web端实现过pdf在线批注(附源码)
时间: 2023-09-01 09:01:48 浏览: 234
要实现web端的PDF在线批注,以下是一个简单的示例源代码,可以作为参考:
HTML文件:
```html
<!DOCTYPE html>
<html>
<head>
<title>PDF在线批注</title>
<style>
#pdf-container {
width: 100%;
height: 500px;
}
</style>
</head>
<body>
<input type="file" id="pdf-file" accept=".pdf">
<div id="pdf-container"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.3.200/pdf.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(document).ready(function() {
$('#pdf-file').on('change', function() {
var file = this.files[0];
var fileReader = new FileReader();
fileReader.onload = function() {
var typedarray = new Uint8Array(this.result);
PDFJS.getDocument(typedarray).promise.then(function(pdf) {
for (var i = 1; i <= pdf.numPages; i++) {
pdf.getPage(i).then(function(page) {
var scale = 1.5;
var viewport = page.getViewport({ scale: scale });
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
canvas.height = viewport.height;
canvas.width = viewport.width;
var container = document.getElementById('pdf-container');
container.appendChild(canvas);
page.render({
canvasContext: context,
viewport: viewport
});
// 在这里可以添加批注功能
});
}
});
};
fileReader.readAsArrayBuffer(file);
});
});
</script>
</body>
</html>
```
这个示例使用了PDF.js库来在web页面中显示PDF文件。当用户选择一个PDF文件时,它使用FileReader API读取文件的内容,并将其转换为Uint8Array类型。然后,使用PDF.js库加载PDF文件,并将每一页渲染到一个Canvas元素中。你可以在页面上添加自定义批注功能。
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