jacko_162 Posted November 2, 2012 Share Posted November 2, 2012 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. Quote Link to comment https://forums.phpfreaks.com/topic/270204-simple-form-and-calculation/ Share on other sites More sharing options...
codefossa Posted November 2, 2012 Share Posted November 2, 2012 (edited) 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 November 2, 2012 by Xaotique Quote Link to comment https://forums.phpfreaks.com/topic/270204-simple-form-and-calculation/#findComment-1389716 Share on other sites More sharing options...
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