Validation for multiple select list box

Hi,
I am using a multiple select list box.

I use an array to retrieve the values that are selected by the user.

Expand|Select|Wrap|Line Numbers

<select name="competitor[]">

When I try to validate the list box if the user does not select anything, I get errors. The error deals with the array declared.

I am using PHP and the validation is done in Javascript. Please help out.

Thanks in advance.

Apr 14 '09 #1

Subscribe Post Reply

12214

RamananKalirajan

608

512MB

Expand|Select|Wrap|Line Numbers

 <html>

<head>

<script type="text/javascript">

function selectMultiple()

  {

    var myArray="";

         try

          {

           for (var i=0; i<document.getElementById('mySelect').options.length; i++)

          { 

                      if (document.getElementById('mySelect').options[i].selected == true) 

                       { 

                          //alert(document.getElementById('mySelect').options[i].text);

              myArray += document.getElementById('mySelect').options[i].text + ";";

                        } 

          }
 
           var resArray = myArray.split(";");

           if(resArray.length<=1) 

             alert("Please select the values in the list");

           else 

             alert("You have selected = "+(resArray.length-1));             

         }

        catch(e)

        {

           alert(e.message);    

        }
 
}

</script>

</head>

<body><form>

<select name="mySelect" size="10" multiple>

  <option>Apple</option>

  <option>Pear</option>

  <option>Pea</option>

  <option>Banana</option>

  <option>Orange</option>

  <option>Mango</option>

  <option>Lime</option>

  <option>Goa</option>

  <option>Dates</option>

</select>

<input type="button" onclick="selectMultiple()" value="Select multiple">

</form></body>

</html>

This is a validation for the multiple select box. As you were specifying array. I did this way. But i am not clear wether r u looking for this kind of validation or not.

Regards
Ramanan Kalirajan

Apr 14 '09 #2

acoder

16,027

Expert Mod 8TB

I don't think that's what he meant and anyway, the code is incorrect because the select element has no ID.

You can get the element by name:

Expand|Select|Wrap|Line Numbers

document.forms[formname].elements["competitor[]"];

then get its options and validate.

Apr 14 '09 #3

dmjpro

2,476

2GB

@Acoder
is "name[]" that a valid name?

Apr 15 '09 #4

Similar topics

multi-select box validation

by: Greg Bryant | last post by:

Hi folks. I'm porting a cf site to php, everything's going very well, I like php much better (this, of course, being the correct forum to make that statement :). One problem I have is with...

PHP

Automated Form Validation?

by: Stefan Richter | last post by:

Hi, after coding for days on stupid form validations - Like: strings (min / max length), numbers(min / max value), money(min / max value), postcodes(min / max value), telefon numbers, email...

PHP

Client-side Javascript validation of "select multiple" for PHP

by: Phil Powell | last post by:

Has anyone here ever done a case where you have a select multiple form element and you have to do both server-side and client-side validation? I am honestly not sure how to do it in Javascript (I...

Javascript

Phone Validation Problem (I reformatted the code to make it easier to read)

by: AnnMarie | last post by:

Javascript

Validation problem with select object using multiple attribute

by: Griff | last post by:

Hi! I'm using JavaScript on an HTML page for form validation. I have a form value (theForm.ProdType1) which represents a picklist from which users may make multiple selections; essentially,...

Javascript

Enforcing Validation based on Drop-Down choice

by: EviL KerneL | last post by:

Hi - I am trying to figure out a way to enforce the validation included for this form based on whether the user chooses "email" or "phone" as the contact choice. Right now it is set to enforce...

Javascript

List box Validation

by: adam.lock | last post by:

Hi I have a form which has 10 list boxes on it, each with a select option with values 0 to 3. Once the user submits the form, I want to validate that only three of the list boxes have been...

Javascript

Form validation with PHP/Javascript

by: Chris | last post by:

Hi, I have a form for uploading documents and inserting the data into a mysql db. I would like to validate the form. I have tried a couple of Javascript form validation functions, but it...

PHP

form validation design setup

by: Rik | last post by:

Hello guys, now that I'm that I'm working on my first major 'open' forms (with uncontrolled users I mean, not a secure backend-interface), I'd like to add a lot of possibilities to check wether...

Javascript

Easy Steps to Fix "Canon Printer Won't Connect to WiFi Network"

by: taylorcarr | last post by:

A Canon printer is a smart device known for being advanced, efficient, and reliable. It is designed for home, office, and hybrid workspace use and can also be used for a variety of purposes. However,...

General

Batch import of multiple excel files into the database

by: ryjfgjl | last post by:

If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...

Data Management

Merging data from multiple Excel files

by: ryjfgjl | last post by:

In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...

Data Management

Migrating Website to Cloud - Emmanuel Katto

by: emmanuelkatto | last post by:

Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel

General

Is that possible of reading the .csv file in column wise and the column have different lengths ?

by: Sonnysonu | last post by:

This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...

C / C++

How to build RAID in BIOS?

by: Hystou | last post by:

There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...

Computer Hardware

What is ONU?

by: marktang | last post by:

ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...

General

Changing the language in Windows 10

by: Hystou | last post by:

Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...

Windows Server

Maximizing Business Potential: The Nexus of Website Design and Digital Marketing

by: jinu1996 | last post by:

In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...

Online Marketing