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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <h1>Responsive and animated <a href="https://d3js.org/">D3.js</a> bar chart with positive and negative values (TypeScript)</h1>

<p>
  <button id="update-bar-chart">Update chart</button>
</p>

<div class="container">
  <div id="barchart" class="barchart"></div>
</div>

            
          
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              html, body {
  color: #333;
  font-size: 16px;
  line-height: 20px;
}
body {
  margin: 20px;
}

h1 {
  line-height: 1.2;
  margin: 0 auto 35px;
  max-width: 800px;
  text-align: center;
}

p {
  text-align: center
}

button {
  padding: 5px 10px;
}

.container {
  margin: 0 auto 35px;
  max-width: 800px;
}

.barchart {
  border: 1px solid #eee;
}

            
          
!
            
              interface ChartInterface {
  create(),
  setData(data: any[]),
  setElement(element: HTMLElement),
  setOptions(options: {[name: string]: any})
}

class BarChart implements ChartInterface {
  private element: HTMLElement
  private data: any[]
  private minValue: number
  private maxValue: number
  private svg: any
  private options: {[name: string]: any} = {
    colors: {
      highlight: '#b11adc',
      highlightLight: '#d975f6',
      text: '#777',
      xAxis: '#eee',
      yAxis: '#999'
    },
    height: 480,
    width: 360,
    margin: {
      top: 10,
      left: 30,
      right: 10,
      bottom: 20
    },
    animationDuration: 300,
    ticksInterval: 10
  }
  private yScale: any
  private xScale: any

  public create() {
    this.initValues()
    this.initScales()
    this.initChart()
    this.createAxis()
    this.createBars()
  }
  
  public setData(data: any[]) {
    this.data = data
  }

  public setElement(element: HTMLElement) {
    this.element = element
  }

  public setOptions(options: {[name: string]: any}) {
    this.options = {
      ...this.options,
      ...options
    }
  }

  private initChart() {
    const el = d3.select(this.element)
    
    el.select('svg').remove()

    this.svg = el.append('svg').attr(
      'viewBox', 
      `0 0 ${this.options.width} ${this.options.height}`
    )
    
    const isIE = () => {
      const ua = navigator.userAgent
      return ua.match(/Trident\/7.0/) || ua.match(/Trident\/6.0/)
    }
    
    if (isIE()) {
      this.svg.attr('width', this.options.width)
      this.svg.attr('height', this.options.height)
    }
  }

  private initValues() {
    const minValue = Number(d3.min(this.data.map(el => el.value)))
    const maxValue = Number(d3.max(this.data.map(el => el.value)))

    this.minValue = minValue < 0 ? minValue - this.options.ticksInterval : 0
    this.maxValue = maxValue + this.options.ticksInterval
  }
  
  private initScales() {
    this.yScale = d3
      .scaleLinear()
      .domain([this.minValue, this.maxValue])
      .range([
        this.options.height - this.options.margin.bottom, 
        this.options.margin.top
      ])
    
    this.xScale = d3
      .scaleBand<number>()
      .domain(d3.range(this.data.length))
      .range([
        this.options.margin.left + this.options.margin.right, 
        this.options.width - this.options.margin.right
      ])
      .paddingInner(this.calculatePadding(this.data.length))
  }
  
  private getBarMaxWidth() {
    const width = window.innerWidth
    return width <= 768 ? width <= 480 ? 10 : 15 : 20
  }
  
  private getBarColor(i: number, change: number = 0) {
    const red = (210 + change).toString()
    const green = ((10 + 20 * i) + change).toString()
    const blue = ((220 - 20 * i) + change).toString()
    return `rgb(${red}, ${green}, ${blue})`
  }

  private createBars() {
    const bars = this.svg
      .selectAll('.bar')
      .data(this.data)
      .enter()
      .append('rect')
      .classed('bar', true)
      .style('fill', 'transparent')
      .style('display', (d) => typeof d.value === 'number' ? 'initial' : 'none')
      .attr('x', (d, i) => this.xScale(i))
      .attr('y', this.yScale(0))
      .attr('width', this.xScale.bandwidth())
      .attr('height', 0) 
    
    bars
      .transition()
      .style('fill', (d, i) => this.getBarColor(i))
			.duration(this.options.animationDuration)
			.delay((d, i) => i * this.options.animationDuration / 3)
      .attr('x', (d, i) => this.xScale(i))
      .attr('y', (d, i) => d.value < 0 ? this.yScale(0) : this.yScale(d.value))
      .attr('width', this.xScale.bandwidth())
      .attr('height', (d, i) => d.value < 0 ? this.yScale(d.value) - this.yScale(0) : this.yScale(0) - this.yScale(d.value))
    
    bars.on("mouseover touchstart", (d, i, nodes) => {
      const tick = d3.select(`.x-axis .tick:nth-child(${i+1}`)
      const color = this.getBarColor(i, 20)

      d3.select(nodes[i])
        .transition()
        .style('fill', color)

      tick.select('line')
        .transition()
        .style('stroke', color)

      tick.select('text')
        .transition()
        .style('fill', color)

    }).on("mouseout touchend", (d, i, nodes) => {
      const tick = d3.select(`.x-axis .tick:nth-child(${i+1}`)

      d3.select(nodes[i])
        .transition()
        .style('fill', this.getBarColor(i))

      tick.select('line')
        .transition()
        .style('stroke', this.options.colors.xAxis)

      tick.select('text')
        .transition()
        .style('fill', this.options.colors.text)
    })
  }
  
  private createAxis() {
    const xAxis = d3
      .axisBottom(this.xScale)
      .tickSize(-this.options.width)
      .tickFormat((d, i) => this.data[i].label.toUpperCase())
      
    const yAxis = d3
      .axisLeft(this.yScale)
      .tickSize(-this.options.width)
      .tickFormat(d => `${d} %`)
      .ticks(this.options.ticksInterval)

    this.svg
      .append('g')
      .attr('class', 'axis x-axis')
      .attr('transform', `translate(0, ${this.options.height-15})`)
      .call(xAxis)
    
    this.svg
      .append('g')
      .attr('class', 'axis y-axis')
      .attr('transform', `translate(${+this.options.margin.left}, 0)`)
      .call(yAxis)

    this.svg.selectAll('.axis .domain').remove()
    this.svg.selectAll('.axis .tick text').style('fill', this.options.colors.text)
    this.svg.selectAll('.y-axis .tick line').style('stroke', this.options.colors.yAxis)
    this.svg.selectAll('.x-axis .tick line').style('stroke', this.options.colors.xAxis)
  }
  
  private calculatePadding(barCount: number) {
    return 1 - (barCount * this.getBarMaxWidth() / this.options.width)
  }
}

class ChartRenderer {

  private chart: ChartInterface
  private data: any[]
  private element: HTMLElement

  constructor(chart: ChartInterface) {
    this.chart = chart
    this.initResize()
  }

  setData(data: any[]) {
    this.data = data
  }

  setElement(element: HTMLElement) {
    this.element = element
  }

  initResize() {
    let resizeTimer
    const resizeListener = () => {
      clearTimeout(resizeTimer)
      resizeTimer = setTimeout(() => {
        this.render()
      }, 200)
    }
    window.removeEventListener('resize', resizeListener)
    window.addEventListener('resize', resizeListener)
  }

  render() {
    const options = {
      width: this.element.offsetWidth,
      height: this.element.offsetWidth / 1.6
    }
    this.chart.setElement(this.element)
    this.chart.setData(this.data)
    this.chart.setOptions(options)
    this.chart.create()
  }
}

const getRandomData = (limit: number): any[] => {
  const chars = 'abcdefghijklmnopqrstuvwxyz'
  const getValue = () => {
    const value = Math.floor(Math.random() * 101) - 50
    return value === 0 || value === -1 || value === 1 ? 10 : value
  }
  return chars.substr(0, limit).split('').map(el => {
    return {
      value: getValue(),
      label: el
    }
  })
}

// Initialize chart
const renderer = new ChartRenderer(new BarChart())
renderer.setElement(document.getElementById('barchart'))
renderer.setData(getRandomData(12))
renderer.render()

// Update chart button
const updateButton = document.getElementById('update-bar-chart')
updateButton.onclick = () => {
  renderer.setData(getRandomData(12))
  renderer.render()
}

            
          
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