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Thread: Need Help with a For Loop

  1. #1

    Thread Starter
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    Need Help with a For Loop

    I'm trying to figure out how to use a for loop to loop through a table of textboxes. In which, the user enters data and then verifies that the data the user has entered is a number or is not empty. Thanks any help would be much appreciated.

    Heres a sample of the code I have for the table:

    <table border cellpadding="3" style= "float: left; width: 300px; clear: left; ">
    <tr>
    <td align="center"><input type="text" size="1" name="group1"/> </td>
    <td align="center"><input type="text" size="1" name="group2"/> </td>
    <td align="center"><input type="text" size="1" name="group3"/> </td>
    <td align="center"><input type="text" size="1" name="group4"/> </td>
    <td align="center"><input type="text" size="1" name="group5"/> </td>
    <td align="center"><input type="text" size="1" name="group6"/> </td>
    </tr>
    <tr>
    <td align="center"><input type="text" size="1" name="group1"/> </td>
    <td align="center"><input type="text" size="1" name="group2"/> </td>
    <td align="center"><input type="text" size="1" name="group3"/> </td>
    <td align="center"><input type="text" size="1" name="group4"/> </td>
    <td align="center"><input type="text" size="1" name="group5"/> </td>
    <td align="center"><input type="text" size="1" name="group6"/> </td>
    </tr>
    <tr>
    <td align="center"><input type="text" size="1" name="group1"/> </td>
    <td align="center"><input type="text" size="1" name="group2"/> </td>
    <td align="center"><input type="text" size="1" name="group3"/> </td>
    <td align="center"><input type="text" size="1" name="group4"/> </td>
    <td align="center"><input type="text" size="1" name="group5"/> </td>
    <td align="center"><input type="text" size="1" name="group6"/> </td>
    </tr>
    </table>

  2. #2
    Hyperactive Member jasonwucinski's Avatar
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    Re: Need Help with a For Loop

    you can iterate over a table, in javascript, by doing something like this:

    Code:
    var table = document.getElementById("myTable");
    for (var i = 0, cell; cell = table.cells[i]; i++) {
         //iterate through cells
    getTB=cell[i].getElementsByTagName("input")
    //gets the value of tb in cell
    
    }
    This iterates over the cells. you should give each control its own unique ID, then you can reference the individual controls in the cell. You will also need to give the table an ID (i used "myTable"). This should get you started. i havent tested this, but it should work with little work
    if i was able to help, rate my post!

  3. #3
    Addicted Member coothead's Avatar
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    Re: Need Help with a For Loop

    Hi there Grizz,

    here is my possible solution to your problem...
    Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
       "http://www.w3.org/TR/html4/strict.dtd">
    <html lang="en">
    <head>
    
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="language" content="english"> 
    <meta http-equiv="Content-Style-Type" content="text/css">
    <meta http-equiv="Content-Script-Type" content="text/javascript">
    
    <title>check inputs for numbers</title>
    
    <style type="text/css">
    #table1 {
        float:left;
        clear:left;
        width:300px;
        border:1px outset #666;
        margin-bottom:10px;
     }
    #table1 td {
        padding:3px;
        border:1px inset #666;
        text-align:center;
     }
    #but {
        clear:both;
        display:block;
     }
    .indicate{
        border-style:solid;
        border-color:#f00;
     }
    </style>
    
    <script type="text/javascript">
    
    function init() {
    
    document.getElementById('but').onclick=function() {
    
       nf=[];
       inps=document.getElementById('table1').getElementsByTagName('input');
    
    for(c=0;c<inps.length;c++) {
    
       inps[c].className='';
    
    if((inps[c].value=='')||(isNaN(inps[c].value))) {
    
       inps[c].className='indicate';   
       nf.push(c+1);
    
      }
     }
    
    if(nf!='') {
    
       alert('input(s)...\n\n'+nf+'\n\n...require your attention');
    
       }
      }
     }
       window.addEventListener?
       window.addEventListener('load',init,false):
       window.attachEvent('onload',init);
    </script>
    
    </head>
    <body>
    
    <div>
    
    <table id="table1"><tr>
    <td><input type="text" size="1" name="group1"></td>
    <td><input type="text" size="1" name="group2"></td>
    <td><input type="text" size="1" name="group3"></td>
    <td><input type="text" size="1" name="group4"></td>
    <td><input type="text" size="1" name="group5"></td>
    <td><input type="text" size="1" name="group6"></td>
    </tr><tr>
    <td><input type="text" size="1" name="group1"></td>
    <td><input type="text" size="1" name="group2"></td>
    <td><input type="text" size="1" name="group3"></td>
    <td><input type="text" size="1" name="group4"></td>
    <td><input type="text" size="1" name="group5"></td>
    <td><input type="text" size="1" name="group6"></td>
    </tr><tr>
    <td><input type="text" size="1" name="group1"></td>
    <td><input type="text" size="1" name="group2"></td>
    <td><input type="text" size="1" name="group3"></td>
    <td><input type="text" size="1" name="group4"></td>
    <td><input type="text" size="1" name="group5"></td>
    <td><input type="text" size="1" name="group6"></td>
    </tr></table> 
    <input id="but" type="button" value="check">
    </div>
    
    </body>
    </html>
    

  4. #4

    Thread Starter
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    Re: Need Help with a For Loop

    Thanks for the help you both really helped me out a lot. I think I now have it figured out. Thanks again!

  5. #5
    Addicted Member coothead's Avatar
    Join Date
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    chertsey, a small town 25 miles south west of london, england.
    Posts
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    Re: Need Help with a For Loop

    No problem, you're very welcome.

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