用jQuery对JSON排序

Question

How do i sort this JSON object by first_name?

{
    1  :{user_id:1, first_name:"first_name1", last_name:"lastname1", email:"user1@test.com"},
    7  :{user_id:7, first_name:"user2", last_name:"test2", email:""}, 
    72 :{user_id:72, first_name:"testing343", last_name:"", email:""},
    246:{user_id:246, first_name:"aaa", last_name:"ssss", email:""}
}

Answer 1

First of all, your JSON string is invalid. Clear that up first, you are forced to eval() the string in its current form, JSON.parse() won't work.

---

Object keys are unordered by spec. You can't statically "sort" key names and freeze them in an object. But you certainly can sort the keynames and operate in that order on their values.

For instance:

var json = '{1:{user_id:1, first_name:"first_name1", last_name:"lastname1", email:"user1@test.com"}, 7:{user_id:7, first_name:"user2", last_name:"test2", email:""}, 72:{user_id:72, first_name:"testing343", last_name:"", email:""}, 246:{user_id:246, first_name:"aaa", last_name:"ssss", email:""}}';

json = eval( json );

Object.keys( json ).sort(function( a,b ) {
    return json[a].first_name.localeCompare( json[b].first_name );
}).forEach(function( key ) {
    console.log( json[key].first_name );
});

That code assumes the availabilty of an ES5 enabled JS engine or any kind of ES5-shim library.

Answer 2

Write your JSON object like the following:

data = [{user_id:1, first_name:"first_name1", last_name:"lastname1", email:"user1@test.com"}, {user_id:7, first_name:"user2", last_name:"test2", email:""}, {user_id:72, first_name:"testing343", last_name:"", email:""}, {user_id:246, first_name:"aaa", last_name:"ssss", email:""}]

So that it's now an array. Then you can call .sort() on it.

data.sort(function(a, b) {
    var x = a.first_name.toLowerCase(), y = b.first_name.toLowerCase();
    return x < y ? -1 : x > y ? 1 : 0;
});

Answer 3

Why do you want to sort an object?

You'll want to loop this object into an array, and then sort the array. http://jsfiddle.net/z2xsC/ For example:

//loop into array
var arr = [];
for( var key in data ){
  if( data.hasOwnProperty( key ) ){
    arr.push( data[key] );
  }
}

//now, sort your array
arr.sort( function(a,b) { 
  var nameA=a.first_name.toLowerCase(),
      nameB=b.first_name.toLowerCase();

  if (nameA < nameB){ 
    return -1; 
  } else if (nameA > nameB){ 
    return 1
  } else { 
    return 0
  }
});