Fixes for text boxes with border box sizing, added styled example page

example/app.css

@@ -0,0 +1,69 @@
+*, *::before, *::after {
+  box-sizing: border-box;
+}
+
+body {
+background: #6441A5; /* fallback for old browsers */
+background: -webkit-linear-gradient(to left, #6441A5 , #2a0845); /* Chrome 10-25, Safari 5.1-6 */
+background: linear-gradient(to left, #6441A5 , #2a0845); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
+font-family: "Helvetica Neue", "Helvetica", "Arial", sans-serif;
+}
+
+.app {
+  background: rgba(255,255,255,0.02);
+  background-clip: padding-box;
+  border: 1px solid rgba(255,255,255,0.1);
+  border-radius: 6px;
+  color: #fff;
+  margin: 50px auto;
+  padding: 20px;
+  width: 800px;
+}
+
+h2 {
+  margin-top: 0;
+  text-shadow: 0 -1px 0 #1f0037;
+}
+
+.textbox {
+  transition: box-shadow 250ms ease;
+  border-radius: 3px;
+  border: 1px solid #2b094c;
+  box-shadow: inset 0 1px 2px rgba(0,0,0,0.5);
+  color: #666;
+  font-size: 18px;
+  height: 36px;
+  outline: none;
+  padding: 5px 10px;
+}
+.textbox:focus {
+  box-shadow: 0 0 16px 8px rgba(255,255,255,0.3);
+}
+
+.buttons {
+  margin-top: 20px;
+}
+
+.buttons button {
+  transition: all 250ms ease;
+  appearance: none;
+  background: #4f2593;
+  border: 1px solid #2b094c;
+  border-radius: 3px;
+  box-shadow: inset 0 1px 0 rgba(255,255,255,0.1), 0 1px 2px rgba(0,0,0,0.2);
+  color: #fff;
+  cursor: pointer;;
+  font-size: 12px;
+  font-weight: bold;
+  letter-spacing: 0.05em;
+  margin-right: 10px;
+  outline: none;
+  padding: 15px;
+  position: relative;
+  text-transform: uppercase;
+  text-shadow: 0 -1px 0 #1f0037;
+}
+.buttons button:hover {
+  background: #471f84;
+}
+.buttons button:active { top: 1px; }

example/index.js

@@ -0,0 +1,34 @@
+import Vue from "vue"
+import VueInputAutosize from "../"
+
+Vue.use(VueInputAutosize, { maxWidth: 500, minWidth: 20, comfortZone: 0 });
+
+Vue.config.debug = true
+
+new Vue({
+  el: "body",
+  replace: false,
+  data(){
+    return {
+      msg: "Hello World!"
+    }
+  },
+  methods: {
+    setNewText(){
+      this.msg = "This is some new text for you!";
+    },
+    clearText(){
+      this.msg = "";
+    }
+  },
+  template: `
+  <div class="app">
+    <h2>vue-input-autosize</h2>
+    <input type='text' :value="msg" v-input-autosize placeholder="Enter text" class="textbox" />
+    <div class="buttons">
+      <button @click="setNewText">Set New Text</button>
+      <button @click="clearText">Clear Text</button>
+    </div>
+  </div>
+  `
+});

index.js

@@ -19,27 +19,29 @@ exports.install = function (Vue, options) {
 
       this.mirror = document.createElement("span");
       this.mirror.classList.add("vue-input-autosize-mirror");
-      document.body.appendChild(this.mirror);
 
       this.el.addEventListener("input", this.check.bind(this, this.el), false);
       setTimeout(function () {
         var styles = window.getComputedStyle(_this.el, null);
         Object.assign(_this.mirror.style, {
           position: "absolute",
-          top: "-9999px",
+          top: "0",
-          left: "-9999px",
+          left: "0",
           width: "auto",
           whiteSpace: "nowrap",
+          border: styles.getPropertyValue("border"),
           fontSize: styles.getPropertyValue("font-size"),
           fontFamily: styles.getPropertyValue("font-family"),
           fontWeight: styles.getPropertyValue("font-weight"),
           letterSpacing: styles.getPropertyValue("letter-spacing"),
+          padding: styles.getPropertyValue("padding"),
           textTransform: styles.getPropertyValue("text-transform"),
-          ariaHidden: true
+          ariaHidden: true,
+          opacity: 0
         });
+        document.body.appendChild(_this.mirror);
         _this.check(_this.el);
       }, 0);
-      // this.vm.$watch()
     },
     update: function update(newVal, oldVal) {
       this.check(this.el);

index.umd.js

@@ -23,7 +23,6 @@
 
         this.mirror = document.createElement("span");
         this.mirror.classList.add("vue-input-autosize-mirror");
-        document.body.appendChild(this.mirror);
 
         this.el.addEventListener("input", this.check.bind(this, this.el), false);
         setTimeout(function () {
@@ -39,11 +38,12 @@
             fontWeight: styles.getPropertyValue("font-weight"),
             letterSpacing: styles.getPropertyValue("letter-spacing"),
             textTransform: styles.getPropertyValue("text-transform"),
-            ariaHidden: true
+            ariaHidden: true,
+            opacity: 0
           });
+          document.body.appendChild(_this.mirror);
           _this.check(_this.el);
         }, 0);
-        // this.vm.$watch()
       },
       update: function update(newVal, oldVal) {
         this.check(this.el);

package.json

@@ -16,8 +16,8 @@
     "build:all": "npm run build && npm run build:umd",
     "build": "BUILD_ENV=cjs rollup -c",
     "build:umd": "BUILD_ENV=umd rollup -c",
-    "example": "vbuild --dev -e example",
+    "example": "vbuild --dev",
-    "example:build": "vbuild -e example -t VueInputAutosize",
+    "example:build": "vbuild -t VueInputAutosize",
     "test": "karma start karma.conf.js --single-run true --auto-watch false",
     "watch-test": "karma start karma.conf.js --single-run false --auto-watch true"
   },

src/index.js

@@ -17,27 +17,30 @@ exports.install = function(Vue, options){
 
       this.mirror = document.createElement("span");
       this.mirror.classList.add("vue-input-autosize-mirror");
-      document.body.appendChild(this.mirror);
+
 
       this.el.addEventListener("input", this.check.bind(this, this.el), false);
       setTimeout(() => {
         let styles = window.getComputedStyle(this.el, null);
         Object.assign(this.mirror.style, {
           position: "absolute",
-          top: "-9999px",
+          top: "0",
-          left: "-9999px",
+          left: "0",
           width: "auto",
           whiteSpace: "nowrap",
+          border: styles.getPropertyValue("border"),
           fontSize: styles.getPropertyValue("font-size"),
           fontFamily: styles.getPropertyValue("font-family"),
           fontWeight: styles.getPropertyValue("font-weight"),
           letterSpacing: styles.getPropertyValue("letter-spacing"),
+          padding: styles.getPropertyValue("padding"),
           textTransform: styles.getPropertyValue("text-transform"),
-          ariaHidden: true
+          ariaHidden: true,
+          opacity: 0
         });
+        document.body.appendChild(this.mirror);
         this.check(this.el);
       }, 0);
-      // this.vm.$watch()
     },
     update(newVal, oldVal){
       this.check(this.el);

vbuild.js

@@ -0,0 +1,6 @@
+export default {
+  entry: {
+    js: './example',
+    css: './example/app.css'
+  }
+}