Equivalent of ASP's .Contains method

JavascriptJqueryString

Javascript Problem Overview

> Possible Duplicate:
> JavaScript: string contains
> Jquery: How to see if string contains substring

In ASP .NET C# I use:

string aa = "aa bb";
if (aa.Contains("aa"))
   { 
       //Some task       
   }

I want to same thing in client side means in JQuery. Something like below:

var aa = "aa bb";
if(aa. -----want help here){
}

Is there any method to do this?

Javascript Solutions

Solution 1 - Javascript

Use the String.indexOf() MDN Docs method

if( aa.indexOf('aa') != -1 ){
// do whatever
}

Update

Since ES6, there is a String.includes() MDN Docs so you can do

if( aa.includes('aa') ){
// do whatever
}

Solution 2 - Javascript

You don't need jQuery for this. It can be achieved with simple pure JavaScript:

var aa = "aa bb";
if(aa.indexOf("aa") >= 0){
   //some task
}

The method indexOf will return the first index of the given substring in the string, or -1 if such substring does not exist.

Solution 3 - Javascript

C#'s implementation of .Contains is actually a wrapper on it's implementation of .IndexOf. Therefore you can create your own .Contains function in javascript like this:

String.prototype.Contains = function (s) {
    return this.indexOf(s) != -1;
}

Solution 4 - Javascript

In Javascript you use indexOf for that.

 var aa = "aa bb";
 if(aa.indexOf('aa') != -1)
 {
 }

> But remember that indexOf is case sensitive.

you can create your own contains method using prototype that can, if you want, handle that.

String.prototype.contains = function(value, ignorecase) {
    if (ignorecase) {
        return (this.toLowerCase().indexOf(value.toString().toLowerCase()) != -1);
    }
    else {
        return this.indexOf(value) != -1;
    }
};

alert("aa bb".contains("aa"))

Source: 'contains' method in javascript, extend the String prototype and add your own methods.

Solution 5 - Javascript

You can use a regular expression for more complex scenarios, or indexOf for simple ones.

if (aa.match(/a(b|c)a/)) {
}

or

if (aa.indexOf('aa') >= 0) {
}

Solution 6 - Javascript

Since Java 5, contains() also exists and can be used the same way.

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