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Can data keys for enter, update,exit in d3js be a list?


Can data keys for enter, update,exit in d3js be a list?

By : Daria Tereshkina
Date : November 22 2020, 11:17 AM
this will help The key for .data() is a function. This function tells D3 how to match data in the first argument to the data bound to existing elements. That is, if the key function returns the same value for an element in the first argument to .data() and the data bound to an existing DOM element, the DOM element is assumed to represent that data.
If the data element is matched, it will be in the update selection. If it is not matched, it will be in the enter selection. All existing DOM elements that are not matched by data will be in the exit selection.
code :


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D3js exit() and update working, can't enter()

D3js exit() and update working, can't enter()


By : 3degh
Date : March 29 2020, 07:55 AM
I hope this helps you . The problem with the code is, that you are trying to use an object as data. d3.selection.data() takes an array, not an object. See the d3 wiki for more information on the data() function.
I have created an updated version of your codepen. I changed the data to an array and applied the correct conventional margin. Moreover I simplified the code by removing the double initialization of scales and the svg element.
d3js enter().append after exit().remove()

d3js enter().append after exit().remove()


By : Geoff Franks
Date : March 29 2020, 07:55 AM
this one helps. I have a word cloud that can be filtered by date range and sentiment. Sometimes there will be more data sometimes there will be less. When I remove data, update the dom and then add data the elements that were removed won't come back. Using d3js version 3.4.13 , I'll first explain what's happening first...
code :
var width = 600, height = 200;
var words = ["Hello", "world", "Wonderful"];

var wcwords = d3.select("#wordcloud")
    .attr("width", width)
    .attr("height", height)
    .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
    .selectAll("text")
    .data(words);
    .enter()
    .append("text");  
wcwords
    .attr("transform", function(d,i) {
        return "translate(" + [5, 20*i] + ")";
    })
    .text(function(d) { return d; });

wcwords.data(words.slice(0,2)).exit().remove();  
wcwords.data(words.concat(["No"])).enter().append('text')
    .attr("transform", function(d,i) {
        return "translate(" + [5, 20*i] + ")";
    })
    .text(function(d) { return d; });  
var width = 70, height = 100;
    var words = ["Hello", "world", "Wonderful"];
    var outputLog = OutputLog("#output-log");
    var transitionLog = OutputLog("#transition-log");

    var wcwords = d3.select("#wordcloud").style("display", "inline-block")
        .attr("width", width)
        .attr("height", height)
        .append("g")
        .style("font-size", "10px")
        .attr("transform", "translate(" + 10 + "," + 20 + ")")
        .selectAll("text")
        .data(words)
        .enter()
        .append("text")
        .style("opacity", 0);

    wcwords
        .text(function(d) { return d; })
        .attr("transform", function(d,i) {
            return "translate(" + [5, 20*i] + ")";
        })
        .call(step, 0, "in")
        .call(log, "wcwords.data(words) enter");

    // bind a new data set to the selection and return the update selection
    var wcwords = wcwords.data(words.slice(0,2))
        .call(log, "wcwords.data(words.slice(0,2)) update");

    // merge the enter selection into the update selection and update the DOM
    wcwords.enter()
        .append("text")
        .style("opacity", 0);
    wcwords.exit().transition().call(step, 1, "out").remove()
        .call(log, "exit");

    // modify the selection by rebinding the original data
    // but with an extra element concatenated
    // and return the update selection
    var wcwords = wcwords.data(words.concat(["No"]))
        .call(log, "wcwords.data(words.concat(['No'])) update");

    // update the DOM and merge the exit selection into the update selection
    wcwords.enter().append('text')
        .attr("transform", function(d,i) {
            return "translate(" + [5, 20*i] + ")";
        })
        .text(function(d) { return d; })
        .style("opacity", 0)
        .call(step, 2, "in")
        .call(log, "enter");

    function datum(n){
        return n ? d3.select(n).datum() : "";
    }
    function step (selection, s, type) {
        var id = Date.now(),
            opacity = {in: 1, out: 0},
            t = 1000,
            w = 0, b = "";
        selection.each(function(d){w = Math.max(w, d.length) });
        b = new Array(w+4).join('_')
        this.transition(Date.now()).delay(s * t).duration(t)
            .each("start." + id, function(d, i, j){
                var n = this, node = d3.select(n),
                    DOM_node = d3.select(selection[0].parentNode)
                    .selectAll(this.nodeName).filter(function(d){return node.datum() === d});
                DOM_node = DOM_node.length ? DOM_node[0][0] : null;
                transitionLog.writeLine(["start ", (""+id).slice(-4), s, type, (d+b).slice(0,w), style(this, "opacity") || "null", DOM_node === n].join("\t"))
            })
            .each("interrupt." + id, function(d){
                console.log(["\tinterrupt ", id, type, style(this, "opacity"), s].join("\t"))
            })
            .each("end." + id, function(d){
                var n = this, node = d3.select(n),
                    DOM_node = d3.select(selection[0].parentNode)
                        .selectAll(this.nodeName).filter(function(d){return node.datum() === d});
                DOM_node = DOM_node.length ? DOM_node[0][0] : null;
                transitionLog.writeLine(["end", (""+id).slice(-4), s, type, (d+b).slice(0,w), style(this, "opacity") || "null", DOM_node === n].join("\t"))
            })
            .style("opacity", opacity[type]);
        function style(n, a){return d3.select(n).style(a)}
    }

    function log(selection, title){
        outputLog.writeLine(title);
        outputLog.writeLine(this[0].map(datum), 1);
    }

    function OutputLog(selector) {
        var outputLog = d3.select(selector)
            .style({
                "display"    : "inline-block",
                "font-size"  : "10px",
                "margin-left": "10px",
                padding      : "1em",
                "white-space": "pre",
                "background" : "#fd9801",
            });
        outputLog.writeLine = (function() {
            var s = "";
            return function(l, indent) {
                this.text((s += ((indent ? "  " : "") + l + "\n")));
            }
        })();
        return outputLog
    }
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="UTF-8"></script>
<svg id='wordcloud'></svg>
<div id="output-log"></div>
<div id="transition-log"></div>
D3js path update enter and exit

D3js path update enter and exit


By : Moody Hussein
Date : March 29 2020, 07:55 AM
wish helps you The enter() and exit() selections are created after D3 compares your selection with the data provided. So they are available in the return of these calls:
code :
this.group.selectAll("path")
            .data(this.data[this.site].drawLine)
    let update = this.group.selectAll("path")
        .data(this.data[this.site].drawLine)

    update.enter()
        .append("path")
        .attr("d", line)
        .attr("fill", "none")
        .attr("stroke", "black")

    update.exit()
        .remove()
Update data in D3 v4 using enter and exit not working

Update data in D3 v4 using enter and exit not working


By : Kirk Karavouzis
Date : March 29 2020, 07:55 AM
This might help you Very simple example that draw texts in x ,y positions. But when I change the data and redraw with new data nothing happens. , jsfiddle.net/kds6wkh0
The update selection:
code :
let dot = svg
        .selectAll('.dot')
    .data(data,d=>d.id)
  dot.select('circle')
    .attr('cx', d => SCALES.x(d.x))
    .attr('cy', d => SCALES.y(d.y))
    dot.select('text')
    .attr('x', d => SCALES.x(d.x))
    .attr('y', d => SCALES.y(d.y))
d3js enter, update, exit confusion: need assistance please

d3js enter, update, exit confusion: need assistance please


By : user2205590
Date : March 29 2020, 07:55 AM
this one helps. The issue is in your method chaining.
On first run, things should run as expected:
code :
// create heatmap
svg.selectAll('g')  // 1. select all g elements
 .data(data)        // 2. assign data
 .enter()           // 3. enter and append a g for each item in the data array 
 .append('g')       //    that doesn't have a corresponding element in the DOM (or more accurately, the selection)                     
 .selectAll('rect') // 4. For each newly entered g, select child rectangles
 .data(function(d, i, j) { // 5. assign data to child selection.
    return d;
 })
 .enter()            // 6. Enter and append a rect for each item in the child g's data array 
 .append("rect")     //    that doesn't have a corresponding element in the DOM.
 ....                // 7. Style
var rows = svg.selectAll("g")
    .data(data);

// enter new rows where needed
rows.enter().append("g")

// Select all rects
var rects = rows.selectAll("rect")
  .data(function(d) { return d; })

// Enter new rects:
rects.enter().append("rect")

// Update rects (all rects, not just the newly entered):
rects.attr()...
var button = d3.select("button")
  .on("click", function() {
    update(random());
  })
  
var svg = d3.select("div")
  .append("svg");
  
var color = d3.scale.linear()
  .domain([0,0.5,1])
  .range(["red","orange","yellow"])
  
update(random());

function update(data) {
    var rows = svg.selectAll("g")
        .data(data);
 
    // enter new rows where needed
    rows.enter()
      .append("g")
      .attr("transform", function(d,i) {
        return "translate("+[0,i*22]+")";
      })
       
    // Select all rects:
    var rects = rows.selectAll("rect")
      .data(function(d) { return d; })

    // Enter new rects:
    rects.enter().append("rect")

    // Update rects:
    rects.attr("fill", function(d) {
        return color(d);
      })
      .attr("x", function(d,i) { return i*22; })
      .attr("width", 20)
      .attr("height", 20);
 
 
    console.log("entered rows:" + rows.enter().size());
    console.log("entered rects:" + rects.enter().size());

}

function random() {
  return d3.range(5).map(function() {
    return d3.range(5).map(function() {
      return Math.random();
    })
 })
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
<button>Update</button>
<div></div>
var button = d3.select("button")
  .on("click", function() {
    update(random());
  })
  
var svg = d3.select("div")
  .append("svg");
  
var color = d3.scaleLinear()
  .domain([0,0.5,1])
  .range(["red","orange","yellow"])
  
update(random());

function update(data) {
    var rows = svg.selectAll("g")
        .data(data);
 
    // enter new rows where needed
    rows = rows.enter()
      .append("g")
      .merge(rows)  // merge with existing rows
      .attr("transform", function(d,i) {
        return "translate("+[0,i*22]+")";
      })

    // Select all rects:
    var rects = rows.selectAll("rect")
      .data(function(d) { return d; })

    // Enter new rects:
    rects = rects.enter().append("rect")
      .merge(rects);

    // Update rects:
    rects.attr("fill", function(d) {
        return color(d);
      })
      .attr("x", function(d,i) { return i*22; })
      .attr("width", 20)
      .attr("height", 20);
 
}

function random() {
  return d3.range(5).map(function() {
    return d3.range(5).map(function() {
      return Math.random();
    })
 })
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<button>Update</button>
<div></div>
var csv = "'3, 6, 0, 8'\n'1, 9, 0, 4'\n'3, 0, 1, 8'\n'4, 0, 2, 7";
csv = csv.replace(/'/g,'');

var button = d3.select('button')
    .on('click', function() {
        createHeatmap(update());
    });

var w = 120;
var h = 120;
var intensity = 10;
var margin = {
    top: 25,
    right: 25,
    bottom: 25,
    left: 25
};

var svg = d3.select('#heatmap')
    .append('svg')
    .attr('width', w + margin.left + margin.right)
    .attr('height', h + margin.top + margin.bottom)
    .append('g')
    .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');

createHeatmap(csv); 

function createHeatmap(csv) {
    console.log(csv);
    var data = d3.csv.parseRows(csv).map(function(row) {
        return row.map(function(d) {
            return +d;
        });
    });

    var min = 0;
    var max = d3.max(data, function(d, i) {
        return i + 1;
    });
    var rectSize = 30;

    // define a colorScale with domain and color range
    var colorScale = d3.scale.linear()
        .domain([0,0.5,1])
        .range(['red', 'green', 'blue']);

    // append group of svg elements bound to data
    var rows = svg.selectAll('g')
        .data(data);

    // enter new rows where needed
    rows.enter().append('g');

    // select all rects
    var rects = rows.selectAll('rect')
        .data(function(d, i, j) {
            return d;
        });

    // enter new rects:
    rects.enter().append('rect');
    
    // CHANGES HERE:
    // Broke chain so that update actions aren't carried out on the enter selection:
    rects.attr('x', function(d, i, j) {
            return (i * rectSize);
        })
        .attr('y', function(d, i, j) {
            return (j * rectSize);
        })
        .attr('width', w / max)
        .attr('height', h / max)
        .style('fill', function(d, i, j) {
            return colorScale(d * intensity);
        });
}

function update() {
    var data = "'0, 1, 9, 5'\n'4, 0, 7, 2'\n'6, 3, 0, 8'\n'5, 3, 7, 0";
    data = data.replace(/'/g,'');
    return data;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
<button>Update</button>
<div id="heatmap"></div>
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