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Automatic Canvas Resizing - Facebook SDK for JavaScript - Documentation - Meta for Developers
Automatic Canvas Resizing
This method is only enabled when Canvas Height is set to "Fixed at (800)px" in the App Dashboard.
The method FB.Canvas.setAutoGrow()
starts or stops a timer which will grow your iframe to fit the content every few milliseconds. Default timeout is 100ms.
This method was previously called FB.Canvas.setAutoResize
.
NOTE: When using this method, ensure that window.name is not overridden as that can cause issues.
Examples
This function is useful if you know your content will change size, but you don't know when. There will be a slight delay, so if you know when your content changes size, you should call setSize()
yourself (and save your user's CPU cycles).
window.fbAsyncInit = function() {
FB.init({
appId: 'YOUR_APP_ID', // App ID
});
FB.Canvas.setAutoGrow();
}
If you ever need to stop the timer, just pass false.
FB.Canvas.setAutoGrow(false);
If you want the timer to run at a different interval, you can do that too.
FB.Canvas.setAutoGrow(91); // Paul's favourite number
If there is only 1 parameter and it is a number, it is assumed to be the interval.
Parameters
Name Type Required Description onOrOff
boolean
yes
Whether to turn the timer on or off. truthy ==
on, falsy == off. default is true
interval
integer
yes
How often to resize (in ms). default is
100ms