Javascript – Prevent click event from firing when dblclick event fires

dom-eventsjavascript

I'm handling both the click and dblclick event on a DOM element. Each one carries out a different command, but I find that when double clicking on the element, in addition to firing the double click event, the click event is also fired twice. What is the best approach for preventing this behavior?

Best Answer

In case anyone else stumbles on this (as I did) looking for an answer, the absolute best solution that I could come up with is the following:

    $node.on('click',function(e){
      if(e.originalEvent.detail > 1){
         return;
        /* if you are returning a value from this
         function then return false or cancel 
         the event some other way */
      }
    });

Done. If there is more than one click back to back, the second, third,etc. will not fire. I definitely prefer this to using any sort of timers.

I got myself pointed in this direction by reading this.

Incidentally: I was first researching this problem because I accidentally double clicked a paginated link, and the event fired and finished twice before the callback could happen.

Before coming up with the code above, I had

 if e.originalEvent.detail === 2 //return

however, I was able to click on the link 3 times (a triple click), and though the second click didn't fire, the third did

Related Solutions

Javascript – How to find out which DOM element has the focus

Use document.activeElement, it is supported in all major browsers.

Previously, if you were trying to find out what form field has focus, you could not. To emulate detection within older browsers, add a "focus" event handler to all fields and record the last-focused field in a variable. Add a "blur" handler to clear the variable upon a blur event for the last-focused field.

If you need to remove the activeElement you can use blur; document.activeElement.blur(). It will change the activeElement to body.

Javascript – How to debug JavaScript / jQuery event bindings with Firebug or similar tools

See How to find event listeners on a DOM node.

In a nutshell, assuming at some point an event handler is attached to your element (eg): $('#foo').click(function() { console.log('clicked!') });

You inspect it like so:

jQuery 1.3.x

var clickEvents = $('#foo').data("events").click;
jQuery.each(clickEvents, function(key, value) {
  console.log(value) // prints "function() { console.log('clicked!') }"
})

jQuery 1.4.x

var clickEvents = $('#foo').data("events").click;
jQuery.each(clickEvents, function(key, handlerObj) {
  console.log(handlerObj.handler) // prints "function() { console.log('clicked!') }"
})

See jQuery.fn.data (where jQuery stores your handler internally).

jQuery 1.8.x

var clickEvents = $._data($('#foo')[0], "events").click;
jQuery.each(clickEvents, function(key, handlerObj) {
  console.log(handlerObj.handler) // prints "function() { console.log('clicked!') }"
})

Best Answer

Related Solutions

Javascript – How to find out which DOM element has the focus

Javascript – How to debug JavaScript / jQuery event bindings with Firebug or similar tools

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