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can we control the object is set to hidden or has been disable?

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Sep 06.2004

Hi,

Is that possible to control some object that is set to hidden or disable?

I got a check box and two dropdownlist(visible = false or enable = false, set to the property at the begining), if user checked the checkbox, the two dropdownlist will be show (visible = true or enable = true).

I get an object required error if I set the property(visible) of two object to false. If I set to (enable = false), it was do nothing.

Therefore, I try to set back the object to default(Visible = true, Enable = true), then the code is working.

Anyone have idea to help to solve this problem.
Thank you.

Calvin

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JavaScript

4 Comments(s) ↴

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@HaganeNoKokoroSep 06.2004 — Can you show the code you are trying to use?
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@steelersfan88Sep 06.2004 — For exmaple:<!-- DOCTYPE -->
<html>
<head>
<title>Example</title>
<script type="text/javascript">

Number.prototype.toStat = function() { return ((this==0) ? false : "disabled") }
function setStatus(nm,status) {
document.getElementById(nm).disabled = status.toStat();
}

</script>
</head>
<body>

<p>
<label>Enable<input type="radio" name="clr" checked onclick="setStatus('box',0)"></label><br>
<label>Disable<input type="radio" name="clr" onclick="setStatus('box',-1)"></label><br>
</p>
<div>
<select id="box">
<option value="fee">fee</option>
<option value="fie">fie</option>
<option value="foe">foe</option>
<option value="fum">fum</option>
</select>
</div>


</body>
</html>will change that staus of the disabled property between false and disabled. Although, I'm not sure what you want, I can say:

> Make sure when setting the propert yto a Boolean value, set it to the Boolena (false), not the string implementation ("false").

Dr. Script
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@KorSep 06.2004 — 
  • 1. There is no [b]enable[/b] HTML attribute, but there is a [b]disabled[/b] attribute which accept boolean true/false values.


  • 2. [b]visibility[/b] is a CSS attribute and has values [b]visible/hidden[/b] (for IE5+, NS6+, Moz...), not boolean true/false.


    • To manipulate disable status:
    [code=php]
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    <title>Untitled Document</title>
    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
    <meta http-equiv="Content-Style-Type" content="text/css">
    <meta http-equiv="Content-Script-Type" content="text/javascript">
    <script language="JavaScript" type="text/JavaScript">
    function dis(c,f,n){
    if(c.checked){
    f.elements[n].disabled=false;
    }
    else{f.elements[n].disabled=true;}
    }
    </script>
    </head>
    <body>
    <form>
    <input type="checkbox" onclick="dis(this,this.form,'list1')">
    <br>
    <select name="list1" disabled>
    <option>blah</option>
    <option>blah1</option>
    </select><br>
    <input type="checkbox" onclick="dis(this,this.form,'list2')">
    <br>
    <select name="list2" disabled>
    <option>foo</option>
    <option>foo2</option>
    </select>
    </form>
    </body>
    </html>
    [/code]

    To manipulate the elements CSS preset visibility:
    [code=php]
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    <title>Untitled Document</title>
    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
    <meta http-equiv="Content-Style-Type" content="text/css">
    <meta http-equiv="Content-Script-Type" content="text/javascript">
    <script language="JavaScript" type="text/JavaScript">
    function dis(c,f,n){
    if(c.checked){
    f.elements[n].style.visibility='visible';
    }
    else{f.elements[n].style.visibility='hidden';}
    }
    </script>
    </head>
    <body>
    <form>
    <input type="checkbox" onclick="dis(this,this.form,'list1')">
    <br>
    <select name="list1" style="visibility:hidden">
    <option>blah</option>
    <option>blah1</option>
    </select><br>
    <input type="checkbox" onclick="dis(this,this.form,'list2')">
    <br>
    <select name="list2" style="visibility:hidden">
    <option>foo</option>
    <option>foo2</option>
    </select>
    </form>
    </body>
    </html>
    [/code]
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    @edustreetauthorSep 07.2004 — Thank all of you.

    Calvin:p
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