Javascript event handler order?

If you use JQuery to bind your events, it guarantees that handlers are fired in the same order that they were bound. Otherwise the order is officially undefined.

If you use JQuery to bind your events, it guarantees that handlers are fired in the same order that they were bound. Otherwise the order is officially undefined. If you cannot use JQuery or a similar framework you can easily simulate this by using your own custom even binding, where your generic handler is a function which keeps an array of functions and calls them in order.

For an answer to your question that isn't also a question, see this post or this one or this one.

Because they represent separate modules, which may or may not occur together. Writing them as a single function (which is obvious) has the effect of over coupling the code. – Justin Alexander Feb 28 at 15:33.

Normally you'd have the Save event handler call Validate() which will return true if everything is fine and ready to be saved. Function onSaved() { if (!validate()) { // set class return; } // do the save }.

Already answered - but just to add this piece of knowledge, the order of event handlers can not be relied upon. It may in any given implementation be predictable, but this can change from one (Javascript) implementation to the next and/or over time. The only thing certain is that they all will be executed - but not in what order.

Note that the situation is similar when there is an event handler for a DOM object and another one for the same event for a child or parent - which of those is executed first is not always clear as well. See quirksmode.org/js/events_order.html.

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