Parsing JSON with jquery

Convert an object to a string using a native JSON object

[JavaScript] View plaincopy

1. var jsobj = {};
2. Jsobj.testarray = [1,2,3,4,5];
3. Jsobj.name = ' CSS3 ';
4. Jsobj.date = ' 8 May, 2011 ';
5. var str = json.stringify (jsobj);
6. alert (str);

Convert from JSON string to object

[JavaScript] View plaincopy

1. var jsobj = {};
2. Jsobj.testarray = [1,2,3,4,5];
3. Jsobj.name = ' CSS3 ';
4. Jsobj.date = ' 8 May, 2011 ';
5. var str = json.stringify (jsobj);
6. var str1 = json.parse (str);
7. alert (STR1);

Ext.: http://blog.csdn.net/starrexstar/article/details/8083259

First clear 2 concepts such as:

JSON string:

var str1 = ' {' name ': ' Deyuyi ', ' sex ': ' Man '} ';

JSON object:

var str2 = {"Name": "Deluyi", "Sex": "Man"};

It is easy to understand:

JSON objects are formats that can be manipulated directly using jquery, such as the ability to point out properties (methods) in C # with objects (class names).

The JSON string is just a string, a whole, without intercepting the data stored in it, cannot be used directly, unless you only want to alert () him; JSON string to JSON object

To use the above str1, you must first convert to a JSON object using the following method: A:eval function

The Eval function can directly convert a string that is inherently compliant or approximately in JSON format to a JSON object, using the following methods:

eval (' (' + str + ') '); Where Str is the string that satisfies the description of this title

    Convert from JSON string to JSON object

    var str= ' {' name ': ' John '} ';    var obj = eval (' (' + str + ') ');     alert (obj.name);    var str2= "{' name ': ' John '}";    var obj2 = eval (' (' + str2 + ') ');     alert (obj2.name);    var str3= "{name: ' John '}";    var obj3 = eval (' (' + STR3 + ') ');     alert (obj3.name);

The result "John" will be output.

The Eval method can convert the following standard and non-standard format strings:

   var str= "{' name ': ' John '}";   var str2= ' {' name ': ' John '} ';   var str3= "{name: ' John '}";

See the download package in this example: jquerydemo1.html B:parsejson function

Another function that converts a standard string to a JSON object is Parsejson (), using a method such as Jquery.parsejson (str)//Where STR is the string that satisfies this title description

    Convert from JSON string to JSON object

    var str= ' {' name ': ' John '} ';    var obj = Jquery.parsejson (str)    alert ("1" + obj.name);

The result "John" will be output.

This method only supports the standard format: var str= ' {' name ': ' John '} ';

See the download package in this example: jquerydemo2.html C:json.parse function

There is also a function that converts a standard string to a JSON object that is Json.parse (), used in such a way as json.parse (str)//Where STR is the string that satisfies the description of this title

        var str = ' {' name ': ' Mady ', ' Age ': ' "} ';        var obj = json.parse (str);        alert (obj.name);

The result "John" will be output.

This method only supports the standard format: var str= ' {' name ': ' John '} ';

See the download package in this example: jquerydemo3.html

The above results are consistent, all output names, such as:

Special Note: If obj is originally a JSON object, then using the eval () function after conversion (even if multiple conversions) is a JSON object, but there is a problem with the Parsejson () function (throwing a syntax exception). Second, convert the JSON object to a string

You can use tojsonstring () or global method json.stringify () to convert a JSON object to a JSON string.

For example:

var last=obj.tojsonstring (); Convert a JSON object to a JSON character

Or

var last=json.stringify (obj); Convert a JSON object to a JSON character

alert (last); parse read JSON

When we convert a string to a JSON object in various ways, we parse him.

As the above example:

      var str2 = {"Name": "Mady", "Sex": "Man"};

You can read it like this:

      alert (str2.name);//and C # go straight to the point ...

Eject "Mady".

The JSON we encounter is rarely so simple, such as a bit more complex JSON objects such as:

      var str={"Getuserpostbyidresult": {"Age": "$", "ID": "2server", "Name": "Mady"}};

Parsing by:

      Alert (str. Getuserpostbyidresult.name);//I'll do it a few more times.

Pop up: "Mady".

A little more complicated like:

      var data= "{root: [{' name ': ' 6200 ', ' value ': ' 0 '}, {' name ': ' 6101 ', ' value ': ' Xa '}, {' name ': ' 6102 ', ' value ': ' Beijing '}, {' Name ': ' 6103 ', ' value ': ' Haerbin '}]} ";

If you want to be singled out, parse by:

      alert (dataobj.root[0].name);

Eject: "6200".

If you want to pick a group, parse it by:

      $.each (Dataobj.root, function (index, item) {            $ ("#info"). Append (                    "<div>" +index+ ":" + item.name + "</ Div> "+                     " <div> "+index+": "+ item.value +" </div>
Where this "#info" is the ID of a div. Input results such as:
See the download package in this example: jquerydemo4.html
Note: In this example, if you want to use a different conversion function, change the single quotation mark in the string to double quotation marks, and the inner number to single quotation marks.
This article all code: click to download
Ext.: http://www.cnblogs.com/madyina/p/3448518.html
Parsing JSON with jquery