拖拽画布就像图片一样

Question

拖拽画布就像图片一样

4

我们公司的网站使用canvas元素在页面上呈现图表。然而，这些元素无法被拖放到Microsoft Word文档或电子邮件客户端中。因此，我想出了一种方法，通过从画布中获取base64数据，在鼠标按下时用一个外观相同的img替换画布。

在鼠标按下时，画布被正确地替换为图像，并在鼠标抬起时重新放置。然而，这并不允许拖放图像标签，可能是因为替换发生得太晚了。

我们使用了一个插件，还提供了对图表特定区域的工具提示，因此我不能在悬停/悬停结束时替换元素，因为那样会停止工具提示的工作。

如何使图像本身可以拖放？这里是一个可行的JSFiddle示例。

- user3714134

如果你的图表在渲染到画布后没有变化，你可以采取以下方法：（1）在应用程序开始时创建内存画布来绘制图表，然后（2）使用canvas.toDataURL创建img元素来显示在屏幕上。即使图表不是静态的，这可能是最接近的解决方案，可以保持拖拽和工具提示功能不受影响。 - markE

2个回答

1

你的代码运行正确，但是无法将图像拖放到Word中，因为我认为该图像是base64编码的。如果你将图像拖放到浏览器的新标签页中或添加CSS border 或图像id，你会看到这一点。 图像：

data:image/png;base64,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

如果您将上面的base64代码复制并粘贴到浏览器地址栏中，它将正常呈现，但是如果在Word中执行相同操作，则无法工作，因此您需要在显示按下鼠标之前先解码图像。

更多信息：使用javascript进行Base64编码/解码客户端JavaScript中的Base64编码和解码

编辑：
您可以右键点击画布，然后选择“另存为图像”，这样它将被保存为图像文件。

- Mi-Creativity

好主意，但是如果我在页面上直接放置一个使用您提供的数据URL的img元素，拖放图像似乎按预期工作。也许它在Word中不起作用，但它似乎在我主要需要它的Thunderbird中起作用。问题似乎是浏览器在画布被图像替换之前尝试“拖动”画布。 - user3714134

如果您从fiddle中拖放图像或从浏览器在独立窗口中呈现的带有bas64 URL的图像，则会显示相同的结果，其中包含许多东亚符号。 - Mi-Creativity

然而，在Thunderbird中，如果您尝试插入图像 顶部菜单 > 插入 > 图像，并且在图像位置字段中粘贴此base64代码，则在图像预览框中，您将看到完全相同的图像正确呈现，并且它将被插入到应该的位置。 - Mi-Creativity

另一个选项是右键单击画布，然后选择“另存为图像”，这样它就会保存为图像文件。 - Mi-Creativity

@markE，你说得对，我刚刚用IE11测试了一下，甚至都不能拖放，所以在任何情况下都不能使用IE。 - Mi-Creativity

显示剩余2条评论

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- markE · Accepted Answer

在应用程序开始时，预先构建您的img元素，而不是花时间“即时”完成它。

使用内存画布创建您的图表：

var canvas1=document.createElement('canvas');
// draw your chart on canvas1

然后从画布中创建img元素。

var chart1=new Image();
document.body.appendChild(chart1);
chart1.src=canvas1.toDataURL();