Re: Access form input value in JS variable problem

Monday, May 6, 2013

Simple -- write your own version of "getElementById"

Check out "GetById()" in the page below.

There are limitations, of course. GetById()  is not case-sensitive, meaning "ixv[list]" will be treated the same as "Ixv[List]", and spaces in the id are significant, meaning that "ixv[list]" is different from "ixv [list]"

This solution works in IE, Firefox, Chrome, Safari, and Opera.

<title>Fix for David Alyea</title>

var Undef;

function Gid(id) {

function ShowIdByTagName(TagName) {
    var s = "", i, a = document.getElementsByTagName(TagName);
    for (i = 0; i < a.length; i++)
        s += a [i].id + ", ";
    return s;

function GetById(TagName, id, num) {
    var i, a = document.getElementsByTagName(TagName);
    if (num == Undef)
        num = 1;
    for (i = 0; i < a.length; i++)
        if (id.toUpperCase() == a [i].id.toUpperCase() && --num <= 0)
            return a [i];

function check(num) {
    var x=GetById("INPUT","ixv[list]",num).value;

<form id="f" method="get" action="/code/submit.php">
<input type="text" name="var[list]" id="ixv[list]" value="">
<button type="button" onclick="check(1);">Save</button>
<input type="text" name="var[list]" id="ixv[list]" value="">
<button type="button" onclick="check(2);">Save</button>
<button type="button" onclick="alert(ShowIdByTagName('INPUT'));">Show</button>

On Saturday, May 4, 2013 7:48:52 PM UTC-4, David Alyea wrote:
I have a form for which I cannot change the input value field names. One such field is in the HTML as follows:

<body>  <form id="f" method="get" action="/code/submit.php">  <input type="text" name="var[list]" id="ixv[list]" value="">  <button type="button" title="Save" onclick="check();">  </form>  </body>

Now in my javascript, I want to access that input value. I tried this, and of course it doesn't work since [] looks like an array in JS.

function check() {  var x=var[list].value;  alert(x);  }

The problem is that the variable name has [] in it. How can I get that input field value in javascript?

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