javascript - 允许html2canvas显示图片和下载图片

Question

在过去的 3 天里，我一直在努力寻找这个问题的答案，但似乎找不到我的问题的答案。我的代码很长请见谅。我的代码很长的原因是因为我必须考虑所有变量我问了同样的问题并遗漏了一些代码当我尝试将它集成到我的页面时它没有工作。我想要的是我的狗图像当我下载它时显示在我的衬衫图像中，但现在我得到一个空白下载。这是一个实时代码 http://torcdesign.com/evol/

function fctCheck(gender) {
  var elems = document.getElementsByName("subselector");
  for (var i = 0; i < elems.length; i++) {
    elems.item(i).style.display = "none";
  }
  document.getElementById(gender).style.display = "block";
}
$('#men').on('change', function() {
  $("#mtsm").css('display', (this.value == 'tsm') ? 'block' : 'none');
});



$(document).ready(function() {
  $('.colore.active').each(function() {
    $('.container ').css('background-image', 'url(' + $(this).data("image") + ')');
  });
  $('.colore').on('click', function() {
    $('.container').css('src', '');
    $('.container ').css('background-image', 'url(' + $(this).data("image") + ')');
    $('.container7').css('background-image', 'url(' + $(this).data("image-back") + ')');
  });
  $('#toggler').click(function() {
    var tmp = $('.container').css('background-image');
    $('.container').css('background-image', $('.container7').css('background-image'));

    $('.container7').css('background-image', tmp);
  });
});localStorage.option1 = "wow cool option text here"
$(document).ready(function() {
  $('#imajes').change(function() {
    $('.subselector').hide();
    $('.smallimages').hide();
    $('#' + $(this).val()).show();
	
  });
  
    $('.smallimages').hide();
    var id = $(this).attr('id');
    var val = $(this).val();
	
	
$('#dog').on('change', function() {
  
  $("#bulldogimges").css('display', (this.value == 'bulldog') ? 'block' : 'none');



});

$('img').on('click', function() {
    $('#fotos').append('<div class="imgdrag"><img class="modal-content" src="' + $(this).attr('src')+ '"/></div>'); $('.imgdrag').draggable();
$('#fotos').droppable();
	           $('.modal-content').resizable();


$(".download").attr("href",$(this).attr('src'));
  $(".download").show();
});

  
  
});





var download = document.getElementById("download"),
		result = document.getElementById("previewImage");

function renderContent() {
    html2canvas(document.getElementById("firstshirt"), {
        allowTaint: true
    }).then(function(canvas) {
    		result.appendChild(canvas);
        download.style.display = "inline"; download.href = result.children[0].toDataURL();
    });
}

function downloadImage() {
		
}

document.getElementById("btn-Preview-Image").onclick = renderContent;
download.onclick = downloadImage

.container {background-color: transparent;
    width: 490px;
    height: 500px;
    border: 2px solid;
    position: relative;
overflow: hidden;

/* Will stretch to specified width/height */
  background-size: 490px 500px;
  background-repeat: no-repeat;

}.colore {
  float: left;
  width: 20px;
  height: 20px;
  margin: 5px;
  border: 1px solid rgba(0, 0, 0, .2);
}
.white {
  background: #FFFFFF;
}.black {
  background: #000000;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.1/knockout-min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript" 
	src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.js"></script>

<script src="https://rawgit.com/niklasvh/html2canvas/master/dist/html2canvas.min.js"></script>
<script src="https://hongru.github.io/proj/canvas2image/canvas2image.js"></script>

<script  
 src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script><script src="//cdnjs.cloudflare.com/ajax/libs/knockout/2.3.0/knockout-min.js"></script>
 <link rel="stylesheet"
href="https://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" />
  <script src="https://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
  <link rel="stylesheet"
 href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
 <script src="https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.3/FileSaver.min.js"></script>
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<link href='https://fonts.googleapis.com/css?family=Philosopher' rel='stylesheet' type='text/css'>
<script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<script src="https://rawgit.com/niklasvh/html2canvas/master/dist/html2canvas.js"></script>
<script src="https://files.codepedia.info/uploads/iScripts/html2canvas.js"></script>


<div id="firstshirt" class="container" style="float:left;">
<center><div id="wrapper"><div id="boxes" class="container5" style="float:center;">
 <div data-bind="foreach:items" class="fix_backround">
   <div class="item" data-bind="draggable:true,droppable:true">
        
      
      
</div></div>

<a href="" download><span id="image" class="preview-area"></span></a><div id="fotos" ><img class="modal-content" id="imgdisplay" /></div></div></div></center><br><br><br><br></div>
<input id="btn-Preview-Image" type="button" value="Preview"/><a id="download" download="my_image.png" href="#">Download image</a>

<select id="Gender" onchange="fctCheck(this.value);">
        <option value="">Choose Gender</option>
        <option value="men">Men</option>
   
    </select>  
   
    <select id="men" name="subselector" style="display:none">
      <option value="">Choose an item</option> 
      <option value="tsm">T-Shirt</option>
    
    
    </select>  
  
     
            
           <div style='display:none;' id="mtsm">
    <div class="colore white" data-image="https://torcdesign.com/shirts/white.jpg">
    </div>
    <div class="colore black active" data-image="https://torcdesign.com/shirts/black.jpg">
    </div>
   </div><p></p>
<select id="imajes">
        <option value="">Choose Image</option>
        <option value="new-upload">Upload Image</option>
        <option value="dog">Dog</option>
      
    </select> 

<select id="dog" name="subselector" class="subselector" style="display:none">
  <option value="">Choose an item</option>
  <option value="bulldog">Bulldog</option>
 
</select>






<div style='display:none;' id="bulldogimges" class="smallimages">
<div class="imgcontainerss" data-image="https://torcdesign.com/clipart/pT78gE6pc.gif">
    <img src="https://torcdesign.com/clipart/pT78gE6pc.gif" alt="Smiley face" width="55" height="55">
  </div>
<div class="imgcontainerss" data-image="https://torcdesign.com/clipart/LiKkRqkeT.gif">
    <img src="https://torcdesign.com/clipart/LiKkRqkeT.gif" alt="Smiley face" width="55" height="55">
  </div>
<div class="imgcontainerss" data-image="https://torcdesign.com/clipart/free-bulldog-clipart-031350.gif">
    <img src="https://torcdesign.com/clipart/free-bulldog-clipart-031350.gif" alt="Smiley face" width="55" height="55">
  </div></div>
<h3>result:</h3>
<div> <div id="previewImage">
    </div><a id="download" download="my_image.png" href="#">Download image</a></div>

Answer 1

您尚未对下载点击执行任何操作。

试试这个。

$('#download').click(function(){
   html2canvas($('#firstshirt'),{
    onrendered: function (canvas) {
         var a = document.createElement('a');
         a.href = canvas.toDataURL("image/jpeg").replace("image/jpeg", "image/octet-stream");
         a.download = 'test.jpg';
         a.click();
       }
    });
});