vue3+ts怎么使用FileRead渲染pdf到页面中
时间: 2024-01-21 15:03:05 浏览: 34
要在Vue 3 + TypeScript中使用FileRead来渲染PDF文件,可以按照以下步骤进行操作:
1. 安装pdfjs-dist库:在终端中运行以下命令:
```
npm install --save pdfjs-dist
```
2. 在Vue组件中导入pdfjs-dist库:
```typescript
import * as pdfjsLib from 'pdfjs-dist';
```
3. 创建一个变量来存储PDF页面和总页数:
```typescript
currentPage: number = 1;
totalPages: number = 0;
```
4. 创建一个方法,用于加载PDF文件并渲染第一页:
```typescript
loadPdf(file: File) {
const fileReader = new FileReader();
fileReader.onload = () => {
const typedArray = new Uint8Array(fileReader.result as ArrayBuffer);
pdfjsLib.getDocument(typedArray).promise.then(pdf => {
this.totalPages = pdf.numPages;
pdf.getPage(1).then(page => {
const canvas = document.getElementById('pdf-canvas') as HTMLCanvasElement;
const context = canvas.getContext('2d') as CanvasRenderingContext2D;
const viewport = page.getViewport({scale: 1});
canvas.height = viewport.height;
canvas.width = viewport.width;
const renderContext = {
canvasContext: context,
viewport: viewport
};
page.render(renderContext).promise.then(() => {
console.log('Page rendered');
});
});
});
};
fileReader.readAsArrayBuffer(file);
}
```
5. 在模板中创建一个`<canvas>`元素,并调用`loadPdf`方法来加载PDF文件:
```html
<template>
<div>
<input type="file" @change="onFileChange">
<canvas id="pdf-canvas"></canvas>
</div>
</template>
<script lang="ts">
import { defineComponent } from 'vue';
import * as pdfjsLib from 'pdfjs-dist';
export default defineComponent({
name: 'PdfViewer',
data() {
return {
currentPage: 1,
totalPages: 0
};
},
methods: {
onFileChange(event: Event) {
const target = event.target as HTMLInputElement;
const file = target.files![0];
this.loadPdf(file);
},
loadPdf(file: File) {
const fileReader = new FileReader();
fileReader.onload = () => {
const typedArray = new Uint8Array(fileReader.result as ArrayBuffer);
pdfjsLib.getDocument(typedArray).promise.then(pdf => {
this.totalPages = pdf.numPages;
pdf.getPage(1).then(page => {
const canvas = document.getElementById('pdf-canvas') as HTMLCanvasElement;
const context = canvas.getContext('2d') as CanvasRenderingContext2D;
const viewport = page.getViewport({scale: 1});
canvas.height = viewport.height;
canvas.width = viewport.width;
const renderContext = {
canvasContext: context,
viewport: viewport
};
page.render(renderContext).promise.then(() => {
console.log('Page rendered');
});
});
});
};
fileReader.readAsArrayBuffer(file);
}
}
});
</script>
```
这样,当用户选择一个PDF文件后,它将被加载并呈现在`<canvas>`元素中的第一页。你可以通过修改`currentPage`的值来呈现其他页面。