Get data from ajax POST call

Get data from ajax POST call

DawidGrzejekDawidGrzejek Posts: 7Questions: 4Answers: 0


I've problem with DataTable to read data from my ajax call.

Originally I was populating my Table like so:

  type: "POST",
  url: 'formularze_dane.php',
  data: {login: val1, type: 'user_privileges'},
  success: function(result){
    const table = document.getElementById("userPrivilegesTableTBody");
    for (let i = 0; i < result.length; i++) {
      let counter = 0;
      let row = table.insertRow();
      for(key in result[i]){
        let val2 = row.insertCell(counter);
        val2.innerHTML = result[i][key];

And everything was working just fine. ButI wanted to try datatables, so I tried:

  ajax: {
    type: "POST",
    url: 'formularze_dane.php',
    data: {login: val1, type: 'user_privileges'}

As you can see below, table is created, column names are also loaded, but cells values are not

Debugger also say so:

Information about 1 table available
Data source:    Ajax
Processing mode:    Client-side
Draws:  1
Columns:    3
Rows - total:   0
Rows - after search:    0
Display start:  0
Display length: 10

I log object from ajax call into console it's structure below:


And last, error that it gives:

Uncaught TypeError: Cannot read properties of undefined (reading 'length')
    at jquery.dataTables.js:4834:26
    at Object.callback [as success] (jquery.dataTables.js:3952:4)
    at j (jquery.min.js:2:27295)
    at Object.fireWith [as resolveWith] (jquery.min.js:2:28108)
    at x (jquery.min.js:4:22061)
    at XMLHttpRequest.b (jquery.min.js:4:25980)

This question has accepted answers - jump to:


  • colincolin Posts: 14,612Questions: 1Answers: 2,494
    Answer ✓

    data shouldn't be under the ajax call, it should be - please see example here,


  • kthorngrenkthorngren Posts: 17,724Questions: 25Answers: 4,204
    Answer ✓

    You might need to use ajax.dataSrc to point to the row data. See the second example in the docs and also the Ajax docs.


  • DawidGrzejekDawidGrzejek Posts: 7Questions: 4Answers: 0
    edited November 2022

    You're right. Since I had a problem with reading .json, I've place it into success function, like so:

          type: "POST",
          url: 'data.php',
          data: {login: '', type: 'get_all_users'},
          success: function(result){
              search: true,
              order: [
                [1, "asc"], 
                [3, "asc"]
              "aaData": result, 
              "columns": [
                data: null,
                defaultContent: "<input type='checkbox' class='radio' value='checbox_value' name='fooby' />",
              { "data": "firstname", title: "Name" },
              { "data": "lastname", title: "Surname"  },
              { "data": "login", title: "ID"  }

    And I'ts working just fine.

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