javascript JSON.parse result problem on empty array with localStorage
Question
I initialized a localStorage variable with the following function:
if (!localStorage["store"]) {
var aaa = new Array();
localStorage["store"] = JSON.stringify(aaa);
}
It seems to work ok, but when I try use that array in order to add elements with the following code:
var one_stat = new Array( s1, s2 , resultat );
var statistics = JSON.parse(localStorage["store"]);
statistics.push( one_stat );
localStorage["store"] = JSON.stringify(statistics);
I get the following error:
Uncaught TypeError: Object [] has no method 'push'
I am using Google Chrome 10.0.648.151 on Ubuntu.
Does anyone know what I might be doing wrong?
Thanks.
2 answers
solution1
0 2011-03-24 19:03:19
Essentially, a JSON object is not an array and the push method only works with arrays in javascript. Is there a reason why you're not using the object literal method to add the array data to your JSON object?
eg
statistics.variable = one_stat;
solution2
0 ACCPTED 2011-03-24 22:56:48
I tried the following code and it worked as expected:
<!DOCTYPE html>
<html>
<head>
<title>Prova</title>
</head>
<body>
<script type="text/javascript">
if (!localStorage["stor"] ) {
localStorage["stor"] = JSON.stringify([]);
}
var aa = JSON.parse( localStorage["stor"] ) ;
console.log( aa ) ;
aa.push( [ 1 , 2, 2 ] ) ;
localStorage["stor"] = JSON.stringify( aa ) ;
</script>
I am trying, man
</body>
</html>
It seems it has something to do with Prototype library, which I am using. Have a look at this: JSON.stringify() array bizarreness with Prototype.js
I still haven't worked out a solution, but I believe I on the right path.
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