What steps should I follow to incorporate this filter into my code?

Question

What steps should I follow to incorporate this filter into my code?

Currently, I am working with a list of names obtained from an array using the Fetch method. I have implemented a searchHandler method which is triggered by a button click, and it logs the input data in the console:
https://codesandbox.io/s/jovial-lovelace-z659k
However, I am facing an issue where I want to enter a specific "First name" in the input field, click the button, and only display the line corresponding to that name. Unfortunately, I am struggling to implement the necessary filter logic.
I came across a potential solution online, but I am unable to seamlessly integrate it into my existing code. Here's the snippet:

getFilteredData() {
    if (!this.state.search){
        return this.state.data
    }
    return this.state.data.filter(item=>{
        return item["firstName"].toLowerCase().includes(this.state.search.toLowerCase())
    });
}

Can you guide me on how to incorporate this filter logic into my code? What modifications should I make in the render method?

javascript

Answer 1

Answer №1

Your current approach seems to be on the right track. Below is the revised code with comments detailing the modifications:

searchHandler = search => {
    // Checking if the search query is empty and resetting data to display the initial list
    if (search) {
        const arr = this.state.data.group && this.state.data.group.first ? this.state.data.group.first : this.state.data;
        const filteredArr = arr.filter((item) => {
            // Filtering based on 'search' instead of 'state.search' as the state has not been updated with the search term
            return item["firstName"].toLowerCase().includes(search.toLowerCase())
        })
        // Updating state to reflect filtered data
        this.setState({data: filteredArr})
    } else {
        this.resetData();
    }
};

// Asynchronous function to reset data, similar to what is in componentDidMount
async resetData() {
    const response = await fetch("/data/mass.json");
    const data = await response.json();
    this.setState({
        data
    });
}

Note:

includes may not be supported by all browsers. For a more reliable solution, consider using indexOf. More information can be found here.

Answer 2

Your current approach seems to be on the right track. Below is the revised code with comments detailing the modifications:

searchHandler = search => {
    // Checking if the search query is empty and resetting data to display the initial list
    if (search) {
        const arr = this.state.data.group && this.state.data.group.first ? this.state.data.group.first : this.state.data;
        const filteredArr = arr.filter((item) => {
            // Filtering based on 'search' instead of 'state.search' as the state has not been updated with the search term
            return item["firstName"].toLowerCase().includes(search.toLowerCase())
        })
        // Updating state to reflect filtered data
        this.setState({data: filteredArr})
    } else {
        this.resetData();
    }
};

// Asynchronous function to reset data, similar to what is in componentDidMount
async resetData() {
    const response = await fetch("/data/mass.json");
    const data = await response.json();
    this.setState({
        data
    });
}

Note:

includes may not be supported by all browsers. For a more reliable solution, consider using indexOf. More information can be found here.

Answer 3

Answer №2

If your fetched data consists of an array of objects and you need to filter out objects that meet certain criteria, here is a guide on how to create a search handler:

searchHandler = searchTerm => {
    const { data } = this.state;
    const filteredData = {
      group: {
        first: Object.values(data.group.first).filter(item => item.firstName.includes(searchTerm)),
      }
    }
    this.setState({ data: filteredData });
};

This function takes the array of objects from the data and filters out only those objects that contain the specified search term in their firstName property. The filtered array of objects is then structured the same way as the original data object and updated in the state. You do not need to modify the render method as it already works with the data in the state. When a search is made, the state is updated and the new data will be reflected in the render.

Answer 4

If your fetched data consists of an array of objects and you need to filter out objects that meet certain criteria, here is a guide on how to create a search handler:

searchHandler = searchTerm => {
    const { data } = this.state;
    const filteredData = {
      group: {
        first: Object.values(data.group.first).filter(item => item.firstName.includes(searchTerm)),
      }
    }
    this.setState({ data: filteredData });
};

This function takes the array of objects from the data and filters out only those objects that contain the specified search term in their firstName property. The filtered array of objects is then structured the same way as the original data object and updated in the state. You do not need to modify the render method as it already works with the data in the state. When a search is made, the state is updated and the new data will be reflected in the render.

What steps should I follow to incorporate this filter into my code?

Answer №1

Note:

Answer №2

Similar questions

Unable to modify array state with data from another state

What is the best way to send a POST request with axios in a React application?

I am experiencing an issue where the req.body object is returning undefined even after implementing express router and using express.urlencoded

How can I interact with objects in a Three.js scene? Is document.getElementById() the appropriate method to use?

Transfer the "file" from the busboy to the GM for FTP uploading

Monitoring changes to localstorage in AngularJS

Ways to remove a JSON item based on its index position?

The tooltips on a resized jQuery Flot chart are displaying in the incorrect location

Three.js: transforming textures into data textures

Angular 2 Aot Issue: CRITICAL ERROR: CALL_AND_RETRY_LAST Allocation unsuccessful - JavaScript heap exhausted

Encountering a connection error when trying to access a Google spreadsheet within a Next.js application

sophisticated method for sorting through data within an array of arrays

Designing the database structure for a Q&A website powered by MongoDB

The Angular application sent an OPTIONS request instead of a POST request via HTTP

Preventing the addition of hash tags to the URL by the anything slider

What is the best way to use an ID to call a Class in a Script?

What is the proper way to integrate "require" into my Angular 2 project?

"Converting an image in Byte[] format to a Base64 string in JavaScript: A step-by-step

Transformation in input value does not manifest in other components

Combining two observable entities