Question

-1

Jquery - Uncaught TypeError: Cannot use 'in' operator to search for '324' in

rated 0 times [ 2] [ 3] / answers: 1 / hits: 117467 / 11 Years ago, thu, august 29, 2013, 12:00:00

I'm trying to send a Get request by ajax and output json data that is returned by server in html.

But, I got this error.

Uncaught TypeError: Cannot use 'in' operator to search for '324' in 

[{"id":50,"name":"SEO"},{"id":22,"name":"LPO",}]

This is my code that sends a Get request to php file by ajax.
When I use $.each method, it get the error that I showed in the above.

parentCat.on('change', function(e){

    parentCatId = $(this).val();



    $.get(

        'index.php?r=admin/post/ajax',

        {"parentCatId":parentCatId},

        function(data){                     

            $.each(data, function(key, value){

                console.log(key + ":" + value)

            })

        }

    )



})

This is my PHP code that returns query result in json format.

public function actionAjax(){



    $parentCatId=$_GET['parentCatId'];



        $catData = Category::getTargetCategoryData($parentCatId);

        

        echo CJSON::encode($catData);

        Yii::app()->end();

    

}

json data outputted by this php is like this.

[{"id":50,"name":"SEO"},{"id":22,"name":"LPO",}]

How can this problem be fixed?

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answered 11 Years ago rianna · Accepted Answer

You have a JSON string, not an object. Tell jQuery that you expect a JSON response and it will parse it for you. Either use $.getJSON instead of $.get, or pass the dataType argument to $.get:

$.get(

    'index.php?r=admin/post/ajax',

    {parentCatId:parentCatId},

    function(data){                     

        $.each(data, function(key, value){

            console.log(key + : + value)

        })

    },

    'json'

);