I am switching from debugging JS in Firefox to Chrome.
One thing that I am missing is this:
In Firefox I can see in the HTML see "[event]" that there is a custom event handler attached.
I think this preview is very handy.
In chrome I need to explicitly search for the event handler.
Is there a way to enable this feature (see event-handler in the tree) in chrome, too?
The feature you are looking for is available in google chrome dev tools
I have taken, the jobs links in stack overflow page itself, it has a click event handler, to see the event handler, select the Event Listeners tab in the right part(hilighted in Red) there is a possibility that it might be hiddent by >> , click to expand,
If the ancestor checkbox is checked please uncheck this, then you will get the clear view of for which event (e.g click) , on what element (e.g anchor tag), and on right side on which file with line number, click it to navigate there.
Hope this is what you are looking for.
it's available in chrome you can find it in developers option press
(CTRL+SHIFT+I) or F12
and then you will find tab named "Event Listener" in right hand upper corner if developer options is in full screen mode or else you'll find it it lower right corner.
And if you are unable to find that just simply find the >> symbol and click on it and select Event Listeners.
Here is the image for event listeners tab.
I think you can use getEventListners($0) api of chrome which gives the event listners of the particular selected element.
getEventListners($0) where $0 - The selected element in the DOM.
The console drawer can be added to the Elements tab by clicking on Esc key it will toggle the console drawer.Then in the console you can write getEventListners($0) as shown in the image.
As this is my first answer and don't have that much reputation as of now,it is not allowing me to directly add the image to the answer so I am really sorry for that. Please have a look at the image:
Inspecting google from my chrome browser.
I am working on a website that uses masonry. I know that the masonry rebuilds itself when the window width changes and I want to be able to trigger that rebuilding at will, like when one of the elements' height is changed. The problem is I don't see any event listeners related to the window's width that I can copy the code from. Is there a way I can see which events are being triggered at the moment?
In Chrome Developer Tools (press F12 within Chrome), go to the Sources tab.
In the right hand pane, expand > Event Listener Breakpoints and tick the ones you want to break on.
Alternatively, if it is using jQuery event handling, you can install the jQuery Debugger extension for Chrome Devtools, and it gives you a jQuery Events tab in the right hand column on the Elements tab. That shows you what events are bound to using jQuery for the selected element. Try selecting the <html> tag or the <body> tag and see if you can find it there.
One final option is to search in the JS you are using for the string "resize".
How can I inspect an element which disappears when my mouse moves away?
I don't know it's ID, class or anything but want to inspect it.
Solutions I have tried:
Run jQuery selector inside console $('*:contains("some text")') but didn't have any luck mainly because the element is not hidden but probably removed from the DOM tree.
Manually inspecting DOM tree for changes gives me nothing as it seems to be just too fast to notice what have changed.
SUCCESS:
I have been successful with Event breakpoints. Specifically - mousedown in my case. Just go to Sources-> Event Listener Breakpoints-> Mouse-> mousedown in Chrome. After that I clicked the element I wanted to inspect and inside Scope Variables I saw some useful directions.
(This answer only applies to Chrome Developer Tools. See update below.)
Find an element that contains the disappearing element. Right click on the element and apply "Break on... > Subtree Modifications." This will throw a debugger pause before the element disappears, which will allow you to interact with the element in a paused state.
Update Oct 22 2019: with the release of v. 70, it looks like FireFox finally supports this kind of debugging 2 3:
Update Sep 15 2020: Chrome has an "Emulate a focused page" option (you can get it from the [⌘]+[P] Command Menu, or Global Preferences) for this exact need. 5 - h/t #sulco on Twitter
An alternative method in Chrome:
Open devTools (F12).
Select the "Sources" tab.
While the element you want is displayed, press F8 (or Ctrl+/). This will break script execution and "freeze" the DOM exactly as it is displayed.
From this point, use Ctrl+Shift+C to select the element.
Open console
Type in setTimeout(()=>{debugger;},5000);
Press Enter
Now you have 5 seconds to make your element appears. Once it appeared, wait until the debugger hits. As long as you don't resume, you can play with your element and it won't disappear.
Useful tip to avoid repeating those steps above every time:
add this as a bookmarklet:
Bookmark any page
Edit this new bookmark
Replace the URL/location with: javascript:(function(){setTimeout(()=>{debugger;},5000);})();
Next time you wish to use this, just click/tap this bookmark.
Verified in 2022
Do the following:
Open the console and navigate to Elements tab
Type command + shift + P (OSX) or control + shift + P (Windows)
Type the word focused
Select Emulate a focused page from the the menu
Now clicking around in the console will not close the element.
I am using chrome on Mac there I've followed above steps but I'll try to explain a bit more:
Right click and go to inspect element.
Go to sources tab.
Then hover on the element.
Then using keyboard F8 or Command(Window) \. It will pause the screen in a static state and the element won't disappear on hover out.
In Firebug there are different solutions for this:
You can use Break On Mutate inside the HTML panel. (with this you'll also be able to find out which element it is)
You can right-click the element and choose Inspect Element with Firebug
Also you may want to follow issue 551, which asks for a way to temporarily block specific events.
Edit:
To find out which element it is you can also enable the HTML panel options Highlight Changes, Expand Changes and Scroll Changes Into View to make the element visible inside the HTML panel.
Sebastian
In my case, I used Expand recursively option on google chrome:
The steps are:
Inspect the dropdown field
Find the dynamic DOM (the purple highlight)
Right-mouse click on that dynamic DOM
Choose Expand recursively:
We can see all elements are there
Here is a demo:
Hover over the element with your mouse and press F8 (this in Chrome) to pause the script execution. The hover state will remain in visible to you.
It take you to the sources tab.
Go back to Elements tab. This time code will not disapper.
There Could be Dom element and the controller functions fighting at to refresh the session. Running the application by "Start without debugging" helped in my case.
enter image description here
you can view the elements appearing and disappearing in the inspector under elements. If you navigate to the element when it is visible you should be able to see it disappear or see its css change when it status changes.
This is possible with firebug in firefox or the built inspector in chrome.
I've written an article about debugging CSS of disappearing elements
Using hotkeys to automatically go into debugger mode with hotkeys keyboard shortcut:
Install the shortkeys extension
Click on the extension icon and chose "options":
Configure as follows:
Click "Save shortcuts" button (bottom-right)
Now, go to any page, make sure devtools is opened, and hit CTRL+SPACEBAR keys, while your inspection target element is visible.
I'm using Windows OS and this hotkeys combination is good for me and is not "taken" by any other shortcut, but of course, you can choose any other.
i had the same problem but i use Firefox it disappear as soon as i open inspect element found a solution:
open the 4 dashes(settings) go to web developer > Debugger and immediately press F8 which is the shortcut for the pause that stop the script before it kick and detect that you opened the developers tools
Is there a way to determine what Javascript function is called when you click on an item in a HTML page that has JS binded to the click event (added using jQuery, not the onClick tag attribute) ?
Obviously, the website is not mine and the code is minified.
This is available in all major browsers in the developer tools (usually press F12 to open).
In Chrome, for example, right click on the element, inspect element.
Then expand the 'Event Listeners' tab on the righthand side, find 'click' and expand that. It should give you a list of all potential listeners on the click event, including ones that would catch from bubbling up and a link to the function and its position in the file.
It can admittedly take a bit of hunting. If the code is minified most developer tools can expand it for you (e.g. the 'pretty print' option in webkit browsers like Chrome or tools 'Format javascript' in IE) or use an external tool, e.g. http://jsbeautifier.org/.
I have a div which is getting hidden/displayed by a click on another element. I can see the div's visibility CSS property changing in Firebug. The div is initialized using Microsoft Javascript library in code using:
Sys.Application.add_init(function() {$create.....
How do I get the actual Javascript which runs during run time with every click? Is there a way to intercept the js call and see what code is exactly running, like in Firebug or Chrome's Developer Tools?
(This is NOT a question on how to hide/unhide an element. I know how to do this)
I know in Chrome Dev Tools what you can try to do is:
Find the element clicking on which is causing your div to hide.
Expand it's Event Listeners in the right bar
Expand the click event
Then click the source file displayed there for the click event.
It would take you to where the click event function, so you can put a break point there. This is what you're asking, right?