Posted By
Bajarangi soft ,
Posted On 12-10-2020
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();
<!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>