What is the best way to access elements of a certain class that begin with a specific string?

Question

What is the best way to access elements of a certain class that begin with a specific string?

Here's the scenario: I have a group of elements that each have multiple classes assigned to them. Take a look at this example:

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

I'm looking for a way to write jQuery code that will help me achieve the following task...

$(".etape").click(function(){
   $(this).get("the class that starts with btn-")
   // and then save this value in a variable for later use
});

jquery html css twitter-bootstrap

Answer 1

Answer №1

You have the option to either utilize Regular Expression or split the class name using the split method.

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

Visit this JSFiddle link for more information

Answer 2

You have the option to either utilize Regular Expression or split the class name using the split method.

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

Visit this JSFiddle link for more information

Answer 3

Answer №2

Another option to consider:

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

Opting for match over grep...

Answer 4

Another option to consider:

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

Opting for match over grep...

Answer 5

Answer №3

 // Selecting only inputs with a class
 $('input[class]').click(function(){  
   var myClass;
   // Storing all applied classes in classNames
   var classNames = $(this).attr('class').split(/\s+/);  

     // Looping through each class  
     $.each(classNames, function(index, item) {
        // Checking for classes that start with btn-
        if(item.indexOf("btn-") == 0){
          // Saving the class
          myClass = item;
        }
     });

  });

Live Demo

Answer 6

 // Selecting only inputs with a class
 $('input[class]').click(function(){  
   var myClass;
   // Storing all applied classes in classNames
   var classNames = $(this).attr('class').split(/\s+/);  

     // Looping through each class  
     $.each(classNames, function(index, item) {
        // Checking for classes that start with btn-
        if(item.indexOf("btn-") == 0){
          // Saving the class
          myClass = item;
        }
     });

  });

Live Demo

Answer 7

Answer №4

Storing those values in the data attribute would be a more efficient approach:

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

Afterwards:

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

View demo on jsFiddle

Answer 8

Storing those values in the data attribute would be a more efficient approach:

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

Afterwards:

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

View demo on jsFiddle

Answer 9

Answer №5

One option could be to create a separate class for btn. Nonetheless, the following code will also achieve the desired outcome.

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

Answer 10

One option could be to create a separate class for btn. Nonetheless, the following code will also achieve the desired outcome.

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

Answer 11

Answer №6

Check out this code snippet:

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

Answer 12

Check out this code snippet:

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

Answer 13

Answer №7

I have successfully optimized @Vohuman's function to make it reusable:

// 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
}

For 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-');

This will output h-4. If no class starts with h-, it will return false

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

Answer 14

I have successfully optimized @Vohuman's function to make it reusable:

// 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
}

For 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-');

This will output h-4. If no class starts with h-, it will return false

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

Answer 15

Answer №8

This handy function utilizes regular expressions to retrieve Class, ID, Data, and various other attributes.

$.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'); // => returns the class value starting with btnxxx

or

$('.T_Header').Get_Attr_Regex('btn.*','id');  // => returns the id value starting with btnxxx

or

$('.T_Header').Get_Attr_Regex('btn.*','data-info'); // => returns the data attribute value starting with btnxxx

Answer 16

This handy function utilizes regular expressions to retrieve Class, ID, Data, and various other attributes.

$.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'); // => returns the class value starting with btnxxx

or

$('.T_Header').Get_Attr_Regex('btn.*','id');  // => returns the id value starting with btnxxx

or

$('.T_Header').Get_Attr_Regex('btn.*','data-info'); // => returns the data attribute value starting with btnxxx

Answer 17

Answer №9

What do you think of this suggestion? http://api.jquery.com/attribute-contains-word-selector/

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

Answer 18

What do you think of this suggestion? http://api.jquery.com/attribute-contains-word-selector/

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

Answer 19

Answer №10

Consider a CSS class that begins with btn and is not the first specified class:

Here is a working example: http://jsfiddle.net/c9Tdx/

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

Answer 20

Consider a CSS class that begins with btn and is not the first specified class:

Here is a working example: http://jsfiddle.net/c9Tdx/

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

Answer 21

Answer №11

Give this a shot,

Check if the selector class name starts with 'classToStartFrom':

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'";

Note that the code has not been tested.

Answer 22

Give this a shot,

Check if the selector class name starts with 'classToStartFrom':

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'";

Note that the code has not been tested.

Answer 23

Answer №12

If you prefer to achieve this on page load rather than clicking the element, you can utilize the code provided below:

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

You can replace "|" with any other symbol that you would like to use for joining the class names.

Answer 24

If you prefer to achieve this on page load rather than clicking the element, you can utilize the code provided below:

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

You can replace "|" with any other symbol that you would like to use for joining the class names.

What is the best way to access elements of a certain class that begin with a specific string?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

Answer №10

Answer №11

Answer №12

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