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POCheck for a specific character string using javascript
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copied!<p>How can I write ad check for a specific character string in a text field? </p> <p>If someone types in this identification number in a textfield. <br> Upon submit, it will look if it starts with "D" IE: D959344843 </p> <p>If it does, display a DIV on the page. If not, prompt an error alert message.</p> <p>-=-=-=-=-=-=-=-=-=-=-=--= <br> New addition <br> How can I code this on my page and make it work?</p> <p><code><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"></code> <br /><code><html xmlns="http://www.w3.org/1999/xhtml"></code> <br /><code><head></code> <br /><code><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></code> <br /><code><title>Test</title></code></p> <p><br /><code><script type="text/javascript"></code> <br /><code>var mystring = 'D59344843';</code></p> <p><br /><code>if(mystring.substring(0, 1) == 'D'){</code> <br /><code>//display a DIV</code> <br /><code>alert('cool');</code> <br /><code>}else{</code> <br /><code>alert('error is no kewl');</code> <br /><code>}</code> <br /><code></script></code></p> <p><br /><code></head></code></p> <p><br /><code><body></code> <br /><code><input name="yourtextfield" value="" type="text" /></code> <br /><code><input name="" type="submit" /></code> <br /><code></body></code> <br /><code></html></code></p>

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