105 lines
3.4 KiB
TypeScript
105 lines
3.4 KiB
TypeScript
type FunctionReturn = {
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imageBase64?: string;
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imageBase64Full?: string;
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imageName?: string;
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};
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type Param = {
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imageInput: HTMLInputElement;
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maxWidth?: number;
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mimeType?: string;
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};
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/**
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* # Image Input Element to Base 64
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*/
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export default async function imageInputToBase64({
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imageInput,
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maxWidth,
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mimeType,
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}: Param): Promise<FunctionReturn> {
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/**
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* Make https request
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*
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* @description make a request to datasquirel.com
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*/
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try {
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let imagePreviewNode = document.querySelector(
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`[data-imagepreview='image']`
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);
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let imageName = imageInput.files?.[0].name.replace(/\..*/, "");
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let imageDataBase64: string | undefined;
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const MIME_TYPE = mimeType ? mimeType : "image/jpeg";
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const QUALITY = 0.95;
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const MAX_WIDTH = maxWidth ? maxWidth : null;
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const file = imageInput.files?.[0];
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const blobURL = file ? URL.createObjectURL(file) : undefined;
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const img = new Image();
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if (blobURL) {
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img.src = blobURL;
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imageDataBase64 = await new Promise((res, rej) => {
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/** ********************* Handle Errors in loading image */
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img.onerror = function () {
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URL.revokeObjectURL(this.src);
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window.alert("Cannot load image!");
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};
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img.onload = function (e) {
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const imgEl = e.target as HTMLImageElement;
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URL.revokeObjectURL(imgEl.src);
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const canvas = document.createElement("canvas");
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if (MAX_WIDTH) {
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const scaleSize = MAX_WIDTH / img.naturalWidth;
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canvas.width =
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img.naturalWidth < MAX_WIDTH
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? img.naturalWidth
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: MAX_WIDTH;
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canvas.height =
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img.naturalWidth < MAX_WIDTH
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? img.naturalHeight
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: img.naturalHeight * scaleSize;
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} else {
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canvas.width = img.naturalWidth;
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canvas.height = img.naturalHeight;
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}
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const ctx = canvas.getContext("2d");
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ctx?.drawImage(img, 0, 0, canvas.width, canvas.height);
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const srcEncoded = canvas.toDataURL(MIME_TYPE, QUALITY);
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if (imagePreviewNode) {
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document
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.querySelectorAll(`[data-imagepreview='image']`)
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.forEach((_img) => {
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const _imgEl = _img as HTMLImageElement;
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_imgEl.src = srcEncoded;
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});
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}
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res(srcEncoded);
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};
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});
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return {
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imageBase64: imageDataBase64?.replace(/.*?base64,/, ""),
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imageBase64Full: imageDataBase64,
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imageName: imageName,
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};
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} else {
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return {};
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}
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} catch (/** @type {*} */ error: any) {
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console.log("Image Processing Error! =>", error.message);
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return {};
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}
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}
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