[issue-nextcloud#39] It is now possible to download group of contacts.

src/views/Contacts.vue

@@ -145,7 +145,14 @@ export default {
 					},
 					text: group.name,
 					utils: {
-						counter: group.contacts.length
+						counter: group.contacts.length,
+						actions: [
+							{
+								icon: 'icon-download',
+								text: 'Download',
+								action: this.downloadGroup(group)
+							}
+						]
 					}
 				}
 			}).sort(function(a, b) {
@@ -319,6 +326,27 @@ export default {
 		},
 		resetSearch() {
 			this.search('')
+		},
+
+		/* DOWNLOAD */
+		downloadGroup(group) {
+			// create result
+			const contacts = this.contacts
+			const result = group.contacts.map(uid => contacts[uid].dav.data).join('')
+			// return result
+			return function() {
+				// create element
+				let element = document.createElement('a')
+				element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(result))
+				element.setAttribute('download', group.name + '.vcf')
+				element.style.display = 'none'
+				// add element to dom
+				document.body.appendChild(element)
+				// click on element
+				element.click()
+				// remove element from dom
+				document.body.removeChild(element)
+			}
 		}
 	}
 }