Analysis of the multi-image upload function example implemented by Laravel framework + Blob

This article mainly introduces the multi-image upload function implemented by Laravel framework Blob. It analyzes in detail the front-end submission and background processing related operation skills of Laravel framework Blob for multiple image upload operations in the form of examples. Friends in need can refer to the following

The example in this article describes the multi-image upload function implemented by Laravel framework Blob. Share it with everyone for your reference, the details are as follows:

1. Introduction

We know that multiple image uploads generally come with an instant display function , that is, you can see the uploaded image immediately after uploading. A multi-image upload plug-in that I have been using before is to select an image, click Upload and upload the image resources to the server, and then return the stored path information. Finally, we click the submit button of the form to insert this information into the database.

Now there is an embarrassing place. After I clicked to upload the image, I canceled the form submission again. However, the image resources have already been sent to the server, which can easily cause a waste of space.

Now we provide a multi-image upload written by ourselves combined with the Laravel framework (of course, it can be applied directly anywhere). The feature is: the image can be displayed immediately after uploading, but it is cached by the browser called through blob Image information, when the form is submitted, the image resources will actually be uploaded to the server and database.

2. Front-end

Note: This example is based on the Laravel framework

First enter the Form form

<form method="post" enctype="multipart/form-data" action="#">
  {{csrf_field()}}
  <ul class="list_btn">
  <li><img  class="sz lazy"  src="/static/imghwm/default1.png"  data-src=""   style="max-width:90%"imgone"   style="max-width:90%" height="100px"  style="display: none;" alt="Analysis of the multi-image upload function example implemented by Laravel framework + Blob" ></li>
   <li> <input type="file" id="house_img_one1" name="art_thumb" multiple="multiple" onchange="houseImgOne(this)"></li>
</ul>
  <p class="submit">上传</p>
</form>

JS code

<script>
  var _btnId = &#39;&#39;;
  var all_urls="";
  var all_types="";
  function houseImgOne(_this) {
    var img = &#39;<img  class="sz"    style="max-width:90%" height="100px" src=""   alt="Analysis of the multi-image upload function example implemented by Laravel framework + Blob" >&#39;
    _btnId = $(_this).attr(&#39;id&#39;);
    var obj = document.getElementById("house_img_one1");
    var length = obj.files.length;
    //多图上传时遍历文件信息（可以通过object.files查看）
    for (var i = 0; i < length; i++) {
      var objUrl = getObjectURL(_this.files[i]);
      //图片后缀类型拼接
      all_types=all_types+_this.files[i].type;
      //将图片转换成base64自字符
      var oFReader = new FileReader();
      oFReader.readAsDataURL(_this.files[i]);
      oFReader.onload = function (oFREvent) {
        all_urls=all_urls+oFREvent.target.result+"&|||"; //拼接data形式base64的url
      };
      if (objUrl) {
        $(&#39;.sz:last&#39;).before(img);
        $(&#39;.sz&#39;).eq($(".sz").length - 2).attr("src", objUrl);
      }
    }
  }
  //点击提交按钮触发ajax
    $(".submit").click(function(){
    //console.log(all_types);
    $.ajax({
      type:"post",
      url:"{{url(&#39;admin/img&#39;)}}",
      data:{&#39;imgs&#39;:all_urls,&#39;types&#39;:all_types,&#39;_token&#39;:"{{csrf_token()}}"},
      dataType:"json",
      success:function(data){
        if (data==1){
          // layer插件提示，可自行选择则
          layer.msg("上传成功", {icon: 6});
          window.location.reload();
        }else {
          alert("上传失败！");
        }
      }
    });
  });
  //获取blog对象url(实际获取的是缓存中的图片路径信息，用于即时显示，并非服务器返回的实际资源路径)
  function getObjectURL(file) {
    var url = null;
    if (window.createObjectURL != undefined) {
      url = window.createObjectURL(file);
    } else if (window.URL != undefined) {
      url = window.URL.createObjectURL(file);
    } else if (window.webkitURL != undefined) {
      url = window.webkitURL.createObjectURL(file);
    }
    return url;
  }
</script>

##3. Background processing code

public function store(Request $request)
{
  $data=$request->all();
  $imgs = $data['imgs'];
  // array_values()用于重置数组下标
  $types =array_values(array_filter(explode('image/',$data['types'])));
  $arr=array_values(array_filter(explode('&|||',$imgs)));
  foreach ($arr as $k => $v){
  //文件路径
  $filepath = base_path().'/storage/app/imgs/'.date('YmdHis').$k.'.'.$types[$k];
  //提取base64字符
  $imgdata = substr($v,strpos($v,",") + 1);
  $decodedData = base64_decode($imgdata);
  file_put_contents($filepath,$decodedData );
  //插入数据库
  $img = new Img;
  $filepath = strchr($filepath,'/');
  $img->img_path=$filepath;
  $img->save();
}

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