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How do I get the text from a textbox into a variable that is being sent through an AJAX ‘POST’ request?

I want the text from the ‘txtDATE’ textbox into the variable press_date. The current AJAX post is working perfectly. (except that it’s static and I want the variable). I have been searching for answers and trying everything all day. Any help is appreciated.

     <asp:TextBox ID="txtDATE" runat="server" AutoPostBack="true" Width="75px" ></asp:TextBox>
var press = "'1000'";
var press_date = "'2020-08-01'";
 type: "POST",
 url: "1000TIOT.aspx/GetChartData",
 data: "{ press: " + press +  ", press_date: " + press_date + " }",
 contentType: "application/json; charset=utf-8",
 dataType: "json",
 success: function (r) {
     var data1 = google.visualization.arrayToDataTable(r.d);
     var chart = new google.visualization.BarChart($("#chart")[0]);
     chart.draw(data1, options);
 failure: function (r) {
 error: function (r) {



In place of:

   var press_date = "'2020-08-01'";

You should be able to use:

 var press_date = "'" + $('#txtDATE').val() + "'";

I would also consider placing a ClientIDMode=”Static” attribute for the text box as this would prevent the server side code from re-naming the txtDATE text box by the server side system. And this will ensure that the jquery selector $(‘#txtDATE’) will be able to reference a un-changed control id. (id = “txtDATE” in this example).