js check if button xists code example

Example 1: js check if dom element exists

var myElement = document.getElementById("myElementID");

if(!myElement){
    //#myElementID element DOES NOT exist
}

if(myElement){
    //#myElementID element DOES exists
}

Example 2: button not exist js

<div id="test">Example DIV element.</div>
 
<script>
    //Attempt to get the element using document.getElementById
    var element = document.getElementById("test");
 
    //If it isn't "undefined" and it isn't "null", then it exists.
    if(typeof(element) != 'undefined' && element != null){
        alert('Element exists!');
    } else{
        alert('Element does not exist!');
    }
</script>