How to check if an element exists in jQuery?
When we use dynamic elements in jQuery then sometimes you should check whether elements exits or not before performing a certain action on that element. In such cases, you can use jQuery .length property to determine if your selector matched anything in the webpage.
if ( $( "#idDiv" ).length ) {
alert("idDiv exists!!");
}else{
alert("Does not exists!!");
}
<Div id="idDiv">Div selector with ID</div>

Div selector with ID
Div selector with Class
<html>
<head>
<title>jQuery if exists example</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("#bt1").click(function(){
if ( $( "#idDiv" ).length ) {
alert("idDiv exists!!");
}else{
alert("Does not exists!!");
}
});
$("#bt2").click(function(){
if ( $( ".classDiv" ).length ) {
alert("classDiv exists!!");
}else{
alert("Does not exists!!");
}
});
});
</script>
</head>
<body>
<Div id="idDiv">Div selector with ID</div>
<button id="bt1">Test ID Selector</button><br>
<Div class="classDiv">Div selector with Class</div>
<button id="bt2">Test Class Selector</button>
</body>
</html>
jQuery show() method
In jQuery , it isn't always necessary to test whether an element exists or not . The following code will show the element if it exists, and do nothing (with no errors) if it does not exists.
$("#idDiv" ).show();
Javascript
In JavaScript, you can use the following JavaScript to test whether an element exists or not.
if(document.getElementById("show()") !== null)
{
//code
}
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