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<html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Keywords" name="Keywords"content="JavaScript, examples, JavaScript: The Definitive Guide"><title>Example 22-5 from JavaScript: The Definitive Guide, Fifth Edition</title><style>body { font-family: arial, sans-serif}.lefttitle { font: bold x-small arial, sans-serif; margin: 5px; letter-spacing: .15em; text-transform:uppercase;}.leftcaption { font: italic x-small sans-serif; margin-bottom: 20px;}#banner { font-family:sans-serif; color:#333; font-size:x-large; font-weight:normal; padding:15px; padding-top: 3px; border-bottom:4px double #666;}#banner h1 { font-size: x-large; margin: 0px; padding: 0px;}#banner .description { font-size:large; margin-left: 2px;}pre { border: solid black 1px; background-color: #ddd; padding: 10px; margin: 0px;} </style></script></head><body><div id="banner"><h1>davidflanagan.com/javascript5</h1><span class="description">Example 22-5 from<i>JavaScript: The Definitive Guide, Fifth Edition</i></span></div><div style="float: left; 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text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre>/** * BarChart.js: * This file defines makeBarChart(), a function that creates a bar chart to * display the numbers from the data[] array. The overall size of the chart * is specified by the optional width and height arguments, which include the * space required for the chart borders and internal padding. The optional * barcolor argument specifies the color of the bars. The function returns the * <div> element it creates, so the caller can further manipulate it by * setting a margin size, for example. The caller must insert the returned * element into the document in order to make the chart visible. **/function makeBarChart(data, width, height, barcolor) { // Provide default values for the optional arguments if (!width) width = 500; if (!height) height = 350; if (!barcolor) barcolor = "blue"; // The width and height arguments specify the overall size of the // generated chart. We have to subtract the border and padding // sizes from this to get the size of the element we create. width -= 24; // Subtract 10px padding and 2px border left and right height -= 14; // Subtract 10px top padding and 2px top and bottom border // Now create an element to hold the chart. Note that we make the chart // relatively positioned so that can have absolutely positioned children, // but it still appears in the normal element flow. var chart = document.createElement("div"); chart.style.position = "relative"; // Set relative positioning chart.style.width = width + "px"; // Set the chart width chart.style.height = height + "px"; // Set the chart height chart.style.border = "solid black 2px"; // Give it a border chart.style.paddingLeft = "10px"; // Add padding on the left chart.style.paddingRight = "10px"; // and on the right chart.style.paddingTop = "10px"; // and on the top chart.style.paddingBottom = "0px"; // but not on the bottom chart.style.backgroundColor = "white"; // Make chart background white // Compute the width of each bar var barwidth = Math.floor(width/data.length); // Find largest number in data[]. Note clever use of Function.apply() var maxdata = Math.max.apply(this, data); // The scaling factor for the chart: scale*data[i] gives height of a bar var scale = height/maxdata; // Now loop through the data array and create a bar for each datum for(var i = 0; i < data.length; i++) { var bar = document.createElement("div"); // Create div for bar var barheight = data[i] * scale; // Compute height of bar bar.style.position = "absolute"; // Set bar position and size bar.style.left = (barwidth*i+1+10)+"px"; // Add bar border & chart pad bar.style.top = height-barheight+10+"px";// Add chart padding bar.style.width = (barwidth-2) + "px"; // -2 for the bar border bar.style.height = (barheight-1) + "px"; // -1 for the bar top border bar.style.border = "solid black 1px"; // Bar border style bar.style.backgroundColor = barcolor; // Bar color bar.style.fontSize = "0px"; // IE workaround chart.appendChild(bar); // Add bar to chart } // Finally, return the chart element so the caller can manipulate it return chart;}</pre><div class="lefttitle" style="padding:0px; text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><p><script type="text/javascript">amazon_ad_tag="davidflanagancom"; amazon_ad_width="300"; amazon_ad_height="250"; amazon_ad_logo="hide";</script><script type="text/javascript" src="../../www.assoc-amazon.com/s/ads.js" tppabs="http://www.assoc-amazon.com/s/ads.js"></script></div></body></html>?? 快捷鍵說明
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