我正在尝试通过向为列绘制的SVG rects添加渐变来向Google ColumnChart添加一些pizazz。下面的代码会为iframe svg＆gt; defs添加渐变，并在我关注的所有浏览器（Firefox，IE和Chrome的更高版本）中正确替换rects的fill属性。
我的问题是，无论何时将鼠标悬停在上面或选择一个条形图（或图例），颜色都会重置为原始颜色。我是一个SVG菜鸟，我无法弄清楚重置颜色的方式，位置或内容。
所以我的问题是有没有人知道如何（使用javascript / jquery）停止，覆盖或某种方式操纵重置颜色的代码？如果可能的话，我宁愿保持“互动”部分的完整性（工具提示等）。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Google Visualization API Sample</title>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load('visualization', '1', {packages: ['corechart']});
google.load("jquery", "1.7.1");
</script>
<script type="text/javascript">
function drawVisualization() {
// Create and populate the data table.
var data = new google.visualization.DataTable();
var rowData = [['Year', 'North', 'West', 'South'],
['2010', 197, 333, 298 ],
['2011', 167, 261, 381 ]];
var data = google.visualization.arrayToDataTable(rowData);
visualization = new google.visualization.ColumnChart(document.getElementById('visualization'));
google.visualization.events.addListener(visualization, 'ready', function(){
var svgns = "http://www.w3.org/2000/svg";
var gradients = [["red","#C0504D","#E6B8B7"],
["green","#9BBB59","#D8E4BC"],
["blue","#4F81BD","DCE6F1"]];
var svg_defs = $("#visualization iframe").contents().find('defs');
// add gradients to svg defs
for(var i = 0; i < gradients.length; i++){
var grad = $(document.createElementNS(svgns, "linearGradient")).
attr({id:gradients[i][0],x1:"0%",x2:"0%",y1:"0%",y2:"100%"});
var stopTop = $(document.createElementNS(svgns, "stop")).
attr({offset:"0%","stop-color":gradients[i][1]});
var stopBottom = $(document.createElementNS(svgns, "stop")).
attr({offset:"100%","stop-color":gradients[i][2]});
$(grad).append(stopTop).append(stopBottom);
svg_defs.append(grad);
}
// #3366cc, #dc3912, #ff9900 - replace default colors with gradients
$("#visualization iframe").contents().find('rect[fill="#3366cc"]').attr({'fill':'url(#blue)','stroke-width':0.4,'stroke':'#000000'});
$("#visualization iframe").contents().find('rect[fill="#dc3912"]').attr({'fill':'url(#blue)','stroke-width':0.4,'stroke':'#000000'});
$("#visualization iframe").contents().find('rect[fill="#ff9900"]').attr({'fill':'url(#blue)','stroke-width':0.4,'stroke':'#000000'});
});
// Create and draw the visualization.
visualization.draw(data,{width:600, height:400});
}
google.setOnLoadCallback(drawVisualization);
</script>
</head>
<body style="font-family: Arial;border: 0 none;">
<div id="visualization" style="width: 600px; height: 400px;"></div>
</body>
</html>
更新
因此，在查看DOM以查看是否可以找到这些颜色代码可能存储的位置（并通过查找使用它们的函数）时，我确实找到了这些（设置时将执行我想要的操作）：
//fill
visualization.qa.l.e[0].Hm.O = "url(#blue)";
visualization.qa.l.e[1].Hm.O = "url(#red)";
visualization.qa.l.e[2].Hm.O = "url(#green)";
// stroke
visualization.qa.l.e[0].Hm.Jb = "#000000";
visualization.qa.l.e[1].Hm.Jb = "#000000";
visualization.qa.l.e[2].Hm.Jb = "#000000";
// fill-opacity
//visualization.qa.l.e[0].Hm.$b = 0.5;
//visualization.qa.l.e[1].Hm.$b = 0.5;
//visualization.qa.l.e[2].Hm.$b = 0.5;
// stroke-width
visualization.qa.l.e[0].Hm.H = 0.4;
visualization.qa.l.e[1].Hm.H = 0.4;
visualization.qa.l.e[2].Hm.H = 0.4;
// stroke-opacity
//visualization.qa.l.e[0].Hm.nc = 0.5;
//visualization.qa.l.e[1].Hm.nc = 0.5;
//visualization.qa.l.e[2].Hm.nc = 0.5;
但这只是一个临时解决方案，因为我确信下次Google更新可视化代码时，这些变量名称会发生变化（我不认为有人会故意选择这些并且使用的压缩器/混淆器可能会选择下次不同的变量名称 - 但后来谁知道 - 也许它不会。）
因此，如果有人知道一种不依赖于手动查找和设置变量名称的更永久的方式，我会喜欢它。否则，这可能是我现在最好的选择。
UPDATE2 （2012年3月1日）
例证。现在移动了变量：
//fill
visualization.da.C.d[0].en.S = "url(#blue)";
答案 0 :(得分：0)
您可以使用MutationObserver了解何时对svg进行了更改
将代码从'ready'事件监听器移至observer
覆盖重置颜色的代码
如下面的摘录...
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Google Visualization API Sample</title>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load('visualization', '1', {packages: ['corechart']});
google.load("jquery", "1.7.1");
</script>
<script type="text/javascript">
function drawVisualization() {
// Create and populate the data table.
var data = new google.visualization.DataTable();
var rowData = [['Year', 'North', 'West', 'South'],
['2010', 197, 333, 298 ],
['2011', 167, 261, 381 ]];
var data = google.visualization.arrayToDataTable(rowData);
var chartDiv = document.getElementById('visualization');
visualization = new google.visualization.ColumnChart();
// observe changes to the chart container
var observer = new MutationObserver(function () {
var svgns = "http://www.w3.org/2000/svg";
var gradients = [["red","#C0504D","#E6B8B7"],
["green","#9BBB59","#D8E4BC"],
["blue","#4F81BD","DCE6F1"]];
var svg_defs = $("#visualization iframe").contents().find('defs');
// add gradients to svg defs
for(var i = 0; i < gradients.length; i++){
var grad = $(document.createElementNS(svgns, "linearGradient")).
attr({id:gradients[i][0],x1:"0%",x2:"0%",y1:"0%",y2:"100%"});
var stopTop = $(document.createElementNS(svgns, "stop")).
attr({offset:"0%","stop-color":gradients[i][1]});
var stopBottom = $(document.createElementNS(svgns, "stop")).
attr({offset:"100%","stop-color":gradients[i][2]});
$(grad).append(stopTop).append(stopBottom);
svg_defs.append(grad);
}
// #3366cc, #dc3912, #ff9900 - replace default colors with gradients
$("#visualization iframe").contents().find('rect[fill="#3366cc"]').attr({'fill':'url(#blue)','stroke-width':0.4,'stroke':'#000000'});
$("#visualization iframe").contents().find('rect[fill="#dc3912"]').attr({'fill':'url(#blue)','stroke-width':0.4,'stroke':'#000000'});
$("#visualization iframe").contents().find('rect[fill="#ff9900"]').attr({'fill':'url(#blue)','stroke-width':0.4,'stroke':'#000000'});
});
observer.observe(chartDiv, {
childList: true,
subtree: true
});
// Create and draw the visualization.
visualization.draw(data,{width:600, height:400});
}
google.setOnLoadCallback(drawVisualization);
</script>
</head>
<body style="font-family: Arial;border: 0 none;">
<div id="visualization" style="width: 600px; height: 400px;"></div>
</body>
</html>