D3.js Vue.js Tutorial

D3.js Vue.js Code Example

Integrating D3.js with Vue.js allows for the creation of dynamic and interactive data visualizations within Vue applications. This example demonstrates how to create a simple bar chart using Vue.js as the framework and D3.js for the data visualization. We will set up a Vue component that uses D3 to draw the bar chart.

Setting Up

First, ensure you have Vue.js and D3.js included in your project. You can include them via CDN in your HTML or install them using npm in a more complex project setup.

<!-- Include via CDN for simplicity -->

<script src="https://d3js.org/d3.v7.min.js"></script>

<script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>

HTML Structure

Define a basic HTML structure with a div element for Vue to bind to and another for drawing the bar chart.

<div id="app">

          <div id="chart"></div>

</div>

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Vue Component

Now, let's create a Vue instance that includes a mounted lifecycle hook. Within this hook, we'll use D3 to draw a bar chart based on some static data. Notice how Vue's reactivity system is not necessary for this simple example, but it becomes very useful when dealing with dynamic data.

<script>

new Vue({

 el: '#app',

 mounted() {

   this.drawChart();

 },

 methods: {

   drawChart() {

     // Sample dataset

     const data = [100, 200, 300, 400, 500];

     // Set dimensions and margins of the chart

     const margin = {top: 20, right: 20, bottom: 30, left: 40},

         width = 960 - margin.left - margin.right,

         height = 500 - margin.top - margin.bottom;

     // Append the svg object to the #chart div

     const svg = d3.select("#chart").append("svg")

         .attr("width", width + margin.left + margin.right)

         .attr("height", height + margin.top + margin.bottom)

       .append("g")

         .attr("transform", `translate(${margin.left},${margin.top})`);

     // Scale the range of the data in the domains

     const x = d3.scaleBand()

         .range([0, width])

         .padding(0.1);

     const y = d3.scaleLinear()

         .range([height, 0]);

     x.domain(data.map((d, i) => i));

     y.domain([0, d3.max(data, (d) => d)]);

     // Append the rectangles for the bar chart

     svg.selectAll(".bar")

         .data(data)

       .enter().append("rect")

         .attr("class", "bar")

         .attr("x", (d, i) => x(i))

         .attr("width", x.bandwidth())

         .attr("y", (d) => y(d))

         .attr("height", (d) => height - y(d));

   }

 }

});

</script>

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This simple visualization uses a rectangular SVG element for each data point, positioned and sized based on data values. Notice how the Vue component structure allows us to encapsulate the entire functionality of rendering the chart, making our code more organized and maintainable.

By integrating D3.js with Vue.js, we can leverage the strengths of both libraries - Vue for its reactivity and components, and D3 for its powerful data visualization capabilities.