Add attachTo module

README.md

@@ -120,16 +120,19 @@ var vnode = h('div', {style: {color: '#000'}}, [
 
 ### Hooks
 
+
+#### Overview
+
 | Name      | Triggered when | Arguments to callback |
 | --------- | -------------- | --------------------- |
-| `pre`     | the patch process begins. | |
-| `create`  | a DOM element has been created based on a VNode. | `emptyVNode, createdVnode` |
-| `insert`  | an element has been inserted into the DOM. | `insertedVnode` |
-| `patch`   | an element is about to be patched. | `oldVnode, newVnode` |
-| `update`  | an element is being updated. | `oldVnode, newVnode` |
+| `pre`     | the patch process begins. | none |
+| `create`  | a DOM element has been created based on a VNode. | `emptyVNode, vnode` |
+| `insert`  | an element has been inserted into the DOM. | `vnode` |
+| `patch`   | an element is about to be patched. | `oldVnode, vnode` |
+| `update`  | an element is being updated. | `oldVnode, vnode` |
 | `remove`  | an element is directly being removed from the DOM. | `vnode, removeCallback` |
-| `destroy` | an element is begin removed from the DOM or it's parent is. | `vnode` |
-| `post`    | the patch process is done. | |
+| `destroy` | an element is being removed from the DOM or it's parent is. | `vnode` |
+| `post`    | the patch process is done. | none |
 
 ## Modules documentation
 

modules/attachto.js

@@ -0,0 +1,34 @@
+function insert(vnode) {
+  // Placeholder has been inserted, reset the vnodes
+  // element to the actual element so that updates will
+  // be made to the proper element
+  var attach = vnode.data.attachTo;
+  vnode.elm = attach.elm;
+}
+
+function attach(_, vnode) {
+  var data = vnode.data, target = data.attachTo;
+  if (target === undefined) return;
+  var elm = vnode.elm;
+  var placeholder = document.createElement('span');
+  // Replace actual element with dummy placeholder
+  // Snabbdom will then insert placeholder instead
+  vnode.elm = placeholder;
+  target.appendChild(elm);
+  if (vnode.data.hook === undefined) vnode.data.hook = {};
+  data.attachTo = {target: target, placeholder: placeholder, elm: elm};
+  var hook = vnode.data.hook;
+  hook.insert = insert;
+}
+
+function destroy(vnode) {
+  var attach = vnode.data.attachTo;
+  if (attach === undefined) return;
+  // Manually remove the actual element from where it was inserted
+  attach.target.removeChild(attach.elm);
+  // Replace actual element with the dummy
+  // placeholder so that Snabbdom removes it
+  vnode.elm = attach.placeholder;
+}
+
+module.exports = {create: attach, destroy: destroy};

snabbdom.js

@@ -79,7 +79,7 @@ function init(modules) {
     } else {
       elm = vnode.elm = document.createTextNode(vnode.text);
     }
-    return elm;
+    return vnode.elm;
   }
 
   function addVnodes(parentElm, before, vnodes, startIdx, endIdx) {
@@ -103,10 +103,10 @@ function init(modules) {
     for (; startIdx <= endIdx; ++startIdx) {
       var i, listeners, rm, ch = vnodes[startIdx];
       if (!isUndef(ch)) {
+        invokeDestroyHook(ch);
         listeners = cbs.remove.length + 1;
         rm = createRmCb(parentElm, ch.elm, listeners);
         for (i = 0; i < cbs.remove.length; ++i) cbs.remove[i](ch, rm);
-        invokeDestroyHook(ch);
         if (!isUndef(i = ch.data) && !isUndef(i = i.hook) && !isUndef(i = i.remove)) {
           i(ch, rm);
         } else {

test/attachto.js

@@ -0,0 +1,60 @@
+var assert = require('assert');
+var snabbdom = require('../snabbdom');
+
+var patch = snabbdom.init([
+  require('../modules/attachto'),
+]);
+var h = require('../h');
+
+describe('attachTo', function() {
+  var elm, vnode0;
+  beforeEach(function() {
+    elm = document.createElement('div');
+    vnode0 = elm;
+  });
+  it('adds element to target', function() {
+    patch(vnode0, h('div', [
+      h('div#wrapper', [
+        h('div', 'Some element'),
+        h('div#attached', {attachTo: elm}, 'Test'),
+      ]),
+    ]));
+    console.log(elm.children);
+    assert.equal(elm.children.length, 2);
+  });
+  it('updates element at target', function() {
+    var vnode1 = h('div', [
+      h('div#wrapper', [
+        h('div', 'Some element'),
+        h('div#attached', {attachTo: elm}, 'First text'),
+      ]),
+    ]);
+    var vnode2 = h('div', [
+      h('div#wrapper', [
+        h('div', 'Some element'),
+        h('div#attached', {attachTo: elm}, 'New text'),
+      ]),
+    ]);
+    patch(vnode0, vnode1);
+    assert.equal(elm.children[0].innerHTML, 'First text');
+    patch(vnode1, vnode2);
+    assert.equal(elm.children[0].innerHTML, 'New text');
+  });
+  it('removes element at target', function() {
+    var vnode1 = h('div', [
+      h('div#wrapper', [
+        h('div', 'Some element'),
+        h('div#attached', {attachTo: elm}, 'First text'),
+      ]),
+    ]);
+    var vnode2 = h('div', [
+      h('div#wrapper', [
+        h('div', 'Some element'),
+      ]),
+    ]);
+    patch(vnode0, vnode1);
+    assert.equal(elm.children[0].innerHTML, 'First text');
+    patch(vnode1, vnode2);
+    assert.equal(elm.children.length, 1);
+  });
+});

test/core.js

@@ -588,8 +588,8 @@ describe('snabbdom', function() {
       it('removes element when all remove listeners are done', function() {
         var rm1, rm2, rm3;
         var patch = snabbdom.init([
-            {remove: function(_, rm) { rm1 = rm; }},
-            {remove: function(_, rm) { rm2 = rm; }},
+          {remove: function(_, rm) { rm1 = rm; }},
+          {remove: function(_, rm) { rm2 = rm; }},
         ]);
         var vnode1 = h('div', [h('a', {hook: {remove: function(_, rm) { rm3 = rm; }}})]);
         patch(vnode0, vnode1);
@@ -608,14 +608,14 @@ describe('snabbdom', function() {
       it('invokes `pre` and `post` hook', function() {
         var result = [];
         var patch = snabbdom.init([
-            {pre: function() { result.push('pre'); }},
-            {post: function() { result.push('post'); }},
+          {pre: function() { result.push('pre'); }},
+          {post: function() { result.push('post'); }},
         ]);
         var vnode1 = h('div');
         patch(vnode0, vnode1);
         assert.deepEqual(result, ['pre', 'post']);
       });
-      it('invokes `destroy` hook for all removed children', function() {
+      it('invokes global `destroy` hook for all removed children', function() {
         var result = [];
         function cb(vnode) { result.push(vnode); }
         var vnode1 = h('div', [

test/index.js

@@ -1,3 +1,4 @@
 require('./core');
 require('./style');
+require('./attachto');
 require('./thunk');