feat(picker): add prop default-value

#255

components/picker/README.en-US.md

@@ -25,6 +25,7 @@ Vue.component(Picker.name, Picker)
 |data|data source|Array<{value, lable, ...}>[]|`[]`|-|
 |cols|number of columns|Number|`1`|-|
 |default-index|indexes of initially selected items in each column|Array|`[]`|-|
+|default-value|values of initially selected items in each column|Array|`[]`|Available key `text/lable/value`|
 |invalid-index|indexes of disabled items in each column|Array|`[]`|array of multiple disabled items, such as `[[1,2], 2]`|
 |is-view|inline display in page, otherwise it shows as `Popup`|Boolean|`false`|-|
 |is-cascade|data in each column is cascaded or not|Boolean|`false`|see #Appendix for the format of cascaded data|

components/picker/README.md

@@ -25,6 +25,7 @@ Vue.component(Picker.name, Picker)
 |data|数据源|Array<{value, lable, ...}>[]|`[]`|-|
 |cols|数据列数|Number|`1`|-|
 |default-index|选择器各列初始选中项索引|Array|`[]`|-|
+|default-value|选择器各列初始选中项值|Array|`[]`|可用字段`text/lable/value`|
 |invalid-index|选择器各列不可用选项索引|Array|`[]`|某列多个不可用项使用数组，单个使用数字, 如`[[1,2], 2]`|
 |is-view|是否内嵌在页面内展示，否则以弹层形式|Boolean|`false`|-|
 |is-cascade|各列数据是否级联|Boolean|`false`|级联数据格式见附录|

components/picker/cascade.js

@@ -5,6 +5,22 @@ const defaultOptions = {
   maxLevel: 0,
   values: [],
   defaultIndex: [],
+  defaultValue: [],
+}
+
+function getDefaultIndex(data, defaultIndex, defaultValue) {
+  let activeIndex = 0
+  if (defaultIndex !== undefined) {
+    return defaultIndex
+  } else if (defaultValue !== undefined) {
+    data.some((item, index) => {
+      if (item.text === defaultValue || item.label === defaultValue || item.value === defaultValue) {
+        activeIndex = index
+        return true
+      }
+    })
+  }
+  return activeIndex
 }
 
 /**
@@ -26,9 +42,9 @@ export default function(picker, options = {}, fn) {
 
   /* istanbul ignore next */
   for (let i = options.currentLevel + 1; i < options.maxLevel; i++) {
-    const activeIndex = options.defaultIndex[i] || 0
+    const columnValues = (!i ? values[i] : values.children) || []
-    const columnValues = values.children || []
     picker.setColumnValues(i, columnValues)
+    const activeIndex = getDefaultIndex(columnValues, options.defaultIndex[i], options.defaultValue[i])
     values = columnValues[activeIndex] || []
   }
 

components/picker/index.vue

@@ -88,14 +88,15 @@ export default {
     defaultIndex: {
       type: Array,
       default() {
-        if (this.cols < 1) {
+        // if (this.cols < 1) {
-          return []
+        //   return []
-        }
+        // }
-        const arr = new Array(this.cols)
+        // const arr = new Array(this.cols)
-        for (let i = 0, len = arr.length; i < len; i++) {
+        // for (let i = 0, len = arr.length; i < len; i++) {
-          arr[i] = 0
+        //   arr[i] = 0
-        }
+        // }
-        return arr
+        // return arr
+        return []
       },
     },
     invalidIndex: {
@@ -221,13 +222,15 @@ export default {
       }
 
       const defaultIndex = this.$_getDefaultIndex()
-      const defaultIndexOfFirstColumn = defaultIndex[0] || 0
+      const defaultValue = this.$_getDefaultValue()
+      // const defaultIndexOfFirstColumn = defaultIndex[0] || 0
       this.$nextTick(() => {
         cascadePicker(this.column, {
-          currentLevel: 0,
+          currentLevel: -1,
           maxLevel: this.cols,
-          values: this.data[0] ? this.data[0][defaultIndexOfFirstColumn] || [] : [],
+          values: this.data || [],
           defaultIndex,
+          defaultValue,
         })
       })
     },