December 2001
Intermediate to advanced
480 pages
9h 22m
English
Content preview from JavaScript Design
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All Text Entries Are Strings
Another feature of form data to remember is that it treats all entries as strings. For example, in setting up an online boutique, you might want to perform math on data entered by the user. The following little script attempts to add two numbers:
<html> <head> <title> Text Box Math </title> <script language="JavaScript"> function addEmUp( ){ var sum=document.calc.aOne.value + document.calc.aTwo.value; alert(sum); } </script> </head> <body bgcolor="#ffffaa"> <h4>Enter 2 numbers and press the Sum button.</h4> <form name="calc"> <input name="aOne" type=text ><P> <input name="aTwo" type=text ><P> <input type=button value="Sum" onClick="addEmUp( )"> </form> </body> </html>
When you run the script, you will see, as ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.