Javascript and the window.document object. How to change value in document -

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i have normal page , popup window. on popup window, modifying javascript callback change value on page (the page behind popup window). struggling on navigating field in javascript.

i have following:

window.document.getelementbyid('mynewfield').value = newvalue;

but not finding field , needs changed to:

window.id-of-my-window-behind.document.getelementbyid('mynewfield').value = newvalue;

how can find out id is? there print_r funciton javascript?

i think you're looking is:

window.opener

you can use follows:

window.opener.document.getelementbyid('mynewfield').value = newvalue;

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