[Nazir]

Although string comparition allows you to find identical strings, it's sometimes more useful to check if a piece of text is part of a larger string, and to know exactly where that text is located within the string.

We can find a particular piece of text within a string using JavaScrip's indexOf method. This method takes one argument, the text you want to find and returns the index of that text:

var a = "This sentance contains a substring.";
var b = a.indexOf("sentance");

The value of the variable b is now 5.

String index numbering starts at 0, so although the text "sentance" starts on the sixth character, it's index will be 5.

If the text you're searching for doesn't occur in the string, the method will return an index of -1.

[mr.smith]

thanks Nazir, i know about this funtion and i have a javascript book in which i have read about it and some other functions, wel this function is really helpful and we can use it on our application .

[Lucid_Seeker]

This stuff is fairly basic Javascript, i could post loads of tutorials on Javascipt but don't because it would take hours of my time, plus i wouldn't get paid