grdw/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <title>Date Of Birth</title>
    <script src="https://d3js.org/d3.v7.min.js"></script>
  </head>
  <body>
    <form>
      <label>Date of birth</label>
      <input value="0" id="day" disabled="disabled" maxlength="2" name="date-of-birth-day"/>
      <input value="0" id="month" disabled="disabled" maxlength="2" name="date-of-birth-month"/>
      <input value="0" id="year" disabled="disabled" maxlength="4" name="date-of-birth-year"/>
    </form>
    <style>
      input { width: 20px; }
      input[name="date-of-birth-year"] { width: 40px; }
      body{ font-size: 1.2em; font-family: "Times new roman"; }
      form { margin-bottom: 12px; }
      rect.mine { fill: #FFCCCC; }
      rect.selected { fill: #CCFFCC; }
      text { text-anchor: middle; }
    </style>
    <svg id="svg" xmlns="http://www.w3.org/2000/svg" width="600" height="600">
    </svg>
    <script>
      const svg = document.getElementById("svg");
      const day = document.getElementById("day");
      const month = document.getElementById("month");
      const year = document.getElementById("year");
      const size = 50;
      const mazeWidth = 12;
      const colors = ["#d8140e", "#d84f0e", "#6da016"];
      const colorIndexes = ["year", "month", "day"];

      let yearValue = ["0", "0", "0", "0"];
      let yearIndex = 0;
      let active = false;
      let data = [
          { value: "1", display: "Jan", input: "month" },
          { value: "2", display: "Feb", input: "month" },
          { value: "3", display: "Mar", input: "month" },
          { value: "4", display: "Apr", input: "month" },
          { value: "5", display: "May", input: "month" },
          { value: "6", display: "Jun", input: "month" },
          { value: "7", display: "Jul", input: "month" },
          { value: "8", display: "Aug", input: "month" },
          { value: "9", display: "Sep", input: "month" },
          { value: "10", display: "Oct", input: "month" },
          { value: "11", display: "Nov", input: "month" },
          { value: "12", display: "Dec", input: "month" },
      ];

      for (let i = 1; i <= 31; i++) {
          data.push({
             value: i.toString(),
             display: i.toString(),
             input: "day"
          });
      }

      for (let i = 0; i <= 9; i++) {
          data.push({
             value: i.toString(),
             display: i.toString(),
             input: "year"
          });
      }

      const blanks = (mazeWidth * mazeWidth) - data.length;
      for (let i = 0; i < blanks ; i++) {
          data.push({
              value: 0,
              display: "",
              input: null
          });
      }


      function reposition() {
          for (const i in data) {
              data[i].x = (i % mazeWidth) * size;
              data[i].y = Math.floor(i / mazeWidth) * size;
          }
      }

      d3.shuffle(data);
      reposition();
      d3.shuffle(colorIndexes);

      d3.selectAll("input").style("color", function() {
          return colors[colorIndexes.indexOf(this.id)]
      });

      const groups = d3.select("svg")
        .selectAll("g")
        .data(data)
        .enter()
        .append("g")
        .attr("data-input", function(d) { return d.input; })
        .attr("data-value", function(d) { return d.value; })
        .attr("transform", function(d, i) {
            return "translate(" + d.x + "," +  d.y + ")"
        })
        .on("mouseenter", onMouseEnter);

      groups
        .append("rect")
        .attr("width", size)
        .attr("height", size)
        .attr("fill", "#EEE")
        .attr("stroke", "#DDD");

      groups
        .append("text")
        .attr("dy", "1.6em")
        .attr("dx", "1.3em")
        .attr('fill', function(d) {
            return colors[colorIndexes.indexOf(d.input)];
        })
        .text(function(d) { return d.display });


      function onMouseEnter(evt) {
          const d = this.dataset;

          if (d.input !== undefined) {
              const r = d3.select(this).select("rect");
              const c = r.attr("class");

              if (c == "mine") {
                  cancel();
                  return;
              }

              switch(d.input) {
                  case "year":
                  yearValue[yearIndex % yearValue.length] = d.value;
                  yearIndex += 1;
                  year.value = yearValue.join("");
                  break;

                  default:
                  document.getElementById(d.input).value = d.value;
                  d3
                    .selectAll("g[data-input=\"" + d.input + "\"] rect")
                    .attr("class", "mine");
                  break;
              }

              r.attr("class", "selected");
          }
      }

      function cancel() {
          year.value = day.value = month.value = "0";
          groups.on("mouseenter", null);

          d3.shuffle(data);
          d3.shuffle(colorIndexes);
          d3.select("svg")
            .selectAll("g")
            .data(data)
            .join("g")
            .transition()
            .duration(1000)
            .attr("transform", function(d, i) {
                return "translate(" + d.x + "," + d.y + ")"
            })
            .on("end", function() {
                groups.on("mouseenter", onMouseEnter);
            });

          d3.selectAll("input").style("color", function() {
              return colors[colorIndexes.indexOf(this.id)]
          });
          d3.selectAll("g text").attr("fill", function () {
              return colors[colorIndexes.indexOf(this.parentNode.dataset.input)];
          });

          d3.selectAll("g rect").attr("class", "");
      }

      function confirmDate() {
          svg.removeEventListener("mouseleave", cancel, false);
          groups.on("mouseenter", null);
          d3.selectAll("g rect.mine").attr("class", "");
      }

      svg.addEventListener("mouseleave", cancel, false);
      svg.addEventListener("click", confirmDate, false);
    </script>
  </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Date Of Birth</title>
	<script src="https://d3js.org/d3.v7.min.js"></script>
	</head>
	<body>
	<form>
	<label>Date of birth</label>
	<input value="0" id="day" disabled="disabled" maxlength="2" name="date-of-birth-day"/>
	<input value="0" id="month" disabled="disabled" maxlength="2" name="date-of-birth-month"/>
	<input value="0" id="year" disabled="disabled" maxlength="4" name="date-of-birth-year"/>
	</form>
	<style>
	input { width: 20px; }
	input[name="date-of-birth-year"] { width: 40px; }
	body{ font-size: 1.2em; font-family: "Times new roman"; }
	form { margin-bottom: 12px; }
	rect.mine { fill: #FFCCCC; }
	rect.selected { fill: #CCFFCC; }
	text { text-anchor: middle; }
	</style>
	<svg id="svg" xmlns="http://www.w3.org/2000/svg" width="600" height="600">
	</svg>
	<script>
	const svg = document.getElementById("svg");
	const day = document.getElementById("day");
	const month = document.getElementById("month");
	const year = document.getElementById("year");
	const size = 50;
	const mazeWidth = 12;
	const colors = ["#d8140e", "#d84f0e", "#6da016"];
	const colorIndexes = ["year", "month", "day"];

	let yearValue = ["0", "0", "0", "0"];
	let yearIndex = 0;
	let active = false;
	let data = [
	{ value: "1", display: "Jan", input: "month" },
	{ value: "2", display: "Feb", input: "month" },
	{ value: "3", display: "Mar", input: "month" },
	{ value: "4", display: "Apr", input: "month" },
	{ value: "5", display: "May", input: "month" },
	{ value: "6", display: "Jun", input: "month" },
	{ value: "7", display: "Jul", input: "month" },
	{ value: "8", display: "Aug", input: "month" },
	{ value: "9", display: "Sep", input: "month" },
	{ value: "10", display: "Oct", input: "month" },
	{ value: "11", display: "Nov", input: "month" },
	{ value: "12", display: "Dec", input: "month" },
	];

	for (let i = 1; i <= 31; i++) {
	data.push({
	value: i.toString(),
	display: i.toString(),
	input: "day"
	});
	}

	for (let i = 0; i <= 9; i++) {
	data.push({
	value: i.toString(),
	display: i.toString(),
	input: "year"
	});
	}

	const blanks = (mazeWidth * mazeWidth) - data.length;
	for (let i = 0; i < blanks ; i++) {
	data.push({
	value: 0,
	display: "",
	input: null
	});
	}


	function reposition() {
	for (const i in data) {
	data[i].x = (i % mazeWidth) * size;
	data[i].y = Math.floor(i / mazeWidth) * size;
	}
	}

	d3.shuffle(data);
	reposition();
	d3.shuffle(colorIndexes);

	d3.selectAll("input").style("color", function() {
	return colors[colorIndexes.indexOf(this.id)]
	});

	const groups = d3.select("svg")
	.selectAll("g")
	.data(data)
	.enter()
	.append("g")
	.attr("data-input", function(d) { return d.input; })
	.attr("data-value", function(d) { return d.value; })
	.attr("transform", function(d, i) {
	return "translate(" + d.x + "," + d.y + ")"
	})
	.on("mouseenter", onMouseEnter);

	groups
	.append("rect")
	.attr("width", size)
	.attr("height", size)
	.attr("fill", "#EEE")
	.attr("stroke", "#DDD");

	groups
	.append("text")
	.attr("dy", "1.6em")
	.attr("dx", "1.3em")
	.attr('fill', function(d) {
	return colors[colorIndexes.indexOf(d.input)];
	})
	.text(function(d) { return d.display });


	function onMouseEnter(evt) {
	const d = this.dataset;

	if (d.input !== undefined) {
	const r = d3.select(this).select("rect");
	const c = r.attr("class");

	if (c == "mine") {
	cancel();
	return;
	}

	switch(d.input) {
	case "year":
	yearValue[yearIndex % yearValue.length] = d.value;
	yearIndex += 1;
	year.value = yearValue.join("");
	break;

	default:
	document.getElementById(d.input).value = d.value;
	d3
	.selectAll("g[data-input=\"" + d.input + "\"] rect")
	.attr("class", "mine");
	break;
	}

	r.attr("class", "selected");
	}
	}

	function cancel() {
	year.value = day.value = month.value = "0";
	groups.on("mouseenter", null);

	d3.shuffle(data);
	d3.shuffle(colorIndexes);
	d3.select("svg")
	.selectAll("g")
	.data(data)
	.join("g")
	.transition()
	.duration(1000)
	.attr("transform", function(d, i) {
	return "translate(" + d.x + "," + d.y + ")"
	})
	.on("end", function() {
	groups.on("mouseenter", onMouseEnter);
	});

	d3.selectAll("input").style("color", function() {
	return colors[colorIndexes.indexOf(this.id)]
	});
	d3.selectAll("g text").attr("fill", function () {
	return colors[colorIndexes.indexOf(this.parentNode.dataset.input)];
	});

	d3.selectAll("g rect").attr("class", "");
	}

	function confirmDate() {
	svg.removeEventListener("mouseleave", cancel, false);
	groups.on("mouseenter", null);
	d3.selectAll("g rect.mine").attr("class", "");
	}

	svg.addEventListener("mouseleave", cancel, false);
	svg.addEventListener("click", confirmDate, false);
	</script>
	</body>
	</html>