JavaScript need help with a little script

[u0lf]

hi, i'm new here, i had this idea to start making a browser extension.
got no problems with the html part but when it came to js i started to struggle, mainly cause i dont know anything about js.
i wanted to make a script that replaces a certain text in the html page opened on the browser with another text while pressing a certain button.
got no problems with the button part since as i said before i know html *decently*, can anybody help me with the js part?
if that can help in any way the browser i'm creating it on is edge (so chrome too ig)

 

[LTomy]

Hello u0lf!

Here we change the content of an element with the id 'someId':

document.getElementById("someId").innerHTML = "Some text";

 

[u0lf]

so the someid is the content that has to be changed and some text is the text it has to be replaced with, right?

 

[LTomy]

An id is used to uniquely identify an element. Here we define an element with the id 'id1':

<p id="id1"></p>

Here we retrieve that element in JS:

document.getElementById("id1")

Here we change the content of the element:

document.getElementById("someId").innerHTML = "Some text";

After the code above is executed, the element becomes:

<p id="id1">Some text</p>

 

[u0lf]

ok but im trying to do this on a page that isnt mine, to make an example changing <something...... "enabled"> with <something...... "disabled"> on a forum page

 

[LTomy]

You really should follow a course on JS, it is hard to guide you if you do not have basic knowledges. We can not tell you what do to step-by-step.

 

[u0lf]

You really should follow a course on JS, it is hard to guide you if you do not have basic knowledges. We can not tell you what do to step-by-step.

ight