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JavaScript

addLoadEvent.js

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			if (oldonload) {
				oldonload();
			};
			func();
		}
	}
}

Description

Simon Willison's addLoadEvent allows multiple functions to be attached on window.onload. The original post is lost -- at least, I could not find it. This version was taken from http://www.htmlgoodies.com/beyond/javascript/article.php/3724571/Using-Multiple-JavaScript-Onload-Functions.htm
https://snipt.net/embed/e8282f5008c54ecdf3d0be8cb5070324/
/raw/e8282f5008c54ecdf3d0be8cb5070324/
e8282f5008c54ecdf3d0be8cb5070324
js
JavaScript
13
2019-08-23T14:15:43
True
False
False
/api/public/snipt/87897/
addloadeventjs
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="kd">function</span> <span class="nx">addLoadEvent</span><span class="p">(</span><span class="nx">func</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-2"><a name="L-2"></a> <span class="kd">var</span> <span class="nx">oldonload</span> <span class="o">=</span> <span class="nb">window</span><span class="p">.</span><span class="nx">onload</span><span class="p">;</span> </span><span id="L-3"><a name="L-3"></a> <span class="k">if</span> <span class="p">(</span><span class="k">typeof</span> <span class="nb">window</span><span class="p">.</span><span class="nx">onload</span> <span class="o">!=</span> <span class="s1">&#39;function&#39;</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-4"><a name="L-4"></a> <span class="nb">window</span><span class="p">.</span><span class="nx">onload</span> <span class="o">=</span> <span class="nx">func</span><span class="p">;</span> </span><span id="L-5"><a name="L-5"></a> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span> </span><span id="L-6"><a name="L-6"></a> <span class="nb">window</span><span class="p">.</span><span class="nx">onload</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> </span><span id="L-7"><a name="L-7"></a> <span class="k">if</span> <span class="p">(</span><span class="nx">oldonload</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-8"><a name="L-8"></a> <span class="nx">oldonload</span><span class="p">();</span> </span><span id="L-9"><a name="L-9"></a> <span class="p">};</span> </span><span id="L-10"><a name="L-10"></a> <span class="nx">func</span><span class="p">();</span> </span><span id="L-11"><a name="L-11"></a> <span class="p">}</span> </span><span id="L-12"><a name="L-12"></a> <span class="p">}</span> </span><span id="L-13"><a name="L-13"></a><span class="p">}</span> </span></pre></div> </td></tr></table>
dom, event, onload