Solved

Array in forms

Posted on 2002-04-11
9
19,732 Views
Last Modified: 2011-08-18
I have a form like this

<form>
<input type="hidden" name="hiddenField" value="">
<input type="text" name="field[0]" value="a">
<input type="text" name="field[1]" value="b">
<input type="text" name="field[2]" value="c">
</form>

With Javascript, is there an other way to refer to "field[0]" than with

document.forms[0].elements[1].value

??

If I have a lot of form-fields in the form, it's hard to keep track of the index of each element.

What I'm thinking of is something similar to

document.forms[0].field[0].value

but which is legal.

Batalf

0
Comment
Question by:Batalf
[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
  • 6
  • 3
9 Comments
 
LVL 33

Expert Comment

by:knightEknight
ID: 6935343
I would not use [ or ] in your field names, but you can do this:

  <form name='myform'>
   <input type="text" name="field0" value="a">
   <input type="text" name="field1" value="b">
   <input type="text" name="field2" value="c">
  </form>



and then in your script:

  for ( var i=0; i<3; i++ )
  {
     alert( eval("document.myform.field" + i + ".value") );
  }
0
 
LVL 33

Expert Comment

by:knightEknight
ID: 6935347
or:

   for ( var i=0; i<3; i++ )
   {
      alert( eval("document.forms[0].field" + i + ".value") );
   }
0
 
LVL 32

Author Comment

by:Batalf
ID: 6935352
But then it's a little bit harder to read by our serverside-script(PHP). It's easier to just loop through an array.

Batalf
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 33

Expert Comment

by:knightEknight
ID: 6935360
then just give all your fields the same name:

 <form name='myform'>
  <input type="text" name="myfield" value="a">
  <input type="text" name="myfield" value="b">
  <input type="text" name="myfield" value="c">
 </form>


  for ( var i=0,n=document.forms[0].myfield.length; i<n; i++ )
  {
     alert(document.forms[0].myfield[i].value);
  }
0
 
LVL 33

Expert Comment

by:knightEknight
ID: 6935369
... the browser will create an array of fields off the form call "myfield", and you can loop thru it as above.
0
 
LVL 32

Author Comment

by:Batalf
ID: 6935378
Hm. Interesting idea you present here. I didn't know that Javascript did that. But: The problem with this solution is that PHP on the server doesn't recognize myfield as an array. It looses all values except the last one only the value "c" seems to be sent to the server.

Batalf
0
 
LVL 33

Expert Comment

by:knightEknight
ID: 6935481
well, I am not comfortable using [ or ] in field names, but if it works for you in every other respect, then perhaps a variation on my previous idea will work (not tested)


  <form>
   <input type="hidden" name="hiddenField" value="">
   <input type="text" name="field[0]" value="a">
   <input type="text" name="field[1]" value="b">
   <input type="text" name="field[2]" value="c">
  </form>



  for ( var i=0; i<3; i++ )
  {
     alert( eval("document.forms[0].field[" + i + "].value") );
  }
0
 
LVL 33

Accepted Solution

by:
knightEknight earned 50 total points
ID: 6935486
or maybe:

 for ( var i=0; i<3; i++ )
 {
    alert( eval("document.forms[0].elements['field[" + i + "]'].value") );
 }
0
 
LVL 32

Author Comment

by:Batalf
ID: 6935491
Thank you! That did the trick.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering 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

Suggested Solutions

Title # Comments Views Activity
Javascript Regex 7 20
arrays and radio buttons 10 40
Why is my $_POST not going to results page 10 41
Add - in a loop to first and last element. 6 42
In this article, we'll look how to sort an Array in JavaScript, including the more advanced techniques of sorting a collection of records either ascending or descending on two or more fields. Basic Sorting of Arrays First, let's look at the …
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?
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

726 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