Force.com Canvas Developer's Guide

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Subscribing to Parent Events

The following code example shows how to call the subscribe method so that a canvas app can subscribe to parent events. This example handles the onscroll event that fires when the user scrolls in the parent window.

1swfobject.registerObject("clippy.codeblock-0", "9");//Subscribe to the parent window onscroll event.
2Sfdc.canvas(function() {
3    sr = JSON.parse('<%=signedRequestJson%>');
4    // Capture the onScrolling event of the parent window
5    Sfdc.canvas.client.subscribe(sr.client,
6        {name : 'canvas.scroll', onData : function (event) {
7            console.log("Parent's contentHeight; " + event.heights.contentHeight);
8            console.log("Parent's pageHeight; " + event.heights.pageHeight);
9            console.log("Parent's scrollTop; " + event.heights.scrollTop);
10            console.log("Parent's contentWidth; " + event.widths.contentWidth);
11            console.log("Parent's pageWidth; " + event.widths.pageWidth);
12            console.log("Parent's scrollLeft; " + event.widths.scrollLeft);
13        }}
14    );
15});