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Exercises","html-quiz-practice-exercises",{"data":361},{"id":293,"title":294,"slug":295,"content":362,"course":363,"subcategory":364,"author":365,"reading_time_minutes":12,"cornerstone":52,"schema_type":371,"faq_json":5,"video_url":5,"canonical_url":372,"meta_title":373,"meta_description":374,"og_image":5,"toc_json":375,"code_examples":399,"quiz":5,"exercises":408,"published_at":5,"updated_at":415,"prev":416,"next":417},"\u003Ch2 id=\"html-drag-drop-api\">HTML Drag & Drop API\u003C\u002Fh2>\u003Cp>The Drag and Drop API is a native browser feature that lets users grab an element with the mouse, drag it across the page, and drop it onto a target — no external library required. It powers file-upload dropzones, sortable to-do lists, kanban boards (like Trello), and image reordering tools.\u003C\u002Fp>\u003Ch3 id=\"making-an-element-draggable\">Making an Element Draggable\u003C\u002Fh3>\u003Cp>Any HTML element becomes draggable simply by adding the \u003Ccode>draggable=\"true\"\u003C\u002Fcode> attribute. Images and links are draggable by default in most browsers, but other elements need this attribute explicitly.\u003C\u002Fp>\u003Ch3 id=\"the-drag-event-lifecycle\">The Drag Event Lifecycle\u003C\u002Fh3>\u003Cul>\n\u003Cli>\u003Cstrong>dragstart\u003C\u002Fstrong> — fired on the dragged element when the drag begins.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>drag\u003C\u002Fstrong> — fires continuously while dragging.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>dragenter\u003C\u002Fstrong> \u002F \u003Cstrong>dragover\u003C\u002Fstrong> — fired on the drop target as the dragged item passes over it (you must call \u003Ccode>preventDefault()\u003C\u002Fcode> on \u003Ccode>dragover\u003C\u002Fcode> to allow dropping).\u003C\u002Fli>\n\u003Cli>\u003Cstrong>dragleave\u003C\u002Fstrong> — fired when the dragged item leaves the drop target.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>drop\u003C\u002Fstrong> — fired on the target when the item is released; this is where you handle the actual data transfer.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>dragend\u003C\u002Fstrong> — fired on the original dragged element once the drag operation finishes.\u003C\u002Fli>\n\u003C\u002Ful>\u003Ch3 id=\"transferring-data-with-datatransfer\">Transferring Data with dataTransfer\u003C\u002Fh3>\u003Cp>The \u003Ccode>dataTransfer\u003C\u002Fcode> object carried by every drag event lets you attach data (like an element's ID or a piece of text) during \u003Ccode>dragstart\u003C\u002Fcode>, and read it back during \u003Ccode>drop\u003C\u002Fcode> — this is how the browser knows what was actually dragged.\u003C\u002Fp>\u003Ch3 id=\"building-a-drop-zone\">Building a Drop Zone\u003C\u002Fh3>\u003Cp>A drop zone is just a normal element that listens for \u003Ccode>dragover\u003C\u002Fcode> (with \u003Ccode>preventDefault()\u003C\u002Fcode>) and \u003Ccode>drop\u003C\u002Fcode>. This same pattern is also used for native file uploads, where users drag files from their desktop directly into the browser.\u003C\u002Fp>\u003Ch3 id=\"common-use-cases\">Common Use Cases\u003C\u002Fh3>\u003Cp>Sortable lists, kanban\u002Ftask boards, drag-to-upload file zones, image galleries with reordering, and visual page builders all rely on this API.\u003C\u002Fp>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><div id='drag1' draggable='true' style='width:100px;padding:10px;background:#3498db;color:#fff;'>Drag Me<\u002Fdiv>\n\n<div id='dropzone' style='width:200px;height:100px;border:2px dashed #999;margin-top:20px;'>Drop Here<\u002Fdiv>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-javascript\">\u003Cpre>\u003Ccode>const dragItem = document.getElementById('drag1');\nconst dropZone = document.getElementById('dropzone');\n\ndragItem.addEventListener('dragstart', (e) => {\n  e.dataTransfer.setData('text\u002Fplain', e.target.id);\n});\n\ndropZone.addEventListener('dragover', (e) => {\n  e.preventDefault(); \u002F\u002F required to allow dropping\n});\n\ndropZone.addEventListener('drop', (e) => {\n  e.preventDefault();\n  const draggedId = e.dataTransfer.getData('text\u002Fplain');\n  const draggedEl = document.getElementById(draggedId);\n  dropZone.appendChild(draggedEl);\n});\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>",{"name":15,"slug":38},{"name":285,"slug":286},{"slug":366,"display_name":367,"job_title":5,"short_bio":5,"expertise_tags":368,"headshot":5,"long_bio":5,"credentials":5,"twitter_url":5,"linkedin_url":5,"github_url":5,"personal_website_url":5,"other_sameas_urls":5,"topics":369,"posts":370},"badar-khalil","Badar Khalil",[],[],[],"Article","https:\u002F\u002Fwpfsharp.com\u002Ftopics\u002Fhtml-drag-and-drop-api","HTML Drag and Drop API: Build Draggable UI","Learn the native HTML5 Drag and Drop API — draggable elements, drag events, dataTransfer, and building drop zones with practical code examples.",[376],{"id":377,"text":294,"level":12,"children":378},"html-drag-drop-api",[379,383,387,391,395],{"id":380,"text":381,"level":57,"children":382},"making-an-element-draggable","Making an Element Draggable",[],{"id":384,"text":385,"level":57,"children":386},"the-drag-event-lifecycle","The Drag Event Lifecycle",[],{"id":388,"text":389,"level":57,"children":390},"transferring-data-with-datatransfer","Transferring Data with dataTransfer",[],{"id":392,"text":393,"level":57,"children":394},"building-a-drop-zone","Building a Drop Zone",[],{"id":396,"text":397,"level":57,"children":398},"common-use-cases","Common Use Cases",[],[400,404],{"id":401,"language":16,"code":402,"is_editable":403},138,"\u003Cdiv id='drag1' draggable='true' style='width:100px;padding:10px;background:#3498db;color:#fff;'>Drag Me\u003C\u002Fdiv>\n\n\u003Cdiv id='dropzone' style='width:200px;height:100px;border:2px dashed #999;margin-top:20px;'>Drop Here\u003C\u002Fdiv>",true,{"id":405,"language":406,"code":407,"is_editable":403},139,"javascript","const dragItem = document.getElementById('drag1');\nconst dropZone = document.getElementById('dropzone');\n\ndragItem.addEventListener('dragstart', (e) => {\n  e.dataTransfer.setData('text\u002Fplain', e.target.id);\n});\n\ndropZone.addEventListener('dragover', (e) => {\n  e.preventDefault(); \u002F\u002F required to allow dropping\n});\n\ndropZone.addEventListener('drop', (e) => {\n  e.preventDefault();\n  const draggedId = e.dataTransfer.getData('text\u002Fplain');\n  const draggedEl = document.getElementById(draggedId);\n  dropZone.appendChild(draggedEl);\n});",[409],{"id":281,"title":410,"slug":411,"prompt":412,"starter_code":413,"expected_output":414,"language":406,"order_index":23},"Highlight the Drop Zone","highlight-the-drop-zone","Add a 'dragenter' listener on the drop zone that changes its background color to light green, and a 'dragleave' listener that resets it back to its original color.","dropZone.addEventListener('dragenter', (e) => {\n  \u002F\u002F TODO: change background color\n});\n\ndropZone.addEventListener('dragleave', (e) => {\n  \u002F\u002F TODO: reset background color\n});","Background turns light green on dragenter and resets on dragleave.","2026-09-27T18:50:49+00:00",{"id":289,"slug":291,"title":290},{"id":297,"slug":299,"title":298}]