我使用了以下行：
cy.json({ elements: treeData });
为了更新我的图表中的数据（使用cytoscape.js）。该图现在具有新数据，但节点位于先前的位置。我该如何解决这个问题？我没有特定的位置，我想根据新节点获得默认位置。
编辑：
错误位置的问题可能源于cy.json（）在布局完成之前没有更新图形，尝试使用您的代码：
cy.json({ elements: treeData });
cy.ready(function () {
var layout = cy.layout({ name: 'breadthfirst', directed: true, padding: 2 });
layout.run();
});
函数cy.json()有两个功能，第一个是图的导出，第二个是图的导入。使用导入时，您可以指定要导入的内容：
你想要节点的位置，所以你必须使用cyjson。以下是整个事情的一个例子：
var json;
var cy = (window.cy = cytoscape({
container: document.getElementById("cy"),
boxSelectionEnabled: false,
autounselectify: true,
style: [{
selector: "node",
css: {
content: "data(id)",
"text-valign": "center",
"text-halign": "center",
height: "60px",
width: "100px",
shape: "rectangle",
"background-color": "data(faveColor)"
}
},
{
selector: "edge",
css: {
"curve-style": "bezier",
"control-point-step-size": 40,
"target-arrow-shape": "triangle"
}
}
],
elements: {
nodes: [{
data: {
id: "Top",
faveColor: "#2763c4"
}
},
{
data: {
id: "yes",
faveColor: "#37a32d"
}
},
{
data: {
id: "no",
faveColor: "#2763c4"
}
},
{
data: {
id: "Third",
faveColor: "#2763c4"
}
},
{
data: {
id: "Fourth",
faveColor: "#56a9f7"
}
}
],
edges: [{
data: {
source: "Top",
target: "yes"
}
},
{
data: {
source: "Top",
target: "no"
}
},
{
data: {
source: "no",
target: "Third"
}
},
{
data: {
source: "Third",
target: "Fourth"
}
},
{
data: {
source: "Fourth",
target: "Third"
}
}
]
},
layout: {
name: "dagre"
}
}));
document.getElementById('save').addEventListener('click', function() {
json = cy.json();
});
document.getElementById('load').addEventListener('click', function() {
cy.json(json);
});body {
font: 14px helvetica neue, helvetica, arial, sans-serif;
}
#cy {
height: 85%;
width: 100%;
float: right;
position: absolute;
}<html>
<head>
<meta charset=utf-8 />
<meta name="viewport" content="user-scalable=no, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, minimal-ui">
<script src="https://unpkg.com/[email protected]/dist/cytoscape.min.js">
</script>
<!-- cyposcape dagre -->
<script src="https://unpkg.com/[email protected]/dist/dagre.js"></script>
<script src="https://cdn.rawgit.com/cytoscape/cytoscape.js-dagre/1.5.0/cytoscape-dagre.js"></script>
</head>
<body>
<b id="save" style="cursor: pointer; color: darksalmon">Save graph</b> / <b id="load" style="cursor: pointer; color: darkmagenta">Load graph</b>
<div id="cy"></div>
</body>
</html>