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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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Rails 4: how to use $(document).ready() with turbo-links
...
Here's what I do...
CoffeeScript:
ready = ->
...your coffeescript goes here...
$(document).ready(ready)
$(document).on('page:load', ready)
last line listens for page load which is what turbo links will trigger.
Edit...adding Javascript vers...
Detect if a page has a vertical scrollbar?
...ow height :)
if ($("body").height() > $(window).height()) {
alert("Vertical Scrollbar! D:");
}
// Check if body width is higher than window width :)
if ($("body").width() > $(window).width()) {
alert("Horizontal Scrollbar! D:<");
}
});
...
How do I create an abstract base class in JavaScript?
...t=function(name){
this.name=name;
}
Animal.prototype.say=function(){
alert(this.name + " who is a " + this.type + " says " + this.whattosay);
}
Animal.prototype.type="unknown";
function Cat(name) {
this.init(name);
//Make a cat somewhat unique
var s="";
for (var i=Math.ceil(M...
What is the opposite of evt.preventDefault();
...e) {
e.preventDefault();
var $this = $(this);
$.ajax('/path/to/script.php',
{
type: "POST",
data: { value: $("#input_control").val() }
}).done(function(response) {
$this.unbind('submit').submit();
});
});
...
Add new value to an existing array in JavaScript [duplicate]
...ay
// ---
arr = []; // empty array
// ---
arr = new Array(3);
alert(arr.length); // 3
alert(arr[0]); // undefined
// ---
arr = [3];
alert(arr.length); // 1
alert(arr[0]); // 3
Pushing to the array:
arr = [3]; // arr == [3]
arr[1] = 4; // arr == [3, 4]
arr[2] = 5; // arr...
How to get the selected radio button’s value?
...ios[i].checked) {
// do whatever you want with the checked radio
alert(radios[i].value);
// only one radio can be logically checked, don't check the rest
break;
}
}
<label for="gender">Gender: </label>
<input type="radio" name="genderS" value="1" checked="c...
Hidden Features of JavaScript? [closed]
...t I'll take just one for you, always use === and !== instead of == and !=
alert('' == '0'); //false
alert(0 == ''); // true
alert(0 =='0'); // true
== is not transitive. If you use === it would give false for
all of these statements as expected.
...
jQuery callback for multiple ajax calls
...estsCompleted({
numRequest: 3,
singleCallback: function(){
alert( "I'm the callback");
}
});
//usage in request
$.ajax({
url: '/echo/html/',
success: function(data) {
requestCallback.requestComplete(true);
}
});
$.ajax({
url: '/echo/html/',
success: f...
HTML/Javascript change div content
...
Warning! the usage of innerHTML can easily lead to XSS vulnerabilities when the value comes from an untrusted input. The use of innerText is always recommended for security reasons and currently it is supported by all browsers (caniuse.com/#feat=innertext)
...