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Cruip

How to build a pricing slider - React

pacovitiello profile image Pasquale Vitiello ・5 min read

In this tutorial, I am going to build a pricing component in React using the HTML structure from the previous article of this series.

Let's create a Pricing.js component file, and add the HTML into the return statement πŸ‘‡

import React from "react";

class Pricing extends React.Component {
  render() {
    return (
      <div className="pricing">
        <div className="pricing-slider center-content">
          <label className="form-slider">
            <span>How many users do you have?</span>
            <input type="range" />
          </label>
          <div className="pricing-slider-value">
            {/* Current slider value */}
          </div>
        </div>

        <div className="pricing-items">
          <div className="pricing-item">
            <div className="pricing-item-inner">
              <div className="pricing-item-content">
                <div className="pricing-item-header center-content">
                  <div class="pricing-item-title">Basic</div>
                  <div className="pricing-item-price">
                    <span className="pricing-item-price-currency" />
                    <span className="pricing-item-price-amount">Free</span>
                  </div>
                </div>
                <div className="pricing-item-features">
                  <ul className="pricing-item-features-list">
                    <li className="is-checked">Excepteur sint occaecat</li>
                    <li className="is-checked">Excepteur sint occaecat</li>
                    <li className="is-checked">Excepteur sint occaecat</li>
                    <li>Excepteur sint occaecat</li>
                    <li>Excepteur sint occaecat</li>
                  </ul>
                </div>
              </div>
              <div class="pricing-item-cta">
                <a class="button" href="http://cruip.com/">
                  Buy Now
                </a>
              </div>
            </div>
          </div>

          <div className="pricing-item">
            <div className="pricing-item-inner">
              <div className="pricing-item-content">
                <div className="pricing-item-header center-content">
                  <div class="pricing-item-title">Advanced</div>
                  <div className="pricing-item-price">
                    <span className="pricing-item-price-currency">$</span>
                    <span className="pricing-item-price-amount">13</span>
                    /m
                  </div>
                </div>
                <div className="pricing-item-features">
                  <ul className="pricing-item-features-list">
                    <li className="is-checked">Excepteur sint occaecat</li>
                    <li className="is-checked">Excepteur sint occaecat</li>
                    <li className="is-checked">Excepteur sint occaecat</li>
                    <li className="is-checked">Excepteur sint occaecat</li>
                    <li className="is-checked">Excepteur sint occaecat</li>
                  </ul>
                </div>
              </div>
              <div class="pricing-item-cta">
                <a class="button" href="http://cruip.com/">
                  Buy Now
                </a>
              </div>
            </div>
          </div>
        </div>
      </div>
    );
  }
}

export default Pricing;

Shaping input and output data

We already have a data scheme with input and output values (check out the first article of this series to know more).

Key Slider value Price, currency Price, amount Price, after
0 1,000 Free
1 1,250 $ 13 /m
2 1,500 $ 17 /m
3 2,000 $ 21 /m
4 2,500 $ 25 /m
5 3,500 $ 42 /m
6 6,000 $ 58 /m
7 15,000 $ 117 /m
8 50,000 $ 208 /m
9 50,000+ Contact us

We will use the state object to contain that data.

Defining the component state

React has a built-in state object where to store property values that belongs to the component. I will use that to set input range and data scheme values.

state = {
  priceInputValue: "0", // initial input value
  priceInput: {         // slider values
    0: "1,000",
    1: "1,250",
    2: "1,500",
    3: "2,000",
    4: "2,500",
    5: "3,500",
    6: "6,000",
    7: "15,000",
    8: "50,000",
    9: "50,000+"
  },
  priceOutput: {        // output values
    plan1: {
      0: ["", "Free", ""],
      1: ["$", "13", "/m"],
      2: ["$", "17", "/m"],
      3: ["$", "21", "/m"],
      4: ["$", "25", "/m"],
      5: ["$", "42", "/m"],
      6: ["$", "58", "/m"],
      7: ["$", "117", "/m"],
      8: ["$", "208", "/m"],
      9: ["", "Contact Us", ""]
    }
  }
};

Now pass the priceInputValue to the input range defaultValue attribute:

<input type="range" defaultValue={this.state.priceInputValue} />

Setting range slider attributes

Create a ref and attach it to the input range element

// Create ref
slider = React.createRef();
// Attach ref
<input
  type="range"
  defaultValue={this.state.priceInputValue}
  ref={this.slider} />

Let's set the range slider min, max attributes, right after the component output has been rendered to the DOM πŸ‘‡

componentDidMount() {
  this.slider.current.setAttribute("min", 0);
  this.slider.current.setAttribute(
    "max",
    Object.keys(this.state.priceInput).length - 1
  );
}

We have now a range slider whose values go from 0 to 9! πŸ™Œ

Here is a recap of what we have built so far:

Binding input and output data

We have a working range slider, but it is still disconnected from the visualized price.

Before anything else, we need to update the priceInputValue property value every time a user interacts with the slider. To do that, let's create a method ...

handlePricingSlide = e => {
  this.setState({ priceInputValue: e.target.value });
};

... to be invoked when the input onChange event occurs.

<input
  type="range"
  ref={this.slider}
  defaultValue={this.state.priceInputValue}
  onChange={this.handlePricingSlide}
/>

OK, now we need another method to retrieve the data to be outputted, accordingly with the current input value

getPricingData = (obj, pos) => {
  return set !== undefined
    ? obj[this.state.priceInputValue][pos]
    : obj[this.state.priceInputValue];
};

This method has two parameters:

  • obj - The input or output object we want to retrieve data from
  • pos (optional) - The position of a required element in the array, if there is any. It is required for the plan objects, since to each key corresponds an array of values (e.g. 0: ["", "Free", ""], ...).

So, to output the current slider value, we will call the method like this πŸ‘‡

<div className="pricing-slider-value">
  {this.getPricingData(this.state.priceInput)}
</div>

And here is how to output the price data instead πŸ‘‡

<div className="pricing-item-price">
  <span className="pricing-item-price-currency">
    {this.getPricingData(this.state.priceOutput.plan1, 0)}
  </span>
  <span className="pricing-item-price-amount">
    {this.getPricingData(this.state.priceOutput.plan1, 1)}
  </span>
  {this.getPricingData(this.state.priceOutput.plan1, 2)}
</div>

Adjusting the slider value element position

Almost there. 🏁 We want the slider value to be following the slider thumb.

We need a new method for that but, before proceeding, there is another DOM element that needs to be referenced.

Create a ref and pass it to the current slider value

// Create ref
sliderValue = React.createRef();
// Attach ref
<div className="pricing-slider-value" ref={this.sliderValue}>

Get the slider thumb size from a CSS property πŸ‘

this.thumbSize = parseInt(
  window
    .getComputedStyle(this.sliderValue.current)
    .getPropertyValue("--thumb-size"),
  10
);

Now that we have a reference for the .pricing-slider-value element, we can create the method.

handleSliderValuePosition = input => {
  const multiplier = input.value / input.max;
  const thumbOffset = this.thumbSize * multiplier;
  const priceInputOffset =
    (this.thumbSize - this.sliderValue.current.clientWidth) / 2;
  this.sliderValue.current.style.left =
    input.clientWidth * multiplier - thumbOffset + priceInputOffset + "px";
};

Here is a visual representation of what the method does πŸ‘‡
Slider positioning adjustment
Call the method as soon as the component has rendered ...

componentDidMount() {
  this.handleSliderValuePosition(this.slider.current);
}

... and every time the input range value changes:

handlePricingSlide = e => {
  this.handleSliderValuePosition(e.target);
};

Conclusion

Here is the final result. Click on Open Sandbox to see the full code.

I hope you enjoyed this tutorial. If you want to see this in action, here is a landing page template where it’s implemented πŸ‘‰ Storm

Pricing component from Storm template

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