How Can I Preserve HTML Encoding When Reading from Input Fields in JavaScript?

Preserving HTML Encoding When Reading from Input Field

When extracting values from hidden fields using JavaScript, it's common to encounter situations where HTML encoding is lost, resulting in undesired string values. In such cases, it becomes essential to maintain the original encoded format.

Fortunately, several approaches can be employed to HTML-encode strings. One effective method is to leverage the DOMParser API, offering a more modern and reliable solution:

const encodedValue = new DOMParser().parseFromString(value, "text/html").body.textContent;

Alternatively, if legacy compatibility is desired, the following jQuery-based functions provide similar functionality:

function htmlEncode(value) {
  return $("<textarea>").text(value).html();
}

function htmlDecode(value) {
  return $("<textarea>").html(value).text();
}

These functions utilize a hidden textarea element to manipulate the string. By setting its textContent to the desired value, the browser automatically HTML-encodes the content. Subsequently, the encoded HTML can be retrieved through the innerHTML property.

For html decoding, the process is reversed, where the encoded HTML is set as the innerHTML of the textarea, and the decoded textContent is obtained.

By employing one of these techniques, it's possible to extract HTML-encoded values from input fields while retaining the original formatting, ensuring accurate string representation.

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