Rewrite markdown editor in vanilla Javascript

1 files changed, 129 insertions, 147 deletions

diff --git a/assets/js/components/text-editor.js b/assets/js/components/text-editor.js
index 625ade0d..5011318b 100644
--- a/assets/js/components/text-editor.js
+++ b/assets/js/components/text-editor.js
@@ -1,158 +1,140 @@
-Vue.component('texteditor', {
-    props: ['text', 'name', 'labelPreview', 'labelWrite', 'placeholder', 'css', 'tabindex', 'required', 'autofocus'],
-    template:
-        '<div class="text-editor">' +
-        '<div class="text-editor-toolbar">' +
-        '<button v-if="!preview" v-on:click.prevent="togglePreview"><i class="fa fa-fw fa-eye"></i>{{ labelPreview }}</button>' +
-        '<button v-if="preview" v-on:click.prevent="toggleEditor"><i class="fa fa-fw fa-pencil-square-o"></i>{{ labelWrite }}</button>' +
-        '<button :disabled="isPreview" v-on:click.prevent="insertBoldTag"><i class="fa fa-bold fa-fw"></i></button>' +
-        '<button :disabled="isPreview" v-on:click.prevent="insertItalicTag"><i class="fa fa-italic fa-fw"></i></button>' +
-        '<button :disabled="isPreview" v-on:click.prevent="insertStrikethroughTag"><i class="fa fa-strikethrough fa-fw"></i></button>' +
-        '<button :disabled="isPreview" v-on:click.prevent="insertQuoteTag"><i class="fa fa-quote-right fa-fw"></i></button>' +
-        '<button :disabled="isPreview" v-on:click.prevent="insertBulletListTag"><i class="fa fa-list-ul fa-fw"></i></button>' +
-        '<button :disabled="isPreview" v-on:click.prevent="insertCodeTag"><i class="fa fa-code fa-fw"></i></button>' +
-        '</div>' +
-        '<div v-show="!preview" class="text-editor-write-area">' +
-        '<textarea ' +
-            'v-model="text" ' +
-            'name="{{ name }}" ' +
-            'id="{{ getId }}" ' +
-            'class="{{ css }}" ' +
-            'tabindex="{{ tabindex }}" ' +
-            ':autofocus="hasAutofocus" ' +
-            'placeholder="{{ placeholder }}" ' +
-        '></textarea>' +
-        '</div>' +
-        '<div v-show="preview" class="text-editor-preview-area markdown">{{{ renderedText }}}</div>' +
-        '</div>'
-    ,
-    data: function() {
-        return {
-            id: null,
-            preview: false,
-            renderedText: '',
-            textarea: null,
-            selectionStart: 0,
-            selectionEnd: 0
-        };
-    },
-    ready: function() {
-        this.textarea = document.getElementById(this.id);
-    },
-    computed: {
-        hasAutofocus: function() {
-            return this.autofocus === '1';
-        },
-        isPreview: function() {
-            return this.preview;
-        },
-        getId: function() {
-            if (! this.id) {
-                var i = 0;
-                var uniqueId;
-
-                while (true) {
-                    i++;
-                    uniqueId = 'text-editor-textarea-' + i;
-
-                    if (! document.getElementById(uniqueId)) {
-                        break;
-                    }
-                }
+KB.component('text-editor', function (containerElement, options) {
+    var textarea, viewModeElement, writeModeElement, previewElement, selectionStart, selectionEnd;
+
+    this.render = function() {
+        writeModeElement = buildWriteMode();
+        viewModeElement = buildViewMode();
+
+        containerElement.appendChild(KB.el('div')
+            .attr('class', 'text-editor')
+            .add(viewModeElement)
+            .add(writeModeElement)
+            .build());
+    };
+
+    function buildViewMode() {
+        var toolbarElement = KB.el('div')
+            .attr('class', 'text-editor-toolbar')
+            .for('a', [
+                {href: '#', html: '<i class="fa fa-pencil-square-o fa-fw"></i> ' + options.labelWrite, click: function() { toggleViewMode(); }}
+            ])
+            .build();
+
+        previewElement = KB.el('div')
+            .attr('class', 'text-editor-preview-area markdown')
+            .build();
+
+        return KB.el('div')
+            .attr('class', 'text-editor-view-mode')
+            .add(toolbarElement)
+            .add(previewElement)
+            .hide()
+            .build();
+    }
+
+    function buildWriteMode() {
+        var toolbarElement = KB.el('div')
+            .attr('class', 'text-editor-toolbar')
+            .for('a', [
+                {href: '#', html: '<i class="fa fa-eye fa-fw"></i> ' + options.labelPreview, click: function() { toggleViewMode(); }},
+                {href: '#', html: '<i class="fa fa-bold fa-fw"></i>', click: function() { insertEnclosedTag('**'); }},
+                {href: '#', html: '<i class="fa fa-italic fa-fw"></i>', click: function() { insertEnclosedTag('_'); }},
+                {href: '#', html: '<i class="fa fa-strikethrough fa-fw"></i>', click: function() { insertEnclosedTag('~~'); }},
+                {href: '#', html: '<i class="fa fa-quote-right fa-fw"></i>', click: function() { insertPrependTag('> '); }},
+                {href: '#', html: '<i class="fa fa-list-ul fa-fw"></i>', click: function() { insertPrependTag('* '); }},
+                {href: '#', html: '<i class="fa fa-code fa-fw"></i>', click: function() { insertBlockTag('```'); }}
+            ])
+            .build();
+
+        textarea = KB.el('textarea')
+            .attr('name', options.name)
+            .attr('tabindex', options.tabindex || '-1')
+            .attr('required', options.required || false)
+            .attr('autofocus', options.autofocus || null)
+            .attr('placeholder', options.placeholder || '')
+            .text(options.text)
+            .build();
+
+        return KB.el('div')
+            .attr('class', 'text-editor-write-mode')
+            .add(toolbarElement)
+            .add(textarea)
+            .build();
+    }
+
+    function toggleViewMode() {
+        KB.el(previewElement).html(marked(textarea.value, {sanitize: true}));
+        KB.el(viewModeElement).toggle();
+        KB.el(writeModeElement).toggle();
+    }
+
+    function getSelectedText() {
+        return textarea.value.substring(textarea.selectionStart, textarea.selectionEnd);
+    }
+
+    function replaceTextRange(s, start, end, substitute) {
+        return s.substring(0, start) + substitute + s.substring(end);
+    }
+
+    function insertEnclosedTag(tag) {
+        var selectedText = getSelectedText();
 
-                this.id = uniqueId;
+        insertText(tag + selectedText + tag);
+        setCursorBeforeClosingTag(tag);
+    }
+
+    function insertBlockTag(tag) {
+        var selectedText = getSelectedText();
+
+        insertText('\n' + tag + '\n' + selectedText + '\n' + tag);
+        setCursorBeforeClosingTag(tag, 2);
+    }
+
+    function insertPrependTag(tag) {
+        var selectedText = getSelectedText();
+
+        if (selectedText.indexOf('\n') === -1) {
+            insertText('\n' + tag + selectedText);
+        } else {
+            var lines = selectedText.split('\n');
+
+            for (var i = 0; i < lines.length; i++) {
+                if (lines[i].indexOf(tag) === -1) {
+                    lines[i] = tag + lines[i];
+                }
             }
 
-            return this.id;
+            insertText(lines.join('\n'));
         }
-    },
-    methods: {
-        toggleEditor: function() {
-            this.preview = false;
-        },
-        togglePreview: function() {
-            this.preview = true;
-            this.renderedText = marked(this.text, {sanitize: true});
-        },
-        insertBoldTag: function() {
-            this.insertEnclosedTag('**');
-        },
-        insertItalicTag: function() {
-            this.insertEnclosedTag('_');
-        },
-        insertStrikethroughTag: function() {
-            this.insertEnclosedTag('~~');
-        },
-        insertQuoteTag: function() {
-            this.insertPrependTag('> ');
-        },
-        insertBulletListTag: function() {
-            this.insertPrependTag('* ');
-        },
-        insertCodeTag: function() {
-            this.insertBlockTag('```');
-        },
-        replaceTextRange: function(s, start, end, substitute) {
-            return s.substring(0, start) + substitute + s.substring(end);
-        },
-        getSelectedText: function() {
-            return this.text.substring(this.textarea.selectionStart, this.textarea.selectionEnd);
-        },
-        insertEnclosedTag: function(tag) {
-            var selectedText = this.getSelectedText();
-
-            this.insertText(tag + selectedText + tag);
-            this.setCursorBeforeClosingTag(tag);
-        },
-        insertPrependTag: function(tag) {
-            var selectedText = this.getSelectedText();
-
-            if (selectedText.indexOf('\n') === -1) {
-                this.insertText('\n' + tag + selectedText);
-            } else {
-                var lines = selectedText.split('\n');
-
-                for (var i = 0; i < lines.length; i++) {
-                    if (lines[i].indexOf(tag) === -1) {
-                        lines[i] = tag + lines[i];
-                    }
-                }
+    }
 
-                this.insertText(lines.join('\n'));
-            }
-        },
-        insertBlockTag: function(tag) {
-            var selectedText = this.getSelectedText();
-
-            this.insertText('\n' + tag + '\n' + selectedText + '\n' + tag);
-            this.setCursorBeforeClosingTag(tag, 2);
-        },
-        insertText: function(replacedText) {
-            var result = false;
-
-            this.selectionStart = this.textarea.selectionStart;
-            this.selectionEnd = this.textarea.selectionEnd;
-            this.textarea.focus();
-
-            if (document.queryCommandSupported('insertText')) {
-                result = document.execCommand('insertText', false, replacedText);
-            }
+    function insertText(replacedText) {
+        var result = false;
 
-            if (! result) {
-                try {
-                    document.execCommand("ms-beginUndoUnit");
-                } catch (error) {}
+        selectionStart = textarea.selectionStart;
+        selectionEnd = textarea.selectionEnd;
+        textarea.focus();
 
-                this.textarea.value = this.replaceTextRange(this.text, this.textarea.selectionStart, this.textarea.selectionEnd, replacedText);
+        if (document.queryCommandSupported('insertText')) {
+            result = document.execCommand('insertText', false, replacedText);
+        }
 
-                try {
-                    document.execCommand("ms-endUndoUnit");
-                } catch (error) {}
-            }
-        },
-        setCursorBeforeClosingTag: function(tag, offset) {
-            var position = this.selectionEnd + tag.length + offset;
-            this.textarea.setSelectionRange(position, position);
+        if (! result) {
+            try {
+                document.execCommand('ms-beginUndoUnit');
+            } catch (error) {}
+
+            textarea.value = replaceTextRange(text, textarea.selectionStart, textarea.selectionEnd, replacedText);
+
+            try {
+                document.execCommand('ms-endUndoUnit');
+            } catch (error) {}
         }
     }
+
+    function setCursorBeforeClosingTag(tag, offset) {
+        offset = offset || 0;
+        var position = selectionEnd + tag.length + offset;
+        textarea.setSelectionRange(position, position);
+    }
 });