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社区首页 >问答首页 >在动画期间使Click事件不可用

问在动画期间使Click事件不可用
EN

Stack Overflow用户
提问于 2018-08-09 17:00:46
回答 3查看 124关注 0票数 1

我是d3.js的初学者，我尝试用d3.js做一个可折叠的水平树。我从下面的示例开始：http://blockbuilder.org/d3noob/43a860bc0024792f8803bba8ca0d5ecd

有一个缺陷，我试图解决，但没有成功。当你在同一个圆圈上快速地点击几次时，它会多次启动相同的动画，然后它就会破坏树。

因此，我想知道是否有可能使点击事件在动画期间禁用，并使它在结束时可用？我试着使用这个method删除事件并将其放回原处，但它不起作用。

谢谢你的帮助。

javascript
d3.js
EN

回答 3

Stack Overflow用户

回答已采纳

发布于 2018-08-09 20:16:27

与使用超时、删除和添加事件侦听器或跟踪转换不同，您可以检查是否在具有d3.active(node)的任何单个节点上发生转换。它将返回null (在没有转换的情况下)，或者如果发生转换，则返回转换。如果正在发生转换，则忽略单击事件(或者更准确地说，如果正在发生转换，则不要对单击事件执行任何操作)。

首先，让我们检查一下所选内容是否具有过渡元素：

代码语言：javascript
复制
function isTransitioning(selection) {
    var transitioning = false;
    selection.each(function() { if(d3.active(this)) { transitioning = true; } })
    return transitioning;
}

然后，让我们在链接示例中的click函数中应用它：

代码语言：javascript
复制
  function click(d) {
    // Are no transitions happening?
    if(!isTransitioning(d3.selectAll("circle"))) {
        // If none are continue with updating the graph:
        if (d.children) {
            d._children = d.children;
            d.children = null;
          } else {
            d.children = d._children;
            d._children = null;
          }
        update(d);
    }
  }

给予我们：

​

代码语言：javascript
复制
var treeData =
  {
    "name": "Top Level",
    "children": [
      { 
        "name": "Level 2: A",
        "children": [
          { "name": "Son of A" },
          { "name": "Daughter of A" }
        ]
      },
      { "name": "Level 2: B" }
    ]
  };

// Set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 90},
    width = 600 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom;

// append the svg object to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");

var i = 0,
    duration = 750,
    root;

// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);

// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) { return d.children; });
root.x0 = height / 2;
root.y0 = 0;

// Collapse after the second level
root.children.forEach(collapse);

update(root);

// Collapse the node and all it's children
function collapse(d) {
  if(d.children) {
    d._children = d.children
    d._children.forEach(collapse)
    d.children = null
  }
}

function update(source) {

  // Assigns the x and y position for the nodes
  var treeData = treemap(root);

  // Compute the new tree layout.
  var nodes = treeData.descendants(),
      links = treeData.descendants().slice(1);

  // Normalize for fixed-depth.
  nodes.forEach(function(d){ d.y = d.depth * 180});

  // ****************** Nodes section ***************************

  // Update the nodes...
  var node = svg.selectAll('g.node')
      .data(nodes, function(d) {return d.id || (d.id = ++i); });

  // Enter any new modes at the parent's previous position.
  var nodeEnter = node.enter().append('g')
      .attr('class', 'node')
      .attr("transform", function(d) {
        return "translate(" + source.y0 + "," + source.x0 + ")";
    })
    .on('click', click);

  // Add Circle for the nodes
  nodeEnter.append('circle')
      .attr('class', 'node')
      .attr('r', 1e-6)
      .style("fill", function(d) {
          return d._children ? "lightsteelblue" : "#fff";
      });

  // Add labels for the nodes
  nodeEnter.append('text')
      .attr("dy", ".35em")
      .attr("x", function(d) {
          return d.children || d._children ? -13 : 13;
      })
      .attr("text-anchor", function(d) {
          return d.children || d._children ? "end" : "start";
      })
      .text(function(d) { return d.data.name; });

  // UPDATE
  var nodeUpdate = nodeEnter.merge(node);

  // Transition to the proper position for the node
  nodeUpdate.transition()
    .duration(duration)
    .attr("transform", function(d) { 
        return "translate(" + d.y + "," + d.x + ")";
     });

  // Update the node attributes and style
  nodeUpdate.select('circle.node')
    .attr('r', 10)
    .style("fill", function(d) {
        return d._children ? "lightsteelblue" : "#fff";
    })
    .attr('cursor', 'pointer');


  // Remove any exiting nodes
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) {
          return "translate(" + source.y + "," + source.x + ")";
      })
      .remove();

  // On exit reduce the node circles size to 0
  nodeExit.select('circle')
    .attr('r', 1e-6);

  // On exit reduce the opacity of text labels
  nodeExit.select('text')
    .style('fill-opacity', 1e-6);

  // ****************** links section ***************************

  // Update the links...
  var link = svg.selectAll('path.link')
      .data(links, function(d) { return d.id; });

  // Enter any new links at the parent's previous position.
  var linkEnter = link.enter().insert('path', "g")
      .attr("class", "link")
      .attr('d', function(d){
        var o = {x: source.x0, y: source.y0}
        return diagonal(o, o)
      });

  // UPDATE
  var linkUpdate = linkEnter.merge(link);

  // Transition back to the parent element position
  linkUpdate.transition()
      .duration(duration)
      .attr('d', function(d){ return diagonal(d, d.parent) });

  // Remove any exiting links
  var linkExit = link.exit().transition()
      .duration(duration)
      .attr('d', function(d) {
        var o = {x: source.x, y: source.y}
        return diagonal(o, o)
      })
      .remove();

  // Store the old positions for transition.
  nodes.forEach(function(d){
    d.x0 = d.x;
    d.y0 = d.y;
  });

  // Creates a curved (diagonal) path from parent to the child nodes
  function diagonal(s, d) {

    path = `M ${s.y} ${s.x}
            C ${(s.y + d.y) / 2} ${s.x},
              ${(s.y + d.y) / 2} ${d.x},
              ${d.y} ${d.x}`

    return path
  }

  // Toggle children on click.
  function click(d) {
	if(!isTransitioning(d3.selectAll("circle"))) {
		if (d.children) {
			d._children = d.children;
			d.children = null;
		  } else {
			d.children = d._children;
			d._children = null;
		  }
		update(d);
	}
  }
}



function isTransitioning(selection) {
	var transitioning = false;
	selection.each(function() { if(d3.active(this)) { transitioning = true; } })
	return transitioning;
}
代码语言：javascript
复制
.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}
代码语言：javascript
复制
<script src="https://d3js.org/d3.v4.min.js"></script>

​

我只选择了圆圈(您可以点击两次，而不需要从外观上停止转换)，这样效果很好，但是在某些情况下，您可能希望选择所有具有转换的项。在本例中，如果选择所有的g__s，则必须等待所有转换完成后再通过单击进行更新：

​

代码语言：javascript
复制
var treeData =
  {
    "name": "Top Level",
    "children": [
      { 
        "name": "Level 2: A",
        "children": [
          { "name": "Son of A" },
          { "name": "Daughter of A" }
        ]
      },
      { "name": "Level 2: B" }
    ]
  };

// Set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 90},
    width = 600 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom;

// append the svg object to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");

var i = 0,
    duration = 750,
    root;

// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);

// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) { return d.children; });
root.x0 = height / 2;
root.y0 = 0;

// Collapse after the second level
root.children.forEach(collapse);

update(root);

// Collapse the node and all it's children
function collapse(d) {
  if(d.children) {
    d._children = d.children
    d._children.forEach(collapse)
    d.children = null
  }
}

function update(source) {

  // Assigns the x and y position for the nodes
  var treeData = treemap(root);

  // Compute the new tree layout.
  var nodes = treeData.descendants(),
      links = treeData.descendants().slice(1);

  // Normalize for fixed-depth.
  nodes.forEach(function(d){ d.y = d.depth * 180});

  // ****************** Nodes section ***************************

  // Update the nodes...
  var node = svg.selectAll('g.node')
      .data(nodes, function(d) {return d.id || (d.id = ++i); });

  // Enter any new modes at the parent's previous position.
  var nodeEnter = node.enter().append('g')
      .attr('class', 'node')
      .attr("transform", function(d) {
        return "translate(" + source.y0 + "," + source.x0 + ")";
    })
    .on('click', click);

  // Add Circle for the nodes
  nodeEnter.append('circle')
      .attr('class', 'node')
      .attr('r', 1e-6)
      .style("fill", function(d) {
          return d._children ? "lightsteelblue" : "#fff";
      });

  // Add labels for the nodes
  nodeEnter.append('text')
      .attr("dy", ".35em")
      .attr("x", function(d) {
          return d.children || d._children ? -13 : 13;
      })
      .attr("text-anchor", function(d) {
          return d.children || d._children ? "end" : "start";
      })
      .text(function(d) { return d.data.name; });

  // UPDATE
  var nodeUpdate = nodeEnter.merge(node);

  // Transition to the proper position for the node
  nodeUpdate.transition()
    .duration(duration)
    .attr("transform", function(d) { 
        return "translate(" + d.y + "," + d.x + ")";
     });

  // Update the node attributes and style
  nodeUpdate.select('circle.node')
    .attr('r', 10)
    .style("fill", function(d) {
        return d._children ? "lightsteelblue" : "#fff";
    })
    .attr('cursor', 'pointer');


  // Remove any exiting nodes
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) {
          return "translate(" + source.y + "," + source.x + ")";
      })
      .remove();

  // On exit reduce the node circles size to 0
  nodeExit.select('circle')
    .attr('r', 1e-6);

  // On exit reduce the opacity of text labels
  nodeExit.select('text')
    .style('fill-opacity', 1e-6);

  // ****************** links section ***************************

  // Update the links...
  var link = svg.selectAll('path.link')
      .data(links, function(d) { return d.id; });

  // Enter any new links at the parent's previous position.
  var linkEnter = link.enter().insert('path', "g")
      .attr("class", "link")
      .attr('d', function(d){
        var o = {x: source.x0, y: source.y0}
        return diagonal(o, o)
      });

  // UPDATE
  var linkUpdate = linkEnter.merge(link);

  // Transition back to the parent element position
  linkUpdate.transition()
      .duration(duration)
      .attr('d', function(d){ return diagonal(d, d.parent) });

  // Remove any exiting links
  var linkExit = link.exit().transition()
      .duration(duration)
      .attr('d', function(d) {
        var o = {x: source.x, y: source.y}
        return diagonal(o, o)
      })
      .remove();

  // Store the old positions for transition.
  nodes.forEach(function(d){
    d.x0 = d.x;
    d.y0 = d.y;
  });

  // Creates a curved (diagonal) path from parent to the child nodes
  function diagonal(s, d) {

    path = `M ${s.y} ${s.x}
            C ${(s.y + d.y) / 2} ${s.x},
              ${(s.y + d.y) / 2} ${d.x},
              ${d.y} ${d.x}`

    return path
  }

  // Toggle children on click.
  function click(d) {
	if(!isTransitioning(d3.selectAll("g"))) {
		if (d.children) {
			d._children = d.children;
			d.children = null;
		  } else {
			d.children = d._children;
			d._children = null;
		  }
		update(d);
	}
  }
}



function isTransitioning(selection) {
	var transitioning = false;
	selection.each(function() { if(d3.active(this)) { transitioning = true; } })
	return transitioning;
}
代码语言：javascript
复制
.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}
代码语言：javascript
复制
<script src="https://d3js.org/d3.v4.min.js"></script>

​

票数 1
EN

Stack Overflow用户

发布于 2018-08-09 17:11:10

您可以抓取onclik事件并节流单击动画的持续时间，在本例中为750毫秒。

票数 0
EN

Stack Overflow用户

发布于 2018-08-09 17:19:41

您需要能够判断一个动画当前是否正在进行，并且能够同时处理多个动画。我在这里做了叉子：http://blockbuilder.org/WilliamNHarvey/4a39d034cef90be249b5ab003ecf775d

创建一个保存当前动画var animations = []的数组

然后单击，检查当前节点是否已被动画化。如果是，请取消单击事件。如果不是，将其添加到动画队列中。设置一个超时以便在750毫秒后删除它

代码语言：javascript
复制
function click(d) {
  if (isAnimated(d)) return;
  animations.push(d);
  setTimeout(function(){ removeAnimation(d) }, duration);
  if (d.children) {
    d._children = d.children;
    d.children = null;
  } else {
    d.children = d._children;
    d._children = null;
  }
  update(d);
}

这里的两个函数，isAnimated和removeAnimation，简单地遍历节点以找到您要查找的节点

代码语言：javascript
复制
function isAnimated(d) {
  res = false;
  animations.forEach(function(e, i) {
    if(e.id == d.id) res = true;
  });
  return res;
}

function removeAnimation(d) {
  animations.forEach(function(e, i) {
    if(e.id == d.id) animations.splice(i, 1);
  });
}
票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/51772426

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