How To Avoid Dropdown Menu To Close Menu Items On Clicking Inside

admin_img Posted By Bajarangi soft , Posted On 12-10-2020

The default behavior of a dropdown menu is to close the menu list items when clicked inside. In this article, We will use stropPropagation method to prevent the dropdown menu from closing the menu list.

Dropdown close Menu Items

stopPropagation(): The stopPropagation() method is used to stop propagation of event calling i.e. the parent event is called we can stop the propagation of calling its children by using the stopProagration() method and vice-versa.
Syntax:

event.stopPropagation();
Example:
<!DOCTYPE html>
<html>

<head>
    <title>
        How to avoid dropdown menu to close
        menu items on click inside ?
    </title>

    <style>
        .dropbutton {
            background-color: #ee4536;
            color: white;
            padding: 14px;
            font-size: 14px;
            border: none;
            cursor: pointer;
        }

        .dropbutton:hover, .dropbutton:focus {
            background-color: #d25640;
        }

        .dropdownmenu {
            position: relative;
            display: inline-block;
            outline: none;
        }

        .dropdownmenu-content {
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            min-width: 140px;
            overflow: auto;
            box-shadow: 0px 8px 16px rgba(0,0,0,0.3);
        }

        .dropdownmenu-content a {
            color: black;
            padding: 12px 14px;
            text-decoration: none;
            display: block;
        }

        .dropdownmenu a:hover {
            background-color: #f1f1f1
        }

        .show {
            display:block;
        }
    </style>
</head>

<body style="text-align:center;">

<h1 style="color:#ef530a">BAJARANGI SOFT</h1>

<p>
    Clicking outside will close
    the drop down menu.
</p>

<div class="dropdownmenu">

    <button onclick="btnToggle()" class="dropbutton">
        Dropdown
    </button>

    <div id="Dropdown" class="dropdownmenu-content" >
        <a href="#Java">Java</a>
        <a href="#HTML">HTML</a>
        <a href="#CSS">CSS</a>
        <a href="#JS">JavaScript</a>
    </div>
</div>

<script>

    // JavaScript code to avoid dropdown
    // menu close

    // Clicking dropdown button will toggle display
    function btnToggle() {
        document.getElementById("Dropdown").classList.toggle("show");
    }

    // Prevents menu from closing when clicked inside
    document.getElementById("Dropdown").addEventListener('click', function (event) {
        alert("click outside");
        event.stopPropagation();
    });

    // Closes the menu in the event of outside click
    window.onclick = function(event) {
        if (!event.target.matches('.dropbutton')) {

            var dropdowns =
                document.getElementsByClassName("dropdownmenu-content");

            var i;
            for (i = 0; i < dropdowns.length; i++) {
                var openDropdown = dropdowns[i];
                if (openDropdown.classList.contains('show')) {
                    openDropdown.classList.remove('show');
                }
            }
        }
    }
</script>
</body>

</html>
 

 

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