javascript - How do I view events fired on an element in Chrome DevTools? - Stack Overflow

admin管理员组

文章数量:1125973

I have a customizable form element on a page from a library. I want to see what JavaScript events are fired when I interact with it because I am trying to find out which event handler to use.

How do I do that using Chrome Web Developer?

I have a customizable form element on a page from a library. I want to see what JavaScript events are fired when I interact with it because I am trying to find out which event handler to use.

How do I do that using Chrome Web Developer?

• javascript
• dom-events
• google-chrome-devtools

Share Improve this question Follow edited Dec 31, 2024 at 16:07 ahuemmer 2,0531212 gold badges2727 silver badges3636 bronze badges asked Apr 18, 2012 at 16:23 John HoffmanJohn Hoffman 18.6k2121 gold badges5959 silver badges8484 bronze badges 4

• 15 This bookmarklet can be helpful: sprymedia.co.uk/article/Visual+Event+2 – scytale Commented Oct 10, 2012 at 12:11
• 1 The answer here is valuable, but the bookmarklet above ^ is actually what solved my problem. sprymedia.co.uk/article/Visual+Event+2 – Jazzy Commented Jul 15, 2014 at 20:39
• What do you mean by Chrome Web Developer? The old Web Developer extension for Google Chrome? Or Chrome DevTools? – Philippe Cloutier Commented Mar 5, 2024 at 19:33
• @PhilippeCloutier it's about Chrome Dev Tools. – rd51 Commented Mar 5, 2024 at 19:42

Add a comment  | 

6 Answers 6

Sorted by: Reset to default 1224

You can use monitorEvents function.

Just inspect your element (right mouse click → Inspect on visible element or go to Elements tab in Chrome Developer Tools and select wanted element) then go to Console tab and write:

monitorEvents($0)

Now when you move mouse over this element, focus or click it, the name of the fired event will be displayed with its data.

To stop getting this data just write this to console:

unmonitorEvents($0)

$0 is just the last DOM element selected by Chrome Developer Tools. You can pass any other DOM object there (for example result of getElementById or querySelector).

You can also specify event "type" as second parameter to narrow monitored events to some predefined set. For example:

monitorEvents(document.body, 'mouse')

List of this available types is the following as of 2023-01-30:

• mouse
  "mousedown", "mouseup", "click", "dblclick", "mousemove", "mouseover", "mouseout", "mousewheel"
• key
  "keydown", "keyup", "keypress", "textInput"
• touch
  "touchstart", "touchmove", "touchend", "touchcancel"
• control
  "resize", "scroll", "zoom", "focus", "blur", "select", "change", "submit", "reset"

Taken from here.

I made a small gif that illustrates how this feature works:

• Hit F12 to open Dev Tools
• Click the Sources tab
• On right-hand side, scroll down to "Event Listener Breakpoints", and expand tree
• Click on the events you want to listen for.
• Interact with the target element, if they fire you will get a break point in the debugger

Similarly, you can right click on the target element -> select "inspect element" Scroll down on the right side of the dev frame, at the bottom is 'event listeners'. Expand the tree to see what events are attached to the element. Not sure if this works for events that are handled through bubbling (I'm guessing not)

Visual Event is a nice little bookmarklet that you can use to view an element's event handlers. On online demo can be viewed here.

For jQuery (at least version 1.11.2) the following procedure worked for me.

1. Right click on the element and open 'Chrome Developer Tools'
2. Type $._data(($0), 'events'); in the 'Console'
3. Expand the attached objects and double click the handler: value.
4. This shows the source code of the attached function, search for part of that using the 'Search' tab.

And it's time to stop re-inventing the wheel and start using vanilla JS events ... :)

This won't show custom events like those your script might create if it's a jquery plugin. for example :

jQuery(function($){
 var ThingName="Something";

 $("body a").live('click', function(Event){
   var $this = $(Event.target);
       $this.trigger(ThingName + ":custom-event-one");
 });

 $.on(ThingName + ":custom-event-one", function(Event){
   console.log(ThingName, "Fired Custom Event: 1", Event);
 })

});

The Event Panel under Scripts in chrome developer tools will not show you "Something:custom-event-one"

To list all event handlers on the window object in Chrome, you can type window.getEventListeners(window) or for a specific element window.getEventListeners(document.body)

本文标签： javascriptHow do I view events fired on an element in Chrome DevToolsStack Overflow