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Variable name as a string in Javascript
...
var x = 2;
for(o in window){
if(window[o] === x){
alert(o);
}
}
However, I think you should do like "karim79"
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foll...
Detecting arrow key presses in JavaScript
...down = function(e) {
switch (e.keyCode) {
case 37:
alert('left');
break;
case 38:
alert('up');
break;
case 39:
alert('right');
break;
case 40:
alert('down');
break;
...
How can I upload files asynchronously?
...ick:
$(':button').on('click', function () {
$.ajax({
// Your server script to process the upload
url: 'upload.php',
type: 'POST',
// Form data
data: new FormData($('form')[0]),
// Tell jQuery not to process data or worry about content-type
// You *must* include these...
JavaScript: filter() for Objects
...type
Object.prototype.extended = "I'm everywhere!";
// See the result
alert( {}.extended ); // "I'm everywhere!"
alert( [].extended ); // "I'm everywhere!"
alert( new Date().extended ); // "I'm everywhere!"
alert( 3..extended ); // "I'm everywhere!"
alert( true.exten...
Default argument values in JavaScript functions [duplicate]
...peof(a)==='undefined') a = 10;
if (typeof(b)==='undefined') b = 20;
alert("A: "+a+"\nB: "+b);
}
//testing
func();
func(80);
func(100,200);
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...
(Deep) copying an array using jQuery [duplicate]
...r is a copy, not a reference... so if you did this next...
bar.push('f');
alert('foo:' + foo.join(', '));
alert('bar:' + bar.join(', '));
you would now get:
foo:a, b, c, d, e
bar:a, b, c, d, e, f
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jquery find closest previous sibling with class
...
You can follow this code:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function () {
$(".add").on("click", function () {
var v = $(this).close...
jquery - return value using ajax result on success
... return data;
},
error: function() {
alert('Error occured');
}
});
}
Another possibility (which is effectively the same thing) is to call a function inside your success: callback that passes the data when it is available.
function isSession(select...
Parse JSON String into a Particular Object Prototype in JavaScript
... for (var prop in obj) this[prop] = obj[prop];
}
var fooObj = new Foo();
alert(fooObj.test() ); //Prints 6
// INITIALISE A NEW FOO AND PASS THE PARSED JSON OBJECT TO IT
var fooJSON = new Foo(JSON.parse('{"a":4,"b":3}'));
alert(fooJSON.test() ); //Prints 12
...
What is the JavaScript convention for no operation?
...on is:
none of your suggestions, instead do:
var a = 2;
if (a === 1)
alert(1)
// else do nothing!
then the code is easily understandable, readable and as much efficient as it can get.
Why make it more difficult, when it can be simple?
edit:
So then, does a "no-operation" command basica...