Jquery拖放在html画布上 [英] Jquery drag drop on html canvas

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本文介绍了Jquery拖放在html画布上的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

你好我想把它从div(li items)拖到html画布上。我有一个帮助程序克隆的问题。



当我简单地拖动项目没有帮助者,它将itms放在画布上,但是当我使用帮助克隆它不会将项目拖放到画布上。我已经附上一个小提琴,请检查一下。



HTML

  ; ul id =drag> 
< li class =new-item>拖动我down1< / li>
< li class =new-item>拖动我down2< / li>
< li class =new-item>拖动我down3< / li>
< / ul>
< canvas id =myCanvaswidth =200height =200style =border:1px solid#000000;>< / canvas>

JS

  $(#drag li)。draggable({
helper:'clone'
});

JS FIDDLE



提前感谢

解决方案

如果要在画布上打印该文本,则需要使用jQuery droppable方法,



检查此小提琴

  $(#myCanvas) ($ {
接受:li,
drop:function(event,ui){
var context = $(this)[0] .getContext(2d);
context.font =16px helvetica;
context.fillText($(ui.draggable).clone()。text(),ui.position.left - event.target.offsetLeft,ui.position .top - event.target.offsetTop);
}
});


Hello I am trying to drag itms from a div ( li items) onto a html canvas. I have an issue with helper clone.

When i simply drag items without helper, it drop itms onto canvas, but when i use helper clone it does not drop items onto canvas. I have attached a fiddle please check it.

HTML

<ul id="drag">
    <li class="new-item">Drag me down1</li>
    <li class="new-item">Drag me down2</li>
    <li class="new-item">Drag me down3</li>
</ul>
<canvas id="myCanvas" width="200" height="200" style="border:1px solid #000000;"></canvas>

JS

$("#drag li").draggable({
    helper: 'clone'
});

JS FIDDLE

Thanks in advance.

解决方案

If you want to print that text on canvas, you need to use jQuery droppable method,

check this fiddle

$("#myCanvas").droppable({
    accept: "li",
    drop: function(event,ui){
        var context = $(this)[0].getContext("2d");
        context.font = "16px helvetica";
        context.fillText($(ui.draggable).clone().text(),ui.position.left - event.target.offsetLeft,ui.position.top - event.target.offsetTop);
    }
});

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