问题描述
我进行了很多搜索，但找不到与我的需求相关的场景.我想将图像从工具栏拖放到画布，而不是从画布拖放到另一个画布.
I have searched a lot, but I could not find a scenario which is relevant to my need. I want to drag and drop images from a toolbar to a canvas, not from a canvas to another canvas.
请帮助我.提前致谢
推荐答案
演示:http://jsfiddle.net/m1erickson/2Us2S/
使用 jquery-ui 创建可拖动元素.
Use jquery-ui to create draggable elements.
$("#myToolbarImageElement").draggable();
使用键值对的数据负载加载这些元素.
Load these elements with data payloads which are key-value pairs.
在您的情况下，这可能是您想要在画布上绘制的图像对象.
In your case this might be an image object that you want drawn on the canvas.
$("#myToolbarImageElement").data("image",myImageObject);
将您的画布设置为拖放区:
Set your canvas as a drop zone:
$("#myCanvas").droppable({drop:myDropHandler});
当您将元素放在画布上时，您可以读取数据(图像)并将该图像绘制到画布上.
When you drop the elements on canvas you can read the data (image) and drawImage that image to the canvas.
function myDropHandler(e,ui){
var x = ui.offset.left - $("#myCanvas").offset.left;
var y = ui.offset.top - $("#myCanvas").offset.top;
var image = ui.draggable.data("image");
// draw on canvas
drawImage(image,x,y);
}
这是一个很好的教程，关于使用 jquery-ui 的数据有效负载拖放元素:
Here's a nice tutorial on drag-drop elements with data payloads using jquery-ui:
http://www.elated.com/articles/drag-and-drop-with-jquery-your-essential-guide/
这篇关于HTML5 将图像从工具栏拖放到画布的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！