[new feature] Uploader: support multiple files (#480)

docs/demos/views/uploader.vue

@@ -10,7 +10,7 @@
 
     <demo-block :title="$t('title2')">
       <div class="demo-uploader-container">
-        <van-uploader :after-read="logContent" accept="image/gif, image/jpeg">
+        <van-uploader :after-read="logContent" accept="image/gif, image/jpeg" multiple>
           <van-icon name="photograph" />
         </van-uploader>
       </div>

docs/markdown/en-US/uploader.md

@@ -30,10 +30,10 @@ export default {
 ```
 
 #### Set input attr
-You can set native properties such as `accpet` on Uploader, and the input will automatically inherits the attribute.
+You can set native properties such as `accpet`、`multiple` on Uploader, and the input will automatically inherits the attribute.
 
 ```html
-<van-uploader :afterRead="logContent" accept="image/gif, image/jpeg">
+<van-uploader :afterRead="logContent" accept="image/gif, image/jpeg" multiple>
   <van-icon name="photograph" />
 </van-uploader>
 ```

docs/markdown/zh-CN/uploader.md

@@ -28,10 +28,10 @@ export default {
 ```
 
 #### 设置 Input 属性
-可以直接在 Uploader 上设置 accpet 等原生属性，input 会自动继承该属性
+可以直接在 Uploader 上设置 accpet、multiple 等原生属性，input 会自动继承该属性
 
 ```html
-<van-uploader :afterRead="logContent" accept="image/gif, image/jpeg">
+<van-uploader :afterRead="logContent" accept="image/gif, image/jpeg" multiple>
   <van-icon name="photograph" />
 </van-uploader>
 ```

packages/uploader/index.vue

@@ -7,7 +7,7 @@
       class="van-uploader__input"
       v-bind="$attrs"
       :disabled="disabled"
-      @change="onValueChange"
+      @change="onChange"
     />
   </div>
 </template>
@@ -29,30 +29,52 @@ export default create({
   },
 
   methods: {
-    onValueChange(event) {
-      if (this.disabled) {
+    onChange(event) {
+      let { files } = event.target;
+      if (this.disabled || !files.length) {
         return;
       }
 
-      const file = event.target.files[0];
-      if (!file || (this.beforeRead && !this.beforeRead(file))) {
+      files = files.length === 1 ? files[0] : [].slice.call(files, 0);
+      if (!files || (this.beforeRead && !this.beforeRead(files))) {
         return;
       }
 
-      const reader = new FileReader();
-      reader.onload = (e) => {
-        this.afterRead && this.afterRead({
-          file,
-          content: e.target.result
+      if (Array.isArray(files)) {
+        Promise.all(files.map(this.readFile)).then(contents => {
+          this.onAfterRead(
+            files.map((file, index) => ({
+              file: files[index],
+              content: contents[index]
+            }))
+          );
+        });
+      } else {
+        this.readFile(files).then(content => {
+          this.onAfterRead({ file: files, content });
         });
-        this.$refs.input && (this.$refs.input.value = '');
-      };
-
-      if (this.resultType === 'dataUrl') {
-        reader.readAsDataURL(file);
-      } else if (this.resultType === 'text') {
-        reader.readAsText(file);
       }
+    },
+
+    readFile(file) {
+      return new Promise(resolve => {
+        const reader = new FileReader();
+
+        reader.onload = event => {
+          resolve(event.target.result);
+        };
+
+        if (this.resultType === 'dataUrl') {
+          reader.readAsDataURL(file);
+        } else if (this.resultType === 'text') {
+          reader.readAsText(file);
+        }
+      });
+    },
+
+    onAfterRead(file) {
+      this.afterRead && this.afterRead(file);
+      this.$refs.input && (this.$refs.input.value = '');
     }
   }
 });

test/unit/specs/uploader.spec.js

@@ -1,8 +1,10 @@
 import Uploader from 'packages/uploader';
 import { mount } from 'avoriaz';
+
 window.File = function() {
   this.name = 'test';
 };
+
 window.FileReader = function() {
   this.readAsDataURL = this.readAsText = function() {
     this.onload && this.onload({
@@ -12,97 +14,91 @@ window.FileReader = function() {
     });
   };
 };
+
+const mockFile = new File([], '/Users');
+
 describe('Uploader', () => {
   let wrapper;
   afterEach(() => {
     wrapper && wrapper.destroy();
   });
 
-  it('enabled', () => {
-    wrapper = mount(Uploader, {
-      propsData: {
-        disabled: false
-      }
-    });
-
-    expect(wrapper.contains('input')).to.equal(true);
-    expect(wrapper.vm.onValueChange({ target: { files: [] }})).to.equal(undefined);
-  });
-
   it('disabled', () => {
+    const afterRead = sinon.spy();
     wrapper = mount(Uploader, {
       propsData: {
-        disabled: true
+        disabled: true,
+        afterRead
       }
     });
 
     expect(wrapper.contains('input')).to.equal(true);
-    expect(wrapper.vm.onValueChange({ target: { files: [] }})).to.equal(undefined);
+    wrapper.vm.onChange({ target: { files: [] }});
+    expect(afterRead.calledOnce).to.be.false;
   });
 
   it('before read', () => {
+    const afterRead = sinon.spy();
     wrapper = mount(Uploader, {
       propsData: {
-        disabled: false,
-        beforeRead: () => {
-          return false;
-        }
+        beforeRead: () => false,
+        afterRead
       }
     });
 
-    expect(wrapper.contains('input')).to.equal(true);
-    expect(wrapper.vm.onValueChange({ target: { files: [new File([], '')] }})).to.equal(undefined);
+    wrapper.vm.onChange({ target: { files: [mockFile] }});
+    expect(afterRead.calledOnce).to.be.false;
   });
 
-  it('read text', () => {
+  it('read text', done => {
     wrapper = mount(Uploader, {
       propsData: {
-        disabled: false,
         resultType: 'text',
         afterRead: (file) => {
+          expect(file.content).to.equal('test');
+          done();
         }
       }
     });
 
-    expect(wrapper.contains('input')).to.equal(true);
-    expect(wrapper.vm.onValueChange({ target: { files: [new File([], '/Users')] }})).to.equal(undefined);
+    wrapper.vm.onChange({ target: { files: [mockFile] }});
   });
 
-  it('read text no after hook', () => {
+  it('read dataUrl', done => {
     wrapper = mount(Uploader, {
       propsData: {
-        disabled: false,
-        resultType: 'text'
-      }
-    });
-
-    expect(wrapper.contains('input')).to.equal(true);
-    expect(wrapper.vm.onValueChange({ target: { files: [new File([], '/Users')] }})).to.equal(undefined);
-  });
-
-  it('read dataUrl', () => {
-    wrapper = mount(Uploader, {
-      propsData: {
-        disabled: false,
-        resultType: 'dataUrl',
         afterRead: (file) => {
+          expect(file.content).to.equal('test');
+          done();
         }
       }
     });
 
-    expect(wrapper.contains('input')).to.equal(true);
-    expect(wrapper.vm.onValueChange({ target: { files: [new File([], '/Users')] }})).to.equal(undefined);
+    wrapper.vm.onChange({ target: { files: [mockFile] }});
   });
 
   it('unknown resultType', () => {
+    const afterRead = sinon.spy();
     wrapper = mount(Uploader, {
       propsData: {
-        disabled: false,
-        resultType: 'xxxx'
+        resultType: 'xxxx',
+        afterRead
+      }
+    });
+    wrapper.vm.onChange({ target: { files: [mockFile] }});
+    expect(afterRead.calledOnce).to.be.false;
+  });
+
+  it('read multiple files', done => {
+    wrapper = mount(Uploader, {
+      propsData: {
+        afterRead: (file) => {
+          expect(file.length).to.equal(2);
+          done();
+        }
       }
     });
 
-    expect(wrapper.contains('input')).to.equal(true);
-    expect(wrapper.vm.onValueChange({ target: { files: [new File([], '/Users')] }})).to.equal(undefined);
+    wrapper.vm.onChange({ target: { files: [mockFile, mockFile] }});
   });
 });