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21 <title>RGraph: HTML5 canvas graph library - Common issues</title>
23 <meta name="keywords" content="rgraph html5 canvas graph docs common issues" />
24 <meta name="description" content="RGraph: HTML5 canvas graph software - Documentation about common issues" />
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34 <script src="../libraries/RGraph.common.core.js" ></script>
37 function HideTwitterDIV ()
39 document.getElementById("twitter_div").style.opacity = 0;
40 document.getElementById("twitter_div").style.display = 'none';
44 function ShowTwitterDIV (e)
46 var e = RGraph.FixEventObject(document.all ? event : e);
47 var div = document.getElementById("twitter_div");
48 var img = document.getElementById("twitter_icon");
50 div.style.display = 'block';
51 div.style.left = (RGraph.getCanvasXY(img)[0] + img.offsetWidth - div.offsetWidth + 110) + 'px';
52 div.style.top = (RGraph.getCanvasXY(img)[1] - 1) + 'px';
57 setTimeout('document.getElementById("twitter_div").style.opacity = 0.2;', 25);
58 setTimeout('document.getElementById("twitter_div").style.opacity = 0.4;', 50);
59 setTimeout('document.getElementById("twitter_div").style.opacity = 0.6;', 100);
60 setTimeout('document.getElementById("twitter_div").style.opacity = 0.8;', 125);
61 setTimeout('document.getElementById("twitter_div").style.opacity = 1.0;', 150);
69 * This code installs the event handler that hides the Twitter DIV
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84 <div id="social_icons" class="warning" style="top: 0; left: 5px; position: absolute">
87 if (navigator.userAgent.indexOf('Opera') == -1) {
88 document.getElementById("social_icons").style.position = 'fixed';
89 document.getElementById("twitter_div").style.position = 'fixed';
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129 <div id="breadcrumb">
130 <a href="../index.html">RGraph: HTML5 canvas graph library</a>
132 <a href="index.html">Documentation</a>
137 <h1>RGraph: HTML5 canvas graph library - Common issues</h1>
140 if (RGraph.isIE8()) {
141 document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer 8 does not natively support the HTML5 canvas tag, so if you want to see the graphs, you can either:<ul><li>Install <a href="http://code.google.com/chrome/chromeframe/">Google Chrome Frame</a></li><li>Use ExCanvas. This is provided in the RGraph Archive.</li><li>Use another browser entirely. Your choices are Firefox 3.5+, Chrome 2+, Safari 4+ or Opera 10.5+. </li></ul> <b>Note:</b> Internet Explorer 9 fully supports the canvas tag. Click <a href="http://groups.google.com/group/rgraph/browse_thread/thread/c5651ff8c56b8f3c#" target="_blank">here</a> to see some screenshots.</div>');
145 <!-- Google Groups code -->
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149 <img src="../images/googlegroups.png" height="26" width="132" alt="Google Groups" />
154 <td style="padding-left: 5px">
155 <b>Subscribe to RGraph support</b>
160 <td style="padding-left: 5px;">
161 <form action="http://groups.google.com/group/rgraph/boxsubscribe" method="get">
162 Email: <input type=text name=email>
163 <input type=submit name="sub" value="Subscribe">
170 <a href="http://groups.google.com/group/rgraph/topics?gvc=2" target="_blank">Visit this group</a>
174 <!-- End of Google Groups code -->
177 These are some common issues that you should be aware of. If you're having trouble, you may want to look through these to see
178 if any apply to you or may be the source of your problem.
181 <a name="tooltips"></a>
182 <h4>Tooltips not working as of the October 2010 release</h4>
185 If you're specifying numbers instead of strings for your tooltips, they will not work any more. Simply cast them to
190 <span style="color: red">
191 // This WILL NOT work any more
192 myBar.Set('chart.tooltips', [56, 67, 53]);
194 <span style="color: green">
195 // Do any of these instead
196 myBar.Set('chart.tooltips', ['56', (67).toString(), String(53)]);</span>
199 <a name="annotations"></a>
200 <h4>Annotations aren't saved when running locally in Mozilla Firefox</h4>
203 The solution here is to run the graphs using a web server. At this time (March 2010) only Safari, Chrome and Opera
204 support saving annotations when running locally.
207 <a name="missing.text"></a>
208 <h4>Missing text in Google Chrome</h4>
211 Since one of the Chrome 4 dev releases there has been an issue with Google Chrome 4 and 5, asynchronous processing and not rendering
212 graph labels. This has been remedied by simply not using asynchronous processing. Because of the tag placement on the front page,
213 the effect shouldn't be apparent. Other browsers (eg Firefox, Safari, Opera, MSIE) are fine.
216 <a name="firefox.tooltips.clipboard"></a>
217 <h4>Firefox, tooltips and the clipboard</h4>
220 Firefox, tooltips and using the clipboard is a little convoluted. To copy the text in a tooltip you must do the following:
224 <li style="margin-top: 0">Select the text you want with the mouse.</li>
225 <li style="margin-top: 0">Press CTRL+C (it may be a different key combination if you're not using Windows) to copy the text to the clipboard.</li>
229 <b>Note:</b> Recent versions of Firefox 4 (from beta 6 onwards) appear to work as expected, and you can copy text with the mouse as normal.
232 <h4>Shadows in Google Chrome and the line chart</h4>
235 Shadows in recent versions of Google Chrome are somewhat broken. Firefox, MSIE, Opera and Safari are fine. The reason for this
236 error is a combination of factors it seems - shadow blurring and line width. Fixes have been added to allow shadow blurring and
237 a 1 pixel linewidth, though some graph types may still be affected.