I am attempting to edit some javascript code that is in the html of the page (not an imported js file). I am able to set break points and step through them, but I can not edit the javascript during the execution or before/after execution. I prettified ({}) and un-prettified the files. The code piece is not minified in this section.
I could have sworn this used to be a common feature. But it has been over a year since I have done a lot of javascript.
Using chromium / chrome there are several methods to modify the html
of an existing document
. At devtools
Select Elements
tab, right click on the element to modify, select Edit as HTML
, make modifications in frame containing element, then click outside of editor frame
Select Sources
tab, select Snippets
tab, right click and select New
, write javascript
, to execute in existing window
press ▶
at right panel to run javascript
in Snippets
middle panel in existing window
. For example if $("body").on("click", function() {alert(123)})
is added as a Snippet
clicking body
element should call alert(123)
. The event should also be listed in Event Listeners
at right panel of devtools when inspecting element. Removing the listener may be somewhat more challenging; even if you click remove
when hovering over the listener at right panel, as the event is already attached to the element. The simplest method would be to add a namespace
to the event $("body").on("click.abcnamespace", handler)
, then call $("body").off("click.abcnamespace")
Modifying text existing handlers will not automatically affect , or cancel the event handler previously attached to the element. The simplest approach would be to copy and save existing javascript
containing event handler, select Elements
tab , right click on element that has event listener, select Event Listeners
at right panel, when hovering over the window
, document
or HTMLElement
having event attached a button should be displayed that says Remove
. Click that button to remove the event listener. You should then be able to modify the saved event listener and add it back to the existing document
with modifications being applied
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