Javascript 如何在vue.js 2上使用ajax上传图像?
我的组件vue如下所示:Javascript 如何在vue.js 2上使用ajax上传图像?,javascript,ajax,vue.js,vuejs2,vue-component,Javascript,Ajax,Vue.js,Vuejs2,Vue Component,我的组件vue如下所示: <template> <div class="modal" tabindex="-1" role="dialog"> <div class="modal-dialog" role="document"> <div class="modal-content"> <form method="post" :action="baseUrl+'/p
<template>
<div class="modal" tabindex="-1" role="dialog">
<div class="modal-dialog" role="document">
<div class="modal-content">
<form method="post" :action="baseUrl+'/product/editImage'" enctype="multipart/form-data">
...
<input type="file" v-on:change="changeImage" name="image" id="image" required>
...
</form>
</div>
</div>
</div>
</template>
<script>
export default{
...
methods: {
changeImage(e) {
data = new FormData();
data.append('file', $('#image')[0].files[0]);
var imgname = $('#image').val();
var size = $('#image')[0].files[0].size;
var ext = imgname.substr( (imgname.lastIndexOf('.') +1) );
if(ext=='jpg' || ext=='jpeg' || ext=='png' || ext=='gif' || ext=='PNG' || ext=='JPG' || ext=='JPEG') {
if(size<=5000000) {
$.ajax({
url: window.Laravel.baseUrl+'/product/addImage',
type: "POST",
data: data,
enctype: 'multipart/form-data',
processData: false, // tell jQuery not to process the data
contentType: false // tell jQuery not to set contentType
}).done(function(data) {
if (!$.trim(data)) {
alert('No response');
}
else {
var files = e.target.files || e.dataTransfer.files
if (!files.length)
return;
this.createImage(files[0])
this.imageChanged = files[0]
$('#image').val(data);
}
});
return false;
}
else {
alert('Sorry File size exceeding from 5 Mb');
$('#image').val('');
}
}
else {
alert('Sorry Only you can uplaod JPEG|JPG|PNG|GIF file type ');
}
},
createImage(file) {
var image = new Image()
var reader = new FileReader()
var vm = this
reader.onload = (e) => {
vm.image = e.target.result
};
reader.readAsDataURL(file)
},
}
}
</script>
...
...
导出默认值{
...
方法:{
更改图像(e){
数据=新表单数据();
data.append('file',$('#image')[0].files[0]);
var imgname=$('#image').val();
var size=$('#image')[0]。文件[0]。大小;
var ext=imgname.substr((imgname.lastIndexOf('.')+1));
如果(ext=='jpg'| | ext=='jpeg'| | ext=='png'| | ext=='gif'| | ext=='png'| | ext=='jpg'| | ext=='jpeg'){
如果(尺寸){
vm.image=e.target.result
};
reader.readAsDataURL(文件)
},
}
}
我仍然在vue.js 2中使用javascript。因为我仍然对整个vue.js感到困惑
上传图片时,出现如下错误:
<template>
<div class="modal" tabindex="-1" role="dialog">
<div class="modal-dialog" role="document">
<div class="modal-content">
<form method="post" :action="baseUrl+'/product/editImage'" enctype="multipart/form-data">
...
<input type="file" v-on:change="changeImage" name="image" id="image" required>
...
</form>
</div>
</div>
</div>
</template>
<script>
export default{
...
methods: {
changeImage(e) {
data = new FormData();
data.append('file', $('#image')[0].files[0]);
var imgname = $('#image').val();
var size = $('#image')[0].files[0].size;
var ext = imgname.substr( (imgname.lastIndexOf('.') +1) );
if(ext=='jpg' || ext=='jpeg' || ext=='png' || ext=='gif' || ext=='PNG' || ext=='JPG' || ext=='JPEG') {
if(size<=5000000) {
$.ajax({
url: window.Laravel.baseUrl+'/product/addImage',
type: "POST",
data: data,
enctype: 'multipart/form-data',
processData: false, // tell jQuery not to process the data
contentType: false // tell jQuery not to set contentType
}).done(function(data) {
if (!$.trim(data)) {
alert('No response');
}
else {
var files = e.target.files || e.dataTransfer.files
if (!files.length)
return;
this.createImage(files[0])
this.imageChanged = files[0]
$('#image').val(data);
}
});
return false;
}
else {
alert('Sorry File size exceeding from 5 Mb');
$('#image').val('');
}
}
else {
alert('Sorry Only you can uplaod JPEG|JPG|PNG|GIF file type ');
}
},
createImage(file) {
var image = new Image()
var reader = new FileReader()
var vm = this
reader.onload = (e) => {
vm.image = e.target.result
};
reader.readAsDataURL(file)
},
}
}
</script>
未捕获引用错误:未定义数据
似乎data=new FormData();不在vue.js上工作
我试过使用javascript,效果很好
但是当我将它实现到vue.js时,它就不起作用了
如何解决这个问题?为了更好地利用Vue,我对您的代码进行了一些修改。除了ajax提交之外,不再使用jQuery
new Vue({
el:"#app",
data:{
allowableTypes: ['jpg', 'jpeg', 'png', 'gif'],
maximumSize: 5000000,
selectedImage: null,
image: null,
options:{
url: 'https://httpbin.org/post',
type: "POST",
processData: false,
contentType: false
}
},
methods: {
validate(image) {
if (!this.allowableTypes.includes(image.name.split(".").pop().toLowerCase())) {
alert(`Sorry you can only upload ${this.allowableTypes.join("|").toUpperCase()} files.`)
return false
}
if (image.size > this.maximumSize){
alert("Sorry File size exceeding from 5 Mb")
return false
}
return true
},
onImageError(err){
console.log(err, 'do something with error')
},
changeImage($event) {
this.selectedImage = $event.target.files[0]
//validate the image
if (!this.validate(this.selectedImage))
return
// create a form
const form = new FormData();
form.append('file', this.selectedImage);
// submit the image
$.ajax(Object.assign({}, this.options, {data: form}))
.then(this.createImage)
.catch(this.onImageError);
},
createImage() {
const image = new Image()
const reader = new FileReader()
reader.onload = (e) => {
this.image = e.target.result
};
reader.readAsDataURL(this.selectedImage)
},
}
})
模板
<div id="app">
<input type="file" v-on:change="changeImage" name="image">
<input v-if="selectedImage" v-model="selectedImage.name" type="hidden" name="photo" />
{{image}}
</div>
{{image}
.可能适合您:其文件上载功能可用: HTML
实际上,我是为自己创建的,但后来我决定在Github中发布它。我希望您会对此感兴趣。1.“似乎data=new FormData();不使用vue.js”不应该是原因。@J Jin,那么解决方案是什么呢?在“data=new FormData()”中,您在哪里定义“data”或可以使用“var data=new FormData()”在.done(function(data)’中,除了'data'之外,你可以使用其他名称吗@J Jin,现在它可以工作了。我这样使用:
let myForm=document.getElementById('myForm');let data=new FormData(myForm);
你能更新const onDone吗?我这样更新它:const onDone=(data)=>{if(!$.trim(data)){alert('No response');}如果(!files.length)返回,则{var files=$event.target.files | |$event.dataTransfer.files;this.createImage(files[0])this.imageChanged=files[0]$(“#图像_已更改”).val(数据);}
我曾经显示图像。我尝试这样做,但存在错误:未捕获的DomeException:未能设置“HTMLInputElement”的“value”属性:此输入元素接受一个文件名,该文件名只能通过编程设置为空字符串。
@TrendingNews是\image\u changed
一个img
元素?对不起,我是指n$('#image').val(数据);
@TrendingNews不允许为文件输入元素设置值。
Vue.ajax.post('http://example.com', [data], {
fileInputs: [
document.getElementById('my-input')
]
});