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Javascript Functions

Functions are segments of your script that do not run until they are called to execute in your document. They can be executed by HTML events or Javascript events, and they will only run when that event fires off. The various examples below lend good insight into the aspects of function creation.

Any user initiated event can make your function run

<script type="text/javascript">
function myFunction(){
    var status = document.getElementById("status");
    status.innerHTML = "You just made my function run.";
<p><input type="button" value="Click Me" onclick="myFunction()"></p>
<h3 id="status"></h3>


An event of the window or document can make your function run

<script type="text/javascript">
function myFunction(){
    var status = document.getElementById("status");
    status.innerHTML = "The page finishing loading made my function run.";
window.onload = myFunction;
<h3 id="status"></h3>


Make your functions more powerful by adding arguments

Arguments are an aspect of function creation that make your functions much more dynamic, useful and reusable. You can apply one or more arguments to your functions, if applying multiple arguments be sure to separate each by a comma.

<script type="text/javascript">
function myFunction(v1,v2,v3){
    var status = document.getElementById("status");
    status.innerHTML = v2+" has known "+v1+" for "+v3+" years.";
<p><input type="button" value="Click Me" onclick="myFunction('Joe','Ben',7)"></p>
<h3 id="status"></h3>


Javascript does not require an event necessarily in order to run a function

function myFunction(){
    alert("Function called to run by Javascript");
myFunction(); // calls the function run


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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at