This is the code for Chapter 8, Figure 11 from D3.js in Action that creates an image gallery with a zoom-to-image select input. This example uses D3 not only to create the image gallery made up of img elements but also the option elements that make the select input function.
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Ch. 8, Fig. 11 - D3.js in Action
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| <html> | |
| <head> | |
| <title>D3 in Action Chapter 8 - Example 9</title> | |
| <meta charset="utf-8" /> | |
| <script src="https://d3js.org/colorbrewer.v1.min.js" type="text/JavaScript"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| </head> | |
| <style> | |
| tr { | |
| border: 1px gray solid; | |
| } | |
| td { | |
| border: 2px black solid; | |
| } | |
| div.table { | |
| position:relative; | |
| } | |
| div.data { | |
| position: absolute; | |
| width: 90px; | |
| padding: 0 5px; | |
| } | |
| div.head { | |
| position: absolute; | |
| } | |
| div.datarow { | |
| position: absolute; | |
| width: 100%; | |
| border-top: 2px black solid; | |
| background: white; | |
| height: 35px; | |
| overflow: hidden; | |
| } | |
| div.gallery { | |
| position: relative; | |
| } | |
| img.infinite { | |
| position: absolute; | |
| background: rgba(255,255,255,0); | |
| border-width: 1px; | |
| border-style: solid; | |
| border-color: rgba(0,0,0,0); | |
| } | |
| </style> | |
| <body> | |
| <div id="traditional"> | |
| </div> | |
| </body> | |
| <footer> | |
| <script> | |
| imageArray = []; | |
| d3.select("#traditional").append("canvas").attr("height", 500).attr("width", 500); | |
| var context = d3.select("canvas").node().getContext("2d"); | |
| context.textAlign = "center"; | |
| context.font="200px Georgia"; | |
| colorScale = d3.scale.quantize().domain([0,1]).range(colorbrewer.Reds[7]); | |
| lineScale = d3.scale.quantize().domain([0,1]).range([10,40]); | |
| for (var x=0;x<100;x++) { | |
| context.clearRect(0,0,500,500); | |
| context.strokeStyle = colorScale(Math.random()); | |
| context.lineWidth = lineScale(Math.random()); | |
| context.fillStyle = colorScale(Math.random()); | |
| context.beginPath(); | |
| context.arc(250,250,200,0,2*Math.PI); | |
| context.fill(); | |
| context.stroke(); | |
| context.fillStyle = "black"; | |
| context.fillText(x,250,280); | |
| var dataURL = d3.select("canvas").node().toDataURL(); | |
| imageArray.push({x: x, url: dataURL}); | |
| } | |
| imgPerLine = 8; | |
| d3.select("canvas").remove(); | |
| d3.select("#traditional") | |
| .append("div").attr("class", "gallery") | |
| .selectAll("img").data(imageArray).enter().append("img") | |
| .attr("class", "infinite") | |
| .attr("src", function(d) {return d.url}) | |
| redrawGallery(); | |
| d3.selectAll("img") | |
| .on("mouseover", highlightImage) | |
| .on("mouseout", dehighlightImage) | |
| d3.select("div.gallery").style("height", "50%").style("overflow","scroll").style("border", "2px black solid") | |
| d3.select("#traditional").append("select") | |
| .on("change", zoomTo) | |
| .selectAll("option").data(d3.selectAll("img").data()).enter().append("option").attr("value", function(d) {return d.x}).html(function(d) {return "Image #" +d.x}) | |
| function redrawGallery() { | |
| var newWidth = parseFloat(d3.select("div.gallery").node().clientWidth); | |
| var imageSize = newWidth / imgPerLine; | |
| function imgX(x) { | |
| return Math.floor(x / imgPerLine) * imageSize; | |
| } | |
| function imgY(x) { | |
| return Math.floor(x%imgPerLine * imageSize) | |
| } | |
| d3.selectAll("img") | |
| .style("width", newWidth / imgPerLine) | |
| .style("top", function(d) {return imgX(d.x)}) | |
| .style("left", function(d) {return imgY(d.x)}) | |
| } | |
| function highlightImage(d) { | |
| var newWidth = parseFloat(d3.select("div.gallery").node().clientWidth); | |
| var imageSize = newWidth / 8; | |
| d3.select(this).transition().duration(500).style("width", imageSize * 2) | |
| .style("background", "rgba(255,255,255,1)") | |
| .style("border-color", "rgba(0,0,0,1)"); | |
| this.parentNode.appendChild(this) | |
| } | |
| function dehighlightImage(d) { | |
| var newWidth = parseFloat(d3.select("div.gallery").node().clientWidth); | |
| var imageSize = newWidth / 8; | |
| d3.select(this).transition().duration(500).style("width", imageSize) | |
| .style("background", "rgba(255,255,255,0)") | |
| .style("border-color", "rgba(0,0,0,0)") | |
| } | |
| function zoomTo() { | |
| var selectValue = d3.select("select").node().value; | |
| var newWidth = parseFloat(d3.select("div.gallery").node().clientWidth); | |
| var imageSize = newWidth / 8; | |
| var scrollTarget = Math.floor(selectValue / 8) * imageSize; | |
| d3.selectAll("img").filter(function(d) {return d.x == selectValue}) | |
| .transition().duration(2000).style("width", imageSize * 2) | |
| .style("background", "rgba(255,255,255,1)") | |
| .style("border-color", "rgba(0,0,0,1)"); | |
| var selectedNode = d3.selectAll("img") | |
| .filter(function(d) {return d.x == selectValue}).node(); | |
| selectedNode.parentNode.appendChild(selectedNode); | |
| d3.select("div.gallery").transition().duration(2000) | |
| .tween("scrollTween", scrollTopTween(scrollTarget)); | |
| function scrollTopTween(scrollTo) { | |
| return function() { | |
| var i = d3.interpolateNumber(this.scrollTop, scrollTo); | |
| return function(t) { this.scrollTop = i(t); }; | |
| }; | |
| } | |
| } | |
| window.onresize = function(event) { | |
| redrawGallery(); | |
| } | |
| </script> | |
| </footer> | |
| </html> |
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