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Detecting an undefined object property
...ty is the special value undefined, is:
if(o.myProperty === undefined) {
alert("myProperty value is the special value `undefined`");
}
To check if an object does not actually have such a property, and will therefore return undefined by default when you try and access it:
if(!o.hasOwnProperty('m...
Detect all Firefox versions in JS
How to detect Firefox in JavaScript?
I want to detect all versions of Firefox.
7 Answers
...
Create Directory When Writing To File In Node.js
I've been tinkering with Node.js and found a little problem. I've got a script which resides in a directory called data . I want the script to write some data to a file in a subdirectory within the data subdirectory. However I am getting the following error:
...
Compiling dynamic HTML strings from database
...l
<!DOCTYPE html>
<html ng-app="app">
<head>
<script data-require="angular.js@1.0.7" data-semver="1.0.7" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js"></script>
<script src="script.js"></script>
</head>
<bod...
Call js-function using JQuery timer
...this:
window.setInterval(yourfunction, 10000);
function yourfunction() { alert('test'); }
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How can I capture the right-click event in JavaScript? [duplicate]
... oncontextmenu event.
Here's an example:
<div oncontextmenu="javascript:alert('success!');return false;">
Lorem Ipsum
</div>
And using event listeners (credit to rampion from a comment in 2011):
el.addEventListener('contextmenu', function(ev) {
ev.preventDefault();
alert('su...
jquery loop on Json data using $.each
...d": 10059, "PageName": "jjjjjjj"}
];
$.each(data, function(i, item) {
alert(data[i].PageName);
});
$.each(data, function(i, item) {
alert(item.PageName);
});
these two options work well, unless you have something like:
var data.result = [
{"Id": 10004, "PageName": "club"},
{"Id": 10...
Which equals operator (== vs ===) should be used in JavaScript comparisons?
I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype.value.length == 0 inside of an if statement.
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Create, read, and erase cookies with jQuery [duplicate]
...
Use JavaScript Cookie plugin
Set a cookie
Cookies.set("example", "foo"); // Sample 1
Cookies.set("example", "foo", { expires: 7 }); // Sample 2
Cookies.set("example", "foo", { path: '/admin', expires: 7 }); // Sample 3
Get a cookie
...
How to extract base URL from a string in JavaScript?
...one";
//add it
document.body.appendChild(a);
//read the links "features"
alert(a.protocol);
alert(a.hostname)
alert(a.pathname)
alert(a.port);
alert(a.hash);
//remove it
document.body.removeChild(a);
You can easily do it with jQuery appending the element and reading its attr.
Update: There is no...