Problem with Javascript function

Hi . I made a function in Javascript but i always get a bug . Can you say the problem with my function? Here's the function: function general() { a.style.border = 2px solid red ; a.style.color = "green" ; }

javascript functions

29th Jul 2025, 9:45 AM

Seyyed Abbas Hosseini

6 ответов

+ 3

Is variable 'a' declared? U might want to find it using a selector query. Also i am pretty sure the 2px solid red line should be in quotes.

29th Jul 2025, 9:48 AM

Aleksei Radchenkov

Yes the variable is declared. Yeah sorry i forgot quotes . But anyways i still see a bug

29th Jul 2025, 11:33 AM

Seyyed Abbas Hosseini

Seyyed Abbas Hosseini can u provide more info then? Like an error message or full code?

29th Jul 2025, 11:53 AM

Aleksei Radchenkov

Lemme send you the error message: Uncaught TypeError : Cannot read properties of null ( reading 'style' )

29th Jul 2025, 11:58 AM

Seyyed Abbas Hosseini

in Sololearn, if you're writing the javascript code in the js tab, you have to make sure the html is loaded first. if you just directly try to get a dom element, you will get a null error because the js is executed before the html is loaded. in the js tab, put your code inside an onload function. onload = ()=>{ // your code here }

29th Jul 2025, 1:04 PM

Bob_Li

or just put your js in the html tab, before the bottom of the body tags. <html> <head> </head> <body>  <script> // your js code here </script> </body> </html>

29th Jul 2025, 1:08 PM

Bob_Li