ajax2.0之拖拽上传

index.html
<!DOCTYPE html>

<html>

  <head>

    <meta charset="utf-8">

    <title></title>

    <style media="screen">

    * {margin:0; padding:0; list-style: none}

    .box {width:400px; height:200px; background:#CCC; border:1px solid black; line-height:200px; position:absolute; left:50%; top:50%; margin-left:-200px; margin-top:-100px; text-align:center; display:none;}

    .img_list {overflow:hidden;}

    .img_list li {float:left; width:200px; height:200px; border:3px solid #666; margin:10px; position:relative;}

    .img_list li img {width:100%; height:100%;}

    .img_list li .del_btn {position:absolute; right:0; top:0;}

    </style>

    <script>

    window.onload=function (){

      let oUl=document.querySelector('.img_list');

      let oBox=document.querySelector('.box');

      let timer;

      document.addEventListener('dragover', (ev)=>{

        clearTimeout(timer);

        oBox.style.display='block';

        timer=setTimeout(function (){

          oBox.style.display='none';

        }, 300);

        ev.preventDefault();

      }, false);

      oBox.addEventListener('dragenter', ()=>{

        oBox.innerHTML='请松手';

      }, false);

      oBox.addEventListener('dragleave', ()=>{

        oBox.innerHTML='请把文件拖到这儿';

      }, false);

      oBox.addEventListener('drop', (ev)=>{

        Array.from(ev.dataTransfer.files).forEach(file=>{

          if(!file.type.startsWith('image/')){

            return;

          }

          let reader=new FileReader();

          reader.onload=function (){

            let oLi=document.createElement('li');

            oLi.file=file;

            oLi.innerHTML='<img src="a.png" alt=""><a href="javascript:;" class="del_btn">删除</a>';

            let oImg=oLi.children[0];

            oImg.src=this.result;

            let oBtnDel=oLi.children[1];

            oBtnDel.onclick=function (){

              oUl.removeChild(oLi);

            };

            oUl.appendChild(oLi);

          };

          reader.readAsDataURL(file);

        });

        ev.preventDefault();

      }, false);

      //真的上传

      let oBtnUpload=document.querySelector('#btn_upload');

      oBtnUpload.onclick=function (){

        let data=new FormData();

        Array.from(oUl.children).forEach(li=>{

          data.append('f1', li.file);

        });

        //

        let oAjax=new XMLHttpRequest();

        //POST

        oAjax.open('POST', `http://localhost:8080/api`, true);

        oAjax.send(data);

        oAjax.onreadystatechange=function (){

          if(oAjax.readyState==4){

            if(oAjax.status>=200 && oAjax.status<300 || oAjax.status==304){

              alert('成功');

            }else{

              alert('失败');

            }

          }

        };

      };

    };

    </script>

  </head>

  <body>

    <ul class="img_list">

      <!--<li>

        <img src="a.png" alt="">

        <a href="javascript:;" class="del_btn">删除</a>

      </li>

      <li>

        <img src="b.png" alt="">

        <a href="javascript:;" class="del_btn">删除</a>

      </li>-->

    </ul>

    <input type="button" name="" value="上传" id="btn_upload">

    <div class="box">

      请把文件拖到这儿

    </div>

  </body>

</html>
巴特西

ajax2.0之拖拽上传

最新文章

热门文章
