Canvas Developer 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.
//Subscribe to the parent window onscroll event.
Sfdc.canvas(function() {
sr = JSON.parse('<%=signedRequestJson%>');
// Capture the onScrolling event of the parent window
Sfdc.canvas.client.subscribe(sr.client,
{name : 'canvas.scroll', onData : function (event) {
console.log("Parent's contentHeight; " + event.heights.contentHeight);
console.log("Parent's pageHeight; " + event.heights.pageHeight);
console.log("Parent's scrollTop; " + event.heights.scrollTop);
console.log("Parent's contentWidth; " + event.widths.contentWidth);
console.log("Parent's pageWidth; " + event.widths.pageWidth);
console.log("Parent's scrollLeft; " + event.widths.scrollLeft);
}}
);
});