how to inject text into a textbox with firefox extension

Question

This question was probably asked few time by now... but I didn't find any solution in the last 2 days so I'm asking it in here.
I need to inject some text into a textbox that has an ID and I already know it. the scenario is like that:

• The user insert a text into the textbox inside my toolbar.
• The user clicks on a button in my toolar.
• The function in the button should redirect the user to a new page in the background, inject a text into a specified textbox and click a button in that webpage.
• Return a link that is generated on the webpage.

I know how to open a new webpage. now all is left is the rest. I can't seem to inject the text into the specified textbox.

Also to note, I can't use greasemonkey on this project and that's why I will have to write everything I'll need to write.

If you can direct me to the starting point for this problem it would be nice.

Answer 1

The textbox is XUL textbox or html textarea?

It look like your scenario is simulate submit a form in background, why not just directly create a XMLHttpRequest to do this, no need to interactive with UI.

Update:

If it is a XUL textbox, you can use value property

var textbox = window.document.getElementById(textboxId);
if (textbox) {
    textbox.value = 'your text';
}