Encodeuricomponent function in javascript

JavaScript: encodeURIComponent functions

The encodeURIComponent function is used to encodes a Uniform Resource Identifier (URI) component by replacing each instance of certain characters by one, two or three escape sequences representing the UTF-8 encoding of the character.

encodeURIComponent escapes all characters except the following:
alphabetic, decimal digits, — _ . ! ~ * ‘ ( )

str1: A complete, encoded Uniform Resource Identifier.

Example encodeURIComponent Functions

In the following web document encodeURIComponent() function is used to encode a URL parameter.

JavaScript Code:

xyz = encodeURIComponent("http://myw3r.com/x=31&y=21"); //Lets create an URL url1 = "https://w3resource.com/xyz=" + xyz + "&xyz3=45"; //Here is the complete URL console.log(url1); 

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JavaScript: Tips of the Day

How do I loop through or enumerate a JavaScript object?

You can use the for-in loop as shown by others. However, you also have to make sure that the key you get is an actual property of an object, and doesn’t come from the prototype.

var p = < "p1": "value1", "p2": "value2", "p3": "value3" >; for (var key in p) < if (p.hasOwnProperty(key)) < console.log(key + " ->" + pEncodeuricomponent function in javascript); > >

For-of with Object.keys() alternative:

var p = < 0: "value1", "b": "value2", key: "value3" >; for (var key of Object.keys(p)) < console.log(key + " ->" + pEncodeuricomponent function in javascript) >

Notice the use of for-of instead of for-in, if not used it will return undefined on named properties, and Object.keys() ensures the use of only the object’s own properties without the whole prototype-chain properties

Using the new Object.entries() method:

Note: This method is not supported natively by Internet Explorer. You may consider using a Polyfill for older browsers.

const p = < "p1": "value1", "p2": "value2", "p3": "value3" >; for (let Encodeuricomponent function in javascript of Object.entries(p)) < console.log(`$: $`); >

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encodeURIComponent()

The encodeURIComponent() function encodes a URI by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character (will only be four escape sequences for characters composed of two surrogate characters). Compared to encodeURI() , this function encodes more characters, including those that are part of the URI syntax.

Try it

Syntax

encodeURIComponent(uriComponent) 

Parameters

A string to be encoded as a URI component (a path, query string, fragment, etc.). Other values are converted to strings.

Return value

A new string representing the provided uriComponent encoded as a URI component.

Exceptions

Thrown if uriComponent contains a lone surrogate.

Description

encodeURIComponent() is a function property of the global object.

encodeURIComponent() uses the same encoding algorithm as described in encodeURI() . It escapes all characters except:

Compared to encodeURI() , encodeURIComponent() escapes a larger set of characters. Use encodeURIComponent() on user-entered fields from forms POST ‘d to the server — this will encode & symbols that may inadvertently be generated during data entry for special HTML entities or other characters that require encoding/decoding. For example, if a user writes Jack & Jill , without encodeURIComponent() , the ampersand could be interpreted on the server as the start of a new field and jeopardize the integrity of the data.

For application/x-www-form-urlencoded , spaces are to be replaced by + , so one may wish to follow a encodeURIComponent() replacement with an additional replacement of %20 with + .

Examples

Encoding for Content-Disposition and Link headers

The following example provides the special encoding required within UTF-8 Content-Disposition and Link server response header parameters (e.g., UTF-8 filenames):

const fileName = "my file(2).txt"; const header = `Content-Disposition: attachment; filename*=UTF-8''$encodeRFC5987ValueChars( fileName, )>`; console.log(header); // "Content-Disposition: attachment; filename*=UTF-8''my%20file%282%29.txt" function encodeRFC5987ValueChars(str)  return ( encodeURIComponent(str) // The following creates the sequences %27 %28 %29 %2A (Note that // the valid encoding of "*" is %2A, which necessitates calling // toUpperCase() to properly encode). Although RFC3986 reserves "!", // RFC5987 does not, so we do not need to escape it. .replace( /['()*]/g, (c) => `%$c.charCodeAt(0).toString(16).toUpperCase()>`, ) // The following are not required for percent-encoding per RFC5987, // so we can allow for a little better readability over the wire: |`^ .replace(/%(7C|60|5E)/g, (str, hex) => String.fromCharCode(parseInt(hex, 16)), ) ); > 

Encoding for RFC3986

The more recent RFC3986 reserves !, ‘, (, ), and *, even though these characters have no formalized URI delimiting uses. The following function encodes a string for RFC3986-compliant URL component format. It also encodes [ and ], which are part of the IPv6 URI syntax. An RFC3986-compliant encodeURI implementation should not escape them, which is demonstrated in the encodeURI() example.

function encodeRFC3986URIComponent(str)  return encodeURIComponent(str).replace( /[!'()*]/g, (c) => `%$c.charCodeAt(0).toString(16).toUpperCase()>`, ); > 

Encoding a lone high surrogate throws

A URIError will be thrown if one attempts to encode a surrogate which is not part of a high-low pair. For example:

// High-low pair OK encodeURIComponent("\uD800\uDFFF"); // "%F0%90%8F%BF" // Lone high surrogate throws "URIError: malformed URI sequence" encodeURIComponent("\uD800"); // Lone low surrogate throws "URIError: malformed URI sequence" encodeURIComponent("\uDFFF"); 

You can use String.prototype.toWellFormed() , which replaces lone surrogates with the Unicode replacement character (U+FFFD), to avoid this error. You can also use String.prototype.isWellFormed() to check if a string contains lone surrogates before passing it to encodeURIComponent() .

Specifications

Browser compatibility

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See also

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This page was last modified on May 3, 2023 by MDN contributors.

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encodeURIComponent

Метод encodeURIComponent заменяет все символы, кроме:
символов латинского алфавита, десятичных цифр и — _ . ! ~ * ‘ ( ) .

Чтобы избежать некорректных запросов к серверу, метод encodeURIComponent следует вызывать на каждом введенном пользователем параметре, который будет передан как часть URI.

Например, пользователь может ввести «me&time=5» в переменной label . Без использования encodeURIComponent соответствующая компонента запроса будет иметь вид label=me&time=5 .
Вместо одного значения label появилось два значения:
label=me и time=5 .

Чтобы этого избежать, кодируйте данные перед передачей в URI:

label = 'me&you' uri = uri + '&label=' + encodeURIComponent(label)

См. также

У меня в FireFox encodeUriComponent оставляет русские буквы русскими

URI у вас закодирован, но уже сам браузер декодирует его обратно, для наглядности, чтобы в адресной строке вы видели текст, а не текст %D0%2F .

Что-то я не нашел в списке глобальных функций похожую на
encodeURIComponent функцию escape и обратную ей unescape. В чем разница между encodeURIComponent и escape?

Из своего опыта я заметил, к примеру, что escape кодирует пробел как %20, а если данные передаются из формы просто по submit, то пробел заменяется на ‘+’. Если применить unescape, то ‘+’ не будет заменен на пробел (по крайней мере, в FireFox).

а что у нас с поддержкой мобильными браузерами?

Надо видно посидеть разобраться. Что-то я ничего пока не могу понять. Да к тому же не особо силён в программировании. Пойду читать азбуку.

Подскажите, а как при помощи JavaScript вычислить человека по IP?

function findHumanByIP(HumanIPaddress) var db = window.connect(ANB-people-database);
var human = findHuman(db, HumanIPaddress);
kickAss(human);
>

Можно kickAss() еще глянуть?

/*. */ window.connect(ANB-people-database);

посмеялся
вот продолжение:

Помогите разобраться.
Посылаю запрос формируя адрес так

var link = «a:b:c»; var url = «documents/test.html» + «&link :», то выскакивает ошибка, 404. Если ставлю, например точки «a.b.c», то всё нормально работает.

Почему такая нелюбовь к двоеточиям?

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The encodeURIComponent() Function in JavaScript

The encodeURIComponent() function in JavaScript allows you to encode special characters in your query string that would otherwise change the meaning of your query string.

Characters like + , / , and & are special. For example, suppose you wanted to send an HTTP request with the user’s email address in the query string.

fetch(`https://httpbin.org/get?email=$ `);

What happens if email has an & , like ‘john@gmail.com&param=somethingelse’ ? That would add an extra parameter param=somethingelse to the query string.

encodeURIComponent() ensures that email . For example:

const email = 'john@gmail.com¶m=somethingelse'; await fetch(`https://httpbin.org/get?email?email=$ `). then((res) => res.json()); // await fetch(`https://httpbin.org/get?email=$encodeURIComponent(email)>`). then((res) => res.json()); // 

Do not encode the entire url! Just encode the individual values in the query string.

Axios

If you’re using Axios query params, you don’t need to use encodeURIComponent() . Axios calls encodeURIComponent() for you.

const axios = require('axios'); // Equivalent to `axios.get('https://httpbin.org/get?answer=42')` const res = await axios.get('https://httpbin.org/get', < params: < answer: 42 > >); res.data.args; // 

More Fundamentals Tutorials

Источник

JavaScript encodeURIComponent()

The encodeURIComponent() method encodes a URI component.

The encodeURIComponent() method encodes special characters including: , / ? : @ & = + $ #

Note

Use the decodeURIComponent() function to decode an encoded URI component.

See Also:

The encodeURI() method to encode a URI

The decodeURI() method to decode a URI

Syntax

Parameters

Return Value

Browser Support

encodeURIComponent() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:

Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

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