested in who posted the notification. If you provided an actual
// object rather than nil, the notification center will only notify you
// when the notification was posted by that particular object.
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(receiveTestNotification:)
name:@"TestNotification"
object:nil];
return self;
}
- (void) receiveTestNotification:(NSNotification *) notification
{
// [notification name] should always be @"TestNotification"
// unless you use this method for observation of other notifications
// as well.
if ([[notification name] isEqualToString:@"TestNotification"])
NSLog (@"Successfully received the test notification!");
}
@end
... somewhere else in another class ...
- (void) someMethod
{
// All instances of TestClass will be notified
[[NSNotificationCenter defaultCenter]
postNotificationName:@"TestNotification"
object:self];
}
Performing a query on a result from another query?
I don't know if you even need to wrap it. Won't this work?
SELECT COUNT(*), SUM(DATEDIFF(now(),availables.updated_at))
FROM availables
INNER JOIN rooms ON availables.room_id=rooms.id
WHERE availables.bookdate BETWEEN '2009-06-25'
AND date_add('2009-06-25', INTERVAL 4 DAY)
AND rooms.hostel_id = 5094
GROUP BY availables.bookdate);
If your goal is to return both result sets then you'll need to store it some place temporarily.
How to interpret "loss" and "accuracy" for a machine learning model
They are two different metrics to evaluate your model's performance usually being used in different phases.
Loss is often used in the training process to find the "best" parameter values for your model (e.g. weights in neural network). It is what you try to optimize in the training by updating weights.
Accuracy is more from an applied perspective. Once you find the optimized parameters above, you use this metrics to evaluate how accurate your model's prediction is compared to the true data.
Let us use a toy classification example. You want to predict gender from one's weight and height. You have 3 data, they are as follows:(0 stands for male, 1 stands for female)
y1 = 0, x1_w = 50kg, x2_h = 160cm;
y2 = 0, x2_w = 60kg, x2_h = 170cm;
y3 = 1, x3_w = 55kg, x3_h = 175cm;
You use a simple logistic regression model that is y = 1/(1+exp-(b1*x_w+b2*x_h))
How do you find b1 and b2? you define a loss first and use optimization method to minimize the loss in an iterative way by updating b1 and b2.
In our example, a typical loss for this binary classification problem can be: (a minus sign should be added in front of the summation sign)
We don't know what b1 and b2 should be. Let us make a random guess say b1 = 0.1 and b2 = -0.03. Then what is our loss now?
so the loss is
Then you learning algorithm (e.g. gradient descent) will find a way to update b1 and b2 to decrease the loss.
What if b1=0.1 and b2=-0.03 is the final b1 and b2 (output from gradient descent), what is the accuracy now?
Let's assume if y_hat >= 0.5, we decide our prediction is female(1). otherwise it would be 0. Therefore, our algorithm predict y1 = 1, y2 = 1 and y3 = 1. What is our accuracy? We make wrong prediction on y1 and y2 and make correct one on y3. So now our accuracy is 1/3 = 33.33%
PS: In Amir's answer, back-propagation is said to be an optimization method in NN. I think it would be treated as a way to find gradient for weights in NN. Common optimization method in NN are GradientDescent and Adam.
Getting specified Node values from XML document
Just like you do for getting something from the CNode you also need to do for the ANode
XmlNodeList xnList = xml.SelectNodes("/Element[@*]");
foreach (XmlNode xn in xnList)
{
XmlNode anode = xn.SelectSingleNode("ANode");
if (anode!= null)
{
string id = anode["ID"].InnerText;
string date = anode["Date"].InnerText;
XmlNodeList CNodes = xn.SelectNodes("ANode/BNode/CNode");
foreach (XmlNode node in CNodes)
{
XmlNode example = node.SelectSingleNode("Example");
if (example != null)
{
string na = example["Name"].InnerText;
string no = example["NO"].InnerText;
}
}
}
}
In PHP, how do you change the key of an array element?
This function will rename an array key, keeping its position, by combining with index searching.
function renameArrKey($arr, $oldKey, $newKey){
if(!isset($arr[$oldKey])) return $arr; // Failsafe
$keys = array_keys($arr);
$keys[array_search($oldKey, $keys)] = $newKey;
$newArr = array_combine($keys, $arr);
return $newArr;
}
Usage:
$arr = renameArrKey($arr, 'old_key', 'new_key');
CSS Vertical align does not work with float
Edited:
The vertical-align CSS property specifies the vertical alignment of an inline, inline-block or table-cell element.
Read this article for Understanding vertical-align
AngularJS : Factory and Service?
Service vs Factory
The difference between factory and service is just like the difference between a function and an object
Factory Provider
Gives us the function's return value ie. You just create an object, add properties to it, then return that same object.When you pass this service into your controller, those properties on the object will now be available in that controller through your factory. (Hypothetical Scenario)
Singleton and will only be created once
Reusable components
Factory are a great way for communicating between controllers like sharing data.
Can use other dependencies
Usually used when the service instance requires complex creation logic
Cannot be injected in
.config()function.Used for non configurable services
If you're using an object, you could use the factory provider.
Syntax:
module.factory('factoryName', function);
Service Provider
Gives us the instance of a function (object)- You just instantiated with the ‘new’ keyword and you’ll add properties to ‘this’ and the service will return ‘this’.When you pass the service into your controller, those properties on ‘this’ will now be available on that controller through your service. (Hypothetical Scenario)
Singleton and will only be created once
Reusable components
Services are used for communication between controllers to share data
You can add properties and functions to a service object by using the
thiskeywordDependencies are injected as constructor arguments
Used for simple creation logic
Cannot be injected in
.config()function.If you're using a class you could use the service provider
Syntax:
module.service(‘serviceName’, function);
In below example I have define MyService and MyFactory. Note how in .service I have created the service methods using this.methodname. In .factory I have created a factory object and assigned the methods to it.
AngularJS .service
module.service('MyService', function() {
this.method1 = function() {
//..method1 logic
}
this.method2 = function() {
//..method2 logic
}
});
AngularJS .factory
module.factory('MyFactory', function() {
var factory = {};
factory.method1 = function() {
//..method1 logic
}
factory.method2 = function() {
//..method2 logic
}
return factory;
});
Also Take a look at this beautiful stuffs
Confused about service vs factory
How to count number of records per day?
select DateAdded, count(DateAdded) as num_records
from your_table
WHERE DateAdded >=dateadd(day,datediff(day,0,GetDate())- 7,0)
group by DateAdded
order by DateAdded
Laravel whereIn OR whereIn
You have a orWhereIn function in Laravel. It takes the same parameters as the whereIn function.
It's not in the documentation but you can find it in the laravel API. http://laravel.com/api/4.1/
That should give you this:
$query-> orWhereIn('products.value', $f);
It is more efficient to use if-return-return or if-else-return?
I personally avoid else blocks when possible. See the Anti-if Campaign
Also, they don't charge 'extra' for the line, you know :p
"Simple is better than complex" & "Readability is king"
delta = 1 if (A > B) else -1
return A + delta
Remove last character from string. Swift language
Swift 4
var welcome = "Hello World!"
welcome = String(welcome[..<welcome.index(before:welcome.endIndex)])
or
welcome.remove(at: welcome.index(before: welcome.endIndex))
or
welcome = String(welcome.dropLast())
Reverse a string in Python
original = "string"
rev_index = original[::-1]
rev_func = list(reversed(list(original))) #nsfw
print(original)
print(rev_index)
print(''.join(rev_func))
Instagram: Share photo from webpage
As of November 17, 2015. This rule has officially changed. Instagram has deprecated the rule against using their API to upload images.
Good luck.
How to remove specific substrings from a set of strings in Python?
>>> x = 'Pear.good'
>>> y = x.replace('.good','')
>>> y
'Pear'
>>> x
'Pear.good'
.replace doesn't change the string, it returns a copy of the string with the replacement. You can't change the string directly because strings are immutable.
You need to take the return values from x.replace and put them in a new set.
How to Find the Default Charset/Encoding in Java?
I have set the vm argument in WAS server as -Dfile.encoding=UTF-8 to change the servers' default character set.
Implementing SearchView in action bar
For Searchview use these code
For XML
<android.support.v7.widget.SearchView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/searchView"> </android.support.v7.widget.SearchView>In your Fragment or Activity
package com.example.user.salaryin; import android.app.ProgressDialog; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.view.MenuItemCompat; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.SearchView; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.Toast; import com.example.user.salaryin.Adapter.BusinessModuleAdapter; import com.example.user.salaryin.Network.ApiClient; import com.example.user.salaryin.POJO.ProductDetailPojo; import com.example.user.salaryin.Service.ServiceAPI; import java.util.ArrayList; import java.util.List; import retrofit2.Call; import retrofit2.Callback; import retrofit2.Response; public class OneFragment extends Fragment implements SearchView.OnQueryTextListener { RecyclerView recyclerView; RecyclerView.LayoutManager layoutManager; ArrayList<ProductDetailPojo> arrayList; BusinessModuleAdapter adapter; private ProgressDialog pDialog; GridLayoutManager gridLayoutManager; SearchView searchView; public OneFragment() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.one_fragment,container,false); pDialog = new ProgressDialog(getActivity()); pDialog.setMessage("Please wait..."); searchView=(SearchView)rootView.findViewById(R.id.searchView); searchView.setQueryHint("Search BY Brand"); searchView.setOnQueryTextListener(this); recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView); layoutManager = new LinearLayoutManager(this.getActivity()); recyclerView.setLayoutManager(layoutManager); gridLayoutManager = new GridLayoutManager(this.getActivity().getApplicationContext(), 2); recyclerView.setLayoutManager(gridLayoutManager); recyclerView.setHasFixedSize(true); getImageData(); // Inflate the layout for this fragment //return inflater.inflate(R.layout.one_fragment, container, false); return rootView; } private void getImageData() { pDialog.show(); ServiceAPI service = ApiClient.getRetrofit().create(ServiceAPI.class); Call<List<ProductDetailPojo>> call = service.getBusinessImage(); call.enqueue(new Callback<List<ProductDetailPojo>>() { @Override public void onResponse(Call<List<ProductDetailPojo>> call, Response<List<ProductDetailPojo>> response) { if (response.isSuccessful()) { arrayList = (ArrayList<ProductDetailPojo>) response.body(); adapter = new BusinessModuleAdapter(arrayList, getActivity()); recyclerView.setAdapter(adapter); pDialog.dismiss(); } else if (response.code() == 401) { pDialog.dismiss(); Toast.makeText(getActivity(), "Data is not found", Toast.LENGTH_SHORT).show(); } } @Override public void onFailure(Call<List<ProductDetailPojo>> call, Throwable t) { Toast.makeText(getActivity(), t.getMessage(), Toast.LENGTH_SHORT).show(); pDialog.dismiss(); } }); } /* @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { getActivity().getMenuInflater().inflate(R.menu.menu_search, menu); MenuItem menuItem = menu.findItem(R.id.action_search); SearchView searchView = (SearchView) MenuItemCompat.getActionView(menuItem); searchView.setQueryHint("Search Product"); searchView.setOnQueryTextListener(this); }*/ @Override public boolean onQueryTextSubmit(String query) { return false; } @Override public boolean onQueryTextChange(String newText) { newText = newText.toLowerCase(); ArrayList<ProductDetailPojo> newList = new ArrayList<>(); for (ProductDetailPojo productDetailPojo : arrayList) { String name = productDetailPojo.getDetails().toLowerCase(); if (name.contains(newText) ) newList.add(productDetailPojo); } adapter.setFilter(newList); return true; } }In adapter class
public void setFilter(List<ProductDetailPojo> newList){ arrayList=new ArrayList<>(); arrayList.addAll(newList); notifyDataSetChanged(); }
How to create jar file with package structure?
Step 1: Go to directory where the classes are kept using command prompt (or Linux shell prompt)
Like for Project.
C:/workspace/MyProj/bin/classess/com/test/*.class
Go directory bin using command:
cd C:/workspace/MyProj/bin
Step 2: Use below command to generate jar file.
jar cvf helloworld.jar com\test\hello\Hello.class com\test\orld\HelloWorld.class
Using the above command the classes will be placed in a jar in a directory structure.
Meaning of tilde in Linux bash (not home directory)
Those are users. Check your /etc/passwd.
cd ~username takes you to that user's home directory.
JavaScript string and number conversion
Step (1) Concatenate "1", "2", "3" into "123"
"1" + "2" + "3"
or
["1", "2", "3"].join("")
The join method concatenates the items of an array into a string, putting the specified delimiter between items. In this case, the "delimiter" is an empty string ("").
Step (2) Convert "123" into 123
parseInt("123")
Prior to ECMAScript 5, it was necessary to pass the radix for base 10: parseInt("123", 10)
Step (3) Add 123 + 100 = 223
123 + 100
Step (4) Covert 223 into "223"
(223).toString()
Put It All Togther
(parseInt("1" + "2" + "3") + 100).toString()
or
(parseInt(["1", "2", "3"].join("")) + 100).toString()
Find an object in array?
For example, if we had an array of numbers:
let numbers = [2, 4, 6, 8, 9, 10]
We could find the first odd number like this:
let firstOdd = numbers.index { $0 % 2 == 1 }
That will send back 4 as an optional integer, because the first odd number (9) is at index four.
How to count the number of letters in a string without the spaces?
I found this is working perfectly
str = "count a character occurance"
str = str.replace(' ', '')
print (str)
print (len(str))
Change GitHub Account username
Yes, this is an old question. But it's misleading, as this was the first result in my search, and both the answers aren't correct anymore.
You can change your Github account name at any time.
To do this, click your profile picture > Settings > Account Settings > Change Username.
Links to your repositories will redirect to the new URLs, but they should be updated on other sites because someone who chooses your abandoned username can override the links. Links to your profile page will be 404'd.
For more information, see the official help page.
And furthermore, if you want to change your username to something else, but that specific username is being taken up by someone else who has been completely inactive for the entire time their account has existed, you can report their account for name squatting.
Passing variable number of arguments around
In magnificent C++0x you could use variadic templates:
template <typename ... Ts>
void format_string(char *fmt, Ts ... ts) {}
template <typename ... Ts>
void debug_print(int dbg_lvl, char *fmt, Ts ... ts)
{
format_string(fmt, ts...);
}
convert a char* to std::string
const char* charPointer = "Hello, World!\n";
std::string strFromChar;
strFromChar.append(charPointer);
std::cout<<strFromChar<<std::endl;
How do you convert a time.struct_time object into a datetime object?
Like this:
>>> structTime = time.localtime()
>>> datetime.datetime(*structTime[:6])
datetime.datetime(2009, 11, 8, 20, 32, 35)
How to use Switch in SQL Server
Actually i am getting return value from a another sp into @temp and then it @temp =1 then i want to inc the count of @SelectoneCount by 1 and so on. Please let me know what is the correct syntax.
What's wrong with:
IF @Temp = 1 --Or @Temp = 2 also?
BEGIN
SET @SelectoneCount = @SelectoneCount + 1
END
(Although this does reek of being procedural code - not usually the best way to use SQL)
matplotlib: how to draw a rectangle on image
From my understanding matplotlib is a plotting library.
If you want to change the image data (e.g. draw a rectangle on an image), you could use PIL's ImageDraw, OpenCV, or something similar.
Here is PIL's ImageDraw method to draw a rectangle.
Here is one of OpenCV's methods for drawing a rectangle.
Your question asked about Matplotlib, but probably should have just asked about drawing a rectangle on an image.
Here is another question which addresses what I think you wanted to know: Draw a rectangle and a text in it using PIL
ServletException, HttpServletResponse and HttpServletRequest cannot be resolved to a type
Two possible issues could be
- you either forgot to include Servlet jar in your classpath
- you forgot to import it in your Servlet class
To include Servlet jar in your class path in eclipse, Download the latest Servlet Jar and configure using buildpath option. look at this Link for more info.
If you have included the jar make sure that your import is declared.
import javax.servlet.http.HttpServletResponse
Accessing SQL Database in Excel-VBA
Add set nocount on to the beginning of the stored proc (if you're on SQL Server). I just solved this problem in my own work and it was caused by intermediate results, such as "1203 Rows Affected", being loaded into the Recordset I was trying to use.
NoClassDefFoundError in Java: com/google/common/base/Function
I met the same problem and fail even after installing the 'selenium-server-standalone-version.jar', I think you need to install the guava and guava-gwt jar (https://code.google.com/p/guava-libraries/) as well. I added all of these jar, and finally it worked in my PC. Hope it works for others meeting this issue.
Passing arguments to JavaScript function from code-behind
Response.Write("<scrip" + "t>test(" + x + "," + y + ");</script>");
breaking up the script keyword because VStudio / asp.net compiler doesn't like it
'import' and 'export' may only appear at the top level
My error is caused by a System.import('xxx.js') statment. After replacing it with import xxx from 'xxx.js', the error solved.
I think it is because require('xxx.scss') also caused a dynamic import.
For the case in the question description, in my opinion, dynamic imports is not necessary, so the problem should be solved by just replacing all requires with import ... from ....
For some case which dynamic imports are necessary, you may need @babel/plugin-syntax-dynamic-import as other answers in this question.
Search and replace a line in a file in Python
The shortest way would probably be to use the fileinput module. For example, the following adds line numbers to a file, in-place:
import fileinput
for line in fileinput.input("test.txt", inplace=True):
print('{} {}'.format(fileinput.filelineno(), line), end='') # for Python 3
# print "%d: %s" % (fileinput.filelineno(), line), # for Python 2
What happens here is:
- The original file is moved to a backup file
- The standard output is redirected to the original file within the loop
- Thus any
printstatements write back into the original file
fileinput has more bells and whistles. For example, it can be used to automatically operate on all files in sys.args[1:], without your having to iterate over them explicitly. Starting with Python 3.2 it also provides a convenient context manager for use in a with statement.
While fileinput is great for throwaway scripts, I would be wary of using it in real code because admittedly it's not very readable or familiar. In real (production) code it's worthwhile to spend just a few more lines of code to make the process explicit and thus make the code readable.
There are two options:
- The file is not overly large, and you can just read it wholly to memory. Then close the file, reopen it in writing mode and write the modified contents back.
- The file is too large to be stored in memory; you can move it over to a temporary file and open that, reading it line by line, writing back into the original file. Note that this requires twice the storage.
Git merge reports "Already up-to-date" though there is a difference
I had the same problem. I had changes in the remote and it was still showing "Already up to date". Recloning the repository fixed the problem for me.
Why use @PostConstruct?
The main problem is that:
in a constructor, the injection of the dependencies has not yet occurred*
*obviously excluding Constructor Injection
Real-world example:
public class Foo {
@Inject
Logger LOG;
@PostConstruct
public void fooInit(){
LOG.info("This will be printed; LOG has already been injected");
}
public Foo() {
LOG.info("This will NOT be printed, LOG is still null");
// NullPointerException will be thrown here
}
}
IMPORTANT:
@PostConstruct and @PreDestroy have been completely removed in Java 11.
To keep using them, you'll need to add the javax.annotation-api JAR to your dependencies.
Maven
<!-- https://mvnrepository.com/artifact/javax.annotation/javax.annotation-api -->
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.3.2</version>
</dependency>
Gradle
// https://mvnrepository.com/artifact/javax.annotation/javax.annotation-api
compile group: 'javax.annotation', name: 'javax.annotation-api', version: '1.3.2'
Why does typeof array with objects return "object" and not "array"?
Quoting the spec
15.4 Array Objects
Array objects give special treatment to a certain class of property names. A property name P (in the form of a String value) is an array index if and only if ToString(ToUint32(P)) is equal to P and ToUint32(P) is not equal to 2^32-1. A property whose property name is an array index is also called an element. Every Array object has a length property whose value is always a nonnegative integer less than 2^32. The value of the length property is numerically greater than the name of every property whose name is an array index; whenever a property of an Array object is created or changed, other properties are adjusted as necessary to maintain this invariant. Specifically, whenever a property is added whose name is an array index, the length property is changed, if necessary, to be one more than the numeric value of that array index; and whenever the length property is changed, every property whose name is an array index whose value is not smaller than the new length is automatically deleted. This constraint applies only to own properties of an Array object and is unaffected by length or array index properties that may be inherited from its prototypes.
And here's a table for typeof
To add some background, there are two data types in JavaScript:
- Primitive Data types - This includes null, undefined, string, boolean, number and object.
- Derived data types/Special Objects - These include functions, arrays and regular expressions. And yes, these are all derived from "Object" in JavaScript.
An object in JavaScript is similar in structure to the associative array/dictionary seen in most object oriented languages - i.e., it has a set of key-value pairs.
An array can be considered to be an object with the following properties/keys:
- Length - This can be 0 or above (non-negative).
- The array indices. By this, I mean "0", "1", "2", etc are all properties of array object.
Hope this helped shed more light on why typeof Array returns an object. Cheers!
Could not find method compile() for arguments Gradle
compile is a configuration that is usually introduced by a plugin (most likely the java plugin) Have a look at the gradle userguide for details about configurations. For now adding the java plugin on top of your build script should do the trick:
apply plugin:'java'
go to link on button click - jquery
Why not just change the second line to
document.location.href="www.example.com/index.php?id=" + $(this).attr('id');
Merge two rows in SQL
if one row has value in field1 column and other rows have null value then this Query might work.
SELECT
FK,
MAX(Field1) as Field1,
MAX(Field2) as Field2
FROM
(
select FK,ISNULL(Field1,'') as Field1,ISNULL(Field2,'') as Field2 from table1
)
tbl
GROUP BY FK
Cannot stop or restart a docker container
in my case, i couldn't delete container created with nomad jobs,
there's no output for the docker logs <ContainerID> and, in general, it looks like frozen.
until now the solution is: sudo service docker restart, may someone suggest better one?
Creating an Instance of a Class with a variable in Python
I think you can use eval. Something like this
def toclass(strcls):
return eval(strcls)()
How to write a stored procedure using phpmyadmin and how to use it through php?
All the answers above are making certain assumptions. There are basic problems in 1and1 and certain other hosting providers are using phpMyAdmin versions which are very old and have an issue that defined delimiter is ; and there is no way to change it from phpMyAdmin. Following are the ways
- Create a new PHPMyAdmin on the hosting provider. Attached link gives you idea http://internetbandaid.com/2009/04/05/install-phpmyadmin-on-1and1/
- Go thru the complicated route of be able to access the your hosting providers mySQL from your dekstop. It is complicated but the best if you are a serious developer. here is a link to do it http://franklinstrube.com/blog/remote-mysql-administration-for-1and1/
Hope this helps
How to set default Checked in checkbox ReactJS?
It`s working
<input type="checkbox" value={props.key} defaultChecked={props.checked} ref={props.key} onChange={this.checkboxHandler} />
And function init it
{this.viewCheckbox({ key: 'yourKey', text: 'yourText', checked: this.state.yourKey })}
How to get relative path of a file in visual studio?
I also met the same problem and I was able to get it through. So let me explain the steps I applied. I shall explain it according to your scenario.
According to my method we need to use 'Path' class and 'Assembly' class in order to get the relative path.
So first Import System.IO and System.Reflection in using statements.
Then type the below given code line.
var outPutDirectory = Path.GetDirectoryName(Assembly.GetExecutingAssembly(). CodeBase);
Actually above given line stores the path of the output directory of your project.(Here 'output' directory refers to the Debug folder of your project).
Now copy your FolderIcon directory in to the Debug folder. Then type the below given Line.
var iconPath = Path.Combine(outPutDirectory, "FolderIcon\\Folder.ico");
Now this 'iconPath ' variable contains the entire path of your Folder.ico. All you have to do is store it in a string variable. Use the line of code below for that.
string icon_path = new Uri(iconPath ).LocalPath;
Now you can use this icon_path string variable as your relative path to the icon.
Thanks.
Conditionally formatting if multiple cells are blank (no numerics throughout spreadsheet )
The steps you took are not appropriate because the cell you want formatted is not the trigger cell (presumably won't normally be blank). In your case you want formatting to apply to one set of cells according to the status of various other cells. I suggest with data layout as shown in the image (and with thanks to @xQbert for a start on a suitable formula) you select ColumnA and:
HOME > Styles - Conditional Formatting, New Rule..., Use a formula to determine which cells to format and Format values where this formula is true::
=AND(LEN(E1)*LEN(F1)*LEN(G1)*LEN(H1)=0,NOT(ISBLANK(A1)))
Format..., select formatting, OK, OK.
where I have filled yellow the cells that are triggering the red fill result.
Error: getaddrinfo ENOTFOUND in nodejs for get call
var http = require('http');
var options = {
host: 'localhost',
port: 80,
path: '/broadcast'
};
var requestLoop = setInterval(function(){
http.get (options, function (resp) {
resp.on('data', function (d) {
console.log ('data!', d.toString());
});
resp.on('end', function (d) {
console.log ('Finished !');
});
}).on('error', function (e) {
console.log ('error:', e);
});
}, 10000);
var dns = require('dns'), cache = {};
dns._lookup = dns.lookup;
dns.lookup = function(domain, family, done) {
if (!done) {
done = family;
family = null;
}
var key = domain+family;
if (key in cache) {
var ip = cache[key],
ipv = ip.indexOf('.') !== -1 ? 4 : 6;
return process.nextTick(function() {
done(null, ip, ipv);
});
}
dns._lookup(domain, family, function(err, ip, ipv) {
if (err) return done(err);
cache[key] = ip;
done(null, ip, ipv);
});
};
// Works fine (100%)
The resource could not be loaded because the App Transport Security policy requires the use of a secure connection
If you are using Xcode 8.0 and swift 3.0 or 2.2
Display number always with 2 decimal places in <input>
{{value | number : fractionSize}}
like {{12.52311 | number : 2}}
so this will print 12.52
tsc is not recognized as internal or external command
There might be a reason that Typescript is not installed globally, so install it
npm install -g typescript // installs typescript globally
If you want to convert .ts files into .js, do this as per your need
tsc file.ts // file.ts will be converted to file.js file
tsc // all .ts files will be converted to .js files in the directory
tsc --watch // converts all .ts files to .js, and watch changes in .ts files