如何在 Chrome 扩展中使用 Javascript 触发 HTML 元素文本的更改事件？

Question

I'm creating an chrome extension, and having issue that even if I changed the element text, the submit button not enables as usual and other stuff is not processing as manual typing.

I'm trying to fire the text changed event to process the elements normal behavior of manual typing using following script;

var el2=document.getElementById("tmsg");
el2.innerText="hello world";
try{                                     
    el2.fireEvent("onchange");
}catch(error)
{
   alert("err:"+error);
}

However, the text is set, but getting following error

TypeError: el2.fireEvent is not a function

I'm looking for solution with java script, without JQuery solutions, but none worked for me.

Can anyone please point me what I'm doing wrong here, or better way to do that?

Answer 1

You are getting that error because eventTarget.fireEvent() is a proprietary method used in Internet Explorer.

The modern and standard way to manually dispatch events, according to MDN is as follows:

// CREATE EVENT
const event = new Event('change', {bubbles: true});

// GET TARGET ELEMENT
const el2 = document.getElementById('tmsg');

// DISPATCH EVENT
el2.dispatchEvent(event);

Hope it works.