We Keep Coding

C3 js, how to access json data received in url call

Below is the code to generate barchart using C3 js library
var chart = c3.generate({
bindto: '#barchart',
data: {
url: './API/get_bar_chart_data.php',
mimeType: 'json',
type: 'bar',
keys: {
x: 'category', // it's possible to specify 'x' when category axis
value: [ 'number']
},
onclick: function (d, i) {
console.log(chart.categories()[d.index]);
onclick_barchart();
}
},
bar: {
width: {
ratio: 0.5 // this makes bar width 50% of length between ticks
}
},
axis: {
x: {
type: 'category' // this needed to load string x value
}
}
});
In the above code I am getting data from URL in json format.
Now on click I want to pass this complete json received to onclick_barchart() function.

C3.js converts data received in internal format, so there's no way to get data as received.
IMO, there're 2 ways to handle this.
If you need to handle data keeping as received, maybe you need to call separately. Not in context of C3.js.
// call api and assign the result in separate variable
var data = call_ajax("./API/get_bar_chart_data.php");
var chart = c3.generate({
data: {
columns: data
onclick: function() {
onclick_barchart(data);
}
},
...
}
Or, access transformed data via internal data variable
In this case, you need to handle the format as your necessity.
var chart = c3.generate({
data: {
columns: data
onclick: function() {
// You can access in outside via 'chart.internal.data.targets'
// They're same result from .data() API
// https://naver.github.io/billboard.js/release/latest/doc/Chart.html#data
onclick_barchart(this.data.targets);
}
},
...
}

Iterating over an IEnumerable in Javascript for Chartjs

I have hit upon a problem where by I have an IEnumerable<string> of labels and an IEnumerable<double[]> of data in my MVC model object, and I would like to plot these values using Chartjs.
I pass both of in to my javascript function, which I trying to make plot the chart.
The Chartjs syntax is such that I want, in effect:
var data = {
... chart info e.g. colors, etc.
datasets: [
{
label: labels[0], // My first label
data: datas[0] // My first double[]
},
// Repeat for each data/label combo
{
label: labels[n], // My n-th label
data: datas[n] // My n-th double[]
}
]
};
Given my two collections, how can I extract the information within them appropriately? Clearly the lengths of these collections need to be the same, as there is a one-to-one association. I did try combing them in to a Tuple but I think that will make it more complicated on the js side.
Or does anyone know an easier way to achieve the same end result with ChartJS?
I'm comfortable with C# but Javascript is new to me.

You can certainly send a tuple to the client side and split it up easily with java-script. You could do a simple ajax call to get your tuple as a Json object and then split it up into two arrays. Those arrays could then be used in the chart.js label and data spots.
$.ajax({
url: 'AjaxCall/getChartObjects',
dataType: 'json',
data: {},
success: function (data) { //data here being the tuple recieved from server
//receive the tuple as a single Json object and split it up easily with some seperate arrays
dblArray= []
$.each(data.Item1, function (index, value) {
dblArray.push(value.text); //label array
}
descArray= []
$.each(data.Item2, function (index, value) {
descArray.push(value.dblTxt); //data array
}
},
error: function (xhr, status, error) {
console.log('Error: ' + error.message);
}
});
Sending the tuple from the controller would be something like:
//tuple sends two objects together- both job arrays will be seperated
//and used in observables on client side
var chartObjects = Tuple.Create(chartData, chartLabel);
return Json(chartObjects, JsonRequestBehavior.AllowGet);
You would then have the arrays that you need to place in the chart properties:
var barChartData = {
labels: descArray, //array labels
datasets: [
{
type: "Bar",
strokeColor: "black",
pointColor: "rgba(220,220,220,1)",
pointstrokeColor: "white",
data: dblArray,
}
]
}
I guess I'm not entirely sure if this is what you were looking for. Let me know if you have questions.

ECharts - Set options to externally loaded arrays

So I am using the library ECharts to create some charts and graphs for various data that I have on a website. This is my first time using the library and I am fairly new to Javascript/jQuery. What I am trying to do is set the xAxis data to the results from a local page which will return a JSON Object with an array containing the days of the week. After I can do this, I then plan to load the Series data in the same way.
The jSON that is returned is this
When I am trying to set the data for xAxis, I am doing it as shown
xAxis: [{
type: 'category',
boundaryGap: false,
data: function(){
$.ajax({
type: "POST",
url: "ajax/getData.php?test=t&graph_last_days=d&days=7",
cache: false,
success: function(result){
return result.data;
//console.log(result.data);
}
});
}
}],
However, I keep getting the error Uncaught TypeError: o.slice is not a function and this error is only being outputted when I try and use this method of setting the data. In addition to this, if I try and make a function to return the data from the external page and set a variable to that, whenever I try and print it to the console it says undefined
If I do not use my method of trying to load the external data and I predefine the data like so
xAxis: [{
type: 'category',
boundaryGap: false,
data: [
'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'
]
}]
Then there are no errors and it works just fine
Can anyone see the problem?

Seems that after speaking with some people, the only example usage or documentation available is this example they have which is closely related to my question here.
If anyone else wants some examples related to ajax or dynamic data loading with ECharts then here are some (in English) *
Line + Bar
Scatter + Candlestick
Pie + Radar
Helpful tip
If you do not speak Chinese and you are using some sort of translator for their code examples; be aware that it's common for websites such as Google Translate and Bing Translator to incorrectly translate the punctuation used in JS by doing things such as,
Translating arrays with single quotes into arrays with single quotes and double quotes: thus causing syntax errors.
Removing commas (,) from objects.
Changing Semi-colon's (;) into Colon's (:) or even removing them.

complete example for echarts pushing data from Ajax call
data.importPorts -> Array of strings
data.importBD -> Array of Objects { clientanem : [4,5,6,7,3]}
$.get("/Home/Graph1", { clients: "403,300", years: "2012" })
.done(function (data) {
var option = {
tooltip: {
show: true
},
legend: {
data: (function () {
var res = [];
for (var name in data.importBD) {
res.push(name);
};
return res;
})()
},
xAxis: [
{
type: 'category',
data: (function () {
var res = [];
data.importPorts.forEach(function (i) {
res.push(i);
});
return res;
})()
}
],
yAxis: [
{
type: 'value'
}
],
series: [
{
}
]
};
for (var name in data.importBD) {
var obj = {
name: name,
type: "bar",
data: data.importBD[name]
};
option.series.push(obj);
}
// Load data into the ECharts instance
imprtChart.setOption(option);
});

unable to store json data in grid store in extjs

I want to display data in grid using extjs. Data from servlet is in json format.
and below is my code...problem is that i am unable to capture output from servlet to extjs.
I want to display data in grid using extjs. Data from servlet is in json format.
and below is my code...problem is that i am unable to capture output from servlet to extjs.
Ext.onReady(function(){
var myData = null;
Ext.Ajax.request({
url : 'AccessServlet',
method : 'GET',
success: function (result, request) {
myData = Ext.decode(result.responseText);
store.loadData(myData);
},
failure: function ( result, request) {
Ext.MessageBox.alert('Failed', result.responseText);
}
});
var store = new Ext.data.ArrayStore({
fields: [
{name: 'name' },
{name: 'salary'},
{name: 'sno' },
]
});
var grid = new Ext.grid.GridPanel({
store : store,
height : 350,
width : 400
columns: [
{
header: 'SNO',
width : 100
},
{
header: 'NAME',
width : 100
},
{
header: 'SALARY',
width : 100
},
],
});
grid.render('example-grid');
});

Do not use Ajax to load store, use proxy config and appropriate reader.
Is your data array of arrays? Maybe your json has wrong format

ExtJS: return total rows/records in json store

I have a json store that returns values in json format. Now I need to get the number of rows/records in the json string but when I use store.getCount() function it returns 0, but the combobox is populated with rows, and when I use store.length I get undefined, probably because its not an array anymore, its returning from store, which is calling php script. Anyways, whats the best approach for this problem?

Try this out:
var myStore = Ext.extend(Ext.data.JsonStore, {
... config...,
count : 0,
listeners : {
load : function(){
this.count = this.getCount();
}
}
Ext.reg('myStore', myStore);
and then use inside panels:
items : [{
xtype : 'myStore',
id : 'myStoreId'
}]
Whenever you need to get the count then you can simply do this:
Ext.getCmp('myStoreId').count

Your Json response from server, can be something like this...
{
"total": 9999,
"success": true,
"users": [
{
"id": 1,
"name": "Foo",
"email": "foo#bar.com"
}
]
}
Then you can use reader: {
type : 'json',
root : 'users',
totalProperty : 'total',
successProperty: 'success'
} in your store object.

As from docs if your data source provided you can call getTotalCount to get dataset size.

If you use ajax proxy for the store, smth like
proxy : {
type : 'ajax',
url : 'YOUR URL',
reader : {
type : 'json',
root : 'NAME OF YOUR ROOT ELEMENT',
totalProperty : 'NAME OF YOUR TOTAL PROPERTY' // requiered for paging
}
}
and then load your store like
store.load();
There will be sent Ajax asynchronous request, so you should check count in callback like this
store.load({
callback : function(records, operation, success) {
console.log(this.getCount()); // count considering paging
console.log(this.getTotalCount()); // total size
// or even
console.log(records.length); // number of returned records = getCount()
}
});