Question

javascript eval returns an error using JSON in IE but not in firefox

Asked by: ewan69

Hi,

I am using ajax and json and all works o.k. in firefox but throws an error in IE, can anyone see where I am going wrong?
The error is  " Expected '}'" on the data=eval line below.

Below is a basic example of the data I am trying to eval..

Been tearing my hair out trying to get it working.

thanks,

Ewan

 

//  php script sends this as a basic example...
{"vehicles":{ 4:{"id":  "4","id1327": "6","f1": "vauxhall" }}} 
 
// i do this and it hrows an error in ie8
data = eval('(' + this.responseText + ')');
 
//if i change it to this, it works o.k.
data = {"vehicles":{ 4:{"id":  "4","id1327": "6","f1": "vauxhall" }}} ;

                                  
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Asked On
2009-09-25 at 09:02:36ID24762175
Tags

eval javascript html json

Topics

JSON

,

Asynchronous Javascript and XML (AJAX)

Participating Experts
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Points
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Comments
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Answers

 

by: amit_gPosted on 2009-09-25 at 09:12:25ID: 25424423

Works fine in both FF and IE8. Must be a difference between what IE8 sees. Can you confirm that the this.responseText is same in both FF and IE8? Alert it to see.

var s = '{"vehicles":{ 4:{"id":  "4","id1327": "6","f1": "vauxhall" }}}'
 
data = eval('(' + s + ')');
 
//if i change it to this, it works o.k.
//data = {"vehicles":{ 4:{"id":  "4","id1327": "6","f1": "vauxhall" }}} ;
 
alert(data);

                                              
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by: MorcalavinPosted on 2009-09-25 at 11:08:13ID: 25425571

Make sure that the end of your json(coming from your php script) doesn't have a carriage return on it, or that any of the items do not have line feeds/carriage returns on them.

 

by: ewan69Posted on 2009-09-28 at 03:14:32ID: 25437959

Hi,

After I cleared the cache in IE it worked but only for 1 object.. if I add a "," after each object if works in firefox for 1 or more objects but in IE for 1 or more it errors with "Expected Identifier,string or number" when I try to eval it.


Amit_q, I alerted the responsetext and it matched in IE and firefox.

Morcalavin, I am not inserting any <br> but when I alert it or look using firebug it does appear as below...
{"vehicles":{ 24:{"id":  "24",
                        "f1": "vauxhall"
                         },25:{"id":  "25",
                        "f1": ""
                         },}}

Thanks for your help,
Ewan


php code:
 
	if(db_num_rows($result) > 0)
	{
		$json .= '"vehicles":{ ';
			while($result_array = db_fetch_array($result))
			{
				$newid = $result_array['Vehicle']-($idprefix.$idmin)+$base;
				$json .= $newid.':{';
				$json .= '"id":  "' . $newid . '",
				"f1": "' . htmlspecialchars($result_array['Field1']) . '"
				 },';
			}
			$json .= '}';
                                              
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by: ewan69Posted on 2009-10-19 at 04:06:24ID: 31633635

Got it working in the end...

20120131-EE-VQP-002

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