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'JSON' is undefined error in JavaScript in Internet Explorer

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走了就别回头了
走了就别回头了 2020-12-23 19:45

We are using jQuery in our application. We have used a jQuery plugin to implement JavaScript session.

It is working properly in Firefox and most Internet Explorer 8

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  • 甜味超标
    2020-12-23 19:58

    I had this error 2 times. Each time it was solved by changing the ajax type. Either GET to POST or POST to GET.

    $.ajax({
        type:'GET', // or 'POST'
        url: "file.cfm?action=get_table&varb=" + varb
    });
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  • 迷失自我
    2020-12-23 20:00

    Please add json2.js in your project . i was faced the same issue i have fixed.

    please use the link: https://raw.github.com/douglascrockford/JSON-js/master/json2.js and create new file json.js, copy the page and past into newly created file , and move that file into your web application.

    I hope it will work.

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  • 故里飘歌
    2020-12-23 20:04 
    <!DOCTYPE html>

    Otherwise IE8 is not acting right. Also you should use:

    <meta http-equiv="X-UA-Compatible" content="IE=EDGE" />
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  • 伪装坚强ぢ
    2020-12-23 20:10

    Maybe it is not what you are looking for, but I had a similar problem and i solved it including JSON 2 to my application:

    https://github.com/douglascrockford/JSON-js

    Other browsers natively implements JSON but IE < 8 (also IE 8 compatibility mode) does not, that's why you need to include it.

    Here is a related question: JSON on IE6 (IE7)

    UPDATE

    the JSON parser has been updated so you should use the new one: http://bestiejs.github.io/json3/

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  • 北荒
    2020-12-23 20:10

    Check for extra commas in your JSON response. If the last element of an array has a comma, this will break in IE

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  • 北荒
    2020-12-23 20:10

    Change the content type to 'application/x-www-form-urlencoded'

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