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sorting a list of decimal numbers in a textarea

Posted on 2004-09-28
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Last Modified: 2006-11-17
Hi!
I want to display a text area and have the user input a series of numbers of value less than one( ie .0129) When a button is pressed, a function will return the sorted list to the textarea. Can this be done? I know javascript has a sort() function that works on an array, but how do you get the lines of the text area into an array?
Thanks,
Annas
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Question by:annas
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4 Comments
 
LVL 12

Expert Comment

by:monosodiumg
ID: 12168536
If you can get the user to separate the values using a delimiter string e.g. "," or " " then you can get them into an array like this:
var sNumbers = MyTextArea.value
var aNumbers = sNumbers.split(",")

Now you can sort your array. Be aware the the default compare function used by the sort method  will sort in alphabetical order, which works if all your numbers start with a  decimal point but not otherwise. E.g. 11 comes before 2 because "11" is before "2".
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LVL 63

Accepted Solution

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Zvonko earned 400 total points
ID: 12169688
How about this:

<html>
<head>
<title>Q_21147659</title>
<script>
function sortArea(theBtn){
  theArea = theBtn.form.userInput;
  theArea.value = theArea.value.split("\r\n").sort(num).join("\n");
}
function num(a, b){
  a*=1; b*=1;
  if(a>b) return 1;
  if(a<b) return -1;
  return 0;
}
</script>
</head>
<body>
<form>
<textarea name="userInput" rows="20"" cols="80">
</textarea>
<input type=button value="Sort" onClick="sortArea(this)">
</form>
<body>
</html>

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Author Comment

by:annas
ID: 12172288
Thanks, Zvonko, your code worked perfectly!
Annas
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LVL 63

Expert Comment

by:Zvonko
ID: 12172307
You are welcome.
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