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Answer 1

+1 A:

You code snippet you posted doesn't work.

here is a version that does work (is tested)

<html>
<head>
<title>Tarea test</title>
<script type="text/javascript">

function id (e) {
    return document.getElementById(e);
}

window.onload = function () {

    var oElement = id('message');
    var iMaxChars = 300;

    oElement.onblur = getHandler(iMaxChars);
    oElement.onfocus = getHandler(iMaxChars);
    oElement.onchange = getHandler(iMaxChars);
    oElement.onkeyup = getHandler(iMaxChars);

    updateTextArea('message', iMaxChars);

}

function getHandler(iMaxChars) {
  return function () { updateTextArea('message', iMaxChars) };
}

function updateTextArea(sTextAreaID, iMessageMaxLength) {
    var oTextAreaNode = id(sTextAreaID);
    var oMessageCounter = id('messagecounter');

    var sMessageValue = oTextAreaNode.value;
    var iMessageLength = sMessageValue.length;

    if (iMessageLength > iMessageMaxLength) {
     oTextAreaNode.value = sMessageValue.substr(0, iMessageMaxLength);
     iMessageLength=iMessageMaxLength;
    }
    oMessageCounter.innerHTML = ""+(iMessageMaxLength - iMessageLength);
}

</script>
</head>
<body>

<form action="#" method="post"> 
  <fieldset> 
    <label for="message" id="messagelabel">Message <span id="messagecounter">300</span></label> 
    <textarea id="message" name="message" rows="10" cols="50"></textarea> 
  </fieldset>
</form>
</body>
</html>

In you example you are trying to get a value from a string. textareaid.value textareaid isn't a node in this scope.

Robert Cabri 2009-10-16 09:02:20

Hah, a tumbleweed badge, then a correct, working answer. Right on sir!

Alex Mcp 2009-10-16 18:39:58

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FBJS textarea countdown

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