Skip to content
Related Articles

Related Articles

How to select/deselect multiple options in dropdown using jQuery ?
  • Last Updated : 09 Feb, 2021

To select and deselect multiple options in a drop-down menu, we will use the HTML and CSS codes. HTML code helps to define the basic structure of the webpage and CSS will benefit in designing the web page.

Some essential properties used in the code are as follows-

  • <div> – This is a division tag that helps us to define a particular section of the HTML code to be referred to and can be edited easily later in the CSS style sheet.
  • <link rel=”stylesheet” href=”> – This tag contains the link of the CSS style sheet created by us and inherits all the modifications from the stylesheet which we want to make in our webpage.
  • container-fluid – This class provides a full-width container that extends through the website.
  • <div class=”row”> -This is a bootstraps grid system and helps us to fill up to 12 rows across a page.
  • mul-select – This class allows us to choose from the various options enlisted in the drop-down menu.

Approach: This is a simple HTML code to display a drop-down menu in a website where we can select multiple data-structures options and deselect others using the multi-select option.

Example:

HTML




<!DOCTYPE html>
<html lang="en">
  
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content=
        "width=device-width, initial-scale=1.0">
  
    <!-- These are the jQuery extensions taken from 
        bootstrap website to enable the drop down 
        function of the menu bar -->
    <link rel="stylesheet" href=
  
    <script src=
    </script>
  
    <script src=
    </script>
  
    <!-- Default bootstrap CSS link taken from the 
        bootstrap website-->
    <link rel="stylesheet" href=
  
    <script src=
    </script>
  
    <style>
        .mul-select {
            width: 160%;
        }
          
        h1 {
            color: green;
        }
    </style>
</head>
  
<body>
    <div class="container-fluid h-300 bg-dark">
        <div class="row justify-content-center align-items-center">
            <h1>Select Options</h1>
        </div>
        <br>
  
        <!-- These modifications are done to make the webpage 
            adpative to the screen size and automatically 
            reduce the size when screen is minimized -->
        <div class="row justify-content-center align-items-center h-100">
            <div class="col col-sm-6 col-md-6 col-lg-4 col-xl-3">
                <div class="form-group">
  
                    <!-- Various options in drop down menu to
                        select the types of data structures 
                        that we need -->
                    <select class="mul-select" multiple="true">
                          <option value="Stack">Stack</option>
                          <option value="Queue">Queue</option>
                          <option value="Linked-List">Linked-List</option>
                          <option value="Heap">Heap</option>
                          <option value="Binary-Tree">Binary-Tree</option>
                          <option value="Graph">Graph</option>
                          <option value="Array">Array</option>
                      </select>
                </div>
            </div>
        </div>
    </div>
  
    <!-- JavaScript code to enable the drop down function -->
    <script>
        $(document).ready(function() {
            $(".mul-select").select2({
                placeholder: "select data-structures",
                tags: true,
            });
        })
    </script>
</body>
  
</html>

In the HTML code, we have also included some JavaScript codes because in a webpage any type of function to be performed that we have to use JavaScript.



As we can see on opening the file in a browser this is the output obtained and we are getting the desired drop down bar

This shows that we are able to select multiple options at a single time just by clicking on them. Apart from that we can also observe that all the options which are chosen have been shaded as grey.

To un select the selected options- we can simply click on the cross button near the text and the option will be automatically un selected and also the grey shade in the drop down menu has been removed

Source to download the bootstrap,css and JavaScript extensions- https://getbootstrap.com/docs/4.5/getting-started/introduction/

full-stack-img

My Personal Notes arrow_drop_up
Recommended Articles
Page :