CODEWITHSUNDEEP
javascriptjqueryevent-binding
CheeZe5
CheeZe5

Reputation: 995

Is there a way to change the eventData after binding a event with jQuery?

Say you bind a handler to something with bind() or on() and specify data such as { color : "red" }. Later on, circumstances change and you want the event to be triggered with { color : "blue"}. Is there a way to change this without removing the handler with unbind() or off() and rebinding with the new data object?

Upvotes: 0

Views: 979

Answers (3)

adeneo
adeneo

Reputation: 318302

No, there is no way to change this, eventData passed in can not be changed later, as that is the point, locking the data inside the event handler

var data = {test : 'test'};

$('element').on('click', data, function(e) {
    // e.data will always be {test : 'test'}
});

data = {test: 'foo'}; // doesn't matter

FIDDLE

The reason for this is that eventData was intended for cases where a closure would normally be used, like

for ( var i = 0; i < 5; i++ ) {
    $("button").eq(i).on( "click", { value: i }, function( event ) {
         var i = event.data.value;

         // now i can be accessed with event.data.value without extra closures
   });
}

so the only way to change the data is to rebind the event, or preferably use another method if you need to change the data, and you're mentioning triggering the event handler, and if you're using jQuery to do that, you can pass data that way too by using an event object inside trigger()

$('element').on('click', function(event) {
    var data = event.custom;
});

$('element').trigger({
    type: 'click',
    custom: {color: 'red'}
}); 

$('element').trigger({
    type: 'click',
    custom: {color: 'blue'}
});

FIDDLE

Upvotes: 4

user1516127
user1516127

Reputation:

I found another question that I think will help.

jQuery find events handlers registered with an object

Looks like you look at the jQuery variable directly to see what's been posted:

jQuery._data( elem, "events" );

Looks like this isn't safe and secure and I don't know if you can change it but it does let you view it.

I think it's just better to remove the event and then add the new one.

Upvotes: 0

DJL
DJL

Reputation: 2200

You could pass in a method that gets the data? i.e.

var data = {test : 'test'};
var DataGetter = function() { return data;};
$('element').on('click', DataGetter, function(e) {
var data=e.data();
});
data.test='Hello';
data = {hello: 'world'};

Upvotes: 1

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