CODEWITHSUNDEEP
javascriptjqueryjquery-events
N. Taylor Mullen
N. Taylor Mullen

Reputation: 18301

Elegant way to check if JQuery object has an event under a namespace

For Instance, lets say we want to check if this has any events under the namespace proxy; I currently do:

// 'this' is not a DOM element
if ($($(this).data('events')).length === 0 || $($(this).data('events').proxy).length === 0) {
    // Do something If there are no events
}

This is how I do it now in order to assure that the .data('events') object has been created (if there has not been a .bind called prior to reading .data('events') it will be undefined) AND it has an event under the proxy namespace.

Is there a better way to do this without throwing an error? It'd be great if I could do something like:

if($(this).data('events').proxy.length === 0) {
    // Do something if there are no proxy events
}

However, if there has not been anything bound to this the code snippet will throw an error because .data('events') will be undefined and therefore will not have a .proxy accessor.

Upvotes: 3

Views: 1090

Answers (1)

Matt Ball
Matt Ball

Reputation: 359816

Just beef up the truthiness checks accordingly:

var data_events = $(this).data('events');
if(!data_events || data_events.proxy.length === 0) {
    // Do something if there are no proxy events
}

Upvotes: 1

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