Hi Kaushik,
Sometimes, you may need to call some JavaSript from within a link. Normally, when you click a link, the browser loads a new page (or refreshes the same page).
This might not always be desirable. For example, you might only want to dynamically update a form field when the user clicks a link.
To prevent the load from refreshing, you could use the JavaScript void() function and pass a parameter of 0 (zero).
Example of void(0):
We have a link that should only do something (i.e. display a message) upon two clicks (i.e. a double click). If you click once, nothing should happen. We can specify the double click code by using JavaScript's "ondblclick" method. To prevent the page reloading upon a single click, we can use "JavaScript:void(0);" within the anchor link.
Code:(Try this)
<a href="JavaScript:void(0);" ondblclick="alert('Well done!')">Double Click Me!</a>
Try without void(0) and check. It will refresh page.
