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javascriptjqueryeventsparametersanonymous-function
MegaMatt
MegaMatt

Reputation: 23763

How To Access jQuery Event Without Using Anonymous Callback Parameter

Typically, when needing to access an event, you do so via the parameter specified in the callback function:

$button.live("click", function(ev) {
  // do something with ev here, like check 'ev.target'
}

But instead (for reasons too complicated to get into here), I do not want to use an anonymous callback function, but instead specify a function to call, like this:

$button.live("click", functionToCall(ev, $(this));

So you'll notice that I included 'ev' as a parameter to functionToCall(), but this obviously won't work because I'm not using the anonymous callback function. But I do still need to access that click event (to check ev.target) within functionToCall(). My question is, how do I access this event? It would be nice if I could do something like this:

$button.live("click", functionToCall($(this));

and

function functionToCall($item) {

   var target = $item.event("click").target;
   // do something with target
}

Any ideas would be very much appreciated. Thanks.

Upvotes: 7

Views: 3325

Answers (4)

CAbbott
CAbbott

Reputation: 8098

You could call a function within the anonymous callback function:

$button.live("click", function(ev) {
    functionToCall(ev, $(this));
}

EDIT: I think this may be what you're looking to do (untested):

function handleClick(ev) {
    $(this).die("click");
    // ...whatever processing to do...
    $(this).live("click", handleClick);
}

$button.live("click", handleClick);

I believe the $(this) will refer to the button object in which the function was called.

Upvotes: 2

jitter
jitter

Reputation: 54605

Original answer

function test(eve) {
  alert(eve.type);
  alert(this);
  //$(this) if you need it as jQuery object
}
$([yourselector]).live("click", test);

You will automatically get the event in the eve parameter.

Answer to extended question in comment

Passing in a parameter makes it a little more difficult. If you need an explanation why I did it like this: Ask.

function helper(customparam) {
    return function(eve, selector) { actualFunction(eve, selector, customparam, this) };
}

function actualFunction(eve, selector, customparam, self) {
    alert(eve.type);
    alert(selector);
    alert(customparam);
    alert(self); //self is now the element we clicked on
    //$(self) if you need it as jQuery object
    //using this won't work anymore as this is now window
}

$([yourselector]).live("click", helper([yourparameter]));

Upvotes: 14

G-Wiz
G-Wiz

Reputation: 7426

Remember that jQuery re-assigns this when it calls event handlers, by using the Function methods call or apply. So when functionToCall is invoked, this is the DOM element of $button.

var functionToCall(ev) {
    var $this = $(this);
    $this.die("click", functionToCall);
    // stuff
    $this.live("click", functionToCall);
}

$button.live("click", functionToCall);

Upvotes: 1

Josh Pearce
Josh Pearce

Reputation: 3455

var mythis = $(this);
var callback = function(ev) {
    var target = mythis.event("click").target;
}


$button.live("click", callback);

Upvotes: 0

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