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Javascript when to use prototypes
...var myObject = function () {
};
myObject.prototype.getA = function (){
alert("A");
};
myObject.getB = function (){
alert("B");
};
myObject.getB(); // This works fine
myObject.getA(); // Error!
var myPrototypeCopy = new myObject();
myPrototypeCopy.getA(); // This works, too.
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Why aren't ◎ܫ◎ and ☺ valid JavaScript variable names?
...r, are purely symbols; they are not associated with any alphabet.
The ECMAScript standard, chapter 7.6 (which all the browsers except Internet Explorer are following), states that an identifier must start with one of the following.
a Unicode letter
$ or _
\ followed by a unicode escape sequence.
...
Implode an array with JavaScript?
...ters:
var bits = ['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd'];
alert(bits.join()); // H,e,l,l,o, ,W,o,r,l,d
alert(bits.join('')); // Hello World
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Assign variable in if condition statement, good practice or not? [closed]
...(x = processorIntensiveFunction()) { // declaration inside if intended
alert(x);
}
Why should that function be allowed to run a 2nd time with:
alert(processorIntensiveFunction());
Because the first version LOOKS bad? I cannot agree with that logic.
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What is the most efficient way to create HTML elements using jQuery?
...of an element
// see below statements
}
var end = new Date().getTime();
alert( end - start );
var e = $( document.createElement('div') ); // ~300ms
var e = $('<div>'); // ~3100ms
var e = $('<div></div>'); // ~3200ms
v...
Getting the object's property name
...
i is the name.
for(var name in obj) {
alert(name);
var value = obj[name];
alert(value);
}
So you could do:
seperateObj[i] = myObject[i];
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impr...
How to get the focused element with jQuery?
...
Try this:
$(":focus").each(function() {
alert("Focused Elem_id = "+ this.id );
});
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How to send multiple data fields via Ajax? [closed]
...here: http://api.jquery.com/jQuery.ajax/
So if that doesn't work, I would alert those variables to make sure they have values.
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How to tell if a browser is in “quirks” mode?
...afari, and IE, run this javascript in the address bar:
javascript:window.alert('You are in ' + (document.compatMode==='CSS1Compat'?'Standards':'Quirks') + ' mode.')
(note that you'll need to re-type the javascript: portion after pasting into your address bar, due to recent security changes)
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JavaScript loop through json array?
...ate like this :
for (var key in json) {
if (json.hasOwnProperty(key)) {
alert(json[key].id);
alert(json[key].msg);
}
}
And it gives perfect result.
See the fiddle here : http://jsfiddle.net/zrSmp/
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