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JavaScript can add interaction to an HTML interface. Keep the page usable when supporting scripts fail. Connect a script Place this before the closing body tag: <script src="js/app.js"></script> Or use defer in the page head: <script src="js/app.js" defer></...

Events allow a script to respond to user actions. <label for="team-filter">Filter teams</label> <input id="team-filter" type="search"> <p id="filter-status" role="status"></p> const filter = document.querySelector("#team-filter"); const status = document.query...

Client-side filtering can help users explore data already present in the browser. Database filtering remains preferable for large or permission-sensitive datasets. const rows = [...document.querySelectorAll("[data-team-row]")]; const search = document.querySel...

Dynamic interfaces must communicate changes without removing keyboard access or context. Status message <p id="save-status" role="status" aria-live="polite"></p> const status = document.querySelector("#save-status"); status.textContent = "Changes saved."; Use ...

PHP can query and process database data, then pass a small prepared result to JavaScript for presentation. <?php $labels = array_column($rows, "team_name"); $points = array_map("intval", array_column($rows, "points")); ?> <script> const labels = <?= json_encod...