MessageBox: add inputValue (#2909)

examples/docs/en-US/message-box.md

@@ -284,9 +284,10 @@ The corresponding methods are: `MessageBox`, `MessageBox.alert`, `MessageBox.con
 | cancelButtonClass | custom class name of cancel button | string | — | — |
 | confirmButtonClass | custom class name of confirm button | string | — | — |
 | closeOnClickModal | whether MessageBox can be closed by clicking the mask | boolean | — | true (false when called with alert) |
-| closeOnPressEscape | whether MessageBox can be closed by pressing the ESC | boolean | — | false |
+| closeOnPressEscape | whether MessageBox can be closed by pressing the ESC | boolean | — | true (false when called with alert) |
 | showInput | whether to show an input | boolean | — | false (true when called with prompt) |
 | inputPlaceholder | placeholder of input | string | — | — |
+| inputValue | initial value of input | string | — | — |
 | inputPattern | regexp for the input | regexp | — | — |
 | inputValidator | validation function for the input. Should returns a boolean or string. If a string is returned, it will be assigned to inputErrorMessage | function | — | — |
 | inputErrorMessage | error message when validation fails | string | — | Illegal input |

examples/docs/zh-CN/message-box.md

@@ -281,9 +281,10 @@ import { MessageBox } from 'element-ui';
 | cancelButtonClass | 取消按钮的自定义类名 | string | — | — |
 | confirmButtonClass | 确定按钮的自定义类名 | string | — | — |
 | closeOnClickModal | 是否可通过点击遮罩关闭 MessageBox | boolean | — | true（以 alert 方式调用时为 false） |
-| closeOnPressEscape | 是否可通过按下 ESC 键关闭 MessageBox | boolean | — | false |
+| closeOnPressEscape | 是否可通过按下 ESC 键关闭 MessageBox | boolean | — | true（以 alert 方式调用时为 false） |
 | showInput | 是否显示输入框 | boolean | — | false（以 prompt 方式调用时为 true）|
 | inputPlaceholder | 输入框的占位符 | string | — | — |
+| inputValue | 输入框的初始文本 | string | — | — |
 | inputPattern | 输入框的校验表达式 | regexp | — | — |
 | inputValidator | 输入框的校验函数。可以返回布尔值或字符串，若返回一个字符串, 则返回结果会被赋值给 inputErrorMessage | function | — | — |
 | inputErrorMessage | 校验未通过时的提示文本 | string | — | 输入的数据不合法! |

packages/message-box/src/main.js

@@ -7,6 +7,7 @@ const defaults = {
   modalFade: true,
   lockScroll: true,
   closeOnClickModal: true,
+  closeOnPressEscape: true,
   inputValue: null,
   inputPlaceholder: '',
   inputPattern: null,
@@ -75,6 +76,7 @@ const showNextMsg = () => {
   if (!instance) {
     initInstance();
   }
+  instance.action = '';
 
   if (!instance.value || instance.closeTimer) {
     if (msgQueue.length > 0) {

packages/message-box/src/main.vue

@@ -174,10 +174,15 @@
     },
 
     watch: {
-      inputValue(val) {
+      inputValue: {
+        immediate: true,
+        handler(val) {
+          this.$nextTick(_ => {
             if (this.$type === 'prompt' && val !== null) {
               this.validate();
             }
+          });
+        }
       },
 
       value(val) {