feat: 动态默认值

Author: dream2023

lib/EleForm.vue

@@ -101,7 +101,7 @@
 
 <script>
 import responsiveMixin from './mixins/responsiveMixin'
-import { isUnDef, is, castArray, getDeepVal, setDeepVal } from './tools/utils'
+import { isUnDef, is, castArray, getDeepVal, setDeepVal, isEmpty } from './tools/utils'
 import { throttle } from 'throttle-debounce'
 import localeMixin from 'element-ui/src/mixins/locale'
 import { t } from './locale'
@@ -573,12 +573,24 @@ export default {
               typeof disabled === 'function' ? disabled(formData) : disabled
             )
 
+            // 4.默认值
+            let defaultValue = typeof formItem.default === 'function' ? formItem.default(formData) : formItem.default
+            // 默认值不为空  & (值为空 || 老值和当前值)
+            if (!isEmpty(defaultValue) && (isEmpty(this.formData[field]) || formItem._defaultValue === this.formData[field])) {
+              // 判断是否有格式化函数
+              if (this.computedFormDesc[field].displayFormatter) {
+                defaultValue = this.desc.displayFormatter(defaultValue, this.formData)
+              }
+              setDeepVal(this.formData, field, defaultValue)
+            }
+
             const fullPath = field.split('.').join('.chidlren.')
             setDeepVal(this.formDesc, fullPath + '._type', type)
             setDeepVal(this.formDesc, fullPath + '._vif', vif)
             setDeepVal(this.formDesc, fullPath + '._disabled', disabled)
+            setDeepVal(this.formDesc, fullPath + '._defaultValue', defaultValue)
 
-            // 4.重新获取 options
+            // 5.重新获取 options
             if (formItem.isReloadOptions) {
               this.changeOptions(
                 getDeepVal(this.formDesc, fullPath),

lib/mixins/formMixin.js

@@ -1,6 +1,6 @@
 import ExtendSlot from '../ExtendSlot'
 import attrsMixin from './attrsMixin'
-import { is, isUnDef, isDef } from '../tools/utils'
+import { is, isDef } from '../tools/utils'
 import localMixin from './locale'
 import mock from '../tools/mock'
 
@@ -105,35 +105,6 @@ export default {
       }
     },
 
-    // 触发默认值
-    triggerDefault () {
-      const value = this.value
-      const isArr = Array.isArray(value)
-      // 值为空
-      if (
-        isUnDef(value) ||
-        value === '' ||
-        (isArr && value.length === 0)
-      ) {
-        // 默认值不为空
-        if (isDef(this.desc.default)) {
-          let defaultValue = this.desc.default
-          // 判断是否有格式化函数
-          if (this.desc.displayFormatter) {
-            defaultValue = this.desc.displayFormatter(defaultValue)
-          }
-
-          // 默认值类型检查
-          if (this.checkType && !this.checkType(defaultValue, true)) {
-            return
-          }
-
-          this.newValue = defaultValue
-          this.handleChange(this.newValue)
-        }
-      }
-    },
-
     // 初始化数据
     handleValueChanged (value) {
       if (this.desc.displayFormatter) {
@@ -147,8 +118,5 @@ export default {
         this.newValue = value
       }
     }
-  },
-  created () {
-    this.triggerDefault()
   }
 }

lib/tools/utils.js

@@ -137,10 +137,16 @@ export function castArray (value) {
   }
 }
 
-export default {
-  isDef,
-  isUnDef,
-  is,
-  isProd,
-  getSize
+// 判断是否为空
+// 空数组 / null / undefined / 空字符串
+export function isEmpty (val) {
+  if (Array.isArray(val) && val.length === 0) {
+    return true
+  } else if (isUnDef(val)) {
+    return true
+  } else if (typeof val === 'string' && val === '') {
+    return true
+  } else {
+    return false
+  }
 }