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App Inventor 2 CustomWebView 拓展：高级版Web浏览器，完美浏览现代Web前...
... on-screen zoom controls
EnableJS
Returns whether webview supports JavaScript execution
FileAccess
Returns whether webview can access local files
FollowLinks
Sets whether to follow links or not
FontSize
Returns the font size of text
InitialScale
Sets the initial scale for active ...
Regex using javascript to return just numbers
...var numberPattern = /\d+/g;
value = value.match( numberPattern ).join([]);
alert(value);
//Show: 675805714
Now you get the digits joined
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follo...
How can I have a newline in a string in sh?
...ability.
You can also try and insert the newline directly into your shell script (if a script is what you're writing) so it looks like...
#!/bin/sh
echo "Hello
World"
#EOF
or equivalently
#!/bin/sh
string="Hello
World"
echo "$string" # note double quotes!
...
Calling a function on bootstrap modal open
...how event based on what you need:
$( "#code" ).on('shown', function(){
alert("I want this to appear after the modal has opened!");
});
Demo: Plunker
Update for Bootstrap 3.0
For Bootstrap 3.0 you can still use the shown event but you would use it like this:
$('#code').on('shown.bs.modal', funct...
How does “this” keyword work within a function?
...at's attached to an object
var foo = {};
foo.someMethod = function(){
alert(this);
}
When invoked as a method, this will be bound to the object the function/method is a part of. In this example, this will be bound to foo.
As A Function
If you have a stand alone function, the this variable ...
JavaScript OR (||) variable assignment explanation
... " messages.";
var noNewMessagesText = "Sorry, you have no new messages.";
alert((messages && newMessagesText) || noNewMessagesText);
Inside the alert, we check if messages is falsy, and if yes, then evaluate and return noNewMessagesText, otherwise evaluate and return newMessagesText. Sinc...
What does the “|” (single pipe) do in JavaScript?
... 1 1 1 0 = 14 (8 + 4 + 2)
Bitwise ORing 6 and 10 will give you 14:
alert(6 | 10); // should show 14
Terribly confusing!
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using jquery $.ajax to call a PHP function
This may be a simple answer, but I'm using jQuery's $.ajax to call a PHP script. What I want to do is basically put that PHP script inside a function and call the PHP function from javascript.
...
javascript check for not null
...
this will do the trick for you
if (!!val) {
alert("this is not null")
} else {
alert("this is null")
}
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Rails 4: how to use $(document).ready() with turbo-links
...
Here's what I do...
CoffeeScript:
ready = ->
...your coffeescript goes here...
$(document).ready(ready)
$(document).on('page:load', ready)
last line listens for page load which is what turbo links will trigger.
Edit...adding Javascript vers...