我可以在 html 正文中成功运行，示例...
<div id="myContainer" style="float: left; background-color: Blue; height: 100px;
width: 100px;">
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%">
<defs>
<lineargradient id="myLinearGradient" x1="0%" x2="0%" y1="0%" y2="100%">
<stop id="start" offset="50%" style="stop-color: White; stop-opacity: 1" />
<stop id="stop" offset="60%" style="stop-color: #99cd9f; stop-opacity: 1" />
</lineargradient>
</defs>
<circle cx="50px" cy="50px" r="50px" fill="url(#myLinearGradient)" />
</svg>
</div>
但是，我需要使用 javascript 动态创建它。仅创建圆圈效果很好，当我将圆圈的 Fill 指向它失败的线性渐变时 - 我只得到一个黑色圆圈。
我认为我没有正确设置停止“样式”属性。我尝试了另一种方法无济于事，见下文......
我正在使用 Chrome，提前致谢!
在正文标签内:
<body>
<div style="float: left; background-color: Blue; height: 100px;
width: 100px;">
<svg id="Svg1" xmlns="http://www.w3.org/2000/svg">
<defs id="mydefs">
</defs>
</svg>
</div>
</body>
My script:
<script>
// lineargradient
var myLinearGradient = document.createElementNS("http://www.w3.org/2000/svg", "lineargradient");
myLinearGradient.setAttribute("id", "myLGID");
myLinearGradient.setAttribute("x1", "0%");
myLinearGradient.setAttribute("x2", "0%");
myLinearGradient.setAttribute("y1", "0%");
myLinearGradient.setAttribute("y2", "100%");
document.getElementById("mydefs").appendChild(myLinearGradient);
//stops
var stop1 = document.createElementNS("http://www.w3.org/2000/svg", "stop");
stop1.setAttribute("id", "myStop1");
stop1.setAttribute("offset", "70%");
//stop1.setAttribute("style", "stop-color: White; stop-opacity: 1");
stop1.setAttribute("stop-color", "White");
document.getElementById("mydefs").appendChild(stop1);
var stop2 = document.createElementNS("http://www.w3.org/2000/svg", "stop");
stop2.setAttribute("id", "myStop2");
stop2.setAttribute("offset", "80%");
//stop2.setAttribute("style", "stop-color: #99cd9f; stop-opacity: 1");
stop2.setAttribute("stop-color", "#99cd9f");
document.getElementById("mydefs").appendChild(stop2);
// Circle
var myCircle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
myCircle.setAttribute("id", "idCircle");
myCircle.setAttribute("cx", "50px");
myCircle.setAttribute("cy", "50px");
myCircle.setAttribute("r", "50px");
myCircle.setAttribute("fill", "url(#myLGID)");
document.getElementById("Svg1").appendChild(myCircle);
</script>
最佳答案
两件事:
- 线性渐变的元素名称是
linearGradient，而不是lineargradient。 - 您必须将停止点附加到
linearGradient元素，而不是defs元素。
查看此 codepen对于 MIT-licensed示例:
// Store the SVG namespace for easy reuse.
var svgns = 'http://www.w3.org/2000/svg';
// Create <svg>, <defs>, <linearGradient> and <rect> elements using createElementNS to apply the SVG namespace.
// (https://developer.mozilla.org/en-US/docs/Web/API/Document/createElementNS)
var svg = document.createElementNS(svgns, 'svg');
var defs = document.createElementNS(svgns, 'defs');
var gradient = document.createElementNS(svgns, 'linearGradient');
var rect = document.createElementNS(svgns, 'rect');
// Store an array of stop information for the <linearGradient>
var stops = [
{
"color": "#2121E5",
"offset": "0%"
},{
"color": "#206DFF",
"offset": "100%"
}
];
// Parses an array of stop information and appends <stop> elements to the <linearGradient>
for (var i = 0, length = stops.length; i < length; i++) {
// Create a <stop> element and set its offset based on the position of the for loop.
var stop = document.createElementNS(svgns, 'stop');
stop.setAttribute('offset', stops[i].offset);
stop.setAttribute('stop-color', stops[i].color);
// Add the stop to the <lineargradient> element.
gradient.appendChild(stop);
}
// Apply the <lineargradient> to <defs>
gradient.id = 'Gradient';
gradient.setAttribute('x1', '0');
gradient.setAttribute('x2', '0');
gradient.setAttribute('y1', '0');
gradient.setAttribute('y2', '1');
defs.appendChild(gradient);
// Setup the <rect> element.
rect.setAttribute('fill', 'url(#Gradient)');
rect.setAttribute('width', '100%');
rect.setAttribute('height', '100%');
// Assign an id, classname, width and height
svg.setAttribute('width', '100%');
svg.setAttribute('height', '100%')
svg.setAttribute('version', '1.1');
svg.setAttribute('xmlns', svgns);
// Add the <defs> and <rect> elements to <svg>
svg.appendChild(defs);
svg.appendChild(rect);
// Add the <svg> element to <body>
document.body.appendChild(svg);
关于javascript - 使用 JavaScript 时的动态 SVG 线性渐变，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13760299/