Trying to populate empty table with onClick

Trying to populate empty table with onClick

jasonshavejasonshave Posts: 6Questions: 2Answers: 0

Is it possible to populate an empty table initialized after loading the document? I'm struggling to understand what I'm doing wrong. Here is my question for reference:

https://stackoverflow.com/questions/52748198/ajax-call-to-dynamically-build-datatable-from-asp-net-core-web-api

Using the following code I can see my console.log return the json data from my ajax call but the table remains empty. My HTML is pretty basic (open/close table tag).

    function GetActivityLog(pk, rk, cn) {
        $.ajax({
            url: '/Nodes?handler=ActivityLog' + '&PartitionKey=' + pk + '&RowKey=' + rk + '&ComputerName=' + cn
        }).done(function (response) {
            console.log(response)
            $('#tblActivityLogs').DataTable({
                data: response
            });
        });
    }

Answers

  • kthorngrenkthorngren Posts: 3,680Questions: 19Answers: 823

    I think response is a JSON string not a Javascript array. You probably need something like this before your Datatable init:
    response = JSON.parse(response);

    Kevin

  • jasonshavejasonshave Posts: 6Questions: 2Answers: 0

    Very nice....and closer. I think my data might need some massaging though. I'm now getting unexpected token. Redacted content is a GUID by the way.

  • kthorngrenkthorngren Posts: 3,680Questions: 19Answers: 823
    edited October 11

    Since your data is object based you need to use columns.data to define your columns.

    Unexpected token

    Maybe you don't need to use JSON.parse() and just need the columns.data option.

    Kevin

  • jasonshavejasonshave Posts: 6Questions: 2Answers: 0
    edited October 12

    Updated with suggested columns. I also set the eTag to null as this was causing the unexpected token error. I don't get any errors in the console but the table is still blank. Does it need to be redrawn or reloaded?

            function GetActivityLog(pk, rk, cn) {
                $.ajax({
                    url: '/Nodes?handler=ActivityLog' + '&PartitionKey=' + pk + '&RowKey=' + rk + '&ComputerName=' + cn
                }).done(function (response) {
                    console.log(response)
                    $('#tblActivityLogs').DataTable({
                        data: response,
                        columns: [
                            { "data": "computerName" },
                            { "data": "domainName" },
                            { "data": "eTag" },
                            { "data": "entryType" },
                            { "data": "eventid" },
                            { "data": "logName" },
                            { "data": "Message" },
                            { "data": "partitionKey" },
                            { "data": "rowKey" },
                            {"data":"timestamp"}
                        ]
                    });
                });
            }
    

    I also tried a dataTables.ajax.reload() and this gives me a new error suggesting data is null. I'm wondering if this is because my table is drawn initially without a data tag and without any data at all? It's a bit of a catch22 though. I don't know what the data reference will be until the user clicks on the button to pass the parameters to the function so I can fetch the data...

  • jasonshavejasonshave Posts: 6Questions: 2Answers: 0
    edited October 12

    Getting closer...I had to remove the other script block which built the blank table. I guess the properties (including the data value) is defined as it's created and modifying it afterward doesn't fly. I can see the table now when the onClick fires. The table won't update though if I click on another row. I'm thinking I need to clear or refresh...I'll ask a separate question for that.

  • kthorngrenkthorngren Posts: 3,680Questions: 19Answers: 823

    ajax.reload()

    This only works for ajax loaded tables.

    I'm wondering if this is because my table is drawn initially without a data tag and without any data at all? I

    You can initialize a blank table without a data option. If you want to reinitialize the table then you either need to use destroy or use the destroy() API. You should get an error otherwise when trying to initialize the table a second time.

    You can also initialize a blank table then use rows.add() and draw() to add the new rows without destroying it. Probably a better way to go.

    Kevin

  • kthorngrenkthorngren Posts: 3,680Questions: 19Answers: 823

    The table won't update though if I click on another row. I'm thinking I need to clear or refresh...I'll ask a separate question for that.

    Are you trying to do something like this?
    https://datatables.net/blog/2016-03-25

    Kevin

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