javascript - 使用 jQuery 删除选定的文件

Question

尝试使用 jQuery 显示选定的图像并在单击图像时删除图像。

单击时删除图像工作正常，实际上问题是它没有从表单中删除。

$(document).ready(function() {
  /*multiple image preview first input*/

  $("#files").on("change", handleFileSelect);

  selDiv = $("#selectedFiles");
  $("#myForm").on("submit", handleForm);

  $("body").on("click", ".selFile", removeFile);

  /*end image preview */
});


var selDiv = "";
// var selDivM="";
var storedFiles = [];

function handleFileSelect(e) {

  var files = e.target.files;
  var filesArr = Array.prototype.slice.call(files);
  var device = $(e.target).data("device");
  filesArr.forEach(function(f) {

    if (!f.type.match("image.*")) {
      return;
    }
    storedFiles.push(f);

    var reader = new FileReader();
    reader.onload = function(e) {
      var html = "<div><img src=\"" + e.target.result + "\" data-file='" + f.name + "' class='selFile' title='Click to remove'>" + f.name + "<br clear=\"left\"/></div>";
      $("#selectedFiles").append(html);
    }
    reader.readAsDataURL(f);
  });

}

function handleForm(e) {
  e.preventDefault();
  var data = new FormData();

  for (var i = 0, len = storedFiles.length; i < len; i++) {
    data.append('files', storedFiles[i]);
  }

  var xhr = new XMLHttpRequest();
  xhr.open('POST', 'handler.cfm', true);

  xhr.onload = function(e) {
    if (this.status == 200) {
      console.log(e.currentTarget.responseText);
      alert(e.currentTarget.responseText + ' items uploaded.');
    }
  }

  xhr.send(data);
}

function removeFile(e) {
  var file = $(this).data("file");
  for (var i = 0; i < storedFiles.length; i++) {
    if (storedFiles[i].name === file) {
      storedFiles.splice(i, 1);
      break;
    }
  }
  $(this).parent().remove();
}

#selectedFiles img
{
  max-width: 200px;
  max-height: 200px;
  float: left;
  margin-bottom: 10px;
}
#userActions input {
  width: auto;
  margin: auto;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<form action="index.php" id="myForm" name="myForm" enctype="multipart/form-data" method="post" accept-charset="utf-8">
  desktop:
  <input type="file" id="files" name="files" multiple>
  <div id="selectedFiles"></div>
  <br/>
</form>

看到这个: https://jsfiddle.net/dvy10ms7/1/

看图片

Answer 1

这在下面的代码片段中得到修复。 jQuery 可以选择删除文件元素的值，就像我们在文本框中所做的一样，例如 $("#files").val("") 请检查。

$(document).ready(function() {
  /*multiple image preview first input*/

  $("#files").on("change", handleFileSelect);

  selDiv = $("#selectedFiles");
  $("#myForm").on("submit", handleForm);

  $("body").on("click", ".selFile", removeFile);

  /*end image preview */
});


var selDiv = "";
// var selDivM="";
var storedFiles = [];

function handleFileSelect(e) {

  var files = e.target.files;
  var filesArr = Array.prototype.slice.call(files);
  var device = $(e.target).data("device");
  filesArr.forEach(function(f) {

    if (!f.type.match("image.*")) {
      return;
    }
    storedFiles.push(f);

    var reader = new FileReader();
    reader.onload = function(e) {
      var html = "<div><img src=\"" + e.target.result + "\" data-file='" + f.name + "' class='selFile' title='Click to remove'>" + f.name + "<br clear=\"left\"/></div>";
      $("#selectedFiles").append(html);
    }
    reader.readAsDataURL(f);
  });

}

function handleForm(e) {
  e.preventDefault();
  var data = new FormData();

  for (var i = 0, len = storedFiles.length; i < len; i++) {
    data.append('files', storedFiles[i]);
  }

  var xhr = new XMLHttpRequest();
  xhr.open('POST', 'handler.cfm', true);

  xhr.onload = function(e) {
    if (this.status == 200) {
      console.log(e.currentTarget.responseText);
      alert(e.currentTarget.responseText + ' items uploaded.');
    }
  }

  xhr.send(data);
}

    
function removeFile(e) {
  var file = $(this).data("file");
  for (var i = 0; i < storedFiles.length; i++) {
    if (storedFiles[i].name === file) {
      storedFiles.splice(i, 1);
      break;
    }
  }
  $(this).parent().remove();
  $("#files").val("");
}

#selectedFiles img
{
  max-width: 200px;
  max-height: 200px;
  float: left;
  margin-bottom: 10px;
}
#userActions input {
  width: auto;
  margin: auto;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<form action="index.php" id="myForm" name="myForm" enctype="multipart/form-data" method="post" accept-charset="utf-8">
  desktop:
  <input type="file" id="files" name="files" multiple>
  <div id="selectedFiles"></div>
  <br/>
</form>