Contains in jQuery

Suppose you want to check whether a string contains a particular sub string  or not and want to perform other action according to this result then you can easily do that using jQuery simple code which I will show in this Blog.

 

I am explaining this using a simple e.g. where I will check whether our sting contains a particular prefix or not, if not then that prefix will be append.

$('#chatText').keyup(function ()
{
  var prefix = 'Me:';
  if (!(this.value.match('^Me:')))
  {
     this.value = prefix + this.value;
  }
});

Here I am checking the string entered in a particular textbox is having "Me:" as it's prefix or not, if not then it's appended.

 

For checking the string two main things are used. First is ".match" and Second is "^" sign. These two works together and give us the output as true or false.