Vue + Element 自定义上传封面组件功能
作者:尚尚是高尚的尚
这篇文章主要介绍了Vue + Element 自定义上传封面组件,本文通过示例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下
前一段时间做项目,频繁使用到上传图片组件,而且只上传一个封面,于是想着自定义一个图片封面上传组件。先来看一下效果:
第一张图片是上传之前,第二张图片是上传成功后,第3张图片是鼠标放上去之后的效果!首先整理需求,图片上传我们使用照片墙的方式,只能上传一张图片,图片上传成功后不能继续上传,如果想要更换图片,则需要将图片删除后重新上传。点击图片上面的放大镜可以查看大图。需要限制图片上传的格式,图片的大小。组件代码:
<template> <div class="upload"> <el-upload :class="{'hidden':mFileList.length > 0}" list-type="picture-card" :on-remove="handleRemove" :action="action" :before-upload="beforeUploadHandle" :on-success="successHandle" :on-change="changeHandle" :limit="1" :accept="accept" :on-exceed="handleExceed" :file-list="fileList" :on-preview="handlePictureCardPreview" > <i class="el-icon-plus"></i> </el-upload> <el-dialog :visible.sync="dialogVisible"> <img width="100%" :src="dialogImageUrl" alt="" /> </el-dialog> </div> </template> <script> export default { props: { action: { type: String, default: "", }, accept: { type: String, default: "", }, fileList:{ type: Array, default: () => [], }, }, watch: { fileList(newValue, oldValue) { this.mFileList = newValue } }, data() { return { dialogVisible: false, //图片放大 fileImg: "", //上传图片 dialogImageUrl: "", //图片地址 mFileList:this.fileList, }; }, methods: { handleRemove(file, fileList) { this.$emit("upload-remove", file); }, handlePictureCardPreview(file) { this.dialogImageUrl = file.url; this.dialogVisible = true; }, // 上传之前 beforeUploadHandle(file) { if (file.type !== "image/jpeg" && file.type !== "image/png") { this.$message({ message: "只支持jpg、png格式的图片!", type: "warning", }); return false; } const isLt2M = file.size / 1024 / 1024 < 2; if (!isLt2M) { this.$message({ message: "上传文件大小不能超过 2MB!", type: "warning", }); return false; } }, // 上传成功 successHandle(response, file, fileList) { this.mFileList = fileList; if (response && response.code === 200) { this.$message.success("图片上传成功!"); this.$emit("upload-success", response, file); } else { this.$message.error(response.msg); } }, changeHandle(file, fileList) { if(file.response && file.response.code == 500) { this.$emit("upload-error",file); } }, handleExceed(files, fileList) { this.$message.warning("只能上传1张图片!"); }, }, }; </script> <style lang="scss"> .upload .hidden .el-upload--picture-card { display: none; } </style>
调用组件代码:
<template> <div> <el-form ref="dataForm" label-width="80px"> <el-form-item label="封面" prop="cover" class="is-required"> <upload list-type="picture-card" :action="url" :accept="'.jpg,.png,.JPG,.PNG'" :fileList="fileList" :limit="1" @upload-success="uploadFile" @upload-remove="removeFile" @upload-error="uploadError"> </upload> </el-form-item> </el-form> </div> </template> <script> import Upload from '../components/cover-upload/index.vue' export default { components: { Upload }, data() { return { url: "", fileList: [], } }, methods: { uploadUrl() { this.url = "http://xxx.xxx.xxx.xxx:xxx/yyxt/admin/course/courseInfo/upload?token=075de0303b15a38833a30a7a3b494794"//上传图片的后台接口 }, uploadError(file) { this.fileList = []; }, uploadFile(response, file) { this.fileList = [{ url: response.data, }, ]; }, removeFile(file) { this.fileList = []; }, }, mounted() { this.uploadUrl(); } } </script>
点击上传后的图片上的放大镜,显示图片大图
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