我是jointJs库的新手，我正在尝试将端口添加到我的自定义元素中，其中包含html代码。我按照本教程（http://www.jointjs.com/tutorial/html-elements）创建了我的元素。但是当我尝试向它添加端口时（基于本教程：http ://www.jointjs.com/tutorial/ports ）它不起作用。我遇到的另一个问题是，当我单击空白纸时，我希望文本框（自定义形状上的文本区域）消失，并且只有带有其内容的标签在元素上保持可见。为此，我使用了以下代码（但它没有给我上述功能）：
paper.on('blank:pointerdown', function(evt, x, y) { this.$box.find('textarea').toBack(); });
this.model.on('cell:pointerclick', function(evt, x, y) {this.$box.find('textarea').toFront();});
我的整个代码如下：
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="graph.css">
<script type="text/javascript" src="http://www.jointjs.com/downloads/joint.js" ></script>
<script src="http://www.jointjs.com/downloads/joint.shapes.devs.js" ></script>
<script src="http://www.jointjs.com/downloads/joint.shapes.devs.min.js" ></script>
</head>
<title>Test</title>
<body>
<div id="myholder"></div>
</body>
<script>
var graph = new joint.dia.Graph;
var paper = new joint.dia.Paper({
el: $('#myholder'),
width: 1500,
height: 700,
model: graph
});
// Create a custom element.
// ------------------------
joint.shapes.html = {};
joint.shapes.html.Element = joint.shapes.basic.Rect.extend({
defaults: joint.util.deepSupplement({
type: 'html.Element',
attrs: {
rect: { stroke: 'none', 'fill-opacity': 0 }
}
}, joint.shapes.basic.Rect.prototype.defaults)
});
// Create a custom view for that element that displays an HTML div above it.
// -------------------------------------------------------------------------
joint.shapes.html.ElementView = joint.dia.ElementView.extend({
template: [
'<div class="html-element">',
'<button class="delete">x</button>',
'<span id="lbl" value="Please write here"></span>',
'<textarea id="txt" type="text" value="Please write here"></textarea>',
'</div>'
].join(''),
initialize: function() {
_.bindAll(this, 'updateBox');
joint.dia.ElementView.prototype.initialize.apply(this, arguments);
this.$box = $(_.template(this.template)());
// Prevent paper from handling pointerdown.
this.$box.find('input,select').on('mousedown click', function(evt) { evt.stopPropagation(); });
// This is an example of reacting on the input change and storing the input data in the cell model.
this.$box.find('textarea').on('change', _.bind(function(evt) {
this.model.set('textarea', $(evt.target).val());
}, this));
this.$box.find('.delete').on('click', _.bind(this.model.remove, this.model));
// Update the box position whenever the underlying model changes.
this.model.on('change', this.updateBox, this);
// Remove the box when the model gets removed from the graph.
this.model.on('remove', this.removeBox, this);
this.updateBox();
},
render: function() {
joint.dia.ElementView.prototype.render.apply(this, arguments);
this.paper.$el.prepend(this.$box);
this.updateBox();
return this;
},
updateBox: function() {
// Set the position and dimension of the box so that it covers the JointJS element.
var bbox = this.model.getBBox();
// Example of updating the HTML with a data stored in the cell model.
paper.on('blank:pointerdown', function(evt, x, y) { this.$box.find('textarea').toBack(); });
this.$box.find('span').text(this.model.get('textarea'));
this.model.on('cell:pointerclick', function(evt, x, y) { this.$box.find('textarea').toFront(); });
this.$box.css({ width: bbox.width, height: bbox.height, left: bbox.x, top: bbox.y, transform: 'rotate(' + (this.model.get('angle') || 0) + 'deg)' });
},
removeBox: function(evt) {
this.$box.remove();
}
});
// Create JointJS elements and add them to the graph as usual.
// -----------------------------------------------------------
var el1 = new joint.shapes.html.Element({
position: { x: 600, y: 250 },
size: { width: 200, height: 100 },
inPorts: ['in'],
outPorts: ['out'],
attrs: {
'.inPorts circle': { fill: 'gray'},
'.outPorts circle': { fill: 'gray'}
},
textarea: 'Start writing'});
graph.addCells([el1]);
paper.on('cell:pointerdblclick', function(cellView, evt, x, y) {
var el2 = new joint.shapes.html.Element({ position: { x: 600, y: 400 }, size: { width: 200, height: 100 }, textarea: 'Start writing'});
var l = new joint.dia.Link({
source: { id: el1.id },
target: { id: el2.id },
attrs: { '.connection': { 'stroke-width': 1, stroke: 'gray' } }
});
graph.addCells([el2, l]);
});
</script>
</html>
我已经搜索了很多这些问题的答案，但我没有成功找到简单而全面的答案。任何帮助将不胜感激。谢谢。