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Thread: Listbox Behavior in IE vs. FireFox Issue

  1. #1
    Join Date
    Dec 2005
    Posts
    32

    Listbox Behavior in IE vs. FireFox Issue

    If you go tohttp://www.w3schools.com/js/tryit.asp?filename=tryjs_text and paste the code below using FireFox, you will see the it will remove the last entry and adjust the listbox accordingly.

    <html>
    <head>
    <script type="text/javascript">
    function removeLastOption()
    {
    var x=document.getElementById("mySelect")
    if (x.length>0)
    {
    x.remove(x.length-1);
    }
    }
    </script>
    </head>
    <body>

    <form>
    <select id="mySelect">
    <option>Apple</option>
    <option>Pear</option>
    <option>Banana</option>
    <option>Orange9qrjweirjewltjlwecjoiewjotrjwelkt </option>
    </select>
    <input type="button" onclick="removeLastOption()" value="Remove last option">
    </form>

    </body>
    </html>

    However, if you do the same thing using IE 6, the listbox does not adjust accordingly. Any ideas?

    TIA

  2. #2
    Join Date
    Dec 2003
    Location
    Bucharest, ROMANIA
    Posts
    15,428
    Code:
    function removeLastOption()
    {
    var x=document.getElementById('mySelect').getElementsByTagName('options');
    if (x.length>0)
    {
    x[0].parentNode.removeChild(x[x.length-1]);
    }
    }
    Last edited by Kor; 04-10-2007 at 01:04 PM.

  3. #3
    Join Date
    Aug 2006
    Location
    Turkey
    Posts
    242
    Code:
      
    <script type="text/javascript">
    
    function removeLastOption()
    {
    var x=document.getElementById('mySelect');
    
    if(x.length>0)
    {
    x[0].parentNode.removeChild(x[x.length-1]);
    }
    }
    
    </script>
    
    </head>
    <body>
    
    <form>
    <select id="mySelect">
    <option>Apple</option>
    <option>Pear</option>
    <option>Banana</option>
    <option>Orange9qrjweirjewltjlwecjoiewjotrjwelkt </option>
    </select>
    <input type="button" onclick="removeLastOption()" value="Remove last option">
    </form>
    
    </body>
    </html>

  4. #4
    Join Date
    Oct 2006
    Posts
    120
    Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    	<head>
    		<title>Date born</title>
    		<script type="text/javascript">
    			function eraseOption(sender)
    			{
    				var allOpt = sender.form.elements['root_select'].options;
    				if (allOpt.length > 0) allOpt.length--;
    			}
    		</script>
    	</head>
    	<body>
    		<form action="">
    			<select name="root_select">
    				<option>--------</option>
    				<option>1</option>
    				<option>2</option>
    				<option>3</option>
    				<option>4</option>
    			</select><br>
    			<input type="button" onclick="eraseOption(this)" value="erase">
    		</form>
    	</body>
    </html>

  5. #5
    Join Date
    Aug 2006
    Location
    Turkey
    Posts
    242
    Code:
      
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    	<head>
    		<title>Date born</title>
    		<script type="text/javascript">
    			function eraseOption(sender)
    			{
    				var allOpt = sender.form.elements['root_select'].options.length--;
    				
    			}
    		</script>
    	</head>
    	<body>
    		<form action="">
    			<select name="root_select">
    
    				<option>--------</option>
    				<option>1</option>
    				<option>2</option>
    				<option>3</option>
    				<option>4</option>
    			</select><br>
    
    			<input type="button" onclick="eraseOption(this)" value="erase">
    		</form>
    	</body>
    </html>

  6. #6
    Join Date
    Oct 2006
    Posts
    120
    @samanyolu this is not good, when length property < 0 in IE6 is JS error.

  7. #7
    Join Date
    Aug 2006
    Location
    Turkey
    Posts
    242
    forty
    Thanks..
    You are right.

  8. #8
    Join Date
    Dec 2005
    Posts
    32
    Thanks guys! Below is my working code:

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <script type="text/javascript">

    function removeLastOption()
    {
    var x=document.getElementById('mySelect');

    if(x.length>0)
    {
    x[0].parentNode.removeChild(x[x.length-1]);
    }
    }

    </script>

    </head>
    <body>

    <form>
    <select id="mySelect">
    <option>Apple</option>
    <option>Pear</option>
    <option>Banana</option>
    <option>Orange9qrjweirjewltjlwecjoiewjotrjwelkt </option>
    </select>
    </form>
    <script>
    removeLastOption()
    </script>
    </body>
    </html>

    I needed it to remove the last option without clicking a button and this does it.

    By the way, I'm new in Javascript and I use http://www.w3schools.com/js/tryit.as...ame=tryjs_text to debug my code. Is this the best approach for Javascript debugging?

    Thanks Again!

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