I am working on a code with an API. I need to create a line chart for these things called tickets. I need to call the information for them from the API. It has the ticket ID, date, and description. For the labeling, I have four weeks of the month. If I don't call it for every week, the chart won't show up. However, when I do this, instead of the information on a chart popping up, an alert does with all of the information for each week.
var lineChartData = {
labels: ["Week 1","Week 2","Week 3","Week 4"],
datasets: [{
label: "Tickets",
fillColor: "rgba(100,200,244,0.2)",
strokeColor: "rgba(100,200,244,1)",
pointColor: "rgba(200,255,255,.7)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: [$.get("http://velocity.data.wpengine.com:3000/tickets/", function(data){ alert(JSON.stringify(data));}).fail(function() {alert("FAIL");}), $.get("http://velocity.data.wpengine.com:3000/tickets/", function(data){ alert(JSON.stringify(data));}).fail(function() {alert("FAIL");}), $.get("http://velocity.data.wpengine.com:3000/tickets/", function(data){ alert(JSON.stringify(data));}).fail(function() {alert("FAIL");}), $.get("http://velocity.data.wpengine.com:3000/tickets/", function(data){ alert(JSON.stringify(data));}).fail(function() {alert("FAIL");}) ] };
If you need the full code (this has CSS, HTML, and the JavaScript), click here.
$.get does not evaluate to a return value like a normal function call.
When the data is received from http://velocity.data.wpengine.com:3000/tickets/, your callback function gets called. In your case that is
function(data){ alert(JSON.stringify(data));}
You have access to the returned data inside this callback function. And you're just alerting it. Which is why you simply get an alert alone. You need to move your chart drawing code into this call back function. Something like
window.onload = function () {
$.get("http://velocity.data.wpengine.com:3000/tickets/list/", function(data){
var lineChartData = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
fillColor: "rgba(100,200,244,0.2)",
strokeColor: "rgba(100,200,244,1)",
pointColor: "rgba(200,255,255,.7)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: data,
},
{
label: "My Second dataset",
fillColor: "rgba(100,200,244,0)",
strokeColor: "rgba(100,200,244,0)",
pointColor: "rgba(200,255,255,0)",
pointStrokeColor: "rgba(255,255,255,0)",
pointHighlightFill: "#rgba(255,255,255,0)",
pointHighlightStroke: "rgba(220,220,220,0)",
data: [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()]
}]
};
var ctx1 = document.getElementById("chart1").getContext("2d");
window.myLine = new Chart(ctx1).Line(lineChartData, {
showScale: false,
pointDot: true,
responsive: true
});
var ctx2 = document.getElementById("chart2").getContext("2d");
window.myLine = new Chart(ctx2).Line(lineChartData, {
responsive: true
});
....
Related
I'm hoping I can add markup to each dataset individually so that I can change the colors with css.
var ctx = document.getElementById("myChart").getContext("2d");
var data = {
labels: ["(1)","(2)","(3)","(4)","(5)"],
datasets: [
{
label: "Food Chart",
fillColor: "#000066",
strokeColor: "transparent",
pointColor: "red",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: calcChart(),
}
]
}
var options = {
scaleShowHorizontalLines: true,
barValueSpacing : 5,
scaleBeginAtZero : true,
barValueSpacing : 25
}
var myBarChart = new Chart(ctx).Bar(data,options);
Since Chart.js and Canvasjs both use the canvas element to draw the charts you can't interact with the elements using CSS.
If you want to use custom CSS to the chart elements you will need to use a SVG library like highcharts.
Right now I am implementing line chart in angular js. And I have written one directive for this, So it is working fine, But when I am putted $watch in this directive then every time chart will updating continuously. I want to use $watch for some dynamic change after loaded the page.
angular.module('app.abc').directive('linechart', function () {
return {
restrict: 'A',
template:'',
link: function (scope, element, attributes) {
scope.$watch(function(){
var lineOptions = {
scaleShowGridLines : true,
scaleGridLineColor : "rgba(0,0,0,.05)",
scaleGridLineWidth : 1,
bezierCurve : true,
};
var lineData = { labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My Second dataset",
fillColor: "rgba(151,187,205,0.2)",
strokeColor: "rgba(151,187,205,1)",
pointColor: "rgba(151,187,205,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(151,187,205,1)",
data: [28, 48, 40, 19, 86, 27, 90]
}
]
};
var ctx = element[0].getContext("2d");
var myNewChart = new Chart(ctx).Line(lineData, lineOptions);
})
}
}
});
<canvas style="display: block;" linechart height="120" ></canvas>
Line chart reflecting updates is contiguously. But I don't want to reflection continuously. I have tried to put my ctx object outside of $watch, but chart is not showing anything. Actually I am new in angular js and also new in directives. Please give me idea how handle this directive with $watch. I have seen one demo(based on javascript) example https://codepen.io/SitePoint/pen/mJRrKw
I need to do a graph with ChartJs from my Expenses.
This is my view
#login_required
def index(request):
truncate_month = connection.ops.date_trunc_sql('month', 'date_reg')
expense = Expense.objects.extra({'month': truncate_month}).values('month').annotate(Sum('total_amount'))
return render(request, 'home/index.html', {"expense": expense})
On my template
{{ expense }}
And It shows the data in the following format:
[{
'month': '2015-12-01',
'total_amount__sum': 900.0
}, {
'month': '2016-01-01',
'total_amount__sum': 19334.0
}]
How can I format that data to be compatible with chartjs?
ChartJs Example:
labels: ["January", "February", "March", "April", "May", "June", "July"], //Here the month
datasets: [{
label: "My First dataset",
fillColor: "rgba(220,220,220,0.2)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(220,220,220,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: [65, 59, 80, 81, 56, 55, 40] //here 'total_amount__sum'
},
...
As bryanph said use Values_list, and then to change the quotes from ASCII you need to escape them in the template. You can use the safe filter.
Line in View:
expenses = expense.values_list('month', flat=True)
Template:
{{ expense|safe }}
Take a look at values_list: https://docs.djangoproject.com/es/1.9/ref/models/querysets/#values-list
This gives you lists of values rather than dictionaries.
One way is to hook up underscore.js:
return render(request, 'home/index.html', json.dumps({"expense": expense}))
in the template:
data = JSON.parse({{ expense|safe }});
var labels = _.pluck(data, 'month');
var data = _.pluck(data, 'total_amount__sum');
The chart js v2 is overlapping with is there a way to move the labelString of scaleLabel further down so that it does not overlap.Please view the screen shot marked in yellow and red part.
Part of the code is as following
scales: {
xAxes: [{
display: true,
ticks: {
autoSkip: false,
autoSkipPadding: 20
},
scaleLabel: {
display: true,
labelString: "ProductName(ProductName)"
}
}],
There are two possible solutions to your problem:
1: This is for a line chart, but can easily tailored to a bar chart.
The legend is part of the default options of the ChartJs library. So
you do not need to explicitly add it as an option.
The library generates the HTML. It is merely a matter of adding that
to the your page. For example, add it to the innerHTML of a given DIV.
(Edit the default options if you are editing the colors, etc)
<div>
<canvas id="chartDiv" height="400" width="600"></canvas>
<div id="legendDiv"></div>
</div>
<script>
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "The Flash's Speed",
fillColor: "rgba(220,220,220,0.2)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(220,220,220,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: [65, 59, 80, 81, 56, 55, 40]
},
{
label: "Superman's Speed",
fillColor: "rgba(151,187,205,0.2)",
strokeColor: "rgba(151,187,205,1)",
pointColor: "rgba(151,187,205,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(151,187,205,1)",
data: [28, 48, 40, 19, 86, 27, 90]
}
]
};
var myLineChart = new Chart(document.getElementById("chartDiv").getContext("2d")).Line(data);
document.getElementById("legendDiv").innerHTML = myLineChart.generateLegend();
</script>
2: Adding a legend template in chart options
You'll also need to add some basic css to get it looking ok.
//legendTemplate takes a template as a string, you can populate the template with values from your dataset
var options = {
legendTemplate : '<ul>'
+'<% for (var i=0; i<datasets.length; i++) { %>'
+'<li>'
+'<span style=\"background-color:<%=datasets[i].lineColor%>\"></span>'
+'<% if (datasets[i].label) { %><%= datasets[i].label %><% } %>'
+'</li>'
+'<% } %>'
+'</ul>'
}
//don't forget to pass options in when creating new Chart
var lineChart = new Chart(element).Line(data, options);
//then you just need to generate the legend
var legend = lineChart.generateLegend();
//and append it to your page somewhere
$('#chart').append(legend);
Either of these two options will work.
In your case the legend code will look something like this
(Assuming you already have a BarChart Generated)
<div id="legendDiv"></div>
document.getElementById("legendDiv").innerHTML = BarChart.generateLegend();
Then use css to format the legend however you would prefer (including adding spacing between the legend in the chart)
I am trying to render a chart using Chartjs and Requirejs, but it fails to render or provide error messages. I know that I am probably tired and missing something obvious, but I can't seem to figure it out.
The line in my HTML to hold the canvas for the chart is as follows:
<canvas id="canvas" height="450" width="600"></canvas>
My Requirejs file is as follows. It is here that I suspect the issue:
require.config({
paths: {
jquery: "jquery-2.1.1.min",
bootstrap: "bootstrap.min",
chartjs: "Chart.min"
},
shim: {
bootstrap: {
deps: ['jquery'],
exports: 'Bootstrap'
},
}
});
requirejs(['bootstrap'], function (Bootstrap) {
return {};
});
require(['chartjs'], function (Chart) {
// Use Chart.js as normal here.
var randomScalingFactor = function () { return Math.round(Math.random() * 100) };
var lineChartData = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
fillColor: "rgba(220,220,220,0.2)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(220,220,220,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()]
},
{
label: "My Second dataset",
fillColor: "rgba(151,187,205,0.2)",
strokeColor: "rgba(151,187,205,1)",
pointColor: "rgba(151,187,205,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(151,187,205,1)",
data: [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()]
}
]
}
window.onload = function () {
var ctx = document.getElementById("canvas").getContext("2d");
window.myLine = new Chart(ctx).Line(lineChartData, {
responsive: true
});
}
// Chart.noConflict restores the Chart global variable to it's previous owner
// The function returns what was previously Chart, allowing you to reassign.
var chartjs = Chart.noConflict();
});
What you describe is consistent with the event handler you give to window.onload not being fired at all.
By the time RequireJS starts executing the code in your require(['chartjs'] call, the load event has most likely already happened. What you could do is use something like jQuery's ready or RequireJS' domReady.
By the way, this code is bizarre:
requirejs(['bootstrap'], function (Bootstrap) {
return {};
});
If you are just loading bootstrap, you could reduce it to requirejs(['bootstrap']). But note that all loads are asynchronous so the only thing this does is tell RequireJS to load Bootstrap, which will happen at some indeterminate point in the future.