I am trying to reference a canvas DOM element to make the width of it the same as its parent without messing with the scale of the canvas. When doing so I am getting a Uncaught TypeError: _canvasRef$current.getContext is not a function error and am not exactly sure how to fix it.
Ive console logged a few things just to make the app run but the issue is within the useEffect
import SignaturePad from 'react-signature-canvas'
const canvasRef = useRef<HTMLCanvasElement>(null)
useEffect(() => {
const ctx: CanvasRenderingContext2D | null | undefined =
canvasRef.current?.getContext('2d')
const ctxContainer = document.getElementById('ctxContainer')
console.log('ctx: ', ctx)
// if (ctx && ctxContainer) {
// ctx.style.width = '100%'
// ctx.style.height = '100%'
// ctx.width = ctxContainer.clientWidth
// }
}, [])
const save = () => {
console.log('saved!')
}
console.log('canvasRef: ', canvasRef)
return (
<div id={`ctxContainer`} className={'signatureInput__option-draw'}>
<SignaturePad
ref={canvasRef}
canvasProps={{
className: 'signatureInput__option-draw__canvas',
}}
onEnd={save}
/>
</div>
)
Try this.
Note that you may still need to do some changes to following code to full fill your full requirement ( such as event handling when the user change the screen sizes. ) The following code will fix the issue you are facing right now.
useEffect(() => {
if (canvasRef.current) {
const canvas = canvasRef.current.getCanvas();
const ctx = canvas.getContext('2d');
// do something with the canvas ref
if (ctx) {
ctx.canvas.width = window.innerHeight;
ctx.canvas.height = window.innerHeight;
}
}
}, []);
Try using getCanvas() . i dont think getContext() is provided with the package
function App() {
const canvasRef = React.createRef(null);
useEffect(() => {
const canvas = canvasRef.current;
console.log(canvas.current);
const ctx = canvas.getCanvas();
const ctxContainer = document.getElementById("ctxContainer");
console.log("ctx: ", ctx);
if (ctx && ctxContainer) {
ctx.style.width = "100%";
ctx.style.height = "100%";
ctx.width = ctxContainer.clientWidth;
}
}, []);
const save = () => {
console.log("saved!");
};
console.log("canvasRef: ", canvasRef);
return (
<div className="App">
<div id={`ctxContainer`} className={"signatureInput__option-draw"}>
<SignaturePad
ref={(ref) => {
canvasRef.current = ref;
}}
canvasProps={{
className: "signatureInput__option-draw__canvas",
}}
onEnd={save}
/>
</div>
</div>
);
}