children和_childrenjavascript
2.1摺疊函數html
// (1) 遞歸調用,有子孫的就把children(顯示)給_children(不顯示)暫存,便於摺疊, function collapse(d) { if (d.children) { console.log(d); d._children = d.children; d._children.forEach(collapse); d.children = null; } } // 摺疊根節點的每一個孩子 root.children.forEach(collapse); // 摺疊以後要重繪 update(root);
2.2 根據交互的狀況更新佈局並輸出java
function update(source) { // (2-1) 計算新樹的佈局 var nodes = tree.nodes(root).reverse(), links = tree.links(nodes); // (2-2) 樹的深度這裏樹d.y。樹的寬度最大720,要分四層,因此每層就乘180 nodes.forEach(function(d) { d.y = d.depth * 180;// 樹的x,y倒置了,因此這裏Y實際上是橫向的 }); // (2-3) 數據鏈接,根據id綁定數據 var node = svg.selectAll("g.node") .data(nodes, function(d) { return d.id //最初新點開的節點都沒有id || (d.id = ++i); //爲沒有id的節點添加上ID }); // (2-4) 點擊時增長新的子節點 var nodeEnter = node.enter().append("g") .attr("class", "node") .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; }) .on("click", click); nodeEnter.append("circle") .attr("r", 1e-6) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeEnter.append("text") .attr("x", function(d) { return d.children || d._children ? -10 : 10; }) .attr("dy", ".35em") .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; }) .text(function(d) { return d.name; }) .style("fill-opacity", 1e-6); // (2-5) 原有節點更新到新位置 var nodeUpdate = node.transition() .duration(duration) .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; }); nodeUpdate.select("circle") .attr("r", 4.5) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeUpdate.select("text") .style("fill-opacity", 1); // (2-6) 摺疊節點的子節點收縮回來 var nodeExit = node.exit().transition() .duration(duration) .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; }) .remove(); nodeExit.select("circle") .attr("r", 1e-6); nodeExit.select("text") .style("fill-opacity", 1e-6); // (2-7) 數據鏈接,根據目標節點的id綁定數據 var link = svg.selectAll("path.link") .data(links, function(d) { return d.target.id; }); // (2-8) 增長新鏈接 link.enter().insert("path", "g") .attr("class", "link") .attr("d", function(d) { var o = {x: source.x0, y: source.y0}; return diagonal({source: o, target: o}); }); // (2-9) 原有鏈接更新位置 link.transition() .duration(duration) .attr("d", diagonal); // (2-10) 摺疊的連接,收縮到源節點處 link.exit().transition() .duration(duration) .attr("d", function(d) { var o = {x: source.x, y: source.y}; return diagonal({source: o, target: o}); }) .remove(); // 把舊位置存下來,用以過渡 nodes.forEach(function(d) { d.x0 = d.x; d.y0 = d.y; }); }
2.3 點擊時切換摺疊node
// (3) 切換摺疊與否 function click(d) { if (d.children) { d._children = d.children; d.children = null; } else { d.children = d._children; d._children = null; } update(d);// 從新渲染 }
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>testD3-26-CollapsibleTree.html</title> <script type="text/javascript" src="d3.js"></script> <style> .node circle { fill:yellow ; stroke: red; stroke-width: 1.5px; } .node { font: 10px sans-serif ; } .link { fill: green; stroke: #ccc; stroke-width: 1.5px; } </style> </head> <body> <script type="text/javascript"> //位置參數 var margin = {top: 20, right: 120, bottom: 20, left: 120}, width = 960 - margin.right - margin.left, height = 800 - margin.top - margin.bottom; var i = 0, duration = 750, root; // 聲明樹佈局 var tree = d3.layout.tree() .size([height, width]); // 指定爲橫向佈局 var diagonal = d3.svg.diagonal() .projection(function(d) { return [d.y, d.x]; }); var svg = d3.select("body").append("svg") .attr("width", width + margin.right + margin.left) .attr("height", height + margin.top + margin.bottom) .append("g") .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); d3.json("tree.json", function(error, flare) { // 根節點和位置 root = flare; root.x0 = height / 2; root.y0 = 0; //(1) 摺疊函數,遞歸調用,有子孫的就把children(顯示)給_children(不顯示)暫存,便於摺疊, function collapse(d) { if (d.children) { console.log(d); d._children = d.children; d._children.forEach(collapse); d.children = null; } } // 摺疊根節點的每一個孩子 root.children.forEach(collapse); // 摺疊以後要重繪 update(root); }); //(2) 更新佈局 function update(source) { // (2-1) 計算新樹的佈局 var nodes = tree.nodes(root).reverse(), links = tree.links(nodes); // (2-2) 樹的深度這裏樹d.y。樹的寬度最大720,要分四層,因此每層就乘180 nodes.forEach(function(d) { d.y = d.depth * 180;// 樹的x,y倒置了,因此這裏Y實際上是橫向的 }); // (2-3) 數據鏈接,根據id綁定數據 var node = svg.selectAll("g.node") .data(nodes, function(d) { return d.id //最初新點開的節點都沒有id || (d.id = ++i); //爲沒有id的節點添加上ID }); // (2-4) 點擊時增長新的子節點 var nodeEnter = node.enter().append("g") .attr("class", "node") .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; }) .on("click", click); nodeEnter.append("circle") .attr("r", 1e-6) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeEnter.append("text") .attr("x", function(d) { return d.children || d._children ? -10 : 10; }) .attr("dy", ".35em") .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; }) .text(function(d) { return d.name; }) .style("fill-opacity", 1e-6); // (2-5) 原有節點更新到新位置 var nodeUpdate = node.transition() .duration(duration) .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; }); nodeUpdate.select("circle") .attr("r", 4.5) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeUpdate.select("text") .style("fill-opacity", 1); // (2-6) 摺疊節點的子節點收縮回來 var nodeExit = node.exit().transition() .duration(duration) .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; }) .remove(); nodeExit.select("circle") .attr("r", 1e-6); nodeExit.select("text") .style("fill-opacity", 1e-6); // (2-7) 數據鏈接,根據目標節點的id綁定數據 var link = svg.selectAll("path.link") .data(links, function(d) { return d.target.id; }); // (2-8) 增長新鏈接 link.enter().insert("path", "g") .attr("class", "link") .attr("d", function(d) { var o = {x: source.x0, y: source.y0}; return diagonal({source: o, target: o}); }); // (2-9) 原有鏈接更新位置 link.transition() .duration(duration) .attr("d", diagonal); // (2-10) 摺疊的連接,收縮到源節點處 link.exit().transition() .duration(duration) .attr("d", function(d) { var o = {x: source.x, y: source.y}; return diagonal({source: o, target: o}); }) .remove(); // 把舊位置存下來,用以過渡 nodes.forEach(function(d) { d.x0 = d.x; d.y0 = d.y; }); } // (3) 切換摺疊與否 function click(d) { if (d.children) { d._children = d.children; d.children = null; } else { d.children = d._children; d._children = null; } update(d);// 從新渲染 }</script></body></html>