Discussion on: Simple search form in REACT using hooks 🔎.

[Alex K.]

Nice tutorial :) One comment - you don't really need to set the filtered results on the state in this case. I'd just filter the people according to the search term during render:

function App() {
  const [searchTerm, setSearchTerm] = React.useState("");
  const handleChange = event => {
    setSearchTerm(event.target.value);
  };

  const results = !searchTerm
    ? people
    : people.filter(person =>
        person.toLowerCase().includes(searchTerm.toLocaleLowerCase())
      );

  return (
    <div className="App">
      <input
        type="text"
        placeholder="Search"
        value={searchTerm}
        onChange={handleChange}
      />
      <ul>
        {results.map(item => (
          <li>{item}</li>
        ))}
      </ul>
    </div>
  );
}

Here's a sandbox.

[fatemehqasemkhani]

Thanks for sharing your knowledge.

[Mayuran]

Since setState is asynchronous isn’t it better to use useEffect to handle this side effect? Please explain if I’m wrong here.

[Alex K.]

In this case setState will cause a re-render so the component will be rendered with the new value of filter, which is then applied to the filtered array before displaying the final results.

[Mayuran]

I still think useEffect is a better approach (readable, maintainable), because calculating search in reality will be a side effect and could be left asynchronous, and not block rendering. When the search calculation is complete, by setting state we can trigger a re-render with the search results instead of blocking rendering, during the typing of a search term.

The functional component itself is the render function, I prefer to leave it as it is and use helper functions to perform side effects. But this is just my opinion, what do you think?

[Alex K.]

The two approaches are functionally similar. The main difference is that with useEffect approach you introduce extra unnecessary code, plus saving unnecessary values to the state, which can be derived at render time. This is similar to the discussion of storing derived data onto the state.

It's not that useEffect approach is wrong here, it's just that it can be simplified :)

[Mayuran]

Got it, I'm learning a lot about React from this conversation. Thank you for the link :')

[Alex K.]

Sure thing! :) I also wrote an article about some of the common mistakes with React:

The most common mistakes when using React

Alex K. ・ Sep 11 '19 ・ 5 min read

#javascript #react #webdev #beginners

[Bhushan Nayak]

Hi Alex.. Can you make a component in react functional hooks which has sort, filter & search feature using your method?

The final result should be a single element which can be mapped to show the cards accordingly and It should not alter the existing data in the array but re-arrange/show accordingly.

I have a sample data as below:
const data = [
{
_id: "dress1",
image: "/images/fans.jpg",
title: "shirt",
description:
"This is for all the latest trends, no matter who you are, where you’re from and what
you’re up to. Exclusive to ASOS, our universal brand is here for you, and comes in all our fit ranges: ASOS Curve, Tall, Petite and Maternity. Created by us, styled by you.",
availableSizes: ["X", "L", "XL", "XXL"],
price: 29.9584
},
{
_id: "dress2",
image: "/images/mcb.jpg",
title: "Pants",
description:
"This is for all the latest trends, no matter who you are, where you’re from and what you’re up to. Exclusive to ASOS, our universal brand is here for you, and comes in all our fit ranges: ASOS Curve, Tall, Petite and Maternity. Created by us, styled by you.",
availableSizes: ["X", "M", "L"],
price: 18.78
}];

[amit-dotcode]

i m facing problem this type data filterting

[amit-dotcode]

when I m try iterate array object data cause some error will you explain why this error and how to solve this
screenshots...
dev-to-uploads.s3.amazonaws.com/i/...

dev-to-uploads.s3.amazonaws.com/i/...

dev-to-uploads.s3.amazonaws.com/i/...

[Alex K.]

Hi, the name property in the first object of the array is a number, which doesn't have string methods such as toLowerCase(). Make sure it is a string.

[amit-dotcode]

dev.to/amitdotcode/search-box-filt...

please solved my this problm

[amit-dotcode]

this is my code link please check ...
my problem is I m using a search filter method to the search box if anybody searches note list
note data search but the problem is if I remove text my search filter my added data old data not
show only filter data show... if you see my code and add some note and filter you will better understand
what I m try to say

link here......
codesandbox.io/s/unruffled-bose-tk...

[amit-dotcode]

how to handle this type functionality and data please reply me I share you screenshots

[TechArshu]

how to use this array instead of people
const searchData = [
{
urlName: "bb",
linkurl: "/bb",
},
{
urlName: "aa",
linkurl: "/aa",
},
{
urlName: "ea",
linkurl: "/ee",
},
{
urlName: "d s",
linkurl: "/dd",
},
];

[Ahmed Aziz]

Thank you, that was really helpful! One quastion: do you know how to make the search accept two seach parameters? like i want to search base on the name and also the address?

This what i tried, and failed :(

function App() {
  const [searchTerm, setSearchTerm] = React.useState("");
  const [searchTerm2, setSearchTerm2] = React.useState("");

  const handleChange = event => {
    setSearchTerm(event.target.value);
  };

  const handleChange2 = event => {
    setSearchTerm2(event.target.value);
  };

  const results = !searchTerm || !searchTerm2
    ? people
    : people.filter(person =>
        person.name.toLowerCase().includes(searchTerm.toLocaleLowerCase())
    ||  person.address.toLowerCase().includes(searchTerm2.toLocaleLowerCase())
      );

  return (
    <div className="App">
      <input
        type="text"
        placeholder="Search name"
        value={searchTerm}
        onChange={handleChange}
      />
      <input
        type="text"
        placeholder="Search address"
        value={searchTerm2}
        onChange={handleChange2}
      />
      <ul>
        {results.map(item => (
          <li>{item}</li>
        ))}
      </ul>
    </div>
  );
}

[Alex K.]

I think it'd be const results = !searchTerm && !searchTerm2 instead of || otherwise the filtering will be applied only of both search terms are present.

[Ahmed Aziz]

  const results =
    searchTerm || searchTerm2
      ? !searchTerm2
        ? people.filter(person =>
            person.name.toLowerCase().includes(searchTerm.toLocaleLowerCase())
          )
        : people.filter(
            person =>
              person.address.toLowerCase() ===
              searchTerm2.toLocaleLowerCase()
          )
      : people;

i came up with this solution and it works now but only if one of the conditions is true. I want to make the method filter the two conditions in the same time. So like i want to know all the people that their name is Alex and lives in New york

[Alex K.]

For your specific case you can do like this:

const results = searchTerm && searchTerm2 ?
  people.filter(person =>
    person.name.toLowerCase().includes(searchTerm.toLocaleLowerCase()) &&
    person.address.toLowerCase().includes(searchTerm2.toLocaleLowerCase())
  ) : people

However, note that the filter won't be applied unless both search terms are present.

[Ahmed Aziz]

Yah but that is exactly what i don't want. I want that the user can choose one of the filters or both of them in the sametime

[Lucas Canavesio]

Hello! In the end you found the solution?