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How can I trap the unknown cause of a Javascript popup?

Answer 1

+3 A:

The green policy document opens a popup with itself on load:

<body onload="MM_openBrWindow('green%20policy.htm','green','width=900,height=600')">

This is inside green policy.htm

David Hedlund 2009-12-26 14:10:48

Answer 2

A:

Just to add to David's answer, the function that gets executed on body load in the page at http://hijinxmusic.co.uk/green%20policy.htm essentially calls window.open()

function MM_openBrWindow(theURL,winName,features) { //v2.0
    window.open(theURL,winName,features);
}

Russ Cam 2009-12-26 15:38:18

Answer 3

A:

The bigger problem is that the page that you are trying to open in a new window is the same window that the user is already looking at, which doesn't make any sense. What's more is that if the popup blocker wasn't blocking window creation, you would have an infinite loop of popups (load green policy.html, open a new green policy.html, load green policy.html, etc). Where did you want the popup to happen?

Also, to add to Russ Cam's answer, you can detect when the popup fails to open by checking the return value of window.open. I have used this successfully in Firefox, IE, Opera and Safari (haven't needed to test in Chrome). Using the provided function, this is how I handle blocked popups:

function MM_openBrWindow(theURL,winName,features) { //v2.0
    if ( !window.open(theURL, winName, features) ) {
        // Window failed to open:
        // show a HTML dialog/popover that prompts the user to allow
        // popups from this site, along with a `cancel` and `try again`
        // button.  The `try again` button will attempt to open the
        // window again with the provided parameters
        dialog.popupBlockedNotice.open(arguments);
    }
    // Window opened successfully.
}

Justin Johnson 2009-12-26 22:10:05

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How can I trap the unknown cause of a Javascript popup?

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