'How to get elements of specific class starting with a given string?

I have a list of elements that have multiple classes, for example:

<input class="etape btn-info others">
<input class="etape btn-inverse others">
<input class="etape btn-danger others">

How to write jQuery-code that will allow me the following...

$(".etape").click(function(){
   $(this).get("the class that starts with btn-")
   // in order to store this value in a variable to reuse it later 
});
jqueryhtmlcsstwitter-bootstrap


Solution 1:[1]

You can use Regular Expression or split the class name.

$(".etape").click(function(){
   var classes = $.grep(this.className.split(" "), function(v, i){
       return v.indexOf('btn') === 0;
   }).join();
});

http://jsfiddle.net/LQPh6/

Solution 2:[2]

You can also try:

$(".etape").click(function () {
    var theClass = $(this).attr("class").match(/btn[\w-]*\b/);
    console.log(theClass); 
});

Uses match instead of grep...

Solution 3:[3]

 // Only select input which have class 
 $('input[class]').click(function(){  
   var myClass;
   // classNames will contain all applied classes
   var classNames = $(this).attr('class').split(/\s+/);  

     // iterate over all class  
     $.each(classNames, function(index, item) {
        // Find class that starts with btn-
        if(item.indexOf("btn-") == 0){
          // Store it
          myClass = item;
        }
     });

  });

Live Demo

Solution 4:[4]

It would probably be better to store those values in the data attribute: 

<input class="etape others" data-btntype="info">
<input class="etape others" data-btntype="inverse">
<input class="etape others" data-btntype="danger">

Then:

 $(".etape").click(function(){
     var myBtnType = $(this).data('btntype');
 });

jsFiddle

Solution 5:[5]

You could just make btn its own class. However, this will work.

$("div[class^='btn-']")

Solution 6:[6]

Try this: $('input[class*='btn']').attr("class");

Solution 7:[7]

I just made @Vohuman 's function to reusable one :

// getClassStartsWith(classes,startswith);
// Example : getClassStartsWith( 'item w-2 h-4 hello' , 'h-' );
function getClassStartsWith(t,n){var r=$.grep(t.split(" "),function(t,r){return 0===t.indexOf(n)}).join();return r||!1}

Example...

HTML :

<div class="item w-2 h-4 hello"></div>

JS :

var $element = $('.item');
var classes = $element[0].className;
var getHeight = getClassStartsWith(classes,'h-');

That will return h-4, And if no class starts with h- will return false

Demo : http://jsbin.com/mijujunaca/edit?js,console

Solution 8:[8]

How about this? http://api.jquery.com/attribute-contains-word-selector/

$('input[class~="btn-"]')

Solution 9:[9]

A class starting with btn and which can not be the first class:

Working fiddle: http://jsfiddle.net/c9Tdx/

$("input[class^='btn'],input[class*=' btn']").each(function(){
     //whatever
});

Solution 10:[10]

Try this,

if($(selector).attr("class").lastIndexOf("classToStartFrom") == 0)
   return "this selector class name starts with 'classToStartFrom'";
else
   return "this selector class name doesn't start with 'classToStartFrom'";

The code is not tested.

Solution 11:[11]

This function can get Class, ID, Data and all kind of attributes using regex

$.fn.Get_Attr_Regex = function(Pattern,Type) 
{
    Type = Type || 'class';
    var List_Str = this.attr(Type);

    if(typeof List_Str !== typeof undefined && List_Str !== false) 
    {
        var regex = new RegExp(Pattern, "g");
        var List_Array = List_Str.split(" ");
        for(var i = 0; i < List_Array.length; i++)
        {
            if(regex.test(List_Array[i]))
            {
                return List_Array[i];
            }
        }
    }
    return false;
};

To use it 

$('.T_Header').Get_Attr_Regex('btn.*','class'); // => return class value which start with btnxxx

or

$('.T_Header').Get_Attr_Regex('btn.*','id');  // => return id value which start with btnxxx

or

$('.T_Header').Get_Attr_Regex('btn.*','data-info'); // => return data attribute value which start with btnxxx

Solution 12:[12]

In case someone want it to achieve on page load instead of clicking the element, use following code:

var classes = '';
jQuery(".etape").each(function() {
    classes += $.grep(this.className.split(" "), function(v, i) {
        return v.indexOf('btn') === 0;
    }).join() + '|';
});
console.log(classes);

Replace "|" with other symbol that you want to join the class names with.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Marc Audet
Solution 3
Solution 4 Marcus
Solution 5 Eric Goncalves
Solution 6
Solution 7 l2aelba
Solution 8 FibreFoX
Solution 9 Alvaro
Solution 10
Solution 11
Solution 12 Usman Ahmed

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