Ajax formData image and data upload_AJAX related

This article mainly introduces the Ajax-based formData image and data upload related information in detail. It has certain reference value. Interested friends can refer to

I recently worked on a project about The project of user data and form upload has encountered many pitfalls. Here is a summary shared with everyone, hoping to help everyone. (Xiaobai, everyone is welcome to communicate more)

I won’t go into too much detail, just come to the code! !

1. Upload component
Explain that the project is based on vueframework

<template>
  <p class="newproduct">    
    <p class="topbox">
       <p class="shopbox">     
        <img  class="shopicon lazy"  src="/static/imghwm/default1.png"  data-src="../../assets/head.jpg"    alt="Ajax formData image and data upload_AJAX related" >
        <p class="shopname">开心就好的小店</p>
      </p>
    </p>
    <p class="goodsbox">
      <p class="startleft namebox">
        <label class="title">商品名称：</label><input class="noborder" v-model="goodsname" placeholder="请输入商品名称">
      </p>
      <p class="startleft goodstypebox">
        <label class="title">商品类型：</label>
        <select v-model="goodstype">
          <option value="请选择">请选择</option>
          <option value="图书">图书</option>
          <option value="卡券">卡券</option>
          <option value="服装">服装</option>
          <option value="礼品">礼品</option>
          <option value="运动装备">运动装备</option>
          <option value="电子设备">电子设备</option>
          <option value="日用百货">日用百货</option>
          <option value="其他">其他</option>
        </select>
      </p>      
      <p class="startleft describebox">
        <label class="title">商品描述</label>       
      </p class="startleft">
       <textarea class="describeinfo" v-model="goodsinfo"></textarea>
      <p class="startleft">
        <label class="title">单价:</label>
        <input class="noborder" placeholder="请输入单价" v-model="price">
      </p>
      <p class="startleft">
        <label class="title">数量:</label>
        <input class="noborder" placeholder="请输入数量" v-model="number">
      </p>
      <p class="startleft">
        <label class="title">联系电话:</label>
        <input class="noborder" placeholder="请输入手机号" v-model="phone">
      </p>
      <p class="startleft">
        <label class="title">地址:</label>
        <input class="noborder" placeholder="请输入地址" v-model="address">
      </p>
      <p class="startleft">
        <label class="title">图片</label>
        <img  class="goodsimg lazy"  src="/static/imghwm/default1.png"  data-src="../../assets/addimg.png"   alt="Ajax formData image and data upload_AJAX related" >
        <img  class="goodsimg lazy"  src="/static/imghwm/default1.png"  data-src="../../assets/addimg.png"   alt="Ajax formData image and data upload_AJAX related" >      
      </p>      
      <p >
        <p >
          <img  class="goodsimg lazy"  src="/static/imghwm/default1.png"  data-src="../../assets/addimg.png"    alt="Ajax formData image and data upload_AJAX related" >
          <input id="file" type="file" class="fileupload" accept="image/*" multiple capture="camera" @change="viewimg()"/>
        </p>

        <p class="imgbox">
          <img  class="goodsimg lazy"  src="/static/imghwm/default1.png"  data-src="../../assets/addimg.png"    alt="Ajax formData image and data upload_AJAX related" >
          <input type="file" class="fileupload" accept="image/*" capture="camera" @change="viewimg()"/>
        </p> 
      </p>
    </p>
    <p class="bottombox" :style="{&#39;top&#39;:(height-12) + &#39;px&#39;}">
      <ul class="bottommenu">
        <li class="item" @click="backHome()">首页</li>
        <li class="item" @click="backShop()">返回货架</li>
        <li class="item border">放弃编辑</li>
        <li class="item" @click="uploadtest()">上架</li>
      </ul>
    </p>
    <p class="fillbottom"></p>
  </p>
</template>

description, including two components for uploading images , the former one has multiple which is multi-file mode, that is, multiple pictures can be selected at one time, and the latter one is single-file mode.

2. Next is the preview of the picture

viewimg($event) {
  //获取当前的input标签
  var currentObj = event.currentTarget; 
  //找到要预览的图片img标签，亦可动态生成
  var img = currentObj.parentNode.children[0]; 
  setImagePreview(currentObj, img);
  function setImagePreview(docObj, imgObjPreview) {
    if (docObj.files && docObj.files[0]) {
      imgObjPreview.style.display = 'block';
      imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
    }
  }
}

The main function of this part is to display the selected picture. Of course, there are not multiple pictures here. Situation

3. Core part, image upload

/*采用formData形式上传图片和表单数据*/
upload: function() {
  var _self = this;
  var formData = new FormData();
  var inputs = $("input.fileupload");
  for (var i = 0; i < inputs.length; i++) {
    var file = inputs[i];
    if (inputs[i].files[0]) {
      formData.append("file", file.files[0], file.files[0].name);
    }
  }
  formData.append(&#39;barterCommodityname&#39;, _self.goodsname);
  formData.append(&#39;barterSellingprice&#39;, _self.price);
  formData.append(&#39;barterContactinformation&#39;, _self.phone);
  formData.append(&#39;barterCommodityquantity&#39;, _self.number);
  formData.append(&#39;barterCommodityaddress&#39;, _self.address);
  formData.append(&#39;barterDescriptioninform&#39;, _self.goodsinfo);
  formData.append(&#39;barterCategoryid&#39;, _self.goodstype);
  var _self = this;
  $.ajax({
    type: &#39;POST&#39;,
    url: &#39;http://10.145.0.05/goods/addGoods&#39;,
    dataType: "json",
    data: formData,
    processData: false,
    contentType: false,
    success: function(data) {
      console.log(data);
      if (data.code == 200) {
        console.log("success");
        // _self.$router.push(&#39;/&#39;);
      } else {
        alert(data.message);
      }
    }
  });
}

Instructions:

Similar to formData.append('barterCategoryid', _self .goodstype); is a form of key-value pairs to save data, and formData.append(“file”, file.files[0], file.files[0].name); The first parameter is received by the server Parameter name, the second parameter is the file object, and the third parameter is the file name, so that multiple files can be added to the server in the form of an array.

When the backend receives this type of file, the type is specified as: MultipartFile type

Special instructions:

processData: false ,
contentType: false,

These two sentences must be added, otherwise the data will be serialized and the backend cannot recognize it

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