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Why is using “for…in” for array iteration a bad idea?
I've been told not to use for...in with arrays in JavaScript. Why not?
27 Answers
27...
How to calculate date difference in JavaScript?
...kizebear—tested in IE, Firefox and Safari, works fine. It uses basic ECMAScript that I'd expect to work in any browser, what doesn't work for you?
– RobG
May 17 '13 at 5:27
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How to debug JavaScript / jQuery event bindings with Firebug or similar tools?
...dow.console) in case it gets left in the code (much easier to do than with alert()) and breaks IE.
– thepeer
Jan 24 '12 at 16:46
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Turning live() into on() in jQuery
...y ".live()" method is depreciated since v1.7 and removed in v1.9. Fix your scripts by using the ".on()" method instead. Surprisingly this also affects the current Microsoft jquery.unobtrusive-ajax.js v2.0.20710.0 (Microsoft didn't update their scripts either so now it is broken).
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Appending to an object
I have an object that holds alerts and some information about them:
13 Answers
13
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.prop() vs .attr()
...d Boolean property, which has existed and worked flawlessly in every major scriptable browser since 1995:
if (document.getElementById("cb").checked) {...}
The property also makes checking or unchecking the checkbox trivial:
document.getElementById("cb").checked = false
In jQuery 1.6, this unambi...
Should I be using object literals or constructor functions?
...c: "a public variable"
thisIsAlsoPublic: function () {
alert(that.thisIsPublic);
}
};
var secret = "this is a private variable"
function secretFunction() { // private method
secret += "!"; // can manipulate private variables
that.thisIsPublic...
How to execute a function when page has fully loaded?
I need to execute some JavaScript code when the page has fully loaded. This includes things like images.
13 Answers
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Listening for variable changes in JavaScript
...ster a listener using the following:
x.registerListener(function(val) {
alert("Someone changed the value of x.a to " + val);
});
So whenever anything changes the value of x.a, the listener function will be fired. Running the following line will bring the alert popup:
x.a = 42;
See an example...
Best way to store JSON in an HTML attribute?
...to attribute sizes.
If you do run into them, then store the data in a <script>. Define an object and map element ids to property names in that object.
What if the JSON contains special characters? (e.g. {test: '<"myString/>'})
Just follow the normal rules for including untrusted d...