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JavaScript: What are .extend and .prototype used for?
..., Math, and even your own custom ones.
Date.prototype.lol = function() {
alert('hi');
};
( new Date ).lol() // alert message
In the snippet above, I define a method for all Date objects ( already existing ones and all new ones ).
extend is usually a high level function that copies the prototy...
How to detect pressing Enter on keyboard using jQuery?
...:
$(document).on('keypress',function(e) {
if(e.which == 13) {
alert('You pressed enter!');
}
});
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Is it possible to use getters/setters in interface definition?
...value) {
this._name = value;
}
}
var example = new Example();
alert(example.Name);
In this example, the interface doesn't force the class to use getters and setters, I could have used a property instead (example below) - but the interface is supposed to hide these implementation detai...
How to find keys of a hash?
...t.keys performing this operation:
var obj = { "a" : 1, "b" : 2, "c" : 3};
alert(Object.keys(obj)); // will output ["a", "b", "c"]
Compatibility details can be found here.
On the Mozilla site there is also a snippet for backward compatibility:
if(!Object.keys) Object.keys = function(o){
if (...
Make browser window blink in task Bar
...ss platform, and even if they just have it in a different tab.
newExcitingAlerts = (function () {
var oldTitle = document.title;
var msg = "New!";
var timeoutId;
var blink = function() { document.title = document.title == msg ? ' ' : msg; };
var clear = function() {
clea...
Difference between $(window).load() and $(document).ready() functions
...y(function() {
// executes when HTML-Document is loaded and DOM is ready
alert("document is ready");
});
$(window).load(function() {
// executes when complete page is fully loaded, including all frames, objects and images
alert("window is loaded");
});
...
Why is document.body null in my javascript?
...n.style.color = "red";
document.body.appendChild(mySpan);
alert("Why does the span change after this alert? Not before?");
}
</script>
</head>
See demo.
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jQuery Ajax error handling, show custom exception messages
Is there some way I can show custom exception messages as an alert in my jQuery AJAX error message?
20 Answers
...
JavaScript before leaving the page
...e page is unloaded, but you cannot redirect from there (Chrome 14+ blocks alerts inside onunload):
window.onunload = function() {
alert('Bye.');
}
Or with jQuery:
$(window).unload(function(){
alert('Bye.');
});
s...
How do I check whether a checkbox is checked in jQuery?
... and this is working absolutely fine:
$("#checkkBoxId").attr("checked") ? alert("Checked") : alert("Unchecked");
Note: If the checkbox is checked it will return true otherwise undefined, so better check for the "TRUE" value.
...