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Thread: dynamic form creation

  1. #1
    Join Date
    Nov 2010
    Posts
    19

    dynamic form creation

    Hello!

    A while back, I asked for some help with dynamic form creation. I wanted a user to be able to enter into a text field how many designs he or she would like, then, based on that number, be provided with a pair of text boxes that asked 1) name of design 2) quantity of that particular design.

    I received this cool way of doing it by user thraddash :


    <head>
    <script type="text/javascript">

    function BuildFormFields($amount)
    {
    var
    $container = document.getElementById('FormFields'),
    $item, $field, $i;

    $container.innerHTML = '';
    for ($i = 0; $i < $amount; $i++) {
    $item = document.createElement('div');
    $item.style.margin = '3px';

    $field = document.createElement('span');
    $field.innerHTML = 'Name of Design';
    $field.style.marginRight = '10px';
    $item.appendChild($field);

    $field = document.createElement('input');
    $field.name = 'Design[' + $i + ']';
    $field.type = 'text';
    $item.appendChild($field);

    $field = document.createElement('span');
    $field.innerHTML = 'Quantity of Design';
    $field.style.margin = '0px 10px';
    $item.appendChild($field);

    $field = document.createElement('input');
    $field.name = 'Quantity[' + $i + ']';
    $field.type = 'text';
    $item.appendChild($field);

    $container.appendChild($item);
    }
    }

    </script>

    </head>
    <body>

    <form method="post" action="order.php">
    How Many? <input type="text" onkeyup="BuildFormFields(parseInt(this.value, 10));" />
    <div id="FormFields" style="margin: 20px 0px;"></div>
    <input type="submit" />
    </form>

    </body>
    </html>



    As a followup, I wonder how to control in a table where each of these text boxes will appear. Any help is very appreciated. Thank you in advance!

    Thomas

  2. #2
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    If you mean a html table then create this using dom methods: http://www.howtocreate.co.uk/tutoria...ript/domtables.

    Using a '$' in scripting can create side effects if a JavaScript library is used. All libraries use it as a special meaning.
    Also the iteration used in the name attributes is probably unnecessary as php will see Quantity[] as an array.

  3. #3
    Join Date
    Nov 2010
    Posts
    19
    thank you for your reply.

    I read the page at the link you supplied and it does seem pretty useful. I am, however, too novice to understand where to put that code into my code.

    When I put it here, where it seems sensible to me, it broke.

    var theTable = document.getElementById('order_table_1');
    theTable.tBodies[0].appendChild(document.createElement('tr'));
    $field = document.createElement('span');
    $field.innerHTML = 'Name of Design';
    $field.style.marginRight = '10px';
    $item.appendChild($field);


    Can you be more specific on how to implement this please? Thanks again!
    Thomas

  4. #4
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    Simpler version
    Code:
    function BuildFormFields(amount)
    {
    var container = document.getElementById('FormFields');
    container.innerHTML = '';
    var tab = '<table><tbody><tr><th>Name of Design</th><th>Quantity of Design</th></tr>';
    for (var i = 0; i < amount; i++) {
        tab += '<tr><td><input type="text" name="Design[]"></td><td><input type="text" name="Quantity[]"></td></tr>';
        }
    container.innerHTML = tab +  '</tbody></table>';
    }

  5. #5
    Join Date
    Nov 2010
    Posts
    19

    file upload with progress bar possible too

    Yes, the innerHTML is a lot less verbose. Thank you!

    How could you apply a file upload (FTP) button and an ajax progress bar to each iteration of that loop?

    Thomas

  6. #6
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    A file upload input?
    What has Ajax got to do with this script?

  7. #7
    Join Date
    Nov 2010
    Posts
    19
    Since the files being transferred are pretty heavy (60 - 80 mb), I thought I'd incorporate a progress bar so the user will know something is happening. I was under the impression that Ajax was necessary for that back-and-forth communication so the progress bar would know what amount of the file had been received in order to change it's level of completion.
    Attached Images Attached Images

  8. #8
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    Ajax can't upload images, it can only fake it using an iframe
    http://valums.com/ajax-upload/

  9. #9
    Join Date
    Nov 2010
    Posts
    19
    yes. i thought I would use php to upload the file, then ajax to show the progress; is this inaccurate?

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