Ajax-based formData image and data upload rue implementation

This time I will bring you the Ajax-based formData image and data upload rue implementation, Ajax-based formData image and data upload What are the precautions , the following is a practical case, let's take a look.

I recently worked on a project about user data and form uploading, and encountered a lot of pitfalls. I will share the summary here with you, 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 componentExplain that the project is based on the vue framework

<template>
  <p>    
    </p>
<p>
       </p>
<p>     
        <img  class="shopicon lazy" src="/static/imghwm/default1.png" data-src="../../assets/head.jpg" alt="Ajax-based formData image and data upload rue implementation" >
        </p>
<p>开心就好的小店</p>
      
    
    <p>
      </p>
<p>
        <label>商品名称：</label><input>
      </p>
      <p>
        <label>商品类型：</label>
        <select>
          <option>请选择</option>
          <option>图书</option>
          <option>卡券</option>
          <option>服装</option>
          <option>礼品</option>
          <option>运动装备</option>
          <option>电子设备</option>
          <option>日用百货</option>
          <option>其他</option>
        </select>
      </p>      
      <p>
        <label>商品描述</label>       
      </p> class="startleft">
       <textarea></textarea>
      <p>
        <label>单价:</label>
        <input>
      </p>
      <p>
        <label>数量:</label>
        <input>
      </p>
      <p>
        <label>联系电话:</label>
        <input>
      </p>
      <p>
        <label>地址:</label>
        <input>
      </p>
      <p>
        <label>图片</label>
        <img  class="goodsimg lazy" src="/static/imghwm/default1.png" data-src="../../assets/addimg.png" alt="Ajax-based formData image and data upload rue implementation" >
        <img  class="goodsimg lazy" src="/static/imghwm/default1.png" data-src="../../assets/addimg.png" alt="Ajax-based formData image and data upload rue implementation" >      
      </p>      
      <p>
        </p>
<p>
          <img  class="goodsimg lazy" src="/static/imghwm/default1.png" data-src="../../assets/addimg.png" alt="Ajax-based formData image and data upload rue implementation" >
          <input>
        </p>
        <p>
          <img  class="goodsimg lazy" src="/static/imghwm/default1.png" data-src="../../assets/addimg.png" alt="Ajax-based formData image and data upload rue implementation" >
          <input>
        </p> 
      
    
    <p>
      </p>
<ul>
        <li>首页</li>
        <li>返回货架</li>
        <li>放弃编辑</li>
        <li>上架</li>
      </ul>
    
    <p></p>
  
</template>

Instructions, including two components for uploading images, the first one has multiple for multi-file mode , that is, multiple pictures can be selected at one time, followed by 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 <p style="text-align: left;"><strong>Description: </strong></p><p style="text-align: left;">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 the parameter name received by the server, 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. </p><p style="text-align: left;">When the backend receives this type of file, the type is specified as: MultipartFile type </p><p style="text-align: left;"><strong>Special instructions: </strong></p><p style="text-align: left;"><span style="color: #800000">processData: false, <br>contentType: false, </span></p><p style="text-align: left;">These two sentences must be added, otherwise the data will be serialized and the backend cannot recognize it</p><p>I believe you have mastered it after reading the case in this article Method, for more exciting information, please pay attention to other related articles on the php Chinese website! </p><p>Recommended reading:</p><p><a href="http://www.php.cn/js-tutorial-391081.html" target="_blank">How to configure Google Chrome to support AJAX requests of the file protocol</a><br></p><p><a href="http://www.php.cn/js-tutorial-391075.html" target="_blank">How to use php to receive ajax submissions Data to the background</a><br></p>

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