jQuery: detecting a browser resize

Question

I am using this script from snipplr, How would I set it so the container div is 100px less than the newWindowHeight height, like -100 or something.

Answer 1

The script you found over-complicated the issue. The following worked for me:

$(function(){

    // Cache reference to our container
    var $container = $("#container");

    // A function for updating max-height
    function updateMaxHeight () {
        $container.css("max-height", $(this).height() - 100);
    }

    // Call updateMaxHeight when browser resize event fires
    $(window).on("resize", updateMaxHeight);

});

One warning is that the resize event gets called a lot when resizing the browser; it's not just called after the browser has been resized. As a result, you could have the callback function being called hundreds of times - this is generally a bad idea.

The solution would be to throttle, or debounce the event. Throttling means you won't let the callback be fired more than x times in a span of time (maybe 5 times a second). Debouncing means you fire the callback after a certain span of time has passed from the last resize event (wait until 500 milliseconds after a resize event).

jQuery doesn't presently support a throttle or debounce option, though there are plugins. Other popular libraries you may have used do have these features, such as underscore:

$(function(){

    // Cache reference to our container
    var $container = $("#container");

    // A function for updating max-height
    function updateMaxHeight () {
        $container.css("max-height", $(this).height() - 100);
    }

    // Version of updateMaxHeight that will run no more than once every 200ms
    var updateMaxHeightThrottled = _.throttle(updateMaxHeight, 200);

    // Call updateMaxHeightThrottled when browser resize event fires
    $(window).on("resize", updateMaxHeightThrottled);

});