In my JavaScript I want to check whether the element with specific id is exist or not, I tried it with 2 ways
1).
var myEle = document.getElementById("myElement");
if(myEle == null){
var myEleValue= document.getElementById("myElement").value;
}
2).
if(getElementById("myElement")){
var myEleValue= document.getElementById("myElement").value;
}
but it gives same error as below -
Object expected
var myEle = document.getElementById("myElement");
if(myEle){
var myEleValue= myEle.value;
}
the return of getElementById is null if an element is not actually present inside the dom, so your if statement will fail, because null is considered a false value
You can simply use if(yourElement)
var a = document.getElementById("elemA");
var b = document.getElementById("elemB");
if(a)
console.log("elemA exists");
else
console.log("elemA does not exist");
if(b)
console.log("elemB exists");
else
console.log("elemB does not exist");<div id="elemA"></div>getElementById
Return Value: An Element Object, representing an element with the specified ID. Returns null if no elements with the specified ID exists see: https://www.w3schools.com/jsref/met_document_getelementbyid.asp
Truthy vs Falsy
In JavaScript, a truthy value is a value that is considered true when evaluated in a Boolean context. All values are truthy unless they are defined as falsy (i.e., except for false, 0, "", null, undefined, and NaN). see: https://developer.mozilla.org/en-US/docs/Glossary/Truthy
When the dom element is not found in the document it will return null. null is a Falsy and can be used as boolean expression in the if statement.
var myElement = document.getElementById("myElement");
if(myElement){
// Element exists
}