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| Special Edition Using HTML 4 (6th Edition) (ISBN: 0789722674) |
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List Price: $39.99
Our Price: $27.99
Used Price: $4.94
Release Date: 22 December, 1999
Manufacturer: Que (Paperback)
Sales Rank: 20,652
Author: Molly E. Holzschlag
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More Info
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JavaScript Random Number Generator
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2003-05-27 16:47:35
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html
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Category: source:html:javascript
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Description: Generate random numbers, round them to the nearest integer and print them in a select list.
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Platform: all
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Author: detour
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Viewed: 20718
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Rating: 3.8/5 (93 votes)
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| If you have any questions about
this piece of code or still need help, try posting your question on the forum. |
<!-- random.js by detour@metalshell.com -->
<!-- Generate 100 random numbers, round and print them. -->
<!-- http://www.metalshell.com/ -->
<html>
<head>
<title>JavaScript Random Number Generator.</title>
</head>
<body>
<script type="text/javascript">
// Generate 100 random numbers and insert them into listbox
function genNumbers(listbox) {
var i, rannum;
for(i = 0; i < 100; i++) {
// Math.random() returns a decimal number between
// 0 and 1. You multiple the result by the range
// of numbers you want.
// This will generate 0-100.
rannum = Math.random()*100;
// This would generate 145-200
// rannum = Math.random()*55 + 145;
// rannum is now a decimal value, to turn it into
// an integer use Math.round to round it to the nearest
// integer. Math.floor(rannum) to always round down and
// Math.ceil(rannum) to round up.
rannum = Math.round(rannum);
// If options[i] hasn't been created yet, create it.
if(listbox.options[i] == null) {
listbox.options[i] = new Option( rannum, rannum, 0, 0 );
} else {
listbox.options[i].value = rannum;
listbox.options[i].text = rannum;
}
}
}
</script>
<form>
<select name="ranlist" size="20" style="width:200px">
</select><br><br>
<input type="button" value="Generate Numbers"
onclick="genNumbers(this.form.ranlist)";>
</form>
</body>
</html>
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