How convert html code to char in javascript?

Question

There are a lot of chars converted to HTML entities in input parameters.

To use it, I need to convert the HTML entities to chars to make it readable.

How I can do it in JavaScript (interesting in be-directional convertion)?

examples:

html-code | char
-----------------
  &#97;   |  a

How are your inputs ending up converted this way? Do you need to accept arbitrary HTML encoded characters, such as &? Are you in a browser, or in node? There is nowhere near enough information to accurately answer this. — user229044
– user229044 ♦, Commented Jul 17, 2020 at 2:02
Any solution that uses fromCharCode to decode HTML entities is wrong in the general case. Some characters happen to encode to &<ascii charcter code>; but many do not. — user229044
– user229044 ♦, Commented Jul 17, 2020 at 2:13
@meagar Yes, DOMParser would be better in case all entities need to be supported. — Unmitigated
– Unmitigated, Commented Jul 17, 2020 at 2:19

Unmitigated · Accepted Answer · 2020-07-17 02:14:12Z

1

Just remove the prefix ("&#") and suffix (";") and use String.fromCharCode.

function entityToChar(ent){
  return String.fromCharCode(ent.slice(2,-1));
}
console.log(entityToChar("&#97;"));

If you need to support arbitrary HTML entities, you can use the DOMParser API.

function entityToChar(ent){
  return new DOMParser().parseFromString(ent, "text/html").documentElement.textContent;
}
console.log(entityToChar("&amp;"));

edited Jul 17, 2020 at 2:14

answered Jul 17, 2020 at 2:03

Unmitigated

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Comments

The KNVB · Accepted Answer · 2020-07-17 02:02:08Z

1

You may try my code.

var div=document.createElement("div");
div.innerHTML="&#97;";
console.log(div.textContent);

answered Jul 17, 2020 at 2:02

The KNVB

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Comments

Santa · Accepted Answer · 2020-07-17 02:06:51Z

0

You can use fromCharCode() for this

var a = "&#97;";

var b = String.fromCharCode(a.slice(2,-1));

console.log(b);

answered Jul 17, 2020 at 2:06

Santa

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Comments

Joundill · Accepted Answer · 2020-07-18 02:54:41Z

0

https://www.w3schools.com/jsref/jsref_fromcharcode.asp

Use fromCharCode(). But you have to use only number. From your examples '&#97' just cut '&#' out and String.fromCharCode(97).

edited Jul 18, 2020 at 2:54

Joundill

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answered Jul 17, 2020 at 2:06

Nopphawit Karunlanchakorn

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