Skip to content

Instantly share code, notes, and snippets.

@yccheok
Created November 10, 2015 04:06
Show Gist options
  • Save yccheok/5bd3be94cb349aa0038b to your computer and use it in GitHub Desktop.
Save yccheok/5bd3be94cb349aa0038b to your computer and use it in GitHub Desktop.
<html>
<head>
<script type="text/javascript">
(function(funcName, baseObj) {
// The public function name defaults to window.docReady
// but you can pass in your own object and own function name and those will be used
// if you want to put them in a different namespace
funcName = funcName || "docReady";
baseObj = baseObj || window;
var readyList = [];
var readyFired = false;
var readyEventHandlersInstalled = false;
// call this when the document is ready
// this function protects itself against being called more than once
function ready() {
if (!readyFired) {
// this must be set to true before we start calling callbacks
readyFired = true;
for (var i = 0; i < readyList.length; i++) {
// if a callback here happens to add new ready handlers,
// the docReady() function will see that it already fired
// and will schedule the callback to run right after
// this event loop finishes so all handlers will still execute
// in order and no new ones will be added to the readyList
// while we are processing the list
readyList[i].fn.call(window, readyList[i].ctx);
}
// allow any closures held by these functions to free
readyList = [];
}
}
function readyStateChange() {
if ( document.readyState === "complete" ) {
ready();
}
}
// This is the one public interface
// docReady(fn, context);
// the context argument is optional - if present, it will be passed
// as an argument to the callback
baseObj[funcName] = function(callback, context) {
// if ready has already fired, then just schedule the callback
// to fire asynchronously, but right away
if (readyFired) {
setTimeout(function() {callback(context);}, 1);
return;
} else {
// add the function and context to the list
readyList.push({fn: callback, ctx: context});
}
// if document already ready to go, schedule the ready function to run
if (document.readyState === "complete") {
setTimeout(ready, 1);
} else if (!readyEventHandlersInstalled) {
// otherwise if we don't have event handlers installed, install them
if (document.addEventListener) {
// first choice is DOMContentLoaded event
document.addEventListener("DOMContentLoaded", ready, false);
// backup is window load event
window.addEventListener("load", ready, false);
} else {
// must be IE
document.attachEvent("onreadystatechange", readyStateChange);
window.attachEvent("onload", ready);
}
readyEventHandlersInstalled = true;
}
}
})("docReady", window);
// Fake jquery.
var jQuery = function() {
return {
ready: function(baseObj) {
docReady(baseObj);
}
}
};
</script>
</head>
<body>
<!-- Old code by designer -->
<script type="text/javascript">
jQuery(document).ready(function() {
alert('hi');
var img = $("<img>");
img.attr("src", "http://www.sam-media.com/images/logo.png");
img.appendTo("#pixel_via_javascript");
});
</script>
<div id="pixel_via_javascript"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</body>
</html>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment