Uncaught TypeError: Cannot read property 'value' of null Line: 1

<html> <head> <title>Page Title</title> </head> <body> <input type="text" name ="arguments" value="[[1,2,3,4],[1,2,3]]" id="aaa"/> <input type="button" value="Get Symmetric Diff" onClick="sym()" /> </body> </html> JS: var userInput = document.getElementById('aaa').value; function sym() { alert(userInput); }

html javascript input

31st Dec 2016, 3:20 PM

ONLY JS PLEASE!

4 odpowiedzi

+ 2

Where is the script tag included here? It looks to me like the script is running before the document has finished loading. For best results you should include your script at the very end of the body tag.

31st Dec 2016, 3:26 PM

James Durand