how to passing value from popup to the parent window as a variable

[perhapscwk]

how to passing value from popup to the parent window as a variable
which I can access and process the variable(string) in parent window?

such as from popup page, we have var_from_popup="abc", after the popup
closed, then from parent window, we can use alert(var_from_popup) and
it will show us the "abc"?

[acoder]

Use window.opener to refer to the parent, then you can set whatever variable you wish in the parent window.

[perhapscwk]

there is a variable var varwindow in primary window;

from popup, i set
window.opener.varwindow="abc"

then from primary window , i use alert(varwindow) but
it write as "underfinded" but not "abc"..why?

[Dormilich]

try

alert(window.varwindow);

regards

[perhapscwk]

not okay..why? it still show underfine..


from Mainpage.htm

 
var item1;
window.open("popup.htm", "name", "width=255,height=455");
alert(item1);
 

from popup.htm

 
<script type="text/javascript">
 
function get_value()
{
   window.opener.item1="123";
}
</script>
<form>
<textarea name='itembox' rows=10 cols=30></textarea>
<input type="button" onclick="get_value();window.close()" value="Submit">
</form>
 

[Dormilich]

@perhapscwk
you are mistaking properties with variables. try the code I posted.

[perhapscwk]

I try alert(window.item1) but still not okay..

[acoder]

It's going to be undefined because there simply isn't enough time before you alert it. When you call window.open, it's more or less asynchronous and moves onto the next line (the alert) without waiting for the window to load. You may not notice this as much on faster computers/simple pages. Even if it was synchronous, your code assumes item1 has already been set, but it's set from a button click.

[perhapscwk]

so how to pass back value from popup to primary window?

i use showmodaldialog ...it okay but not work for firefox 2..

[acoder]

@perhapscwk
That part works. It's just that you're trying to alert it too quickly. If, for example, you use a button to alert it in the parent window and click it after you click the pop-up window button, it should work.

i use showmodaldialog ...it okay but not work for firefox 2..

showModalDialog support was added in Firefox 3. If you want to support older browsers, either use a normal window.open or write your own pseudo-modal dialog.

[gits]

yes ... in case you use a normal window.open() you need to implement a mechanism that 'synchronizes' those async operations you trigger. how to do that best, depends a bit on your needs, or better, needed flow of your code.

kind regards