Look up Javascript in JSON file?

TheLinuxerByTheLinuxer

I would like to program a JavaScript function that reads a text from an input field (HTML), then looks up each letter individually in a JSON file and finally outputs the hexadecimal code corresponding to the letters, which is assigned to the letters in the JSON file, into another text field (HTML).

Reading and outputting is not a problem either, but I don't know how to make the JavaScript code work with the JSON file because I've never done it before and don't fully understand it.

Does anyone know what the code for this is and can explain it in a way that is understandable?

(1 votes)
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Suiram1
Suiram1
1 year ago

If you need the character in the Hex code assigned to ASCII, you do not need to use an extra JSON. There you can easily .ToString(16) retrieve this character into its Hex code.

If this is ‘custom’ hex codes, you can create a JSON in the following format:

{
    "A": "0x0",
    "B": "0x1",
    "C": "0x2",
    "D": "0x3"
}

You can always use the text content of JSON files JSON.parse() to convert an object.
In the example, I assume that it is a file that you run the JS in the browser:

fetch('hexCodes.json')
    .then(response => response.json())
    .then(data => {
        // Hier kannst du die Daten weiter verarbeiten

        // Beispiel
        var char = 'A';
        var hexCode = data[char]
    })
    .catch(error => console.error('Fehler beim Laden der Datei:', error));

lg Suiram1

1
regex9
regex9
1 year ago

You can remove the JSON object by using the Fetch API. It can only request the file content via HTTP request and then map it directly onto a JavaScript object.

Example:

fetch("URL to JSON file")
  .then(response => response.json())
  .then(data => {
    /* do something ... */
  });

The data-Variable shows the object mentioned. Within the callback you can now iterate via the text input and drag the corresponding values from the object. So about that.

const token = // get value of input field ...
let result = "";

for (const symbol of token) {
  if (data.hasOwnProperty(symbol)) {
    result += data[symbol];
  }
}

// write result back to some input field ...
2