Question

我正在使用D3和套索库来可视化数据/使其具有交互性。目前，一旦选择，我正尝试将团队名称记录到控制台。但是，相反，我收到了selected.map is not a function错误。我已经检查了这个post，但是它对我没有帮助，注释也不能真正解释我为什么会出错。

var data = [["Arsenal",-0.0032967741593940836, 0.30399753945657115],["Chelsea", 0.2752159801936051, -0.0389675484210763], ["Liverpool",-0.005096951348655329, 0.026678627680541075], ["Manchester City",-0.004715381791104284, -0.12338379196523988], ["Manchester United",0.06877966010653305, -0.0850615090351779], ["Tottenham",-0.3379518099485709, -0.09933664174939877]];

var selectedTeams = [];

const colours = d3.scaleOrdinal()
    .domain(data)
    .range(["#F8B195", "#F67280", "#C06C84", "#6C5B7B", "#355C7D", "#2A363B"]);

var canvasW = 675;
var canvasH = 600;   
var w = 365;
var h = 365;
var xPadding = 30;
var yPadding = 20;
var padding = 10;
var border = 0.5;
var bordercolor = 'black';

var xScale = d3.scaleLinear()
    .range([xPadding, w - padding])
    .domain([-1, 1]);

var yScale = d3.scaleLinear()
    .range([h - yPadding, padding])
    .domain([-1, 1]);

var svg = d3.select('body')
    .append("svg")
    .attr('width', canvasW)
    .attr('height', canvasH);

var circles = svg.selectAll("circle")
    .data(data)
    .enter()
    .append("circle")
    .attr("r", 7)
    .attr("cx", function(d) { return xScale(d[1]); })
    .attr("cy", function(d) { return yScale(d[2]); })
    .attr("fill", function(d) {
      var result = null;

      if (data.indexOf(d) >= 0) {
        result = colours(d);
      } else {
        result = "white";
      }
      return result;               
    });

    var lasso_start = function() {
        lasso.items()
            .attr("r",7) 
            .classed("not_possible",true)
            .classed("selected",false);
    };

    var lasso_draw = function() {

        lasso.possibleItems()
            .classed("not_possible",false)
            .classed("possible",true);

        lasso.notPossibleItems()
            .classed("not_possible",true)
            .classed("possible",false);
    };

    var lasso_end = function() {

        lasso.items()
            .classed("not_possible",false)
            .classed("possible",false);

        lasso.selectedItems()
            .classed("selected", true)
            .attr("r", 13);

        var selected = lasso.selectedItems().filter(function(d) {
            return d.selected === true;
        })

        var selectedDots = selected.map(d=>d.id);

        selectedTeams.slice(0, selectedTeams.length);
        selectedTeams.push(selectedDots);
        console.log(selectedTeams)


        lasso.items().filter(function(d) {
            return d.selected ===false 
        })
            .classed({"not_possible":false,"possible":false})
            .attr("r",7);

    };

    var area = svg.append("rect")
        .attr("width", w)
        .attr("height", h)
        .style("opacity", 0);

    var lasso = d3.lasso()
        .closePathSelect(true)
        .closePathDistance(100)
        .items(circles)
        .targetArea(area)
        .on("start",lasso_start)
        .on("draw",lasso_draw)
        .on("end",lasso_end);

    svg.call(lasso);

    lasso.items(d3.selectAll("circles"));

Answer 1

selected是d3选择，它不是数组，没有map方法。如果要使用属于选择的数据，则可以使用selection.data()方法，如果该方法未提供任何参数，它将以数组形式返回绑定数据：

selected.data().map(....

这应该解释错误：selected.map is not a function，因为D3选择没有映射方法。

但是，您还有另一个问题需要解决：您的选择为空，因此没有要检索的绑定数据。您可以使用console.log(selection.size())

查看

我对d3套索的这种实现方式不熟悉，但是看来您可以使用以下方法创建所选圆的选择：

var selected = lasso.selectedItems()...

由于绑定数据不包含指示是否已选择节点（d.selected）的属性，因此您现有的方法无效（过滤条件永远不会为真）。 此外，在选择上使用.filter会返回一个新选择，而不是一个数组。

假设我理解目标，并使用以上两点，这是一个套索，显示了所选球队的名称：

path {
  fill: #ccc;
  opacity: 0.4;
  stroke: black;
  stroke-width: 2px;

}

<!DOCTYPE html>
<head>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
!function(t,n){"object"==typeof exports&&"undefined"!=typeof module?n(exports,require("d3-selection"),require("d3-drag")):"function"==typeof define&&define.amd?define(["exports","d3-selection","d3-drag"],n):n(t.d3=t.d3||{},t.d3,t.d3)}(this,function(t,n,r){"use strict";function e(t,n){return n={exports:{}},t(n,n.exports),n.exports}function o(){function t(t){function u(){p=[],h="",_.attr("d",null),m.attr("d",null),r.nodes().forEach(function(t){t.__lasso.possible=!1,t.__lasso.selected=!1,t.__lasso.hoverSelect=!1,t.__lasso.loopSelect=!1;var n=t.getBoundingClientRect();t.__lasso.lassoPoint=[Math.round(n.left+n.width/2),Math.round(n.top+n.height/2)]}),s&&r.on("mouseover.lasso",function(){this.__lasso.hoverSelect=!0}),i.start()}function l(){var t,n;"touchmove"===d3.event.sourceEvent.type?(t=d3.event.sourceEvent.touches[0].clientX,n=d3.event.sourceEvent.touches[0].clientY):(t=d3.event.sourceEvent.clientX,n=d3.event.sourceEvent.clientY);var s=d3.mouse(this)[0],u=d3.mouse(this)[1];""===h?(h=h+"M "+s+" "+u,v=[t,n],d=[s,u],b.attr("cx",s).attr("cy",u).attr("r",7).attr("display",null)):h=h+" L "+s+" "+u,p.push([t,n]);var l=Math.sqrt(Math.pow(t-v[0],2)+Math.pow(n-v[1],2)),f="M "+s+" "+u+" L "+d[0]+" "+d[1];_.attr("d",h),m.attr("d",f),a=l<=e,a&&o?m.attr("display",null):m.attr("display","none"),r.nodes().forEach(function(t){t.__lasso.loopSelect=!(!a||!o)&&c(p,t.__lasso.lassoPoint)<1,t.__lasso.possible=t.__lasso.hoverSelect||t.__lasso.loopSelect}),i.draw()}function f(){r.on("mouseover.lasso",null),r.nodes().forEach(function(t){t.__lasso.selected=t.__lasso.possible,t.__lasso.possible=!1}),_.attr("d",null),m.attr("d",null),b.attr("display","none"),i.end()}var h,v,d,p,g=t.append("g").attr("class","lasso"),_=g.append("path").attr("class","drawn"),m=g.append("path").attr("class","loop_close"),b=g.append("circle").attr("class","origin"),M=d3.drag().on("start",u).on("drag",l).on("end",f);n.call(M)}var n,r=[],e=75,o=!0,a=!1,s=!0,i={start:function(){},draw:function(){},end:function(){}};return t.items=function(n){if(!arguments.length)return r;r=n;var e=r.nodes();return e.forEach(function(t){t.__lasso={possible:!1,selected:!1}}),t},t.possibleItems=function(){return r.filter(function(){return this.__lasso.possible})},t.selectedItems=function(){return r.filter(function(){return this.__lasso.selected})},t.notPossibleItems=function(){return r.filter(function(){return!this.__lasso.possible})},t.notSelectedItems=function(){return r.filter(function(){return!this.__lasso.selected})},t.closePathDistance=function(n){return arguments.length?(e=n,t):e},t.closePathSelect=function(n){return arguments.length?(o=n===!0,t):o},t.isPathClosed=function(n){return arguments.length?(a=n===!0,t):a},t.hoverSelect=function(n){return arguments.length?(s=n===!0,t):s},t.on=function(n,r){if(!arguments.length)return i;if(1===arguments.length)return i[n];var e=["start","draw","end"];return e.indexOf(n)>-1&&(i[n]=r),t},t.targetArea=function(r){return arguments.length?(n=r,t):n},t}var a=e(function(t){function n(t,n,e){var o=t*n,a=r*t,s=a-t,i=a-s,u=t-i,l=r*n,f=l-n,c=l-f,h=n-c,v=o-i*c,d=v-u*c,p=d-i*h,g=u*h-p;return e?(e[0]=g,e[1]=o,e):[g,o]}t.exports=n;var r=+(Math.pow(2,27)+1)}),s=e(function(t){function n(t,n){var r=t+n,e=r-t,o=r-e,a=n-e,s=t-o,i=s+a;return i?[i,r]:[r]}function r(t,r){var e=0|t.length,o=0|r.length;if(1===e&&1===o)return n(t[0],r[0]);var a,s,i=e+o,u=new Array(i),l=0,f=0,c=0,h=Math.abs,v=t[f],d=h(v),p=r[c],g=h(p);d<g?(s=v,f+=1,f<e&&(v=t[f],d=h(v))):(s=p,c+=1,c<o&&(p=r[c],g=h(p))),f<e&&d<g||c>=o?(a=v,f+=1,f<e&&(v=t[f],d=h(v))):(a=p,c+=1,c<o&&(p=r[c],g=h(p)));for(var _,m,b,M,y,w=a+s,x=w-a,j=s-x,E=j,A=w;f<e&&c<o;)d<g?(a=v,f+=1,f<e&&(v=t[f],d=h(v))):(a=p,c+=1,c<o&&(p=r[c],g=h(p))),s=E,w=a+s,x=w-a,j=s-x,j&&(u[l++]=j),_=A+w,m=_-A,b=_-m,M=w-m,y=A-b,E=y+M,A=_;for(;f<e;)a=v,s=E,w=a+s,x=w-a,j=s-x,j&&(u[l++]=j),_=A+w,m=_-A,b=_-m,M=w-m,y=A-b,E=y+M,A=_,f+=1,f<e&&(v=t[f]);for(;c<o;)a=p,s=E,w=a+s,x=w-a,j=s-x,j&&(u[l++]=j),_=A+w,m=_-A,b=_-m,M=w-m,y=A-b,E=y+M,A=_,c+=1,c<o&&(p=r[c]);return 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n=t.length>>1;return["sum(",o(t.slice(0,n)),",",o(t.slice(n)),")"].join("")}function i(t){if(2===t.length)return[["sum(prod(",t[0][0],",",t[1][1],"),prod(-",t[0][1],",",t[1][0],"))"].join("")];for(var r=[],a=0;a<t.length;++a)r.push(["scale(",o(i(n(t,a))),",",e(a),t[0][a],")"].join(""));return r}function f(t){for(var e=[],a=[],s=r(t),u=[],l=0;l<t;++l)0===(1&l)?e.push.apply(e,i(n(s,l))):a.push.apply(a,i(n(s,l))),u.push("m"+l);var f=o(e),c=o(a),h="orientation"+t+"Exact",_=["function ",h,"(",u.join(),"){var p=",f,",n=",c,",d=sub(p,n);return d[d.length-1];};return ",h].join(""),m=new Function("sum","prod","scale","sub",_);return m(d,v,p,g)}function c(t){var n=x[t.length];return n||(n=x[t.length]=f(t.length)),n.apply(void 0,t)}function h(){for(;x.length<=_;)x.push(f(x.length));for(var n=[],r=["slow"],e=0;e<=_;++e)n.push("a"+e),r.push("o"+e);for(var o=["function getOrientation(",n.join(),"){switch(arguments.length){case 0:case 1:return 0;"],e=2;e<=_;++e)o.push("case ",e,":return 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b>x||-b>x?b:w(t,n,r,e)}];h()}),c=e(function(t){function n(t,n){for(var e=n[0],o=n[1],a=t.length,s=1,i=a,u=0,l=a-1;u<i;l=u++){var f=t[u],c=t[l],h=f[1],v=c[1];if(v<h){if(v<o&&o<h){var d=r(f,c,n);if(0===d)return 0;s^=0<d|0}else if(o===h){var p=t[(u+1)%a],g=p[1];if(h<g){var d=r(f,c,n);if(0===d)return 0;s^=0<d|0}}}else if(h<v){if(h<o&&o<v){var d=r(f,c,n);if(0===d)return 0;s^=d<0|0}else if(o===h){var p=t[(u+1)%a],g=p[1];if(g<h){var d=r(f,c,n);if(0===d)return 0;s^=d<0|0}}}else if(o===h){var _=Math.min(f[0],c[0]),m=Math.max(f[0],c[0]);if(0===u){for(;l>0;){var b=(l+a-1)%a,M=t[b];if(M[1]!==o)break;var y=M[0];_=Math.min(_,y),m=Math.max(m,y),l=b}if(0===l)return _<=e&&e<=m?0:1;i=l+1}for(var w=t[(l+a-1)%a][1];u+1<i;){var M=t[u+1];if(M[1]!==o)break;var y=M[0];_=Math.min(_,y),m=Math.max(m,y),u+=1}if(_<=e&&e<=m)return 0;var x=t[(u+1)%a][1];e<_&&w<o!=x<o&&(s^=1)}}return 2*s-1}t.exports=n;var r=f});t.lasso=o,Object.defineProperty(t,"__esModule",{value:!0})});</script>
</head>
<body>

<script>
var data = [["Arsenal",-0.0032967741593940836, 0.30399753945657115],["Chelsea", 0.2752159801936051, -0.0389675484210763], ["Liverpool",-0.005096951348655329, 0.026678627680541075], ["Manchester City",-0.004715381791104284, -0.12338379196523988], ["Manchester United",0.06877966010653305, -0.0850615090351779], ["Tottenham",-0.3379518099485709, -0.09933664174939877]];

var selectedTeams = [];

const colours = d3.scaleOrdinal()
    .domain(data)
    .range(["#F8B195", "#F67280", "#C06C84", "#6C5B7B", "#355C7D", "#2A363B"]);

var canvasW = 675;
var canvasH = 600;   
var w = 365;
var h = 365;
var xPadding = 30;
var yPadding = 20;
var padding = 10;
var border = 0.5;
var bordercolor = 'black';

var xScale = d3.scaleLinear()
    .range([xPadding, w - padding])
    .domain([-1, 1]);

var yScale = d3.scaleLinear()
    .range([h - yPadding, padding])
    .domain([-1, 1]);

var svg = d3.select('body')
    .append("svg")
    .attr('width', canvasW)
    .attr('height', canvasH);

var circles = svg.selectAll("circle")
    .data(data)
    .enter()
    .append("circle")
    .attr("r", 7)
    .attr("cx", function(d) { return xScale(d[1]); })
    .attr("cy", function(d) { return yScale(d[2]); })
    .attr("fill", function(d) {
      var result = null;

      if (data.indexOf(d) >= 0) {
        result = colours(d);
      } else {
        result = "white";
      }
      return result;               
    });

    var lasso_start = function() {
        lasso.items()
            .attr("r",7) 
            .classed("not_possible",true)
            .classed("selected",false);
    };

    var lasso_draw = function() {

        lasso.possibleItems()
            .classed("not_possible",false)
            .classed("possible",true);

        lasso.notPossibleItems()
            .classed("not_possible",true)
            .classed("possible",false);
    };

    var lasso_end = function() {

        lasso.items()
            .classed("not_possible",false)
            .classed("possible",false);

        var selected = lasso.selectedItems()
            .classed("selected", true)
            .attr("r", 13);

		var selectedDots = selected.data().map(d=>d[0]);
        console.log(selectedDots)

    };

    var area = svg.append("rect")
        .attr("width", w)
        .attr("height", h)
        .style("opacity", 0);

    var lasso = d3.lasso()
        .closePathSelect(true)
        .closePathDistance(100)
        .items(circles)
        .targetArea(area)
        .on("start",lasso_start)
        .on("draw",lasso_draw)
        .on("end",lasso_end);

    svg.call(lasso);

	
	</script>

这里还有其他更改，以创建一个最小的示例，同时解决了与代码无关的问题（d3.selectAll('circles')（lasso.items也不需要更新），其他使用{{1}的代码}，以及如何映射名称和记录名称。

我正在使用您先前链接的一个answer所链接的套索版本，如果它不正确或与您使用的版本不兼容，请指明并我会更新。

未定义的属性“地图”（JavaScript）

1 个答案: