DOM convenience methods

Author: yyx990803

src/compiler.js

@@ -7,7 +7,6 @@ var Emitter     = require('./emitter'),
     TextParser  = require('./text-parser'),
     DepsParser  = require('./deps-parser'),
     ExpParser   = require('./exp-parser'),
-    transition  = require('./transition'),
     // cache deps ob
     depsOb      = DepsParser.observer,
     // cache methods
@@ -618,10 +617,8 @@ CompilerProto.destroy = function () {
     // finally remove dom element
     if (el === document.body) {
         el.innerHTML = ''
-    } else if (el.parentNode) {
-        transition(el, -1, function () {
-            el.parentNode.removeChild(el)
-        }, this)
+    } else {
+        vm.$remove()
     }
 
     // post teardown hook

src/viewmodel.js

@@ -1,5 +1,6 @@
-var Compiler = require('./compiler'),
-    def      = require('./utils').defProtected
+var Compiler   = require('./compiler'),
+    def        = require('./utils').defProtected,
+    transition = require('./transition')
 
 /**
  *  ViewModel exposed to the user that holds data,
@@ -94,6 +95,56 @@ def(VMProto, '$emit', function () {
     })
 })
 
+// DOM convenience methods
+
+def(VMProto, '$appendTo', function (target) {
+    target = query(target)
+    var el = this.$el
+    transition(el, 1, function () {
+        target.appendChild(el)
+    }, this.$compiler)
+})
+
+def(VMProto, '$remove', function () {
+    var el = this.$el,
+        parent = el.parentNode
+    if (!parent) return
+    transition(el, -1, function () {
+        parent.removeChild(el)
+    }, this.$compiler)
+})
+
+def(VMProto, '$before', function (target) {
+    target = query(target)
+    var el = this.$el,
+        parent = target.parentNode
+    if (!parent) return
+    transition(el, 1, function () {
+        parent.insertBefore(el, target)
+    }, this.$compiler)
+})
+
+def(VMProto, '$after', function (target) {
+    target = query(target)
+    var el = this.$el,
+        parent = target.parentNode,
+        next = target.nextSibling
+    if (!parent) return
+    transition(el, 1, function () {
+        if (next) {
+            parent.insertBefore(el, next)
+        } else {
+            parent.appendChild(el)
+        }
+    }, this.$compiler)
+})
+
+function query (el) {
+    return typeof el === 'string'
+        ? document.querySelector(el)
+        : el
+}
+
 /**
  *  If a VM doesn't contain a path, go up the prototype chain
  *  to locate the ancestor that has it.

test/unit/specs/viewmodel.js

@@ -302,12 +302,9 @@ describe('UNIT: ViewModel', function () {
                     }
                 }
             },
-            el: {
-                getAttribute: function () {},
-                parentNode: {
-                    removeChild: function () {
-                        elRemoved = true
-                    }
+            vm: {
+                $remove: function () {
+                    elRemoved = true
                 }
             }
         }