How to paste text in <div> with chrome extension?

问题

I would like to paste some pre-defined text to a textbox of a website using chrome extension. The target website is https://www.urlgot.com/. It is a seemly simple webpage with only one input textbox. I had found a solution to get my interesting DOM content. But how to manipulate the DOM to paste my text into the "placeholder" then? As a neophyte in chrome extension scripting, I really need some advice.

The DOM of interesting is as below,

<div class="form-group" id="urlFormGroup">
 <input type="text" class="form-control" id="mediaWebUrl" autocomplete="off" placeholder="paste link here ..." onpaste="parse()">

I think I should find some way to replace the "paste link here ..." text with my own text input. But I don't know how to do it. Thank you.

回答1:

You can use this:

document.getElementById('mediaWebUrl').setAttribute('placeholder','My own text...');

来源：https://stackoverflow.com/questions/56985016/how-to-paste-text-in-div-with-chrome-extension