Breaking News: Grepper is joining You.com. Read the official announcement!

throttling in javascript

Amjad Saeed answered on May 22, 2022 Popularity 9/10 Helpfulness 2/10

answer throttling in javascript

related throttling function in javascript

throttling in javascript

Comment

Throttling
Throttling ensures that a function is called at a controlled, steady rate, regardless of how many times an event is triggered within a certain time frame. It allows you to execute a function at a specific interval.

Example: Throttling user input
Suppose you have a search input field, and you want to send a search request to the server only once every 300 milliseconds after the user stops typing.


import React, { useState } from 'react';

function SearchInput() {
  const [query, setQuery] = useState('');
  
  // Define a throttled search function
  const throttleSearch = throttle((searchQuery) => {
    // Send a search request to the server here
    console.log(`Searching for: ${searchQuery}`);
  }, 300);

  const handleInputChange = (e) => {
    const newQuery = e.target.value;
    setQuery(newQuery);

    // Throttle the search function
    throttleSearch(newQuery);
  };

  return (
    <input
      type="text"
      value={query}
      onChange={handleInputChange}
      placeholder="Search..."
    />
  );
}

// Throttle function to control the execution rate
function throttle(func, delay) {
  let lastExecuted = 0;
  return function (...args) {
    const now = Date.now();
    if (now - lastExecuted >= delay) {
      func(...args);
      lastExecuted = now;
    }
  };
}

export default SearchInput;


In this example, the throttle function ensures that the search function is called at most once every 300 milliseconds, preventing it from being called too frequently while the user is typing.






Debouncing
Debouncing, on the other hand, ensures that a function is only called after a certain period of inactivity. It postpones the execution until a pause in the event stream.

Example: Debouncing user input
Suppose you want to trigger an action after the user has stopped typing for 500 milliseconds.


import React, { useState } from 'react';

function AutoSaveInput() {
  const [text, setText] = useState('');

  // Define a debounced save function
  const debouncedSave = debounce((inputText) => {
    // Perform an auto-save action here
    console.log(`Auto-saving: ${inputText}`);
  }, 500);

  const handleInputChange = (e) => {
    const newText = e.target.value;
    setText(newText);

    // Debounce the save function
    debouncedSave(newText);
  };

  return (
    <input
      type="text"
      value={text}
      onChange={handleInputChange}
      placeholder="Type something..."
    />
  );
}

// Debounce function to control the execution delay
function debounce(func, delay) {
  let timeoutId;
  return function (...args) {
    clearTimeout(timeoutId);
    timeoutId = setTimeout(() => {
      func(...args);
    }, delay);
  };
}

export default AutoSaveInput;




In this example, the debounce function ensures that the auto-save function is called only when there's a 500-millisecond pause in typing. This prevents frequent auto-saving while the user is actively typing.

These are basic examples of throttling and debouncing in React. You can apply these techniques to various scenarios where you need to control the frequency of function execution in response to events.



Debouncing:

Delay Execution: Debouncing delays the execution of a function until there's a pause or gap in the triggering events. It ensures that the function is called only once after the specified delay has passed since the last event.
Use Case: Debouncing is useful when you want to perform an action after a continuous series of events has stopped or when you want to ensure that an action is triggered only after a user stops a certain activity (e.g., typing, scrolling, resizing) for a specified duration.
Example: Auto-saving a document or performing a search after the user has finished typing.
Throttling:

Controlled Execution Rate: Throttling limits the rate at which a function is called by allowing it to execute at a fixed interval or a maximum number of times within a given time frame.
Use Case: Throttling is useful when you want to ensure that a function is called at a controlled and steady rate, even if events are occurring frequently. It helps prevent a function from being called too frequently.
Example: Limiting the rate of API requests made during continuous user interaction, like scrolling or dragging.

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript throttling

Link to this answer
Share Copy Link

Contributed on Oct 04 2023

Amjad Saeed

0 Answers Avg Quality 2/10

Closely Related Answers

throttling function in javascript

Comment

function throttle(someFn, delay) {
  let flag = true;
  return (() => {
    if(flag){
      someFn();
      flag=false;
    }
    setTimeout(() => {flag=true;}, delay);
  })();
  
};

// usage
function someFn() {
  console.log('Hi')
};

throttle(someFn, 1000);

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: function functio

Link to this answer
Share Copy Link

Contributed on May 22 2022

Sutap Sahu

0 Answers Avg Quality 2/10

throttling in javascript

Contents

More Related Answers

throttling in javascript

Closely Related Answers

throttling function in javascript

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.