From 5f9c6eeb0f3fb372503cd468b2a39acd9fd2a503 Mon Sep 17 00:00:00 2001
From: Frost-ZX <30585462+Frost-ZX@users.noreply.github.com>
Date: Fri, 18 Mar 2022 11:06:49 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=96=87=E4=BB=B6=E9=80=89?=
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---
 src/components/FileUpload.vue | 190 ++++++++++++++++++++++++++++++++++
 1 file changed, 190 insertions(+)
 create mode 100644 src/components/FileUpload.vue

diff --git a/src/components/FileUpload.vue b/src/components/FileUpload.vue
new file mode 100644
index 0000000..78910be
--- /dev/null
+++ b/src/components/FileUpload.vue
@@ -0,0 +1,190 @@
+<docs>
+
+## $emit
+
+### @changed
+
+```javascript
+{
+  count: Number,
+  min: Number,
+  max: Number,
+  multiple: Boolean,
+  list: FileList,
+}
+```
+
+### @exceeded
+
+```javascript
+{
+  count: Number,
+  min: Number,
+  max: Number,
+}
+```
+
+</docs>
+
+<template>
+  <div class="file-upload" @click="selectFile()">
+    <slot />
+    <input
+      ref="inputFile"
+      class="input-file"
+      type="file"
+      :accept="accept == '' ? false : accept"
+      :capture="capture == '' ? false : capture"
+      :multiple="multiple"
+      :name="name == '' ? false : name"
+      @change="fileChanged()"
+      @click.stop
+    />
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'FileUpload',
+  props: {
+
+    /**
+     * 接受的文件类型  
+     * 格式与 input 标签的 accept 属性相同
+     */
+    accept: {
+      type: String,
+      default: ''
+    },
+
+    /** 格式与 input 标签的 capture 属性相同 */
+    capture: {
+      type: String,
+      default: '',
+    },
+
+    /** 是否禁用 */
+    disabled: {
+      type: Boolean,
+      default: false
+    },
+
+    /** 最大文件数量 */
+    filesMax: {
+      type: Number,
+      default: 0,
+    },
+
+    /** 最小文件数量 */
+    filesMin: {
+      type: Number,
+      default: 0,
+    },
+
+    /** 是否为多选 */
+    multiple: {
+      type: Boolean,
+      default: false,
+    },
+
+    /** 为 input 设置 name */
+    name: {
+      type: String,
+      default: '',
+    },
+
+  },
+  data() {
+    return {
+      logPrefix: '[文件上传]',
+    };
+  },
+  methods: {
+
+    /** 选择了新的文件 */
+    fileChanged() {
+
+      /** @type {HTMLInputElement} */
+      const el = this.$refs['inputFile'];
+
+      /** @type {FileList} */
+      var files = null;
+      var count = 0;
+
+      const max = this.filesMin;
+      const min = this.filesMax;
+
+      if (el) {
+        files = el.files;
+        count = files.length;
+      } else {
+        console.error(this.logPrefix, 'input 元素不存在');
+        return;
+      }
+
+      if (count == 0) {
+        console.warn(this.logPrefix, '未选择文件');
+        return;
+      }
+
+      if (this.multiple && min != 0 && max != 0) {
+        if (max < min) {
+          console.error(this.logPrefix, '文件数量限制设置错误');
+          return;
+        }
+        if (count < min || count > max) {
+          // 触发父组件 @exceeded
+          this.$emit('exceeded', { count, min, max });
+          return;
+        }
+      }
+
+      // 触发父组件 @changed
+      this.$emit('changed', {
+        count,
+        min,
+        max,
+        multiple: this.multiple,
+        list: files,
+      });
+
+    },
+
+    /** 选择文件 */
+    selectFile() {
+
+      if (this.disabled) {
+        return;
+      }
+
+      /** @type {HTMLInputElement} */
+      const el = this.$refs['inputFile'];
+
+      if (el) {
+        el.value = '';
+        el.click();
+      } else {
+        console.error(this.logPrefix, 'input 元素不存在');
+      }
+
+    },
+
+  },
+}
+</script>
+
+<style lang="less" scoped>
+.file-upload {
+  display: inline-block;
+  position: relative;
+}
+
+.input-file {
+  visibility: hidden;
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+}
+</style>