How to store custom data in HTML as private data for the page or application?-HTML Tutorial-php.cn

How to store custom data in HTML as private data for the page or application?

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Release： 2023-09-12 14:25:02

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How to store custom data in HTML as private data for the page or application?

Custom attributes are specially designed attributes that are not included in the standard HTML5 attributes. They allow us to customize HTML tags by adding our own data.

A custom attribute is any attribute that starts with data-. We can embed custom attributes on all HTML components using data-* attributes.

Syntax: HTML

In HTML, the syntax of data-* attributes is relatively simple. Every element starting with data- is a data-* attribute.

<sample_data>
   id = “sample”
   data-index = 1
   data-row = 23
   data-column = 44
</sample_data>

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Syntax: Use JavaScript to access

Accessing these data properties using JavaScript is also relatively simple. We can use getAttribute() with its full HTML name, which can be read using the dataset attribute.

const article = document.querySelector('#sample');
sample_data.dataset.index;
sample_data.dataset.row;
sample_data.dataset.column;

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Syntax: Access using CSS

Use the CSS attr() function to access data.

sample_data::before {
   content: attr(data-index);
}

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The following are examples...

The Chinese translation of

Example

is:

Example

In the following example, we use JavaScript to read the value of the attribute.

<!DOCTYPE html>
<html>
<body>
   <h1>Result</h1>
   <ul>
      <li onclick="showPosition(this)"
         id="Siddarth" data-position="winner">
         Siddarth
      </li>
      <li onclick="showPosition(this)"
         id="Arjun" data-position="runner up">
         Arjun
      </li>
      <li onclick="showPosition(this)"
         id="Badri" data-position="third">
         Badri
      </li>
      <li onclick="showPosition(this)"
         id="Nanda" data-position="lost">
         Nanda
      </li>
   </ul>
   <script>
      function showPosition(runner) {
         var position = runner.getAttribute("data-position");
         alert("The " + runner.innerHTML + " is " + position + ".");
      }
   </script>
</body>
</html>

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Output

When the above script is executed, it will generate an output of a list of names containing some data.

When you try to click on any of the names, the function gets the data and displays an alert box showing the custom data we used.

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