需求描述:需要将后台返回的图片路径赋值到img的 src
1 一个页面上传一张图片
当一个页面只有一个位置需要上传图片,很简单,直接绑定上传按钮
html页面
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< div class = "col-md-4" >
< input class = "hidden" accept = "image/png,image/jpg" type = "file" id = "tempUploadFile" v-on:change = "uploadPic($event)" />
< input class = "hidden" v-model = "mapItem.MapIcon" />
< img class = "imgbgbox" v-bind:src = "mapItem.MapIcon" />
</ div >
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js代码:封装上传图片的方法
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uploadPic(e) {
var _self = this ;
var inputFile = e.target;
if (!inputFile.files || inputFile.files.length <= 0) {
return ;
}
var file = inputFile.files[0];
var formData = new FormData();
formData.append( 'file' , file);
formData.append( 'SaveDir' , 'Map/MapItem' );
formData.append( "FileName" , $.whiskey.tools.dateFormat( new Date(), "HHmmssffff" ));
$.ajax({
url: "/Upload/UploadPic" , //后台上传图片的方法
type: 'POST' ,
dateType: 'json' ,
cache: false ,
data: formData,
processData: false ,
contentType: false ,
success: function (res) {
if (res.ResultType == 3) {
var filePath = res.Data.file; //后台返回的图片路径
_self.mapItem.MapIcon = filePath; //将路径赋值到声明的变量中
}
}
});
},
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2 一个页面上传多张图片
当一个页面有多个位置需要上传图片,如果按照上面方法,得需要绑定多个上传函数,所以我把重复的部分封装出来,用到了promise函数
html页面
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< div class = "col-md-4" >
< input class = "hidden" accept = "image/png,image/jpg" type = "file" id = "tempUploadFile" v-on:change = "uploadPic($event)" />
< input class = "hidden" v-model = "mapItem.MapIcon" />
< img class = "imgbgbox" v-bind:src = "mapItem.MapIcon" />
</ div >
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js代码:封装上传图片的方法
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uploadPic(e) {
var _self = this ;
var inputfile = e.target;
_self.uploadImg(inputfile).then(data => {
_self.mapItem.MapIcon = data; //data为取到的图片路径
})
},
//封装函数
uploadImg(inputFile) {
var _self = this ;
if (!inputFile.files || inputFile.files.length <= 0) {
return ;
}
return new Promise((suc,err)=>{
var file = inputFile.files[0];
var filepath = "" ;
var formData = new FormData();
formData.append( 'file' , file);
formData.append( 'SaveDir' , 'Map/MapSite' );
formData.append( "FileName" , $.whiskey.tools.dateFormat( new Date(), "HHmmssffff" ));
$.ajax({
url: "/Upload/UploadPic" ,
type: 'POST' ,
dateType: 'json' ,
cache: false ,
data: formData,
processData: false ,
async: false ,
contentType: false ,
success: function (res) {
if (res.ResultType == 3) {
filepath = res.Data.file;
suc(filepath);
}
}
});
})
},
},
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补充知识:vue 利用原生input上传图片并预览并删除
看代码~
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< template >
< div class = "com-upload-img" >
< div class = "img_group" >
< div v-if = "allowAddImg" class = "img_box" >
< input type = "file" accept = "image/*" multiple = "multiple" @ change = "changeImg($event)" >
< div class = "filter" />
</ div >
< div v-for = "(item,index) in imgArr" :key = "index" class = "img_box" >
< div class = "img_show_box" >
< img :src = "item" alt = "" >
< i class = "img_delete" @ click = "deleteImg(index)" />
<!-- <i class="img_delete" @click="imgArr.splice(index,1)"></i> -->
</ div >
</ div >
</ div >
</ div >
</ template >
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js部分
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<script>
export default {
name: 'ComUpLoad' ,
data() {
return {
imgData: '' ,
imgArr: [],
imgSrc: '' ,
allowAddImg: true
}
},
methods: {
changeImg: function (e) {
var _this = this
var imgLimit = 1024
var files = e.target.files
var image = new Image()
if (files.length > 0) {
var dd = 0
var timer = setInterval( function () {
if (files.item(dd).type !== 'image/png' && files.item(dd).type !== 'image/jpeg' && files.item(dd).type !== 'image/gif' ) {
return false
}
if (files.item(dd).size > imgLimit * 102400) {
// to do sth
} else {
image.src = window.URL.createObjectURL(files.item(dd))
image.onload = function () {
// 默认按比例压缩
var w = image.width
var h = image.height
var scale = w / h
w = 200
h = w / scale
// 默认图片质量为0.7,quality值越小,所绘制出的图像越模糊
var quality = 0.7
// 生成canvas
var canvas = document.createElement( 'canvas' )
var ctx = canvas.getContext( '2d' )
// 创建属性节点
var anw = document.createAttribute( 'width' )
anw.nodeValue = w
var anh = document.createAttribute( 'height' )
anh.nodeValue = h
canvas.setAttributeNode(anw)
canvas.setAttributeNode(anh)
ctx.drawImage(image, 0, 0, w, h)
var ext = image.src.substring(image.src.lastIndexOf( '.' ) + 1).toLowerCase() // 图片格式
var base64 = canvas.toDataURL( 'image/' + ext, quality)
// 回调函数返回base64的值
if (_this.imgArr.length <= 4) {
_this.imgArr.unshift( '' )
_this.imgArr.splice(0, 1, base64) // 替换数组数据的方法,此处不能使用:this.imgArr[index] = url;
if (_this.imgArr.length >= 5) {
_this.allowAddImg = false
}
}
}
}
if (dd < files.length - 1) {
dd++
} else {
clearInterval(timer)
}
}, 1000)
}
},
deleteImg: function (index) {
this .imgArr.splice(index, 1)
if ( this .imgArr.length < 5) {
this .allowAddImg = true
}
}
}
}
</script>
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以上这篇vue 使用原生组件上传图片的实例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/hhhhhhenrik/article/details/89708519