Jump to content

Simple Form And Calculation


jacko_162

Recommended Posts

I want a simple form with 1x Input field;

 

<form>
<input name='Volume' type='text' />
<input type='hidden' name='value' value ='850' />
<input type='submit' name='Calculate' />
</form>

 

the input will be a number only, if the user inputs 5 for example:

 

i want it to perform the following maths:

 

5x$value (5x850) and display the result when the user clicks submit.

 

Also if the user submits a number bigger than 320000 can we output an error message?

 

how would i go about this using simple js ? i have no idea how to code js at the moment.

Link to comment
Share on other sites

Here's a little example with jQuery.

Demo: http://xaotique.no-ip.org/tmp/14/

 

index.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
   <head>
       <title>Xaotique</title>
       <meta http-equiv="content-type" content="text/html;charset=utf-8" />
       <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
       <script type="text/javascript" src="script.js"></script>

       <style type="text/css">
           body
           {
               font-size: 12px;
           }

           input
           {
               width: 150px;
           }

           #result
           {
               color: #000099;
               font-size: 14px;
           }
       </style>
   </head>

   <body>
       <b>Input:</b> <input type="text" id="myval" /> <b>Multiplied by 5:</b>
       <span id="result"><span style="color: red;">Javascript Not Enabled</span></span>
   </body>
</html>

 

script.js

$(document).ready(function()
{
   // Value Default Vars
   var min = 0, max = 320000, defaultValue = 850;

   // Set Defaults
   $("#myval").val(defaultValue).keyup();

   // Calculate When Changed
   $("#myval").keyup(function()
   {
       // Parse Inputted Value
       var value = parseInt($("#myval").val());

       // Check If Low, High, or Invalid
       if (value < min || isNaN(value * 5))
           value = min;
       else if (value > max)
           value = max;

       // Show Result
       $("#myval").val(value);
       $("#result").html(value * 5);
   });

   // Backup If Using Paste
   $("#myval").change($("#myval").keyup());
});

Edited by Xaotique
Link to comment
Share on other sites

This thread is more than a year old. Please don't revive it unless you have something important to add.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.