?
Solved

Javascript Validation for Dropdown list array

Posted on 2004-07-30
6
Medium Priority
?
339 Views
Last Modified: 2008-02-20
Hi,

I have used a select box array to capture multiple selected values as :

<select name="food[]" index="food" multiple>
  <option>Ham</option>
  <option>Coke</option>
  <option>Pizza</option>
  <option>Cheese</option>
</select>

This code works fine with PHP, but fails with javascript validation    :(

Any idea how do I do it...

Thanks,
0
Comment
Question by:guifreak
[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
  • 2
6 Comments
 

Expert Comment

by:kevinKohler
ID: 11677075
Hello,

This is what you need to validation that data.

<script language="JavaScript">
function validatefood() {
Food=theForm.food.selectedIndex;
if (Food=='-1') {
alert('Please Select food');
event.returnValue=false;
}
}
</script>

<form name="theForm">
<select name="food" index="food" multiple>
  <option>Ham</option>
  <option>Coke</option>
  <option>Pizza</option>
  <option>Cheese</option>
</select>
<INPUT type="Submit" value="Submit Change" onclick="validatefood();">
0
 
LVL 35

Expert Comment

by:mrichmon
ID: 11678393
You cannot have a select box name be an array.

If you want it in array format then have javascript assemble the array for you although really if you just have a regular variable it will submit as a delimited list and then you can turn it into an array in PHP
0
 
LVL 18

Accepted Solution

by:
arantius earned 400 total points
ID: 11689185
Assign an ID to your select tag:
<select name="food[]" index="food" multiple id="foodSelect">

And use the ID to refer to the element in javascript:
var sel=document.getElementById("foodSelect")
if (sel.selectedIndex ......
0
 
LVL 18

Expert Comment

by:arantius
ID: 11689189
BTW mrichmon: Yes you can have the name be an array.  That's how you tell PHP to take ALL selected values of that element, not just the last one.  And kevin, that's why he needs to keep it that way.
0

Featured Post

Optimize your web performance

What's in the eBook?
- Full list of reasons for poor performance
- Ultimate measures to speed things up
- Primary web monitoring types
- KPIs you should be monitoring in order to increase your ROI

Question has a verified solution.

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

There’s a good reason for why it’s called a homepage – it closely resembles that of a physical house and the only real difference is that it’s online. Your website’s homepage is where people come to visit you. It’s the family room of your website wh…
Today, the web development industry is booming, and many people consider it to be their vocation. The question you may be asking yourself is – how do I become a web developer?
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.
The is a quite short video tutorial. In this video, I'm going to show you how to create self-host WordPress blog with free hosting service.
Suggested Courses

777 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