Is it possible to execute a javascript in a new window with window.location.href?

Question

I am trying to open a new window and execute a javascript code on the new page.

I'm not really sure why it doesn't execute the code - maybe it's not possible like this - anyway, the new window opens but the javascript doesn't get executed.

Here is my code:

var nstart = window.open(" http://examplepage.html ");

function loginnow(){
var htmlstring = "javascript: var zTextFields = window.document.getElementsByTagName(\"input\"); for (var i=0; i < zTextFields.length; i++) {thefield=zTextFields[i].name; if (!thefield) thefield=zTextFields[i].id; if (thefield == \"login\") zTextFields[i].value=\"_ext_cancom\"; if (thefield == \"password\")zTextFields[i].value=\"canfinag?!\";} window.document.getElementById(\"sign-in\").click();";

nstart.location.href = htmlstring;
}

nstart.addEventListener('load', loginnow, true);

Is it even possible to execute code like this? Please help ^-^ I'm also using '\\' as an escape character so I can use " in the string -> \\"

When I replace the \\" with " and directly inject it into the page the script works fine...

Answer 1

Maybe you can add the javascript you want to execute in the new new page, and then make it run when document ready . So you will can just open the new page, JS will run automatically

Answer 2

If the new window is on the same domain you can access the contents by doing something like this.

var nstart = window.open("http://examplepage.html");

function loginnow() {
  var zTextFields = nstart.document.getElementsByTagName("input"); 
  for (var i=0; i < zTextFields.length; i++) {
    thefield=zTextFields[i].name;
    if (!thefield) 
      thefield=zTextFields[i].id; 
    if (thefield == "login") 
      zTextFields[i].value="_ext_cancom"; 
    if (thefield == "password")
      zTextFields[i].value="canfinag?!";
  } 
  nstart.document.getElementById("sign-in").click();
}

nstart.addEventListener('load', loginnow, true);

You shouldn't really try to inject code onto the new window but you can access the dom and run javascript from the parent window.