How to Make a Range Component With RC-Slider | by Matt Croak Code | Jul, 2022

It began with a LinkedIn DM

Picture by Lautaro Andreani on Unsplash


Not too long ago, I used to be simply minding my very own enterprise when somebody messaged me on LinkedIn. Nemanja Jerinic reached out, saying he had seen a solution that I posted on Stack Overflow about how you can replace values on an Ant Design Slider dynamically.

Nemanja was engaged on one thing related with rc-slider and needed to see how he might incorporate his personal lessons with the slider. He was additionally having hassle establishing the vary portion of the slider and couldn’t get each handles to be seen. Subsequently, the slider values weren’t set correctly.

Under is what the outcome was presupposed to appear like.

And here’s what it seemed like with out the CSS.

I had some free time and determined to take a look at his code.

It seems he was getting his lessons to work with the rc-slider; he simply wanted to use the CSS otherwise. I added the beneath code (in daring) to his CSS, and it appeared to fulfill what he was on the lookout for.

place: absolute;
width: 100%;
background-color: #f50c0c !necessary;
/* top: 100%; */

border-radius: 6px;
place: absolute;
top: 100%;
border-radius: 6px;
background-color: var(--color-red) !necessary;
opacity: 100% !necessary;
show: flex;
flex-direction: column;
flex-start; float: left;
background-color: black;
padding: 10px;

show: flex;
hole: 10px;
colour: white;

Apart from just a few cases the place !necessary was wanted and some different colour and padding modifications, his CSS was fairly!

The onerous half was with React.

His React code appeared fairly simple, though the habits was not as anticipated. Under is the render technique of his part.

Under is what the handleChange seemed like.

handleChange = (sliderValues) => 
this.setState( sliderValues );

And listed here are the preliminary state values.

state =  sliderValues: [2900, 29000] ;

Every little thing gave the impression to be proper, however for some purpose, two issues weren’t working.

First, there was just one deal with on the slider when there needs to be two. One to manage the decrease finish of the vary; the opposite to manage the upper finish.

Second, as quickly as I dragged the deal with, this might occur to the rendered values…

As you may see, the values which might be presupposed to be the ends of the vary are empty.


Effectively, upon sliderValues in handleChange, I seen that as an alternative of an array of integers, there was only one integer. So the state was being set to an integer as an alternative of an array of integers.

This meant that the code attempting to entry sliderValues[0] and sliderValues[1] was undefined. The slider was not being handled as a variety.

After following the docs and NPM, I couldn’t determine what was flawed. Why wasn’t Vary being handled as a variety? Why was there no technique to get two handles?

Effectively, in earlier variations, it could seem that merely offering an array of integers to defaultValue would inform the part it was presupposed to act as a variety. However now, it simply wasn’t slicing it. And, for some purpose, I couldn’t discover any options or references to it within the docs or on NPM.

However I did discover a answer on Github.

This Github thread that I stumbled upon reveals that as not too long ago as April, individuals had been confused and attempting to repair the identical factor that I used to be encountering. It seems, for model 10 of rc-slider, the solution was so as to add a brand new prop to the part: vary.

See the up to date Vary code beneath.

defaultValue=[2900, 29000]

By together with this property (and never specifying its worth as something aside from true) the whole lot labored as anticipated.

Under is the ultimate outcome.

On the subject of code, so usually is a tough answer one thing so easy.

He’ll want so as to add just a few extra styling fixes to make it look extra like what he was engaged on, however this appears to have considerably lightened the load.

This sh*t proper right here all the time makes me pleased

He needed to return the favor however truthfully, being entrusted to assist a complete stranger on LinkedIn and attending to the underside of a bug is reward sufficient.

Though, once I instructed him I used to be writing a submit about it, he did supply to share it on social media, which is all the time appreciated (trace trace).

When you, expensive reader, ever want any code-related assist, be at liberty to DM me on LinkedIn! I’d be pleased to assist nevertheless I can :).

Additionally, remember to join with Nemanja on LinkedIn!

The supply code for this venture could be discovered here.

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