create an array of field to test if they are null

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  • SAN CAZIANO
    #1

    create an array of field to test if they are null

    is there a function that get the name of the first input field of the
    current form ?
    in my example below I want create an array of form field name and in the
    onsubmit assign all element's name to create a simple iteration to test if
    some elements in my array, that must be required, are null:
    something like function verify(array of string) and in onsubmit something
    like return onsubmit(field1 ,field2,field3. ...)

    <HTML>
    <HEAD>
    <TITLE>Confir m Dialog Test</title>

    <SCRIPT LANGUAGE=JAVASC RIPT>
    function verify()
    {
    if(document.for ms[0].GetElementById[0].value=="")
    {
    alert("Please enter a value in the field");
    return false;
    }
    else{
    return true;
    }
    }
    </SCRIPT>
    </HEAD>
    <BODY>
    <FORM onSubmit="retur n verify()">
    Name: <INPUT TYPE=TEXT NAME="myName">< BR>
    <INPUT TYPE=SUBMIT VALUE="Submit">
    </FORM>
    </BODY>
    </HTML>


    Tags: None
    • Michael Winter
      #2
      Re: create an array of field to test if they are null

      On Wed, 06 Oct 2004 14:13:21 GMT, SAN CAZIANO <alberto.kalb@t in.it> wrote:
      [color=blue]
      > is there a function that get the name of the first input field of the
      > current form ?[/color]

      No, but you can use the elements collection to get form controls by
      ordinal number:

      formObj.element s[0] // first element
      formObj.element s[1] // second, etc...

      and from that you can get the name or id:

      formObj.element s[0].name or .id

      However, that isn't really necessary for what you (seem to) want to do.
      [color=blue]
      > in my example below I want create an array of form field name and in the
      > onsubmit assign all element's name to create a simple iteration to test
      > if some elements in my array, that must be required, are null:
      > something like function verify(array of string) and in onsubmit
      > something like return onsubmit(field1 ,field2,field3. ...)[/color]

      If you use

      <form ... onsubmit="retur n verify(this)">

      function verify(form) {

      you can use the elements collection, as I demonstrated above.

      To check that the first control has a value:

      function verify(form) {
      if('' == form.elements[0].value) {
      alert('Please enter a value');
      return false;
      }
      }

      If you want to actually use the name of the control, substitute the number
      with a string containing that name:

      if('' == form.elements['myName'].value) {

      [snip]
      [color=blue]
      > <SCRIPT LANGUAGE=JAVASC RIPT>[/color]

      Don't use the language attribute any more. Not only is it deprecated, but
      the required type attribute makes it redundant.

      <script type="text/javascript">

      [snip]

      I hope that helps,
      Mike

      --
      Michael Winter
      Replace ".invalid" with ".uk" to reply by e-mail.

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