ryanve ryanve - 2 years ago 97
Javascript Question

Bind to ready and resize at same time using jQuery .on()

This works for running the same code on both ready and resize:

$(document).ready(function() {

$(window).resize(function() {

// Stuff in here happens on ready and resize.

}).resize(); // Trigger resize handlers.


How would you accomplish the same result using jQuery.on() ?

Answer Source

on can be used to wire up the resize and ready events just like any other event.

So for your case, you could create a function that has the code you want to happen for resize and ready, and then pass it to both calls to on.

If you want to keep your enclosing scope clean, you could do all this in an immediately executing function:

(function() {
    function stuffForResizeAndReady(){
       // Stuff in here happens on ready and resize.

    $(window).on("resize", stuffForResizeAndReady);
    $(document).on("ready", stuffForResizeAndReady);

2012-07-25: There are 2 differences to be aware of when using .on() to attach ready handlers:

  • Ready handlers added via $(fn) and $(document).ready(fn) are "retro-fired" while ones added by .on() are not. Using those, if you add a handler after the DOM is already loaded, the fn will be fired immediately. If you add a handler via .on('ready', fn) after the DOM is loaded, it will not be fired by jQuery, but you can manually .trigger('ready') it.

  • When you use $(fn) or $(document).ready(fn) to add a ready handler, the fn receives jQuery as its 1st arg, allowing the familar jQuery(function($){ }) usage. If you use $(document).on('ready', fn), the 1st arg that the fn receives is an event object. In both cases this inside the fn is the document. If you were to do something abnormal like $('#foo').on('ready', fn) for the purpose of triggering, this would be the #foo element.

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