Chart.js

Chart.js ni kitabu cha JavaScript cha kawaida cha kurejea charti kwa HTML.

Hii ni moja ya mashariki ya JavaScript kwa vizuizi, na ina aina za charti zifuatazo:

  • Charti za kizitoa (Scatter Plot)
  • Charti za kifunzi (Line Chart)
  • Charti za baraka (Bar Chart)
  • Charti za sehemu (Pie Chart)
  • Charti za donut (Donut Chart)
  • Charti za kichwa cha mbele (Bubble Chart)
  • Charti za eneo (Area Chart)
  • Charti za radar (Radar Chart)
  • Charti za kushere kwa ujumbe (Mixed Chart)

Kutumia Chart.js?

Chart.js inapendea sana.

Kwanza,ongezesha kumuonyesha kiwango cha CDN (Content Delivery Network):

<script
src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js">
</script>

Kisha,ongezesha <canvas> kwenye eneo ambao unaenda kwenye charti:

<canvas id="myChart" style="width:100%;max-width:700px"></canvas>

Elementi cha canvas lazima iwe idadi pekee.

Hii ni kama hii!

Typiki ya charti za kizitoa:

const myChart = new Chart("myChart", {
  type: "scatter",
  data: {},
  options: {}
});

Typiki ya charti za kifunzi:

const myChart = new Chart("myChart", {
  type: "line",
  data: {},
  options: {}
});

Typiki ya charti za baraka:

const myChart = new Chart("myChart", {
  type: "bar",
  data: {},
  options: {}
});

mashambao wa viwango

miliki wa nyumba vs. eneo

Makini ya Mtaalamu

const xyValues = [
  {x:50, y:7},
  {x:60, y:8},
  {x:70, y:8},
  {x:80, y:9},
  {x:90, y:9},
  {x:100, y:9},
  {x:110, y:10},
  {x:120, y:11},
  {x:130, y:14},
  {x:140, y:14},
  {x:150, y:15}
];
new Chart("myChart", {
  type: "scatter",
  data: {
    datasets: [{
      pointRadius: 4,
      pointBackgroundColor: "rgba(0,0,255,1)",
      data: xyValues
    }]
  },
  options:{...}
});

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mashambao laenea

miliki wa nyumba vs. eneo

Makini ya Mtaalamu

const xValues = [50,60,70,80,90,100,110,120,130,140,150];
const yValues = [7,8,8,9,9,9,10,11,14,14,15];
new Chart("myChart", {
  type: "line",
  data: {
    labels: xValues,,
    datasets: [{
      backgroundColor:"rgba(0,0,255,1.0)",
      borderColor: "rgba(0,0,255,0.1)",
      data: yValues
    }]
  },
  options:{...}
});

亲自试一试

kama ikilingwa na borderColor: 0kama ingepewa na borderColor:

borderColor: "rgba(0,0,0,0)",

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mashambao ya mawili

Makini ya Mtaalamu

const xValues = [100,200,300,400,500,600,700,800,900,1000];
new Chart("myChart", {
  type: "line",
  data: {
    labels: xValues,,
    datasets: [{
      data: [860,1140,1060,1060,1070,1110,1330,2210,7830,2478],
      borderColor: "red",
      fill: false
    },{
      data: [1600,1700,1700,1900,2000,2700,4000,5000,6000,7000],
      borderColor: "green",
      fill: false
    },{
      data: [300,700,2000,5000,6000,4000,2000,1000,200,100],
      borderColor: "blue",
      fill: false
    }]
  },
  options: {
    legend: {display: false}
  }
});

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mashambao laenea

Makini ya Mtaalamu

const xValues = [];
const yValues = [];
generateData("x * 2 + 7", 0, 10, 0.5);
new Chart("myChart", {
  type: "line",
  data: {
    labels: xValues,,
    datasets: [{
      fill: false,,
      pointRadius: 1,,
      borderColor: "rgba(255,0,0,0.5)",
      data: yValues
    }]
  },
  options: {...}
});
function generateData(value, i1, i2, step = 1) {
  for (let x = i1; x <= i2; x += step) {
    yValues.push(eval(value));
    xValues.push(x);
  }
}

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Mifano ya Funkana

Ina uhusiano na Mifano Mwitu ya Kilele. Hataru kumwambia generateData: parameta za uharibifu:

generateData("Math.sin(x)", 0, 10, 0.5);

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Mifano Mwitu wa Kimaadui

Makini ya Mtaalamu

var xValues = ["Italia", "Ufaransa", "Uspaini", "Malichi", "Uarujani"];
var yValues = [55, 49, 44, 24, 15];
var barColors = ["red", "green","blue","orange","brown"];
new Chart("myChart", {
  type: "bar",
  data: {
    labels: xValues,,
    datasets: [{
      backgroundColor: barColors,,
      data: yValues
    }]
  },
  options: {...}
});

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Ina rangi pekee:

var barColors = ["blue"];

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Wote wa mawili wa rangi wana rangi moja:

var barColors ="red";

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Mawili ya rangi tofauti:

var barColors = [
  "rgba(0,0,255,1.0)",
  "rgba(0,0,255,0.8)",
  "rgba(0,0,255,0.6)",
  "rgba(0,0,255,0.4)",
  "rgba(0,0,255,0.2)",
];

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Mifano Mwitu wa Kimaadui

只需将 type 由 "bar" 改为 "horizontalBar"：

type: "horizontalBar",

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Mifano

Mfano

new Chart("myChart", {
  type: "pie",
  data: {
    labels: xValues,,
    datasets: [{
      backgroundColor: barColors,,
      data: yValues
    }]
  },
  options: {
    title: {
      display: true,,
      text: "Utuaji wa Kati ya Dunia"
    }
  }
});

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甜甜圈图

只需将 type 由 "pie" 改为 "doughnut"：

type: "doughnut";

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