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Customization

Styling chart

There is a possibility to make changes in the look and feel of a chart.

Related sample: Chart. Styling (custom CSS)

For this you need to take the following steps:

  • add a new CSS class(es) with desired settings in the <style> section of your HTML page or in your file with styles (don't forget to include your file on the page in this case)
<style>
.my_first_class {
/*some styles*/
}

.my_second_class {
/*some styles*/
}
</style>
  • specify the name of the created CSS class (or names of classes separated by spaces) as the value of the css property in the Chart configuration:
const chart = new dhx.Chart("chart_container", {
css:"my_first_class my_second_class"
});

For example:

<style>
.custom-class .dhx_chart-graph_area {
fill:#444;
}
.custom-class .grid-line {
stroke: white;
stroke-width: 0.5;
}
.custom-class .chart.bar {
fill: orange;
}
</style>
const chart = new dhx.Chart("chart_container", {
type: "bar",
css: "custom-class dhx_widget--bg_white dhx_widget--bordered",
scales: {
"top": {
size: 100
},
"bottom" : {
text: "month", size: 100
},
"left" : {
size: 100, maxTicks: 10, max: 100, min: 0
},
"right": {
size: 100
}
},
series: [
{
id: "A", value: "company C", color: "#5E83BA",
pointType: "circle", fill: "#5E83BA", size: 35
}
]
});

Adding template to scale labels

Related sample: Chart. Text template for scale labels

While configuring chart scales you can add a template for the labels of the scales by using the textTemplate configuration option of scales:

const chart = new dhx.Chart("chart_container", {
type:"line",
css: "dhx_widget--bg_white dhx_widget--bordered",
scales: {
"bottom" : {
text: "month",
textTemplate: function(month) {
return "m:" + month;
}
},
"left" : {
maxTicks: 10, max: 100, min: 0
}
},
series: [
{
id: "A", value: "company C", color: "#5E83BA", strokeWidth: 2
}
]
});

Adding color gradient for bars

Related sample: Chart. Bar chart. Gradient

It is possible to define a color gradient for bars with the help of the gradient option of series. You need to set its value as a function that takes the color of the series filling in Hex format as a parameter:

const chart = new dhx.Chart("chart_container", {
type:"bar",
css: "dhx_widget--bg_white dhx_widget--bordered",
scales: {
"bottom" : {
text: "month",
},
"left" : {
max: 90
}
},
series: [
{
id: "A", value: "company A", color: "none", size: 35,
fill: "#5E83BA",
gradient: function(color) {
return {
stops: [
{
offset: 0.5,
color: color,
opacity: 1
},
{
offset: 1,
color: "#394E79",
opacity: 1
}
]
}
}
}
]
});

Adding template to tooltips

Related sample: Chart. Tooltip template

You can easily define a template for showing values of data items in tooltip via the tooltipTemplate option of series:

function tooltipTemplate(p) {
return "x: " + p[1] + ", y: " + p[0];
};

const chart = new dhx.Chart("chart_container", {
css: "dhx_widget--bg_white dhx_widget--bordered",
scales: {
bottom:{
locator: "value B", title: "value B", max: 70
},
left:{
title: "value A", max: 70
}
},
series: [{
id: "A", type: "scatter", value: "value A", valueY:"value B",
pointType: "circle", color: "#EEB98E",
tooltipTemplate: tooltipTemplate
},
{
id: "B", type: "scatter", value: "value B", valueY: "value A",
pointType: "rect", color: "#5E83BA",
tooltipTemplate: tooltipTemplate
}],
legend: {
series: ["A", "B"],
usePointType: true,
}
});

Adding template to text values of data items in bars

Related sample: Chart. Show text

The showTextTemplate option of series lets you an opportunity to add a template to values that are shown for data items in bars:

const chart = new dhx.Chart("chart_container", {
type: "bar",
css: "dhx_widget--bg_white dhx_widget--bordered",
scales: {
bottom : {
text: "month"
},
left : {
max: 1000, maxTicks: 10, min: 0,
textTemplate: function (cost) {
return cost !== 0 ? "$" + cost + ".00" : cost + ".00"
}
}
},
series: [
{
id: "A", value: "company A", color: "#81C4E8", fill: "#81C4E8",
showText: true,
showTextRotate: -90,
showTextTemplate: function (sum) {
return "$ " + sum + ".00";
},
barWidth: 22, tooltip: false
},
{
id: "B", value: "company B", color: "#74A2E7", fill: "#74A2E7",
showText: true,
showTextRotate: "-90",
showTextTemplate: function (sum) {
return "$ " + sum + ".00";
},
barWidth: 22, tooltip: false
}
],
legend: {
series: ["A", "B"],
halign: "right",
valign: "middle"
}
});