andreni78
asked on
Javascript code to generate a random number
Requirements:
1. Scripts must work with NS4+, IE4+ and AOL most popular versions
2. When click a button name "Code Gen", it will generate a random code base on the below formular, then populate the text box with the new code, re-click "Code Gen" button will regenerate and replace the text box with the new random code.
The text box name is: name="rqaRedemptionCode"
3. Formular:
[Year Code + Month Code + Date] - [random 4 digit number]
Year Code = A to J (A=0 to J=9, if year end with 0 then A, current year is: 5 or F)
Month Code = B to M (B=1 to M=12, current month is May, then F)
Date = actual date (1 to 31)
random 4 digit number=any popular method of produce 4 digit random number
For example: today date is 2005, 5,15
example code is: FF15-5624
4. Please provide a ready to use code with html for testing.
Thanks, Maximum 500 as always.
1. Scripts must work with NS4+, IE4+ and AOL most popular versions
2. When click a button name "Code Gen", it will generate a random code base on the below formular, then populate the text box with the new code, re-click "Code Gen" button will regenerate and replace the text box with the new random code.
The text box name is: name="rqaRedemptionCode"
3. Formular:
[Year Code + Month Code + Date] - [random 4 digit number]
Year Code = A to J (A=0 to J=9, if year end with 0 then A, current year is: 5 or F)
Month Code = B to M (B=1 to M=12, current month is May, then F)
Date = actual date (1 to 31)
random 4 digit number=any popular method of produce 4 digit random number
For example: today date is 2005, 5,15
example code is: FF15-5624
4. Please provide a ready to use code with html for testing.
Thanks, Maximum 500 as always.
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Hi!~ Batalf
just curious, I have seen you put d.getMonth()/1 not only one time...
I have tested d.getMonth() is a Number type(I only test in IE6 and firefox), what is the significant to divide by one?
just curious, I have seen you put d.getMonth()/1 not only one time...
I have tested d.getMonth() is a Number type(I only test in IE6 and firefox), what is the significant to divide by one?
Hi william007,
It's because Javascript uses '+' both to concatinate strings and to add numbers, and because it doesn't fully support primitive variable types.
So I perform an arithmetic operation on the numbers to get the values added instead of concatinated. After checking, it doesn't look like it's needed in this example, but I have found it to be a good habit to always do it this way.
Example that illustrates it:
<script type="text/javascript">
var variable1 = '100';
alert(variable1 + 5); // Alerts 1005
alert(variable1/1 + 5); // Alerts 105
</script>
Batalf
It's because Javascript uses '+' both to concatinate strings and to add numbers, and because it doesn't fully support primitive variable types.
So I perform an arithmetic operation on the numbers to get the values added instead of concatinated. After checking, it doesn't look like it's needed in this example, but I have found it to be a good habit to always do it this way.
Example that illustrates it:
<script type="text/javascript">
var variable1 = '100';
alert(variable1 + 5); // Alerts 1005
alert(variable1/1 + 5); // Alerts 105
</script>
Batalf
Oic, is for "security purpose":-)
ASKER
Hi Batalf,
Thank you for the superfast response. It works perfectly.
Thank you for the superfast response. It works perfectly.
Glad I could help!
Batalf
Batalf
You can change the name in the function from
document.myForm.codeField.
to
document.myForm.rqaRedempt
and the text field in the form from
<input type="text" name="codeField">
to
<input type="text" name="rqaRedemptionCode">
Batalf