如何防止此多个拖放图像文件重复

时间:2016-08-27 18:24:15

标签: javascript jquery html css

我这里有3个div来自我的拖放图像文件,文件名是数组,我用类调用它然后我循环它。我的问题是当我尝试将图像文件放在特定的div中时,其中一个是div,它将图像复制到所有剩余的div中。我如何防止这种情况并允许我将图像仅放在我选择的div中?

这是我的代码https://jsfiddle.net/qm9nkco7/2/

HTML

<div class="sideBar_paddIT">
<input type="file" name="file_name[]" class="file_class" id="file_id0">
<div class="drag_here">
   <div class="drag_me" id="drag_me_id">
    <img class="img_here" src="" width="100%" >

    <center class="center_html">
      Click or Drag image here
    </center>

  </div>
 </div>
</div>

<div class="sideBar_paddIT">
<input type="file" name="file_name[]" class="file_class" id="file_id0">
<div class="drag_here">
<div class="drag_me" id="drag_me_id">
  <img class="img_here" src="" width="100%" >

  <center class="center_html">
    Click or Drag image here
  </center>

</div>
</div>
</div>

<div class="sideBar_paddIT">
<input type="file" name="file_name[]" class="file_class" id="file_id0">
<div class="drag_here">
<div class="drag_me" id="drag_me_id">
  <img class="img_here" src="" width="100%" >

  <center class="center_html">
    Click or Drag image here
  </center>

</div>
</div>
</div>

JS

$(document).on('click','.drag_me', function(){
    $('.file_class').trigger('click');
});


var imageLoader = document.getElementsByName('file_name[]');
for(var i= 0; i < imageLoader.length; i++){
    imageLoader[i].addEventListener('change', handleImage, false);
}


function handleImage(e) {
    e.stopPropagation();
    e.preventDefault();


    if(e.target.files.length === 0){
        return false;
    }
    var reader = new FileReader();
    reader.onload = function (event) {
        $('.drag_me .img_here').attr('src',event.target.result);
    }

    var taste_it = e.target.files[0];

    var file_name = taste_it.name;
    var file_size = taste_it.size;
    var file_type = taste_it.type;
    if(!check(file_type)){
        $('.trigger_danger_alert_changable').show().delay(5000).fadeOut();
        $('#palitan_ng_text').html('Invalid file format');
        return false;
    }
    if(file_size > 1500000){
        $('.trigger_danger_alert_changable').show().delay(5000).fadeOut();
        $('#palitan_ng_text').html('File size too large');
        $('.file_class').val(''); // <-- kaya d nag aalert dahil may laman,
        return false;
    }else{

             reader.readAsDataURL(e.target.files[0]);
                 $('.center_html').hide();
                 $('.image_name').html(file_name).css({'font-size' : '14px', 'color' : 'black'});

    }
 }

var obj = $('.drag_me');

obj.on('dragover', function(e){
    e.stopPropagation();
    e.preventDefault();
    $(this).css('border', '2px solid #39ADCD');

});



obj.on('drop', function(e){
   e.stopPropagation();
   e.preventDefault();
   $(this).css('border', '2px dotted #39ADCD');

   var files = e.originalEvent.dataTransfer.files;
   var file = files[0];

   var file_name = file.name;
   var file_size = file.size;
   var file_type = file.type;
if(!check(file_type)){
    $('.trigger_danger_alert_changable').show().delay(5000).fadeOut();
    $('#palitan_ng_text').html('Ivalid file format');
    return false;
}

if(file_size > 1500000){
    $('.trigger_danger_alert_changable').show().delay(5000).fadeOut();
    $('#palitan_ng_text').html('File size too large');
    return false;
}else{


            for(var i = 0; i<imageLoader.length; i++){
                imageLoader[i].files = files;
            }   
            $('.center_html').html(file_name).css({'font-size' : '14px', 'color' : 'black'});




}

});
function check(image){
    switch(image){
       case 'image/jpeg':
       return 1;
        case 'image/jpg':
       return 1;
       case 'image/png':
        return 1;
        case 'image/gif':
        return 1;
       default:
       return 0;
  }
 }

任何人都可以帮助我

1 个答案:

答案 0 :(得分:1)

  1. 不要将相同的id用于多个元素
  2. 不推荐使用<center>标记。请使用style="text-align: center;",最好是在课程中使用。
  3. 现在解决您的实际问题,该问题由两部分组成:

    $('.drag_me .img_here').attr('src', event.target.result);
    

    此行将event.target.result分配给每个src元素的.drag_me .img_here属性。

    $(document).on('click','.drag_me', function(){
        $('.file_class').trigger('click');
    });
    

    这会导致点击任意.drag_me元素,以触发每个.file_class元素的点击次数。

    这两个问题都可以通过不对不同的元素使用相同的id来解决,然后引用那些id来指定要定位的单个元素:

    HTML :注意id.drag_me元素的新.file_class

    <div class="sideBar_paddIT">
      <input type="file" name="file_name[]" class="file_class" id="file_id_0">
      <div class="drag_here">
        <div class="drag_me" id="drag_me_id_0">
          <img class="img_here" src="" width="100%">
    
          <center class="center_html">
            Click or Drag image here
          </center>
    
        </div>
      </div>
    </div>
    
    <div class="sideBar_paddIT">
      <input type="file" name="file_name[]" class="file_class" id="file_id_1">
      <div class="drag_here">
        <div class="drag_me" id="drag_me_id_1">
          <img class="img_here" src="" width="100%">
    
          <center class="center_html">
            Click or Drag image here
          </center>
    
        </div>
      </div>
    </div>
    
    <div class="sideBar_paddIT">
      <input type="file" name="file_name[]" class="file_class" id="file_id_2">
      <div class="drag_here">
        <div class="drag_me" id="drag_me_id_2">
          <img class="img_here" src="" width="100%">
    
          <center class="center_html">
            Click or Drag image here
          </center>
    
        </div>
      </div>
    </div>
    

    JavaScript :查看评论/**** ... ****/

    $(document).on('click', '.drag_me', function(ev) {
      /**** Get the specific element using the number in the id attribute ****/
      var idNum = $(this).attr('id').split('_')[3];
      $('.file_class').eq(idNum).trigger('click');
    });
    
    
    var imageLoader = document.getElementsByName('file_name[]');
    for (var i = 0; i < imageLoader.length; i++) {
      imageLoader[i].addEventListener('change', handleImage, false);
    }
    
    
    function handleImage(e) {
      e.stopPropagation();
      e.preventDefault();
    
      /**** Get the current input field by using the number in the id attribute ****/
      var currentInput = e.target.id.split('_')[2];
    
      if (e.target.files.length === 0) {
        return false;
      }
      var reader = new FileReader();
      reader.onload = function(event) {
        /**** Use the current input field instead of all the input fields ****/
        $('#drag_me_id_' + currentInput + ' .img_here').attr('src', event.target.result);
      }
    
      var taste_it = e.target.files[0];
    
      var file_name = taste_it.name;
      var file_size = taste_it.size;
      var file_type = taste_it.type;
      if (!check(file_type)) {
        $('.trigger_danger_alert_changable').show().delay(5000).fadeOut();
        $('#palitan_ng_text').html('Invalid file format');
        return false;
      }
      if (file_size > 1500000) {
        $('.trigger_danger_alert_changable').show().delay(5000).fadeOut();
        $('#palitan_ng_text').html('File size too large');
        $('.file_class').val(''); // <-- kaya d nag aalert dahil may laman,
        return false;
      } else {
    
        reader.readAsDataURL(e.target.files[0]);
        $('.center_html').hide();
        $('.image_name').html(file_name).css({
          'font-size': '14px',
          'color': 'black'
        });
    
      }
    }
    
    /** Rest of the code is unchanged **/
    

    See New Fiddle Here