javascript IF on radio button value

@smares32371: not sure if you need this advice, but i would suggest that you go for a drop-down rather than radio buttons for this one. In this way, all you need to do is, check the value of one field.

Let me know if you code base for this.
Please no points for this comment of mine, since if @leak's reply works, he deserve all points :)

leakim971: ok its working how do i validate the rest of the credit card fields, there is like 10 more

DON'T do credit card validation only on the client side !!

Some links :
http://javascript.internet.com/forms/val-credit-card.html
https://www.experts-exchange.com/questions/21685834/Credit-Card-Number-Validation.html
http://tinyurl.com/4b7gdmf

PHP : http://tinyurl.com/4lffpeq

I just want to make sure that the credit card fields are filled in .

line 21 :

return field.value.length>0;

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we check the field have one char (>0)
if you want 10 charactere or more :

return field.value.length>=10;

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I meant I want 2 other fields to give alerts if they not filled in

close the question, award points (or not), try to understand the code, create a new question if you encounter difficulties

i do understand the code but it only allows you to validate one field if the third radio button is selected lets forget about credit card fields, in general how would i validate normal fields base on the third button when there is more than one field.

what do you mean by validate ? Not empty ? Check the length propertie of its value (a string)

var myField_Value = document.getElementById( myField_ID ).value;
var myField_Is_Filled = myField_Value.length > 0; // this return true or false

with a field like this one :

<input type="text" id="myField_ID" name="myField_Name" />

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to validate multiple fields : return myField1_Is_Filled && myField2_Is_Filled && myField3_Is_Filled;

yes not empty