Jquery: add existing function to an Jquery event

Question

in all jquery examples i see this kind of code:

$('.menu a').each(function(){
 $(this).animate({paddingLeft: $(this).width()}, 200);
 });

What they do here is create a function 'on the fly' (is that called an anonymous delegate?)

but what if i have an existing function, which wants to have access to the $(this) also?

let's say i have this function:

function doAnimate(ctl){
  //do something here
{

How can i use that function in the jquery statement?

Reason i ask is that i want to use this function in more jquery statements, and i don't want to type the anonymous delegate multiple times.

I've tried this, but that gives me an error:

$("#<%=txtReceiverEmailEcard1.ClientID  %>").blur(blurWatermark($(this), 'Your email address'));

Correct, 'on the fly' is anonymous function

Tx3
– Tx3

2011-01-14 09:00:22 +00:00
Commented Jan 14, 2011 at 9:00 — Tx3
– Tx3, Commented Jan 14, 2011 at 9:00

Tx3 · Accepted Answer · 2011-01-14 09:08:17Z

6

This is from the jQuery API documentation

More importantly, the callback is fired in the context of the current DOM element, so the keyword this refers to the element.

And the signature of the method is

.each( function(index, Element) )

function(index, Element)A function to execute for each matched element.

You can then write

$('.menu a').each(myFunction)

function myFunction(index, Element) { 
    alert(this); /* this points to the element */
}

That basically means that you can get all kind of nice information (like index) to your callback.

answered Jan 14, 2011 at 9:08

Tx3

6,9284 gold badges39 silver badges52 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Shadikka · Accepted Answer · 2011-01-14 09:04:50Z

2

Simply:

$('.menu a').each(doAnimate)

Wherever an anonymous function works, a reference to a "normal" one works just as well. :) Then you need to use the function parameters like

function doAnimate (index, elem) {
    $(elem).animate({paddingLeft: $(elem).width()}, 200);
}

edited Jan 14, 2011 at 9:04

answered Jan 14, 2011 at 8:59

Shadikka

4,3162 gold badges18 silver badges19 bronze badges

3 Comments

Michel Over a year ago

and can i pass the $(this) also?

Michel Over a year ago

reason i ask is that it doesn't work right now, i've edited the question

Shadikka Over a year ago

Sorry, the function parameters need to be (index, Element) instead of just (Element), edited my answer. See api.jquery.com/each :)

rahul · Accepted Answer · 2011-01-14 09:01:07Z

1

You can try something like

$('.menu a').each(function(){
    doAnimate($(this));
});

If its a reusable one then develop a plugin that you can easily associate with jQuery objects.

answered Jan 14, 2011 at 9:01

rahul

188k50 gold badges239 silver badges266 bronze badges

Collectives™ on Stack Overflow

Jquery: add existing function to an Jquery event

3 Answers 3

Comments

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related