Button to remove unique rows and display rows with duplicate column data

Button to remove unique rows and display rows with duplicate column data

2008jackson2008jackson Posts: 38Questions: 9Answers: 0

Greetings. I require to use a button to remove all unique rows returned through AJAX JSON and display rows with duplicate column data. With code below, im unable to pick the right rows using IndexOf.

Kindly assist to fix code below.

var table = $('#table_id').DataTable({
    dom: 'PBfrtip',
    "buttons": ['copy', 'excel', {
        text: 'Show duplicates',
        action: function(row, data, index) {
            var allData = table.column(2).data().toArray();
            if (allData.indexOf(data.Reg) == allData.lastIndexOf(data.Reg)) {
                $(row).css('display', 'none');
            }
        }
    }],
    "aaData": data.d.results,
    "aoColumns": [{
            "mData": "Created",
            "render": function(data, type, row) {
                data = moment(data).format('DD-MM-YYYY HH:mm');
                return data;
            }
        },
        {
            "mData": "Family"
        },
        {
            "mData": "Reg"
        },
        {
            "mData": "Date",
            "render": function(data, type, row) {
                data = moment(data).format('DD-MM-YYYY');
                return data;
            }
        },
        {
            "mData": "Number"
        }
    ]
});

This question has an accepted answers - jump to answer

Answers

  • colincolin Posts: 12,924Questions: 0Answers: 2,201

    The second table here removes duplicate rows - you can add that code into your button,

    Colin

  • 2008jackson2008jackson Posts: 38Questions: 9Answers: 0

    Thanks Colin for the good start! Code below works to pull duplicate entries. However, i require to pull the initial entry for matching Reg and duplicate entry instead of pulling the duplicate entry only.

    Please advice.

            var table = $('#table_id').DataTable({    
                dom: 'Bfrtip',
                initComplete: function() {
                    var names = [];
                    var api = this.api();
                    var duplicate = [];
                    var avail = [];
                    api.rows().every(function(rowIdx, tableLoop, rowLoop) {
                        var data = this.data();
                        console.log(data.Reg);
                        if (names[data.Reg] === undefined) {
                            // not seen before
                            names[data.Reg] = rowIdx;
                            avail.push(rowIdx);
                        } else {
                            duplicate.push(rowIdx);
                        }
                    })
                    api.rows(avail).remove().draw();
                },
                "aaData": data.d.results,
                "aoColumns": [  
                {    
                    "mData": "Created",
                    "render": function (data, type, row) {
                    data = moment(data).format('DD-MM-YYYY HH:mm');
                    return data;}               
                },             
                {    
                    "mData": "Family"
                },             
                {    
                    "mData": "Reg"
                },             
                {    
                    "mData": "Date",
                    "render": function (data, type, row) {
                    data = moment(data).format('DD-MM-YYYY');
                    return data;}               
                },
                {    
                    "mData": "Number"
                }
                ]    
            });    
    
  • colincolin Posts: 12,924Questions: 0Answers: 2,201

    I'm sorry, but I'm not clear what functionality you're after. Could you update my test case, please, and give an example of what you would expect to happen,

    Colin

  • 2008jackson2008jackson Posts: 38Questions: 9Answers: 0

    Hi Colin, sorry for not being clear. Test case at

    http://live.datatables.net/nawudoba/1/edit

    Code is working well to pull out the duplicates however, the first instance isnt available. I need to see 3 rows for 'John Smith' i.e. rows with same name column data > 1. Appreciate the support.

  • kthorngrenkthorngren Posts: 14,147Questions: 25Answers: 3,337

    That would require a more complex loop. You can use column().data() along with toArray() to get an array of names, for example:

    var names = api.column( 0 ).data().toArray();
    

    Then you can use the rows().every() to loop through all the rows and see if the name is in the array more than once. This SO thread has some techniques for this. Choose the one that best fits your solution.

    Kevin

  • 2008jackson2008jackson Posts: 38Questions: 9Answers: 0

    Hi Kevin, Appreciate the feedback. I've now been able to identify the unique column values to remove rows with var difference. Guess i need the row IDs for these values to remove the rows. Could you pls guide me to fetch the corresponding IDs to remove rows?

                initComplete: function() {
                    var names = [];
                    var api = this.api();
                    var duplicate = [];
                    var avail = [];
    
                    api.rows().every(function(rowIdx, tableLoop, rowLoop) {
                        var data = this.data();
                        if (names[data.Reg] === undefined) {
                            names[data.Reg] = rowIdx;
                            avail.push(data.Reg);
                        } else {
                            duplicate.push(data.Reg);
                        }
                    })
                    console.log(avail);
                    console.log(duplicate);     
                    var b1 = new Set(duplicate);
                    var difference = [...new Set(avail.filter(x => !b1.has(x)))];               
                    console.log(difference);
                    api.rows(<<DIFFERENCE IDS>>).remove().draw();
                },
    
  • kthorngrenkthorngren Posts: 14,147Questions: 25Answers: 3,337

    Sorry I meant something more like this:
    http://live.datatables.net/nawudoba/4/edit

    Kevin

  • 2008jackson2008jackson Posts: 38Questions: 9Answers: 0

    Hi Kevin,

    Your example works perfect for an array of arrays. However, im working with an array of objects. Refer example at http://live.datatables.net/nawudoba/5/edit

    TypeError: Cannot read property 'name' of undefined.

    Unable to pick the data field for name and filter values to remove uniques. Appreciate the support.

  • colincolin Posts: 12,924Questions: 0Answers: 2,201

    Can you update Kevin's test case with your data, so we can see the problem, please.

    Colin

  • 2008jackson2008jackson Posts: 38Questions: 9Answers: 0

    Hi Colin,

    Updated case available at http://live.datatables.net/nawudoba/5/edit with array of objects.

  • kthorngrenkthorngren Posts: 14,147Questions: 25Answers: 3,337
    Answer ✓

    The problem is we are removing the rows in the loop. Instead we need to keep track of the row indexes in the loop then use rows().remove() after the loop with the indexes.
    http://live.datatables.net/nawudoba/7/edit

    Kevin

  • 2008jackson2008jackson Posts: 38Questions: 9Answers: 0

    Thankyou Kevin! worked like a charm!

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