Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

When submitting a form using OnChange how can I pass a variable to determine if the submit button was clicked or the option field was changeed?

Posted on 2008-10-11
1
Medium Priority
?
220 Views
Last Modified: 2012-05-05
My current script submits the form if a certain option field is changed.  The form is submitted back to the same page for processing with PHP.  The problem is that this triggers my form validation code, and puts a message on the screen prompting the user to correct those errors.

I need to be able to tell if the submit button was pressed, or if 'onchange' submitted the form so that the program logic can decide whether or not to validate the data.  How can I do this?
<form id="invoiceInput" name="invoiceInput" method="POST" action="<?php echo $editFormAction; ?>">
  <select name="invoiceMonth" id="invoiceMonth" onChange="JavaScript:form.submit()">
    <option value=""> </option>
    <option value="months">Months</option>
  </select>
</form>

Open in new window

0
Comment
Question by:CheeserTheAverage
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 82

Accepted Solution

by:
hielo earned 1500 total points
ID: 22695508
>>The problem is that this triggers my form validation code
If this validation is taking place on the server, include a hidden field named "trigger" and when select changes, set it to the id of the select. IF you see trigger has the id of the select you know it was set by the select, otherwiser it was sent by the submit:
<form id="invoiceInput" name="invoiceInput" method="POST" action="<?php echo $editFormAction; ?>">
 <input type="hidden" name="trigger" value="submit"/>
  <select name="invoiceMonth" id="invoiceMonth" onChange="trigger.value=this.id; form.submit()">
    <option value=""> </option>
    <option value="months">Months</option>
  </select>
 <input type="submit" value="Submit" onclick="trigger.value=this.value;"/>
</form> 
NOTE: even if the validation is taking place on the browser via javascript, the principle still applies. On your javascript, if you see trigger=="invoiceMonth" then you know it was NOT initiated by the submit.

Open in new window

0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article is intended for those who are new to PHP error handling (https://www.experts-exchange.com/articles/11769/And-by-the-way-I-am-New-to-PHP.html).  It addresses one of the most common problems that plague beginning PHP develop…
Originally, this post was published on Monitis Blog, you can check it here . In business circles, we sometimes hear that today is the “age of the customer.” And so it is. Thanks to the enormous advances over the past few years in consumer techno…
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.
Suggested Courses

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question