From 482fd7adee5e9e0990bf5904ed7d754d315de649 Mon Sep 17 00:00:00 2001
From: Arno Richter <oelna@oelna.de>
Date: Wed, 21 Dec 2022 15:05:28 +0100
Subject: first attempt at image attachments!

---
 js/microblog.js | 193 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 js/microblog.js

(limited to 'js/microblog.js')

diff --git a/js/microblog.js b/js/microblog.js
new file mode 100644
index 0000000..f7963e3
--- /dev/null
+++ b/js/microblog.js
@@ -0,0 +1,193 @@
+'use strict';
+
+document.documentElement.classList.remove('no-js');
+
+const textarea = document.querySelector('textarea[name="content"]');
+const charCount = document.querySelector('#count');
+
+if (textarea) {
+	const maxCount = parseInt(textarea.getAttribute('maxlength'));
+
+	if (textarea.value.length > 0) {
+		const textLength = [...textarea.value].length;
+		charCount.textContent = maxCount - textLength;
+	} else {
+		charCount.textContent = maxCount;
+	}
+
+	textarea.addEventListener('input', function () {
+		const textLength = [...this.value].length;
+
+		charCount.textContent = maxCount - textLength;
+	}, false);
+}
+
+const postForm = document.querySelector('#post-new-form');
+let useDragDrop = (!!window.FileReader && 'draggable' in document.createElement('div'));
+useDragDrop = true;
+if (postForm) {
+	const droparea = postForm.querySelector('#post-droparea');
+	const attachmentsInput = postForm.querySelector('#post-attachments');
+	const data = {
+		'attachments': []
+	};
+
+
+	if (droparea && attachmentsInput) {
+		if (useDragDrop) {
+			console.log('init with modern file attachments');
+
+			const list = postForm.querySelector('#post-attachments-list');
+			list.addEventListener('click', function (e) {
+				e.preventDefault();
+
+				// remove attachment
+				if (e.target.nodeName.toLowerCase() == 'li') {
+					const filename = e.target.textContent;
+
+					data.attachments = data.attachments.filter(function (ele) {
+						return ele.name !== filename;
+					});
+
+					e.target.remove();
+				}
+			});
+
+			droparea.classList.remove('hidden');
+			document.querySelector('#post-attachments-label').classList.add('hidden');
+
+			droparea.ondragover = droparea.ondragenter = function (e) {
+				e.stopPropagation();
+				e.preventDefault();
+
+				e.dataTransfer.dropEffect = 'copy';
+				e.target.classList.add('drag');
+			};
+
+			droparea.ondragleave = function (e) {
+				e.target.classList.remove('drag');
+			};
+
+			droparea.onclick = function (e) {
+				e.preventDefault();
+
+				// make a virtual file upload
+				const input = document.createElement('input');
+				input.type = 'file';
+				input.setAttribute('multiple', '');
+				input.setAttribute('accept', 'image/*'); // only images for now
+
+				input.onchange = e => {
+					processSelectedFiles(e.target.files);
+				}
+
+				input.click();
+			};
+
+			function processSelectedFiles(files) {
+				if (!files || files.length < 1) return;
+
+				for (const file of files) {
+					const found = data.attachments.find(ele => ele.name === file.name);
+					if(found) continue; // skip existing attachments
+
+					data.attachments.push({
+						'name': file.name,
+						// todo: maybe some better form of dupe detection here?
+						'file': file
+					});
+
+					const li = document.createElement('li');
+					li.textContent = file.name;
+
+					const reader = new FileReader();
+
+					if(file.type.startsWith('image/')) {
+						reader.onload = function (e) {
+							var dataURL = e.target.result;
+
+							const preview = document.createElement('img');
+							preview.classList.add('file-preview');
+							preview.setAttribute('src', dataURL);
+
+							li.prepend(preview);
+						};
+						reader.onerror = function (e) {
+							console.log('An error occurred during file input: '+e.target.error.code);
+						};
+
+						reader.readAsDataURL(file);
+					}
+
+					list.append(li);
+				}
+			}
+
+			droparea.ondrop = function (e) {
+				if (e.dataTransfer) {
+					e.preventDefault();
+					e.stopPropagation();
+
+					processSelectedFiles(e.dataTransfer.files);
+				}
+
+				e.target.classList.remove('drag');
+			};
+
+			postForm.addEventListener('submit', async function (e) {
+				e.preventDefault();
+
+				const postFormData = new FormData();
+
+				postFormData.append('content', postForm.querySelector('[name="content"]').value);
+
+				for (const attachment of data.attachments) {
+					postFormData.append('attachments[]', attachment.file);
+				}
+
+				/*
+				for (const pair of postFormData.entries()) {
+					console.log(`${pair[0]}, ${pair[1]}`);
+				}
+				*/
+
+				const response = await fetch(postForm.getAttribute('action'), {
+					body: postFormData,
+					method: 'POST'
+				});
+
+				if (response.ok && response.status == 200) {
+					const txt = await response.text();
+					// console.log(response, txt);
+					window.location.href = postForm.dataset.redirect;
+				} else {
+					console.warn('error during post submission!', response);
+				}
+			});
+		} else {
+			// use the native file input dialog
+			// but enhanced
+			if (attachmentsInput) {
+				console.log('init with classic file attachments');
+
+				attachmentsInput.addEventListener('change', function (e) {
+					console.log(e.target.files);
+
+					const list = postForm.querySelector('#post-attachments-list');
+					list.replaceChildren();
+
+					for (const file of e.target.files) {
+						const li = document.createElement('li');
+						li.textContent = file.name;
+						list.append(li);
+					}
+				});
+			}
+		}
+	}
+}
+
+// better rounded corners
+if ('paintWorklet' in CSS) {
+	// CSS.paintWorklet.addModule('./js/squircle.js');
+}
-- 
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