Displaying array content in alert box

Question

This DOES WORK in other scripts I have written, but not here. Why? Other scripts I have written have been able to display the entire array, and were able to display 1-2-3 levels deep. ie Original[0] / Original[0][0] Am I missing something VERY simple?

Winning answer HERE: How can I create a two dimensional array in JavaScript? Works fine?

<html>
<head>

<script>
Original = [
[1,2,3,4,5,6,7,8,9,0],
[0,9,8,7,6,5,4,3,2,1],
[q,w,e,r,t,y,u,i,o,p],
[a,b,c,d,e,f,g,h,i,j],
];

function TestFunction(){
alert(Original);
}


</script>
</head>
<body>
<button onClick = TestFunction()>Test</button>
</body>
</html>

Richard Hamilton · Accepted Answer · 2015-10-12 20:19:49Z

3

The problem was that you have a bunch of undeclared variables. In an array, strings must be enclosed in quotation marks.

Original = [
[1,2,3,4,5,6,7,8,9,0],
[0,9,8,7,6,5,4,3,2,1],
['q','w','e','r','t','y','u','i','o','p'],
['a','b','c','d','e','f','g','h','i','j'],
];

Here is an updated fiddle

http://jsfiddle.net/4fmtqou2/

answered Oct 12, 2015 at 20:19

Richard Hamilton

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2 Comments

Ronk Over a year ago

Ahh, ok, good. I was in too big of a hurry. This was actually a prep question for the next one,.

Ronk Over a year ago

jsfiddle.net/RonK/hgtxzkrs/2 Here is more what the TOTAL problem was. But could not get even the pieces to work first.

Gergely Laborci · Accepted Answer · 2015-10-12 20:22:13Z

2

You should quote your "q","w","e" ... characters in the array.

answered Oct 12, 2015 at 20:22

Gergely Laborci

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2 Comments

Richard Hamilton Over a year ago

Yep, otherwise they are just undefined variables. Fixing this by wrapping them in quotes fixes the problem

Ronk Over a year ago

innerHTML throws out an "undefined" at this point. I wish alert would do the same... wait... Has anyone seen it? thinking back, I swear I'd seen it before.

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