+ 11

Why Its Not Work ???

var a = document.getElementById("ID"); //onclick Event Function function g() { a.style.color = "blue" } https://code.sololearn.com/WF9VacH8b5OJ/?ref=app

javascript function variable var global

23rd May 2017, 1:53 PM

Kailash Loncha

7 Antworten

+ 7

First declare( a ) as a global variable and put the document.getElementById("ID"); inside window.onload function . Like this - var a; window.onload=function(){ a=document.getElementById("ID"); } //rest of the code same function g(){ a.style.color="blue"; } Whats happening here is that JavaScript is loaded before HTML is loaded , so getting element by id can't find any object as it hasn't been loaded yet . So window.onload is an event which occurs when the HTML is fully loaded so everything works fine then.

23rd May 2017, 2:32 PM

Utkαrsh

+ 13

Change var a = document.hetElementById("ID") to var a = document.getElementById("ID") And, add semicolons.

23rd May 2017, 2:00 PM

Krishna Teja Yeluripati

+ 10

Thank You All

23rd May 2017, 2:44 PM

Kailash Loncha

+ 8

@Krishna Sir It Was a Type Mistake In My Question https://code.sololearn.com/WF9VacH8b5OJ/?ref=app

23rd May 2017, 2:08 PM

Kailash Loncha

+ 5

@utkarsh is correct. js is loaded first var a is null because it cannot find any id. use window.onload or <body onload="Load();"> ........ var a; function Load(){ a = document.getElementById("id"); }

23rd May 2017, 2:43 PM

MR Programmer