Solved

array elements getElementById

Posted on 2006-10-26
6
8,236 Views
Last Modified: 2013-11-19
Okay maybe this is easy and I'm just entirely missing the concept, but since I urgently need it and can't figure it out, it's a 500.

I know that we can do this :

document.frmName.eleName[#].value;

but is there a way to get this with getElementById?

I have an array of elements named HR for regular hours, but i'd like to get their values through a loop to calculate totals.

I tried doing document.getElementById('HR')[#].value but it gives an error.

Thanks!
0
Comment
Question by:arvanhalleorg
6 Comments
 
LVL 54

Expert Comment

by:b0lsc0tt
ID: 17815029
arvanhalleorg,

Since a tag's id should be unique on that page getElementById just returns that tag.  It would not work in this case and your page may have other issues with duplicating ids.  I recommend that you look at getElementsByTagName.  That will return a "collection" that you could loop through to find the exact ones you want or, if they are the only ones with that tag, then it will not need the loop.

Let me know if you have any questions or need more information.  If you need more details then please provide the relevant code you are using.

b0lsc0tt
0
 
LVL 63

Expert Comment

by:Zvonko
ID: 17815162
The method getElementById() will return only the First element with that id.
But what is the problem to get first the collection of all elements with the given name?

var elemColl = document.frmName.eleName;

Then is the twentyfirst element accessed like this:

elemColl[21].value = "some value";


0
 
LVL 41

Expert Comment

by:HonorGod
ID: 17816520
You might also consider using

  var tables = document.getElementsByTagName( 'table' );

This will be a collection (array) of references to every table on your page, the first of which could be manipulated using something like:

  var table = tables[ 0 ];

Now that you have a reference to a particular table, you can locate the individual 'tr' elements in that table using:

  var rows = table.getElementsByTagName( 'tr' );

Since the method was executed using the specific "table" reference, the result will be a collection of the row references,
but only for this specific table.
0
ScreenConnect 6.0 Free Trial

Discover new time-saving features in one game-changing release, ScreenConnect 6.0, based on partner feedback. New features include a redesigned UI, app configurations and chat acknowledgement to improve customer engagement!

 
LVL 2

Author Comment

by:arvanhalleorg
ID: 17816544
well i wanted to use document.form.element.yadayada but can I do this without the document.form part? I refuse to put a form on my page cause frankly i'm not going to submit the thing, it's only the javascript that is taking the data and using xmlHttp.Send to get the asp to make the changes in the background. I was wanting to use getElementById for that reason, cause it doesnt ask me for the form.

So, does the following work?

HR[#].value;

or do I absolutely have to use the full syntax?
0
 
LVL 3

Accepted Solution

by:
jabaswavika earned 500 total points
ID: 17817601
You should use document.getElementsByName method. This would give you all the elements with that name

Use (document.getElementsByName('HR'))[#].value
    to get the value of your HR element. Note that the NAME, I repeat the NAME should be "HR". rather than the tagname or the id for the method to work.

See the test code below

<html>
<body>
<input type="text" name="test"/><br/>
<input type="text" name="test"/><br/>
<input type="text" name="test"/><br/>
<input type="button" onClick="testing();">
<script>
function testing(){
alert((document.getElementsByName("test"))[0].value);
alert((document.getElementsByName("test"))[1].value);
alert((document.getElementsByName("test"))[2].value);
}
</script>
</body>
</html>
</script>
</body>
</html>
0
 
LVL 2

Author Comment

by:arvanhalleorg
ID: 17818147
Sweet! That's perfect. :D Thank you!
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

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

I found this questions asking how to do this in many different forums, so I will describe here how to implement a solution using PHP and AJAX. The logical flow for the problem should be: Write an event handler for the first drop down box to get …
This article demonstrates how to create a simple responsive confirmation dialog with Ok and Cancel buttons using HTML, CSS, jQuery and Promises
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…

773 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