tampermonkey script stops working if I change the page

Question

I am using Tampermonkey to save time on frequent tasks. The goal is to get content of an element on www.example1.com, navigate to another page, and do stuff there. The starting page is www.example1.com as seen from match. This is the code I am using:

//@match  http://example1.com

var item = document.getElementById("myId").textContent;

window.open("http://example2.com","_self");

setTimeOut(function(
//perform clicks on this page
){},3000);

None of the code after changing URLs ever gets executed. Why, and what is the workaround?

Answer 1

Allow the userscript on both urls and use GM_setValue/GM_getValue to organize the communication.

//@match   http://example1.com
//@match   http://example2.com
//@grant   GM_getValue
//@grant   GM_setValue

if (location.href.indexOf('http://example1.com') == 0) {
    GM_setValue('id', Date.now() + '\n' + document.getElementById("myId").textContent);
    window.open("http://example2.com","_self");
} else if (location.href.indexOf('http://example2.com') == 0) {
    var ID = GM_getValue('id', '');
    if (ID && Date.now() - ID.split('\n')[0] < 10*1000) {
        ID = ID.split('\n')[1];
        .............. use the ID
    }
}

• This is a simplified example. In the real code you may want to use location.host or location.origin or match location.href with regexp depending on what the real urls are.

• To pass complex objects serialize them:

  GM_setValue('test', JSON.stringify({a:1, b:2, c:"test"}));
  

  try { var obj = JSON.parse(GM_getValue('test')); }
  catch(e) { console.error(e) }