eval – json – too many characters

@BassMasterFlashMay 16.2006

I am generating a json structured array with php. Then, I use the XMLHttpRequest object to call in the string. Then when the string in loaded in , I eval it, so that I can parse through it with javascript. Problem here is that when I eval the string, it cuts off everything after 254 characters. I did some research on this, and it states some bugs on this for netscape 2.0. I am using netscape 8 for testing. Does anyone know of a workaround? or any other solution?

[CODE]var json = eval(‘(‘+this.req.responseText+’)’);[/CODE]

‘this.req.responseText’ being my string generated from PHP. If i dont eval it, I get all my of my string. But, I have to eval it to be able to parse it in js.

Thanks
-Trey

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JavaScript

@phpnoviceMay 16.2006 — #What does the content of the string look like?

@UltimaterMay 16.2006 — #Eval should be avoided. I'd recommand using the Function constructor.

e.g.

<i>
 </i>&lt;script type="text/javascript"&gt;
 var str="globalVarable="hi there!";";
 var tmpFunc=Function(str);
 tmpFunc();
 alert(globalVarable)
 &lt;/script&gt;

simply replace [color=blue]str[/color] with [color=blue]this.req.responseText[/color] and adjust the contents to be treated as the body of the anonymous function then there should be no issues.

FYI the following three lines are interchangable:

<i>
 </i>function alertMe(a){alert(a)};alertMe("hi")
 alertMe=function(a){alert(a)};alertMe("hi")
 alertMe=Function("a","alert(a)");alertMe("hi")

as well as these three:

<i>
 </i>function alertMe(){alert("hi")};alertMe()
 alertMe=function(){alert("hi")};alertMe()
 alertMe=Function("alert("hi")");alertMe()

@BassMasterFlashauthorMay 16.2006 — #Problem - Eval would only parse 254 characters. The existing code was:

[CODE]var json = eval('('+this.req.responseText+')');[/CODE]

The Fix:

[CODE]var json=new Function("return " + this.req.responseText)();[/CODE]

Thanks Ultimater for your help.

-Trey

eval – json – too many characters

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