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wepy-img-uploader

v0.1.4

Published

Image upload component for WePY applications

Downloads

3

Readme

WePY Image Uploader

简介

「WePY Image Uploader」是基于「WePY」小程序框架所开发的图片上传组件,其UI和交互如下图所示:

UI截图

  • 点击加号可选择图片进行上传;
  • 上传过程中,图片上方有黑色的半透明覆盖层,其宽度随着上传进度而变化,起到进度条的作用;
  • 上传过程中,不阻塞界面上的其他操作;
  • 点击已上传或上传中图片右上角的叉,可以移除图片(仅在页面数据中移除,非移除图片本身);
  • 点击小图可以查看大图。

(注意:本组件目前仅支持基于「WePY」开发的微信小程序项目)

安装

在小程序项目目录下安装本组件:

npm install wepy-img-uploader --save

属性说明

imgs

  • 说明:初始图片URL。
  • 必填:否。
  • 类型:字符串数组或对象数组。为对象数组时,每个对象应包含 img 和 thumb 两个属性,分别表示 原图URL 和 缩略图URL 。
  • 默认值:空数组。

count

  • 说明:最大图片数量。
  • 必填:否。
  • 类型:数字。
  • 默认值:1。

beforeUpload

  • 说明:上传前执行的函数,一般用于获取云存储的 token ,必须返回 Promise 。
  • 必填:否。
  • 类型:函数。
  • 默认值:无。

upload

  • 说明:执行上传的函数,必须返回 UploadTask 。
  • 必填:无。
  • 类型:函数,其参数依次为(参数较为复杂,请结合下文的示例查看):
    • 图片路径(本地临时路径);
    • beforeUpload返回的数据;
    • 用于解决上传Promise的resolve函数,上传成功后传入图片路径调用;
    • 用于拒绝上传Promise的reject函数,上传失败时传入错误对象调用。

事件说明

change

  • 说明:文件上传完成(无论成功与否)后触发。
  • 事件参数属性:
    • imgs:上传结果数组,数组中的字符串值即为已上传图片的URL,false值表示该图片还在上传中。

调用示例

<template lang="wxml">
	<view class="container">
		<uploader :count="imgCount" :imgs="imgs" :beforeUpload="beforeUpload" :upload="upload" @change.user="uploadChange"  />
	</view>
</template>

<style>
.container { margin-left: 45rpx; }
</style>

<script>
import wepy from 'wepy';
import WepyImgUploader from 'wepy-img-uploader';

export default class Test extends wepy.page {
	components = {
		uploader: WepyImgUploader
	}

	data = {
		// 初始图片
		imgs: [
			'https://qiniu-pic.ibeiliao.com/Ft7Zv-D_fGeNY3JiMDVxpCQ0yUFu',
			'https://qiniu-pic.ibeiliao.com/Fi3PDHm46m6rIEWa4RGSlwl_ffYp',
			'https://qiniu-pic.ibeiliao.com/Fif-BoZQwXNB14yQsuDu-4vugE-W',
			'https://qiniu-pic.ibeiliao.com/FiXPzJ94pFrEEETqKwUp4aciHxZl'
		].map((url) => {
			return {
				img: url,
				// 假设resizeImg为生成缩略图URL的函数
				thumb: resizeImg(url, 300)
			};
		}),

		// 记录上传结果
		uploadResult: null,

		// 最大图片数量
		imgCount: 8,

		// 上传前先获取token
		beforeUpload() {
			// 假设getToken为获取上传token的方法
			return getToken();
		},

		// 上传
		upload(path, token, resolve, reject) {
			return wx.uploadFile({
				// 此处省略其他参数
				success(res) {
					if (res.statusCode === 200) {
						// 上传成功后返回URL
						resolve(res.data.url);
					} else {
						reject(new Error(res.errMsg));
					}
				},
				fail(e) {
					reject(new Error(e.errMsg));
				}
			});
		}
	}

	methods = {
		// 每个文件上传成功都会触发change事件
		uploadChange(e) {
			this.uploadResult = e.imgs;
		}
	}

	onLoad() {
	}
}
</script>

注意事项

  • 使用不同的数据项记录初始图片和上传结果(例如示例中的 imgs 和 uploadResult 为两项数据),否则可能导致异常情况。
  • 通过判断上传结果数组中是否包含false值,即可得知图片是否全部上传完成。