+ 1

Uncaught TypeError: Cannot set property 'innerHTML' of null

html code: <html> <head> <meta charset="UTF-8"> <title>DOM</title> </head> <body> <script src="dom.js"></script> <p id="dom2">This is dom</p> </body> </html> JAVASCRIPT: var code=document.getElementById("dom2"); code.innerHTML= "this is DOM"; console.log(code.innerHTML);

javascript error

28th Jul 2020, 2:15 AM

Pankaj Kumar

7 Réponses

+ 3

This is totally fine, i dont know why u r getting the error. Try putting the javascript inside <script> tags before the ending body tag. Use <scrip> without any src attribute If it works then the problem is sololearn's it loads script after DOM. You can also use window.onload = function() { // your js code here }

28th Jul 2020, 2:30 AM

maf

+ 5

This is bcz the script loads first even before the DOM loads that's why Pankaj Kumar can't set property of null (means that is not present in dom) So simple solution is to load dom first then script This can be done in these ways Use onload function and put all your script inside that like this onload = () =>{ .... } Or Place the script just above the body tag Or In JS section u can use this way //</script><script>

28th Jul 2020, 3:21 AM

Ankit Yadav

+ 3

28th Jul 2020, 3:26 AM

Kevin ★

+ 2

Pankaj Kumar just do the following and you will see it in the web view and on the console view <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>DOM</title> <script> var code=document.getElementById("dom2"); code.innerText= "this is DOM"; console.log(code.innerText);</script> </head> <body> <p id="dom2"></p> </body> </html>

28th Jul 2020, 3:03 AM

BroFar

+ 1

Put your js code just before ending body.this error occur because your js is loaded earlier than html hence js is not getting your element in variable. <body> //Code <script> //js </script> </body>

28th Jul 2020, 9:18 AM

Divya Mohan

+ 1

Javascript code's ouside the script tags

29th Jul 2020, 1:56 AM

Hansley LOVINCE

In JavaScript almost everything is an object, null and undefined are exception. if a variable has been declared, but has not been assigned a value, is automatically assigned the value undefined . Therefore, if you try to access the value of such variable, it will throw Uncaught TypeError cannot set property '0' of undefined/null . JavaScript null and undefined is one of the main reasons to produce a runtime errors . This happens because you don't check the value of unknown return variables before using it. If you are not sure a variable that will always have some value, the best practice is to check the value of variables for null or undefined before using them. The standard way to catch null and undefined simultaneously is this: if (variable == null) { // your code here. } Because null == undefined is true, the above code will catch both null and undefined. Also you can write equivalent to more explicit but less concise: if (variable === undefined variable === null) { // your code here. } This should work for any variable that is either undeclared or declared and explicitly set to null or undefined. http://net-informations.com/js/err/set.htm

9th Nov 2021, 7:11 AM

creigmalta