Call javascript in body tag on different events

JavaScript functions can be automatically invoked on different events by registering them with body tag.

JavaScript can be called inside <body> tag of a web page. Mainly JavaScript functions are called on events like Loading a web page, Clicking on a button, Moving mouse, Focusing on an element, etc. For each of these events, there are defined methods and they are fired at that particular event.

For example; onclick() is triggered on a mouse click event while onmouseover() is called when mouse moves over an element. But you can call JavaScript functions even without any event.

Available events for body tag are...

  • ONCLICK : mouse button clicked
  • ONDBLCLICK : mouse button double-clicked
  • ONMOUSEDOWN : mouse button is pressed
  • ONMOUSEOVER : mouse moved onto an element
  • ONMOUSEMOVE : mouse moved over an element
  • ONMOUSEOUT : mouse moved out of an element
  • ONMOUSEUP : mouse button is released
  • ONKEYPRESS : key pressed and released
  • ONKEYDOWN : key pressed
  • ONKEYUP : key released
There are two special events that are specific to <body> tag. Those are;
  • ONLOAD : document loaded completely
  • ONUNLOAD : document unloaded

Calling a JavaScript method

At any of the above events, you can call any JavaScript function from your <body> tag. A JavaScript function named testAlert() can be called as below.
<body onload="testAlert();">

To call move than one JavaScript function, you have to write the function names separated by semi-colons ( ; ) as below.
<body onload="validate(); calculate(); submit();">

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Digizol: Call javascript in body tag on different events
Call javascript in body tag on different events
JavaScript functions can be automatically invoked on different events by registering them with body tag.
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