在本教程中，我們將學習如何使用 FabricJS 來取得目前實例所基於的映像元素。我們可以透過建立fabric.Image的實例來建立一個Image物件。由於它是 FabricJS 的基本元素之一，我們也可以透過應用角度、不透明度等屬性輕鬆自訂它。為了取得目前實例所基於的圖像元素，我們使用 getElement 方法。
getElement(): HTMLImageElement
在這個例子中，我們使用了getElement方法來取得目前實例所基於的圖像元素。您可以從開發工具開啟控制台來查看傳回的 HTML 圖像元素。
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>Using the getElement method</h2>
<p>You can open the console from dev tools to see the logged output</p>
<canvas id="canvas"></canvas>
<img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" />
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating the image element
var imageElement = document.getElementById("img1");
// Initiate an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
skewX: 15,
});
// Add it to the canvas
canvas.add(image);
// Using the getElement method
console.log(
"The image element on which the current instance is based on is as follows: ",
image.getElement()
);
</script>
</body>
</html>
讓我們看一下當 getElement 方法與 fromURL 方法結合使用時記錄的輸出的程式碼範例。在這裡，我們將能夠看到控制台中返回的圖像元素。
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>Using the getElement method along with fromURL method</h2>
<p>You can open the console from dev tools to see the logged output</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Using fromURL method
fabric.Image.fromURL(
"https://www.tutorialspoint.com/images/logo.png",
function (Img) {
canvas.add(Img);
console.log(
"The image element on which the current instance is based on is as follows: ",
Img.getElement()
);
}
);
</script>
</body>
</html>
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