d3.js - D3 How to filter menu based on nested data -


i have following plunk https://plnkr.co/edit/gdbue99nnnmtyp9ipr1d?p=info , struggling dropdown menu working nested data. ive generated menu first level nest ('starting point'), shows list of nationalities generated second level nest ('nat'). want use menu load different 'nat' assosicated each 'starting point'.

previously created menu this, doesn't seem working 'nested_data'. d3.filter() wrong this?

list.on('change', function() {       var selected = d3.select(this).select("select").property("value")       var cd = nested_data.filter(function(d) {            return (selected == d.key)       });    updatenested_data(cd)   });  ...  var filter = nested_data.filter(function(d) {        return ("berkner island" == d.key)    });   updatenested_data(filter)

i'm having problem exit() in update function, think because i'm binding data early? question i'd focus on how menu working.

full code

d3.csv("data.csv", function(csv) {    var nested_data = d3.nest()       .key(function(d) {       return d['starting point'];       })       .key(function(d) {       return d.nat;       })       .entries(csv);    // create dropdown   var list = d3.select("#opts")    list.append("select").selectall("option")       .data(nested_data)       .enter().append("option")       .attr("value", function(d) {          return d.key;       })       .text(function(d) {          return d.key;       });    // menu   list.on('change', function() {       var selected = d3.select(this).select("select").property("value")       var cd = nested_data.filter(function(d) {            return (selected == d.key)       });    updatenested_data(cd)   });    // config   var canvas = d3.select('#explorers').data(nested_data)    // bind, enter, remove   function updatenested_data(nested_data) {        var country = canvas.selectall(".country")        var countryenter = country         .data(function(d) {            return d.values         })         .enter().append('div')         .attr('class', 'country')        countryenter         .append("p")         .attr('class', 'label')         .style('font-weight', 'bold')         .text(function(d) {             return d.key;         })        country.exit().remove();    };     //filter    var filter = nested_data.filter(function(d) {        return ("berkner island" == d.key)    });     // update   updatenested_data(filter)  });

there no problem anywhere except way entering , exiting:

function updatenested_data(cd) {       //set data selection       var country = canvas.selectall(".country").data(cd.values)        var countryenter = country            .enter().append('div')           .attr('class', 'country')        countryenter             .append("p")             .attr('class', 'label')             .style('font-weight', 'bold')             .text(function(d) {                 return d.key;             })       //exit on selection       country.exit().remove();    };

working code here


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