User:Sur/common.js

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function storeValue() {
        // Get the input value
        var inputValue = document.getElementById('inputValue').value;

        // Use JavaScript to dynamically update the #var (normally handled by PHP in the wiki environment)
        mw.loader.using('mediawiki.util', function () {
            var updatedText = '{{#vardefine:storedValue|' + inputValue + '}}';
            mw.util.addCSS(updatedText);
        });

        // Optional: Reload the page to reflect the new stored value in the displayed content
        location.reload();
    }