Javascript | JSON and ARRAY

Question

May be you can help me with my task. I have a JSON string:

{
 "chats":[
 {"id":"1","time":"13:02", "from_id":"2692","text":"1","to_id":"62"},
 {"id":"2","time":"13:48", "from_id":"62","text":"Hello!","to_id":"2692"},
 {"id":"12","time":"15:47", "from_id":"2692","text":"3","to_id":"62"},
 {"id":"13","time":"15:48", "from_id":"62","text":"4","to_id":"2692"},
 {"id":"30","time":"08:57", "from_id":"2692","text":"To me","to_id":"62"},
 {"id":"31","time":"09:28", "from_id":"66","text":"From user1","to_id":"2692"},
 {"id":"32","time":"09:29", "from_id":"66","text":"From user1","to_id":"2692"},
 {"id":"32","time":"09:29", "from_id":"2692","text":"From user1","to_id":"66"}
 ],
 "lastid": "32"
}
var my_id = 2692 /*My chats*/
/*Success JSON request below*/
onSuccess: function(m){
 var messages = [];
 var chanels = [];
 var chanels_u = [];
 for(var i=0; i<m.chats.length;i++){ 
 if (my_id != '' && m.chats[i].from_id != parseInt(my_id)){
 chanels.push(m.chats[i].from_id);
 }
 }
 chanels_u = chanels.unique(); /*We get id's: 62,66*/
}

My Question:

How can I create a new arrays dynamically (2 for this example for: 62 and 66) and push messages?

To 1 (62):

{"id":"1","time":"13:02", "from_id":"2692","text":"1","to_id":"62"},
{"id":"2","time":"13:48", "from_id":"62","text":"Hello!","to_id":"2692"},
{"id":"12","time":"15:47", "from_id":"2692","text":"3","to_id":"62"},
{"id":"13","time":"15:48", "from_id":"62","text":"4","to_id":"2692"},
{"id":"30","time":"08:57", "from_id":"2692","text":"To me","to_id":"62"}

To 2 (66):

{"id":"31","time":"09:28", "from_id":"66","text":"From user1","to_id":"2692"},
{"id":"32","time":"09:29", "from_id":"66","text":"From user1","to_id":"2692"},
{"id":"32","time":"09:29", "from_id":"2692","text":"From user1","to_id":"66"}

Thanks!

• Shalom Craimer: You might want to look into something called "nested loops". It's been an invaluable tool during my career, and I hope it helps you too!
• Pastor Bones: @user889349 - What is the criteria for the two separate arrays? You can loop the JSON string and use if/else to determine which array the data should go to then just push() to that array.

Answer 1

You are already identifying your chat ID and pushing it into the chanels array in your code:

if (my_id != '' && m.chats[i].from_id != parseInt(my_id)){
 chanels.push(m.chats[i].from_id);
}

You are also identifying unique IDs in your code:

chanels_u = chanels.unique();

All you need to do is locate your chats from the JSON object by comparing them to the IDs in chanels_u and if there's a match, push the text field to the messages array. This is should be close to what you require:

for(var i=0; i<m.chats.length;i++){ 
 for(var j=0; j<chanels_u.length;j++){
 if (my_id !== '' && m.chats[i].from_id === chanels_u[j]){
 messages.push(m.chats[i].text);
 }
 }
}

• XTRUST.ORG: ... chanels_u[j] Where is a j defined?
• Abbas: Oops. It should be in the second loop, I will update my response.

Answer 2

this will do what you want, i believe - create a new object with keys of the to_id and from_id in a way that allows you to loop them whichever way you want. it would probably make more sense to have a toUser and fromUser objects that you can loop independently and cross reference as you build the replies but it's trivial to do so.

var chats = {
 "chats":[
 {"id":"1","time":"13:02", "from_id":"2692","text":"1","to_id":"62"},
 {"id":"2","time":"13:48", "from_id":"62","text":"Hello!","to_id":"2692"},
 {"id":"12","time":"15:47", "from_id":"2692","text":"3","to_id":"62"},
 {"id":"13","time":"15:48", "from_id":"62","text":"4","to_id":"2692"},
 {"id":"30","time":"08:57", "from_id":"2692","text":"To me","to_id":"62"},
 {"id":"31","time":"09:28", "from_id":"66","text":"From user1","to_id":"2692"},
 {"id":"32","time":"09:29", "from_id":"66","text":"From user1","to_id":"2692"},
 {"id":"32","time":"09:29", "from_id":"2692","text":"From user1","to_id":"66"}
 ],
 "lastid": "32"
};
var newchats = {}, my_id = 2692;
chats.chats.each(function(chat) {
 if (!chat.id || !chat.id.length || chat.from_id == my_id)
 return;
 newchats["from" + chat.from_id] = newchats["from" + chat.from_id] || [];
 newchats["from" + chat.from_id].push(chat);
 newchats["to" + chat.to_id] = newchats["to" + chat.to_id] || [];
 newchats["to" + chat.to_id].push(chat);
});
console.log(newchats, JSON.encode(newchats));

see on jsfiddle http://jsfiddle.net/dimitar/7j2SN/, outputs:

{
 "from62": [{
 "id": "2",
 "time": "13:48",
 "from_id": "62",
 "text": "Hello!",
 "to_id": "2692"},
 {
 "id": "13",
 "time": "15:48",
 "from_id": "62",
 "text": "4",
 "to_id": "2692"}],
 "to2692": [{
 "id": "2",
 "time": "13:48",
 "from_id": "62",
 "text": "Hello!",
 "to_id": "2692"},
 {
 "id": "13",
 "time": "15:48",
 "from_id": "62",
 "text": "4",
 "to_id": "2692"},
 {
 "id": "31",
 "time": "09:28",
 "from_id": "66",
 "text": "From user1",
 "to_id": "2692"},
 {
 "id": "32",
 "time": "09:29",
 "from_id": "66",
 "text": "From user1",
 "to_id": "2692"}],
 "from66": [{
 "id": "31",
 "time": "09:28",
 "from_id": "66",
 "text": "From user1",
 "to_id": "2692"},
 {
 "id": "32",
 "time": "09:29",
 "from_id": "66",
 "text": "From user1",
 "to_id": "2692"}]
}

Answer 3

I guess, JSON is invalid. You missed to close the JSON properly.

{
 "chats": [
 {
 "id": "1",
 "time": "13:02",
 "from_id": "2692",
 "text": "1",
 "to_id": "62"
 },
 {
 "id": "2",
 "time": "13:48",
 "from_id": "62",
 "text": "Hello!",
 "to_id": "2692"
 },
 {
 "id": "12",
 "time": "15:47",
 "from_id": "2692",
 "text": "3",
 "to_id": "62"
 },
 {
 "id": "13",
 "time": "15:48",
 "from_id": "62",
 "text": "4",
 "to_id": "2692"
 },
 {
 "id": "30",
 "time": "08:57",
 "from_id": "2692",
 "text": "To me",
 "to_id": "62"
 },
 {
 "id": "31",
 "time": "09:28",
 "from_id": "66",
 "text": "From user1",
 "to_id": "2692"
 },
 {
 "id": "32",
 "time": "09:29",
 "from_id": "66",
 "text": "From user1",
 "to_id": "2692"
 }
 ]
}

Use JSONLINT to validate your data. You can update(get/set) this array dynamically as you wish.

var msgBox={"chats":[]};
var msg={"id":1,"time":(new Date()).getTime(),"from_id":"","text":"","to_id":""};
var info={ // whole JSON data }
var chats=info['chats'];
for(m in chats){
 console.log(chats[m].text) // will display the text
 console.log(chats[m].time) // will display the time of chat 
 chat[m].to_id=32424; // you can modify the to_id value
}

• XTRUST.ORG: Maybe. It works in my code. But it isn't right answer for my queston. Thanks :)

Answer 4

You can make chanels and object instead of array.

onSuccess: function(m){
 var messages = [];
 var chanels = {};
 var chanels_u = [];
 for(var i=0; i<m.chats.length;i++){ 
 if (my_id != '' && m.chats[i].from_id != parseInt(my_id)){
 var fromID = m.chats[i].from_id;
 if(!chanels[fromID]){
 chanels[fromID] = [];
 }
 chanels[fromID].push(m.chats[i]);
 }
 }
 //chanels_u = chanels.unique(); /*We get id's: 62,66*/
}