Answers

• kthorngren Posts: 20,425Questions: 26Answers: 4,794

  August 2022

  <---- what show I put here ?

  Depends on what is returned from the server/firebase. Use the browser's network inspector tool to grab a sample to post here so we can take a look.

  The Ajax docs explain the ajax.dataSrc option. See the last example in the ajax.dataSrc docs for a function example.

  Not sure if you will to use a function. If your row data is in an array as described above then you just need to point to the array. If its a different structure then you will need to manipulate to a structure Datatables supports.

  Kevin
• matcha125 Posts: 6Questions: 3Answers: 0

  August 2022

  i think my problem is ,I don't know where should I put converter from obj in obj(originally JSON from firebase) to arr in obj(which datatable required)
  any suggestion ?
• allan Posts: 61,972Questions: 1Answers: 10,160 Site admin

  August 2022 Answer ✓

  The JSON being returned from Firebase is an object containing objects, whereas DataTables expects the outer part to be an array. So ajax.dataSrc can be used as a function to perform that transform:

      ajax: {
        url: 'https://io-testbase1.firebaseio.com/Mold.json',
        dataSrc: function (obj) {
          return Object.values(obj);
        }
      },
  

  Or if you prefer a fat arrow function:

      ajax: {
        url: 'https://io-testbase1.firebaseio.com/Mold.json',
        dataSrc: obj => Object.values(obj)
      },
  

  I've set up a little example here.

  Note that there is an inner Record object in each row's object. If you want to access that for the row rendering, you'd need to again create a loop over that object to create an inner array (unless the keys were always going to be the same - which they aren't in this case).

  Allan
• matcha125 Posts: 6Questions: 3Answers: 0

  August 2022

  Thank you so much ,allan . now I can render table from firebase
  ,by the way I try to open your _**example here **_but It can't open (404 Not found) .

  about Record obj. could you please explain more (I'm absolutely beginner in programming) ,
  Should I create a loop inside dataSrc function by using "obj.Record" to create inner array first then return them all together to dataSrc? ,

  matcha
• allan Posts: 61,972Questions: 1Answers: 10,160 Site admin

  August 2022

  I really need to fix that link thing. You browser is probably changing the link to https:// which will cause an error. It should be http:// at the moment.

  Should I create a loop inside dataSrc function by using "obj.Record" to create inner array first then return them all together to dataSrc? ,

  You'd need something like:

  dataSrc: function (data) {
    data = Object.values(data);
  
    for ( var i=0; i<data.length; i++ ) {
      data.Record = ...
    }
  }
  

  I don't just want to give you the answer - hopefully you'll be able to work out what you need in the ... based on what line 2 is doing. But if you struggle, let us know.

  Allan
• matcha125 Posts: 6Questions: 3Answers: 0

  August 2022

  Hi , allan . I just figured out your task . It work fine . But I just would like to know , Is it correct or any better way to coding , Thank you again

                       dataSrc: function (data) {
                                data = Object.values(data);
                                var CollectRecord = []
  
                                  for ( var i=0; i<data.length; i++ ) {
                                         CollectRecord.push(Object.values(data[i].Record))
                                    }            
                                   return CollectRecord.flat()
                                }                                
  
• allan Posts: 61,972Questions: 1Answers: 10,160 Site admin

  August 2022

  Looks good. If you wanted to save a line of code or two you could use Array.prototype.map, but I recon that looks okay and is easy to read as it is.

  Allan
• m98jk Posts: 1Questions: 0Answers: 0

  April 2023

  I tried many solutions but the best one I found is this :

  var table = $('#example').DataTable({
      columns: [
          { data: 'name' },
          { data: 'age' },
          { data: 'email' }
      ]
  });
  
  var ref = firebase.database().ref('users');
  ref.on('value', function (snapshot) {
      var data = [];
      snapshot.forEach(function (childSnapshot) {
          var childData = childSnapshot.val();
          data.push({
              "name": childData.name,
              "age": childData.age,
              "email": childData.email
          });
      });
      table.clear();
      table.rows.add(data);
      table.draw();
  });
  
• allan Posts: 61,972Questions: 1Answers: 10,160 Site admin

  April 2023

  Looks good! I wonder if it can be shortened a little:

  ref.on('value', function (snapshot) {
    table
      .clear()
      .rows.add(snapshot.val())
      .draw();
  });
  

  The Firebase docs indicate that snapshot.val() would basically return an array similar to what you are building in the forEach. I haven't used Firebase, so I'm not certain, but it might make things a little easier.

  Allan