JointJS:创建链接时需要目标元素

Question

我试图避免链接在空间中结束，我只想允许链接将一个元素与另一个元素连接起来。我当前的代码是:

new joint.shapes.basic.Rect({
  id: id,
  size: {
    width: width,
    height: height
  },
  attrs: {
    text: {
      text: label,
      'font-size': letterSize
    },
    rect: {
      width: width,
      height: height,
      rx: 5,
      ry: 5,
      stroke: '#555',
      'magnet': true
    }
  }
});

对于论文:

var paper = new joint.dia.Paper({
  el: $('#paper-basic'),
  width: 1250,
  height: 1000,
  model: graph,
  gridSize: 1,
  validateConnection: function(cellViewS, magnetS, cellViewT, magnetT, end, linkView) {
    // Prevent linking from output ports to input ports within one element.
    if (cellViewS === cellViewT) return false;
    // Prevent linking to input ports.
    return magnetT;
  },
  markAvailable: true
});

如何要求每个链接都有源和目标？也许通过扩展 validateConnection？

Answer 1

如果这仍然相关，现在在 Paper 元素上有一个名为 linkPinning 的选项:

http://jointjs.com/api#dia.Paper.prototype.options

linkPinning - when set to true (the default), links can be pinned to the paper meaning a source or target of a link can be a point. If you do not want to let the user to drag a link and drop it somewhere in a blank paper area, set this to false. The effect is that the link will be returned to its original position whenever the user drops it somewhere in a blank paper area.