Question

Javascript Problem in IE: object doesn't support this property or method

Asked by: khyer123

I am working on a form that allows people to sign up people onto a team. The form includes a button that allows the user to add people to his roster. When the user clicks the button, a javascript function adds fields to the form. It works great in firefox, but gives me an "object doesn't support this property or method" error in IE, and won't work in Chrome.

Does anyone have any idea as to why it might work only for FF and not for IE/Chrome?

//this is the function 
 
function addToRoster(){
	//find out how many people are already on the roster
	var table = document.getElementById('roster');
	var rows = roster.getElementsByTagName('tr');
	var count = rows.length - 2; //two rows are automatically included: headers and button to add players
	if(count == document.getElementById('ppt').value)
	{
		alert('You have already added the maximum number of players to your roster.');
		return;
	}
	var lastRow = table.rows.length;
	var row = table.insertRow(lastRow);
	
	//name cell
	var nameCell = row.insertCell(0);
	var element = document.createElement('input');
	element.type = 'text';
	element.name = 'name';
	element.size = 30;
	nameCell.appendChild(element);
	
	//rin cell
	var rinCell = row.insertCell(1);
	element = document.createElement('input');
	element.type = 'text';
	element.name = 'rin';
	element.size = 12;
	rinCell.appendChild(element);
	
	
		//email cell
	var emailCell = row.insertCell(2);
	element = document.createElement('input');
	element.type = 'text';
	element.name = 'email';
	element.size = 12;
	emailCell.appendChild(element);
}
 
//this is the button 
<input type="button" value="Add Player" onclick="addToRoster()" />

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Asked On: 2009-10-11 at 20:46:42ID24803590
Tags: javascript
,; ie
,; ajax
Topics: JScript
,; Asynchronous Javascript and XML (AJAX)
Participating Experts: 4
Points: 500
Comments: 12

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Answers

by: zanus123Posted on 2009-10-11 at 21:01:19ID: 25548579

what does your full HTML look like

and does the error give a line number

by: kadabaPosted on 2009-10-11 at 21:19:42ID: 25548622

I tested this as a stand alone and it worked fine... in all the browsers you mentioned...

<html>	
	<head>
		<script type="text/javascript">
		function addToRoster()
		{
				//find out how many people are already on the roster
				var table = document.getElementById('roster');
				var rows = roster.getElementsByTagName('tr');
				var count = rows.length - 2; //two rows are automatically included: headers and button to add players
				if(count == 4)
				{
						alert('You have already added the maximum number of players to your roster.');
						return;
				}
				var lastRow = table.rows.length;
				var row = table.insertRow(lastRow);
				
				//name cell
				var nameCell = row.insertCell(0);
				var element = document.createElement('input');
				element.type = 'text';
				element.name = 'name';
				element.size = 30;
				nameCell.appendChild(element);
				
				//rin cell
				var rinCell = row.insertCell(1);
				element = document.createElement('input');
				element.type = 'text';
				element.name = 'rin';
				element.size = 12;
				rinCell.appendChild(element);
				
				
						//email cell
				var emailCell = row.insertCell(2);
				element = document.createElement('input');
				element.type = 'text';
				element.name = 'email';
				element.size = 12;
				emailCell.appendChild(element);
		}
		</script>
	</head>
	<body>
		<table id="roster" border="1">
			<tr>
				<td>
					This is the header 1
				</td>
				<td>
					This is the header 2
				</td>
				<td>
					This is the header 3
				</td>
			</tr>
			
			<tr>
				<td colspan="3">
					<input type="button" value="Add Player" onclick="addToRoster()" />
				</td>
			</tr>
		</table>
	</body>
</html>

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by: khyer123Posted on 2009-10-11 at 22:04:42ID: 25548707

Here is the full source shown in IE. It's assembled from several .php files.

<html>
<head>
<title>Sports and Recreation Management System</title>
<link rel="stylesheet" type="text/css" href="style.css">
<link rel="stylesheet" type="text/css" href="css/lightbox.css">
<script src="scripts/prototype.js" type="text/javascript"></script>
<script src="scripts/scriptaculous.js" type="text/javascript"></script>
<script src="scripts/lightbox.js" type="text/javascript"></script>
<script src="scripts/functions.js" type="text/javascript"></script>
</script>
</head>
<body>
<div id="main" style="min-height:1500px;" >
	<div id="header">
	
	</div>
	<div id="bar_top">
		<p>Welcome,  (<a href="actions.php?action=logout">Logout)</a> </p>		
	</div>
	<div id="sidemenu">
		<ul>
	<li class="title">Main Menu</li>
	<li><a href="home.php?league=redhawk">Home</a></li><li><a href="sports_info.php?league=redhawk">Sports Information</a></li><li><a href="sports_rules.php?league=redhawk">Sports Rules</a></li><li><a href="policies.php?league=redhawk">Policies</a></li><li><a href="forms.php?league=redhawk">Forms</a></li><li><a href="contact.php?league=redhawk">Contact Information</a></li></ul><ul>
	<li class="title">Sign-Up/Create Team</li>
	<li><a href="newteam.php?league=redhawk">Create New Team</a></li>    
					  <li><a href="freeagent.php?league=redhawk">Free Agent Signup</a></li>
					  <li><a href="signin.php?league=redhawk">Captain Sign-in (exiting teams)</a></li></ul>				<ul>
			<li class="title">Admin Menu</li>
			<li><a href="settings.php">Manage Settings</a></li>
			<li><a href="games.php">Manage Games</a></li>
			<li><a href="contact_info.php">View Contact Info</a></li>
		</ul>	
		
				
	</div>
	<div id="content">
		<h1></h1>
					<h1>Create a New Team</h1>
		<a href="profile.php" class="lbOn"><h2>IMPORANT: Update Profile</h2></a>
		<br>
		<form name="roster" action="actions.php?action=addroster&league=redhawk" onSubmit="return verifyRoster()" method="POST">
		<select name="sport" id="sport" onchange="showInfo()" width="500"  style="width: 500px;">
			<option value="0">SELECT SPORT</option>
			<option value="3">Soccer</option> 		</select>
		<br><br>
 
		<div id="sport_info" class="infodiv" style="display:none;background-color:#FF9B9B">
			Maximum Teams: <input class="noborder" type="text" id="maxteams" />
			<br>
			New Team Signups Available:  <input class="noborder" type="text" id="avail" />
			<br>
			Players Per Team: <input class="noborder" type="text" id="ppt" />
		</div>
		<br>
		<div id="waitlist_notice" class="infodiv" style="display:none;">
			<center><b>This sport is currently full. Should you decide to continue to sign up, you will be added to the waitlist.</b></center>
		</div>
		<br><br>
		<div id="signup_form" style="width:600px;display:none;">
		<table width="550px">
	<col width="50%">
	<col width="50%">
	<thead>
		<th colspan="2"><center>Intramural Sports Signup</center></th>
	</thead>
	<tbody>
		<tr>
			<td>Selected Sport</td>
			<td><input type="text" name="sport_name" id="sport_name" READONLY/></td>
		</tr>
		<tr>
			<td>Team Name</td>
			<td><input type="text" name="team_name" id="team_name" /></td>
		</tr>
		<tr>
			<td>Captain Name</td>
			<td><input type="text" name="captain_name" /></td>
		</tr>
		<tr>
			<td>Captain RIN</td>
			<td><input type="text" name="captain_rin" /></td>
		</tr>
		<tr>
			<td>Captain Phone #</td>
			<td><input type="text" name="captian_phone" /></td>
		</tr>
		<tr>
			<td>Captain E-mail</td>
			<td><input type="text" name="captain_email" /></td>
		</tr>
		<tr>
			<td>Co-Captain Name</td>
			<td><input type="text" name="cocaptain_name" /></td>
		</tr>
		<tr>
			<td>Co-Captain RIN</td>
			<td><input type="text" name="cocaptain_rin" /></td>
		</tr>
		<tr>
			<td>Co-Captain Phone #</td>
			<td><input type="text" name="cocaptain_phone" /></td>
		</tr>
		<tr>
			<td>Co-Captain Email</td>
			<td><input type="text" name="cocaptain_email" /></td>
		</tr>
	</tbody>
</table>
<table width="550px" id="roster">
	<col width="50%">
	<col width="25%">
	<col width="25%">
	<thead>
		<th colspan="4"><center>Team Roster</center></th>
	</thead>
	<tbody>
		<tr>
			<td colspan="4"><input type="button" value="Add Player" onclick="addToRoster()" /> Note: You can add free agents to your roster later</td>
		</tr>
		<tr>
			<td>Name</td>
			<td>RIN</td>
			<td>E-mail</td>
		</tr>
	</tbody>
</table>
<table width="550px" id="times">
	<thead>
		<th><center>Available Times to Play</center>
	</thead>
	<tbody>
		<tr>
		
		</tr>
	</tbody>
</table>
<table width="550px">
	<tr>
		<td><input type="submit" value="Submit Roster"></td>
	</tr>
</table>
 
		</div>
		</form>
		
		
	</div>
	
 
</div>
 
 
 
 
</body>
 
</html>

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by: khyer123Posted on 2009-10-11 at 22:06:52ID: 25548709

Oh, and it gives the error on line 64, char 2

by: xxli79Posted on 2009-10-11 at 22:09:30ID: 25548713

You'd better attach the full HTML and the error message.
But I guess the error was caused by line 6, and recommend write it like this:

var rows = table.rows;

1:

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by: kadabaPosted on 2009-10-11 at 22:22:59ID: 25548739

>> Oh, and it gives the error on line 64, char 2

right click in the browser and view the page source see whats there at line 64

by: khyer123Posted on 2009-10-11 at 22:48:22ID: 25548797

The line 64 looks like it refers to my javascript file.

I changed the code to:

var table = document.getElementById('roster');
var lastRow = table.rows.length;
var row = table.insertRow(lastRow);

Because I didn't need the count variable, and now it tells me "rows.length is null or not an object".

by: pramodkrjsrPosted on 2009-10-11 at 22:50:03ID: 25548801

@kadaba, you have not used field - "ppt",

@khyer123,
Below is working fine with your input box - "ppt" in FF, IE, Chrome

<html>
<head>
    <script type="text/javascript">
 
        function addToRoster() {
            //find out how many people are already on the roster
            var table = document.getElementById('roster');
            var rows = roster.getElementsByTagName('tr');
            var count = rows.length - 2; //two rows are automatically included: headers and button to add players
            if (count == document.getElementById('ppt').value)
            {
                alert('You have already added the maximum number of players to your roster.');
                return;
            }
            var lastRow = table.rows.length;
            var row = table.insertRow(lastRow);
 
            //name cell
            var nameCell = row.insertCell(0);
            var element = document.createElement('input');
            element.type = 'text';
            element.name = 'name';
            element.size = 30;
            nameCell.appendChild(element);
 
            //rin cell
            var rinCell = row.insertCell(1);
            element = document.createElement('input');
            element.type = 'text';
            element.name = 'rin';
            element.size = 12;
            rinCell.appendChild(element);
 
 
            //email cell
            var emailCell = row.insertCell(2);
            element = document.createElement('input');
            element.type = 'text';
            element.name = 'email';
            element.size = 12;
            emailCell.appendChild(element);
        }
    </script>
 
</head>
<body>
 
Players Per Team: <input type="text" id="ppt">
<table id="roster" border="1">
    <tr>
        <td colspan="3"><input type="button" value="Add Player" onclick="addToRoster()"/></td>
    </tr>
    <tr>
        <th>Name</th><th>Rin</th><th>Email</th>
    </tr>
    <tr id="tr"></tr>
</table>
</body>
</html>

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by: khyer123Posted on 2009-10-11 at 22:57:44ID: 25548822

@pramodkrjsr I had removed the code involving the "ppt" - there is no longer a restriction on players per team. But what is with the <tr id="tr"></tr> on line 56 of the code you submitted?

by: pramodkrjsrPosted on 2009-10-11 at 23:00:51ID: 25548829

@khyer123,
Earlier i was trying using getElementById('tr')

Now you may ignore that line.

by: xxli79Posted on 2009-10-11 at 23:02:34ID: 25548833

There are must more than one "roster" elements in the html, like the code below, you'd better check it.

<xxx id="roster" ....>
...
<table id="roster">....

by: khyer123Posted on 2009-10-11 at 23:06:30ID: 31639912

Yep, that was it... the form ID was roster AND the table ID was roster. It all works now. Thanks for your help

20120131-EE-VQP-002

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Javascript Problem in IE: object doesn't support this property or method

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