Setting http header for ajax

shandy.sawyer@promedica.org · June 4

Is there a way to set ajax http header info similar to setting the url?

My use case is that I don't want to call out to ajax to load data until after user input. From what I've found in the documentation:

"As of DataTables 2, this option can be given as an empty string to indicate to DataTables that it is an Ajax sourced table, but not to make an Ajax request until a URL is given, which can be done with ajax.url().load(). This can be useful if you are using DataTables to display search results obtained by Ajax, for example."

// setup blank table
const myTable = $('#myTable').DataTable({
    serverSide: false,
    ajax: "", // allow ajax to be set later
    columns: [
        ...
    ]
});

// now load after user input
$('button').on('click', function () {
    const id = $("#search").val();
    // fails because no api key in the header
    myTable.ajax.url(`${apiUrl}/Payments/${id}`).load();
});

However I need to be able to set the http header in the ajax request so I can pass an API Key to the API endpoint I am calling out to. I have seen people an ajax call separate from the DataTable api:

$('button').on('click', function () {
    const id = $("#search").val();
    $.ajax({
        url: `${apiUrl}/Payments/${id}`,
        headers: getApiHeaders(),
        success: function (data) {
            myTable.clear();
            myTable.rows.add(data).draw();
        },
        error: function () {
            alert("There was an error");
        }
    });
});

Is that the only way and proper way to do this?

kthorngren · June 4

Possibly you can use jQuery ajaxSetup to define the default ajax settings. The ajax option uses jQuery ajax.

Kevin

shandy.sawyer@promedica.org · June 4

@kthorngren I tried adding:

$.ajaxSetup({
    headers: getApiHeaders(),
});

I can confirm getApiHeaders() works because I use it in other places to initialize other DataTables normally

But, in this case I get this error after table.ajax.url().load() is called in my code and the asp.net core api endpoint (HttpGet) is hit and returns data:

Uncaught TypeError: Cannot read properties of undefined (reading 'length')
at eval (jquery.dataTables.mjs:7723:28)
at Object.callback [as success] (jquery.dataTables.mjs:3924:3)
at fire (jquery.js:3213:31)
at Object.fireWith [as resolveWith] (jquery.js:3343:7)
at done (jquery.js:9617:14)
at XMLHttpRequest.eval (jquery.js:9878:9)

kthorngren · June 4

table.ajax.url().load()

Did you define the URL string with a standalone ajax.url() call or as part of the above statement?

I created this simple test case and it works. Use the browser's network inspector to see the defined Authorization header is in the request:
https://live.datatables.net/socirone/62/edit

Can you post a link to a test case showing the issue so we can help debug?
https://datatables.net/manual/tech-notes/10#How-to-provide-a-test-case

Kevin

allan · June 5

You can give ajax as an object and just set the url property to an empty string. Then use ajax.url() to set the URL to what you want - e.g.:

let table = new DataTable('#example', {
    ajax: {
        url: '',
        dataSrc: 'data',
        headers: {
            Authorization: 'my-key'
        }
    },
    columns: [
        { data: 'name' },
        { data: 'position' },
        { data: 'office' },
        { data: 'extn' },
        { data: 'start_date' },
        { data: 'salary' }
    ]
});
 
setTimeout(() => {
    table.ajax.url('/ajax/objects.txt').load();
}, 1000);

I created this test case: https://live.datatables.net/socirone/64/edit .

It is worth me highlighting that you must specify ajax.dataSrc at the moment, if you take this approach. That's an error that I've just committed a fix for, but hopefully it is no big problem to add that property for the moment.

Allan

shandy.sawyer@promedica.org · June 5

Need to clarify, I was using a template with preinstalled DataTables files. Turns out this was version 1.13.5. Moving to 2.3.1 allows a much more straight forward approach of specifying a blank ajax url and any headers (blank url failed in 1.13.5):

// initial setup of empty table
$('#myTable').DataTable({
    serverSide: false,
    ajax: {
        url: '',
        dataSrc: '',
        headers: getApiHeaders()
    },
    columns: [
        ...
    ]
});

$('#search').on('click', function () {
    const id = $("#search").val();
    const endPointUrl = `${apiUrl}/Payments/${id}`;
    masterTable.ajax.url(endPointUrl).load();
});

shandy.sawyer@promedica.org · June 5

For some reason your responses didn't pop up until after I commented again. Thank you @allan and @kthorngren for the follow ups!

allan · June 6

Awesome - good to hear the new version helps .

Allan

Setting http header for ajax

Setting http header for ajax

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Setting http header for ajax

Setting http header for ajax

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