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Chart.js - Ajax response not accept

chart.js not accept ajax post - json respose.i couldn't solve it yet.please help..
https://prnt.sc/spt4p3
https://prnt.sc/spt6j0
my json file is:
[{"DAYS":"01.05.2020","VALUES":"0"},{"DAYS":"02.05.2020","VALUES":"0"},{"DAYS":"03.05.2020","VALUES":"0"},{"DAYS":"04.05.2020","VALUES":"0"},{"DAYS":"05.05.2020","VALUES":"0"},{"DAYS":"06.05.2020","VALUES":"0"},]
javascript file is:
var days = [];
var values=[];
$.ajax({
url: 'class/report/daily_report.php',
type: 'POST',
data: {'reload': 'renew', 'type': 'rep_1'},
success: function (response) {
var jsonARR =$.parseJSON(response);
var k=0;
for ( var key in jsonARR ) {
days[k]=jsonARR[key]["DAYS"];
values[k]=parseInt(jsonARR[key]["VALUES"]);
k++;
}
}
});
var a = {
labels: days,
datasets: [{
backgroundColor: KTApp.getStateColor("danger"),
data: values
}]
};

Please remind that $.ajax() makes an asynchronous HTTP request. In you code however, you create the chart even before ans answer from that request is received.
The problem can be solved by moving the code responsible for chart creation inside the $.ajax() block as shown below.
$.ajax({
success: function(response) {
var jsonARR = $.parseJSON(response);
var k = 0;
for (var key in jsonARR) {
days[k] = jsonARR[key]["DAYS"];
values[k] = parseInt(jsonARR[key]["VALUES"]);
k++;
};
var a = {
labels: days,
datasets: [{
backgroundColor: KTApp.getStateColor("danger"),
data: values
}]
};
new Chart(...);
});

Unable to update class variable after ajax call

After getting two integer upon the ajax request has been completed, this.N and this.M are not getting set by storeDims() even if the dims has correctly been decoded. So it seems that I cannot acces this.N and this.M declared in the constructor.
This is the code
class MapModel {
constructor() {
this.N; // need to initialize this after an ajax call
this.M;
this.seats = new Array();
this.remote_seats = new Array();
}
init(callback) {
let _this = this;
$.when(
_this.getDims(),
_this.getSeats(),
).then(this.initMap(callback))
}
initMap(callback) {
console.log(this.N); // prints undefined
console.log(this.M); // this as well
callback(this.N, this.M, this.seats);
}
getDims() {
let _this = this;
$.ajax({
url: 'src/php/data.php',
type: 'POST',
data: {action: 'getDims'},
success: function (result) {
let dims = JSON.parse(result); // dims[0] = 10, dims[1] = 6
_this.storeDims(dims);
}
});
}
storeDims(dims) {
console.log(dims);
this.N = parseInt(dims[0]);
this.M = parseInt(dims[1]);
console.log(this.N);
console.log(this.M);
}
getSeats() {
let _this = this;
$.ajax({
url: 'src/php/data.php',
type: 'POST',
data: {action: 'getSeats'},
success: function (result) {
let seats = JSON.parse(result);
_this.storeSeats(seats);
}
});
}
storeSeats(seats) {
this.remote_seats = seats;
console.log(this.remote_seats);
}
}

You need to return the ajax promises from the getDms and getSeats functions
getDims() {
let _this = this;
return $.ajax({
url: 'src/php/data.php',
type: 'POST',
data: {action: 'getDims'},
success: function (result) {
let dims = JSON.parse(result); // dims[0] = 10, dims[1] = 6
_this.storeDims(dims);
}
});
}
you can even pass the values directly to the initMap
init(callback) {
let _this = this;
$.when(
_this.getDims(),
_this.getSeats()
).then(function(dims,seats) {_this.initMap(dims,seats,callback)})
}
initMap(dimsRaw,seatsRaw, callback) {
let dims = JSON.parse(dimsRaw);
console.log(dims[0]);
console.log(dims[1]);
callback(dims[0], dims[1], this.seats);
}

The init promise callback is being called on the chain declaration, try adding a function wrapper:
init(callback) {
let _this = this;
$.when(
_this.getDims(),
).then(function() {_this.initMap(callback)})
}

How to push data to create pie chart - chart js

I have data from SQL in json code file (checked in Fiddler)
{"d":[{"__type":"Dashboards.Employee","name":"Test
Hen","turnover":"1500000,0000","color":"#231F20"},{"__type":"Dashboards.Employee","name":"Test
Bai","turnover":"130000,0000","color":"#FFC200"}]}
but i dont know, how to push them correctly in order to create pie chart
my ajax/javascript is here:
$.ajax({
url: 'HelloService.asmx/GetEmployeeDetail',
contentType: 'application/json;charset=utf-8',
data: JSON.stringify({ month: number }),
dataType: 'json',
method: 'post',
success: OnSuccess_,
error: OnErrorCall_
});
function OnSuccess_(response) {
var aData = response.d;
var arr = [];
//var ctx = document.getElementById('pele').getContext('2d');
$.each(aData, function (inx, val) {
var obj = {};
obj.label = val.name;
obj.value = val.turnover;
obj.color = val.color;
arr.push(obj);
});
var ctx = $("#pele").get(0).getContext("2d");
var myPieChart = new Chart(ctx).Pie(arr);}
function OnErrorCall_(response) {
console.log(error);
}
});
});
Am I missing something?
If i use static values (value, label, color) pie chart works without problem.
Thank you

I created the following FiddleJS for you: https://jsfiddle.net/cukyrh5h/1/
You need to replace the URL of the Ajax call with yours of course. You had some wrong syntax (too much braches in the end of your Snippet) and the API you were using was not working with ChartJS 2.4 anymore.
The code looks like the following:
$.ajax({
url:"/echo/json/",
data:data,
type:"POST",
success:OnSuccess_
});
function OnSuccess_(response) {
var aData = response.d;
var data = {
labels: [],
datasets: [{
data: [],
backgroundColor: []
}]
};
$.each(aData, function (inx, val) {
data.labels.push(val.name);
data.datasets[0].data.push(val.turnover);
data.datasets[0].backgroundColor.push(val.color);
});
var ctx = $("#pele").get(0).getContext("2d");
var myPieChart = new Chart(ctx, {
type: 'pie',
data: data
});
}
function OnErrorCall_(response) {
console.log(error);
}

Ok, i found problem, why i cant see my Chart. Maybe it will be useful for another members. Data in Database (turnover was daclared as money, i changed it to int .... and it works)

Does jQuery.ajax() not always work? Is it prone to miss-fire?

I have an $.ajax function on my page to populate a facility dropdownlist based on a service type selection. If I change my service type selection back and forth between two options, randomly the values in the facility dropdownlist will remain the same and not change. Is there a way to prevent this? Am I doing something wrong?
Javascript
function hydrateFacilityDropDownList() {
var hiddenserviceTypeID = document.getElementById('<%=serviceTypeID.ClientID%>');
var clientContractID = document.getElementById('<%=clientContractID.ClientID%>').value;
var serviceDate = document.getElementById('<%=selectedServiceDate.ClientID%>').value;
var tableName = "resultTable";
$.ajax({
type: 'POST',
beforeSend: function () {
},
url: '<%= ResolveUrl("AddEditService.aspx/HydrateFacilityDropDownList") %>',
data: JSON.stringify({ serviceTypeID: TryParseInt(hiddenserviceTypeID.value, 0), clientContractID: TryParseInt(clientContractID, 0), serviceDate: serviceDate, tableName: tableName }),
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (data) {
a(data);
}
,error: function () {
alert('HydrateFacilityDropDownList error');
}
, complete: function () {
}
});
}
function a(data) {
var facilityDropDownList = $get('<%=servicesFormView.FindControl("facilityDropDownList").ClientID%>');
var selectedFacilityID = $get('<%= selectedFacilityID.ClientID%>').value;
var tableName = "resultTable";
if (facilityDropDownList.value != "") {
selectedFacilityID = facilityDropDownList.value;
}
$(facilityDropDownList).empty();
$(facilityDropDownList).prepend($('<option />', { value: "", text: "", selected: "selected" }));
$(data.d).find(tableName).each(function () {
var OptionValue = $(this).find('OptionValue').text();
var OptionText = $(this).find('OptionText').text();
var option = $("<option>" + OptionText + "</option>");
option.attr("value", OptionValue);
$(facilityDropDownList).append(option);
});
if ($(facilityDropDownList)[0].options.length > 1) {
if ($(facilityDropDownList)[0].options[1].text == "In Home") {
$(facilityDropDownList)[0].selectedIndex = 1;
}
}
if (TryParseInt(selectedFacilityID, 0) > 0) {
$(facilityDropDownList)[0].value = selectedFacilityID;
}
facilityDropDownList_OnChange();
}
Code Behind
[WebMethod]
public static string HydrateFacilityDropDownList(int serviceTypeID, int clientContractID, DateTime serviceDate, string tableName)
{
List<PackageAndServiceItemContent> svcItems = ServiceItemContents;
List<Facility> facilities = Facility.GetAllFacilities().ToList();
if (svcItems != null)
{
// Filter results
if (svcItems.Any(si => si.RequireFacilitySelection))
{
facilities = facilities.Where(f => f.FacilityTypeID > 0).ToList();
}
else
{
facilities = facilities.Where(f => f.FacilityTypeID == 0).ToList();
}
if (serviceTypeID == 0)
{
facilities.Clear();
}
}
return ConvertToXMLForDropDownList(tableName, facilities);
}
public static string ConvertToXMLForDropDownList<T>(string tableName, T genList)
{
// Create dummy table
DataTable dt = new DataTable(tableName);
dt.Columns.Add("OptionValue");
dt.Columns.Add("OptionText");
// Hydrate dummy table with filtered results
if (genList is List<Facility>)
{
foreach (Facility facility in genList as List<Facility>)
{
dt.Rows.Add(Convert.ToString(facility.ID), facility.FacilityName);
}
}
if (genList is List<EmployeeIDAndName>)
{
foreach (EmployeeIDAndName employeeIdAndName in genList as List<EmployeeIDAndName>)
{
dt.Rows.Add(Convert.ToString(employeeIdAndName.EmployeeID), employeeIdAndName.EmployeeName);
}
}
// Convert results to string to be parsed in jquery
string result;
using (StringWriter sw = new StringWriter())
{
dt.WriteXml(sw);
result = sw.ToString();
}
return result;
}

$get return XHR object not the return value of the success call and $get function isn't synchronous so you should wait for success and check data returned from the call
these two lines do something different than what you expect
var facilityDropDownList = $get('<%=servicesFormView.FindControl("facilityDropDownList").ClientID%>');
var selectedFacilityID = $get('<%= selectedFacilityID.ClientID%>').value;
change to something similar to this
var facilityDropDownList;
$.ajax({
url: '<%=servicesFormView.FindControl("facilityDropDownList").ClientID%>',
type: 'get',
dataType: 'html',
async: false,
success: function(data) {
facilityDropDownList= data;
}
});

How to initialize knockoutjs view model with .ajax data

The following code works great with a hardcoded array (initialData1), however I need to use jquery .ajax (initialData) to initialize the model and when I do the model shows empty:
$(function () {
function wiTemplateInit(winame, description) {
this.WIName = winame
this.WIDescription = description
}
var initialData = new Array;
var initialData1 = [
{ WIName: "WI1", WIDescription: "WIDescription1" },
{ WIName: "WI1", WIDescription: "WIDescription1" },
{ WIName: "WI1", WIDescription: "WIDescription1" },
];
console.log('gridrows:', initialData1);
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: "{UserKey: '10'}",
url: "WIWeb.asmx/GetTemplates",
success: function (data) {
for (var i = 0; i < data.d.length; i++) {
initialData.push(new wiTemplateInit(data.d[i].WiName,data.d[i].Description));
}
//console.log('gridrows:', initialData);
console.log('gridrows:', initialData);
}
});
var viewModel = function (iData) {
this.wiTemplates = ko.observableArray(iData);
};
ko.applyBindings(new viewModel(initialData));
});
I have been trying to work from the examples on the knockoutjs website, however most all the examples show hardcoded data being passed to the view model.

make sure your "WIWeb.asmx/GetTemplates" returns json array of objects with exact structure {WIName : '',WIDescription :''}
and try using something like this
function wiTemplateInit(winame, description)
{
var self = this;
self.WIName = winame;
self.WIDescription = description;
}
function ViewModel()
{
var self = this;
self.wiTemplates = ko.observableArray();
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: "{UserKey: '10'}",
url: "WIWeb.asmx/GetTemplates",
success: function (data)
{
var mappedTemplates = $.map(allData, function (item) { return new wiTemplateInit(item.WiName, item.Description) });
self.wiTemplates(mappedTemplates);
}
});
}
var vm = new ViewModel();
ko.applyBindings(vm);

If you show us your browser log we can say more about your problem ( Especially post and response ). I prepared you a simple example to show how you can load data with ajax , bind template , manipulate them with actions and save it.
Hope this'll help to fix your issue : http://jsfiddle.net/gurkavcu/KbrHX/
Summary :
// This is our item model
function Item(id, name) {
this.id = ko.observable(id);
this.name = ko.observable(name);
}
// Initial Data . This will send to server and echo back us again
var data = [new Item(1, 'One'),
new Item(2, 'Two'),
new Item(3, 'Three'),
new Item(4, 'Four'),
new Item(5, 'Five')]
// This is a sub model. You can encapsulate your items in this and write actions in it
var ListModel = function() {
var self = this;
this.items = ko.observableArray();
this.remove = function(data, parent) {
self.items.remove(data);
};
this.add = function() {
self.items.push(new Item(6, "Six"));
};
this.test = function(data, e) {
console.log(data);
console.log(data.name());
};
this.save = function() {
console.log(ko.mapping.toJSON(self.items));
};
}
// Here our viewModel only contains an empty listModel
function ViewModel() {
this.listModel = new ListModel();
};
var viewModel = new ViewModel();
$(function() {
$.post("/echo/json/", {
// Data send to server and echo back
json: $.toJSON(ko.mapping.toJS(data))
}, function(data) {
// Used mapping plugin to bind server result into listModel
// I suspect that your server result may contain JSON string then
// just change your code into this
// viewModel.listModel.items = ko.mapping.fromJSON(data);
viewModel.listModel.items = ko.mapping.fromJS(data);
ko.applyBindings(viewModel);
});
})