Decode HTML entities in JavaScript?

Sample conversions:
 & -> `&`
 >  -> `>`

Any small library function that can handle this?

Answers


I have on my utility belt this tiny function always:

function htmlDecode(input){
  var e = document.createElement('div');
  e.innerHTML = input;
  return e.childNodes[0].nodeValue;
}

htmlDecode("&"); // "&"
htmlDecode(">"); // ">"

It will work for all HTML Entities.

Edit: Since you aren't in a DOM environment, I think you will have to do it by the "hard" way:

function htmlDecode (input) {
  return input.replace(/&/g, "&")
              .replace(/&lt;/g, "<")
              .replace(/&gt;/g, ">");
              //...
}

If you don't like the chained replacements, you could build an object to store your entities, e.g.:

function htmlDecode (input) {
  var entities= {
    "&amp;": "&",
    "&lt;": "<",
    "&gt;": ">"
    //....
  };

  for (var prop in entities) {
    if (entities.hasOwnProperty(prop)) {
      input = input.replace(new RegExp(prop, "g"), entities[prop]);
    }
  }
  return input;
}

Looks like this will do:

function html_entity_decode(s) {
  var t=document.createElement('textarea');
  t.innerHTML = s;
  var v = t.value;
  t.parentNode.removeChild(t);
  return v;
}

Source


A robust HTML entity encoder/decoder written in JavaScript.

https://mths.be/he

he (for “HTML entities”) is a robust HTML entity encoder/decoder written in JavaScript. It supports all standardized named character references as per HTML, handles ambiguous ampersands and other edge cases just like a browser would, has an extensive test suite, and — contrary to many other JavaScript solutions — he handles astral Unicode symbols just fine. An online demo is available.


Need Your Help

How does geographic lookup by IP work?

dns ip ip-geolocation

Is which IPs are assigned to which ISPs public information? How do geo IP services obtain this information and maintain this information?

Using .NET, how can you find the mime type of a file based on the file signature not the extension

c# mime mime-types

I am looking for a simple way to get a mime type where the file extension is incorrect or not given, something similar to this question only in .Net.