Bug Tracker

Ticket #6781: resourceLoading.html
File resourceLoading.html, 2.4 KB (added by jrburke, July 09, 2010 08:54PM UTC)

Test file indicating how the property would work with dynamic event notification

<!DOCTYPE html>
<html>
<head>
    <title>Resource Loading event/property test</title>
    <script>
        "use strict";

        //Set up the (expando) property
        if (!("resourceLoading" in document.documentElement)) {
            document.documentElement.resourceLoading = 0;
        }

        function modify(value) {
            //modify the value
            document.documentElement.resourceLoading = value;

            //Notify listeners.
            //No attachEvent branch since in IE modifying the expando triggers
            //onpropertychange
            if (document.addEventListener) {
                var evt = document.createEvent("UIEvents");
                evt.initEvent("documentElementResourceLoading", false, false);
                document.dispatchEvent(evt);
            }
        }

        function listen(callback) {
            if (document.addEventListener) {
                document.addEventListener("documentElementResourceLoading", function (evt) {
                    callback(document.documentElement.resourceLoading);
                }, false);
            } else if (document.attachEvent) {
                document.documentElement.attachEvent("onpropertychange", function (evt) {
                    if (evt.propertyName === "resourceLoading") {
                        callback(document.documentElement.resourceLoading);
                    }
                });
            }
        }

        function increment() {
            modify(document.documentElement.resourceLoading + 1);
        }
        function decrement() {
            modify(document.documentElement.resourceLoading - 1);
        }

        function msg(message) {
            document.getElementById("output").innerHTML += '<br>' + message;
        }

        increment();
        increment();

        listen(function (value) {
            msg('resourceLoading is now: ' + value);
        });

    </script>
</head>
<body>
    <h1>Resource Loading event/property test</h1>
    <button onclick="increment()">Increment</button>
    <button onclick="decrement()">Decrement</button>
    <button onclick="msg('resourceLoading current value: ' + document.documentElement.resourceLoading)">Current Value</button>
    <button onclick="msg('Is resourceLoading in documentElement: ' + ('resourceLoading' in document.documentElement))">resourceLoading in document.documentElement</button>
    <div id="output"></div>
</body>
</html>

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