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I have an html form that I would like to add inputs fields to using javascript. Originally I had the input fields by themselves underneath the 'body', and the following was able to add the fields:

            // Create number input field
            var phoneInput = document.createElement("INPUT");
            phoneInput.id = "phone" + instance;
            phoneInput.name = "phone" + instance;
            phoneInput.type = "text";

            // Insert that stuff
            document.body.insertBefore(document.createElement("BR"), element);
            document.body.insertBefore(phoneLabel, element);
            document.body.insertBefore(phoneInput, element);

I then added a 'form' element around the original inputs in the html file.

    <body>
    <form action=searchform.php method=GET>
        <LABEL for="phone1">Cell #: </LABEL>
        <input id="phone1" type="text" name="phone1">
        <input type="button" id="btnAdd" value="New text box" onclick="newTextBox(this);" />
    </form>
    </body>

Now the button doesn't add new text boxes. Have I structured this incorrectly? Thanks!

I have an html form that I would like to add inputs fields to using javascript. Originally I had the input fields by themselves underneath the 'body', and the following was able to add the fields:

            // Create number input field
            var phoneInput = document.createElement("INPUT");
            phoneInput.id = "phone" + instance;
            phoneInput.name = "phone" + instance;
            phoneInput.type = "text";

            // Insert that stuff
            document.body.insertBefore(document.createElement("BR"), element);
            document.body.insertBefore(phoneLabel, element);
            document.body.insertBefore(phoneInput, element);

I then added a 'form' element around the original inputs in the html file.

    <body>
    <form action=searchform.php method=GET>
        <LABEL for="phone1">Cell #: </LABEL>
        <input id="phone1" type="text" name="phone1">
        <input type="button" id="btnAdd" value="New text box" onclick="newTextBox(this);" />
    </form>
    </body>

Now the button doesn't add new text boxes. Have I structured this incorrectly? Thanks!

  • javascript
  • html
  • forms
Share Improve this question edited Jan 30, 2010 at 10:41 skaffman 404k96 gold badges824 silver badges775 bronze badges asked Dec 23, 2009 at 7:54 MattMatt 1711 gold badge3 silver badges6 bronze badges
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3 Answers 3

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This is because you are appending the elements to the body, which means that insertBefore cannot find element (because it's in the <form>, not the <body>), so it never gets inserted.

A quick way to fix this would be to use document.body.firstChild.insertBefore. However, if the form is no longer the first element in the body, this will no longer work.

A cleaner, better way would be to give your form an ID (e.g. <form id="myform">), and then access the form using: document.getElementById("myform").insertBefore. Then you can place your form anywhere, and it will still be accessible using the ID.

Easiest would be to use jQuery. Add an ID to your form, for easier reference:

<form id="myform" action="action" method="GET">
  <input type="hidden" name="a" value="1"/>
  <input type="hidden" name="b" value="2"/>
</form>

<script type="text/javascript">
  $("#myform").append('<input type="hidden" name="c" value="3"/>');
</script>

You can later change the value of your new input, by easily referring to it:

$("#myform input[name='c']").val(7);

Gve the form an id

<form id="myForm" action="searchform.php" method="GET">

Create the JavaScript elements just as you used to, then you can just add the elements like so:

var f = document.getElementById('myForm');
f.appendChild(document.createElement('br'));
f.appendChild(phoneLabel);
f.appendChild(phoneInput);

(insertbefore would work on f as well, although I think this is more readable.)

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