+ 2

Why doesn't javascript work?

When I try to run JavaScript that includes DOM (specifically) in the JavaScript console here on sololearn it doesn't work unless I type in <script> tags in html side. it always says "Cannot return value of null" is there anything I'm doing wrong?

html css javascript console web help

3rd Apr 2018, 3:54 PM

Richard Cofie

9 Answers

+ 4

It's because your Javascript code runs before your html is ready/parsed. Put your javascript code in js tab on sololearn between onload like below it should run fine <html>.. <p >this is p</p> .. </html>... //JS tab on sololearn this.onload = function(){ var p = document.querySelector('p') p.innerText = "This text was added with javascript! Hail Javscript!" }

4th Apr 2018, 5:54 PM

Lord Krishna

+ 2

Yeah, you‘re trying to Return a value of null ;) How and what are you exactly doing?

3rd Apr 2018, 4:11 PM

Jeff Block

+ 2

e.g. HTML ----- ... <div id="d"></div> ... JS ------ var elem = document.getElementEyId("d"); elem.innerHTML = "example"; 👆 Doesn't work But 👇 HTML ONLY -- ... <div id="d"></div> ... <script> var elem = document.getElementEyId("d"); elem.innerHTML = "example"; </script>

3rd Apr 2018, 7:11 PM

Richard Cofie

+ 2

I understand that and all with the tags and sometimes external with src... but I'm talking about here on sololearn in th js console

3rd Apr 2018, 7:39 PM

Richard Cofie

+ 2

then how can I ensure that it runs after the html has run? Should I only write in the script tags in the html side or is there something I need to specify in the code?

4th Apr 2018, 10:05 AM

Richard Cofie