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📜  ExtractElementByIdFromString(HTMLString, IdString) - TypeScript (1)

📅  最后修改于: 2023-12-03 14:41:05.445000             🧑  作者: Mango

ExtractElementByIdFromString(HTMLString, IdString) - TypeScript

ExtractElementByIdFromString is a TypeScript function that extracts an element with the specified ID from an HTML string.

Signature
function ExtractElementByIdFromString(HTMLString: string, IdString: string): Element;
Parameters

HTMLString: string

A string containing valid HTML code.

IdString: string

The ID of the element to be extracted from the HTML string.

Return Value

The function returns an Element object that represents the extracted element, or null if no element was found with the specified ID in the HTML string.

Example
const HTML = `
  <html>
    <body>
      <div id="myDiv">Hello, World!</div>
    </body>
  </html>
`;

const div = ExtractElementByIdFromString(HTML, 'myDiv');

console.log(div.textContent); // Output: "Hello, World!"
Implementation

The implementation of ExtractElementByIdFromString involves two main steps:

  1. Parsing the HTML string into a Document object.
  2. Retrieving the element with the specified ID from the Document object.

The parsing of the HTML string is achieved using the DOMParser interface, which is implemented by modern web browsers. Once the Document object is obtained, the element with the specified ID is retrieved using the getElementByID method.

function ExtractElementByIdFromString(HTMLString: string, IdString: string): Element {
  const parser = new DOMParser();
  const doc = parser.parseFromString(HTMLString, 'text/html');
  const element = doc.getElementById(IdString);
  return element;
}
Conclusion

ExtractElementByIdFromString is a TypeScript function that allows developers to extract an element with a specific ID from an HTML string. Its simplicity and ease of use make it an essential utility function for any web developer working with TypeScript.