Call Javascript Function On HTML Button Click

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How To Call Javascript Function On HTML Button Click

Here we consider how to call javascript function on button click. Lets start with one example here. Suppose we have a button inside div as shown below.



Inside Srcipt region, we have declared a javascript function.

function clickEvent() {
    alert('hello!');
};



Now for calling this function on button click, we have two ways.


Method 1

In this way, we make the OnClick event inline to the HTML part.



Inside HTML button, write, onclick="clickEvent();".
Now when button is clicked, the JavaScript function will be invoked.


Method 2

Here, we can attach the js function with the HTML button inside Script region. Inside Script region, find the HTML button by its ID and attach JS function.

document.getElementById("btnClick").onclick = clickEvent;



Now when button is clicked, the JavaScript function will be invoked. That's all, by this way we can Call Javascript Function On HTML Button Click.