Vue2或者uniapp 中 使用 iframe 嵌入本地 HTML 页面 并 相互通信。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<h3>iframe嵌入的页面</h3>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="google" content="notranslate">
<title>PDF.js viewer</title>
<!-- This snippet is used in production (included from viewer.html) -->
<link rel="resource" type="application/l10n" href="locale/">
<script src="../build/" type="module"></script>
<link rel="stylesheet" href="">
<!-- <script src="" type="module"></script> -->
<script type="module">
const queryString = document.location.search.substring(1);
function parseQueryString(query) {
const params = new Map();
for (const [key, value] of new URLSearchParams(query)) {
params.set(key.toLowerCase(), value);
}
return params;
}
// 当前页码和pdf地址通过链接传进来
const curParams = parseQueryString(queryString);
var url = curParams.get("file"); // pdf 地址
var {
pdfjsLib
} = globalThis;
pdfjsLib.GlobalWorkerOptions.workerSrc = '../build/';
var pdfDoc = null,
pageNum =Number(curParams.get("curpage"))|| 1, // 当前页码
pageTotal=null, // 总页码
pageRendering = false,
pageNumPending = null,
scale = 0.8,
canvas = document.getElementById('the-canvas'),
ctx = canvas.getContext('2d');
// iframe获取Vue传递过来的信息 拿到进度存储的页码
window.addEventListener("message", getVueMsg);
function getVueMsg(event){
const res = event.data;
if(res.cmd == 'myVue'){
pageNum=res.curPage;
console.log('iframe获取Vue传递过来的信息',res,res.curPage)
}
};
/**
* Get page info from document, resize canvas accordingly, and render page.
* @param num Page number.
*/
function renderPage(num) {
pageRendering = true;
// Using promise to fetch the page
pdfDoc.getPage(num).then(function(page) {
var viewport = page.getViewport({
scale: scale
});
canvas.height = viewport.height;
canvas.width = viewport.width;
// Render PDF page into canvas context
var renderContext = {
canvasContext: ctx,
viewport: viewport
};
var renderTask = page.render(renderContext);
// Wait for rendering to finish
renderTask.promise.then(function() {
pageRendering = false;
if (pageNumPending !== null) {
// New page rendering is pending
renderPage(pageNumPending);
pageNumPending = null;
}
});
});
// Update page counters
document.getElementById('page_num').textContent = num;
}
/**
* If another page rendering in progress, waits until the rendering is
* finised. Otherwise, executes rendering immediately.
*/
function queueRenderPage(num) {
if (pageRendering) {
pageNumPending = num;
} else {
renderPage(num);
}
iframeSendMsg(num,pageTotal); // 实时触发页码变化给 vue页面
}
/**
* Displays previous page. 上一页
*/
function onPrevPage() {
if (pageNum <= 1) {
return;
}
pageNum--;
queueRenderPage(pageNum);
}
document.getElementById('prev').addEventListener('click', onPrevPage);
/**
* Displays next page. 下一页
*/
function onNextPage() {
if (pageNum >= pdfDoc.numPages) {
return;
}
pageNum++;
queueRenderPage(pageNum);
}
document.getElementById('next').addEventListener('click', onNextPage);
/**
* Asynchronously downloads PDF. 初次加载
*/
pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) {
pdfDoc = pdfDoc_;
document.getElementById('page_count').textContent = pdfDoc.numPages;
pageTotal=pdfDoc.numPages;
// ('总页码',pageTotal)
iframeSendMsg(pageNum,pageTotal) // 初次加载后向cue页面传递 页码
// Initial/first page rendering
renderPage(pageNum);
});
// iframe向vue传递信息
window.iframeSendMsg = function iframeSendMsg(num,total){
window.parent.postMessage({
cmd:'myIframe',
pdfTotal:pageTotal,
readPage:num,
params : {
info: 'iframe向Vue传递的消息',
}
},'*');
};
</script>
<script type="text/javascript">
function triggerByVue(msg){
console.log(msg)
}
</script>
</head>
<body tabindex="1">
<canvas id="the-canvas" style="width: 100%; height: 205;"></canvas>
<div>
<button id="prev">上一页并传给vue</button>
<button id="next">下一页传给vue</button>
<span>Page: <span id="page_num"></span> / <span id="page_count"></span></span>
</div>
<!-- <button onclick="iframeSendMsg()">iframe向Vue传消息</button> -->
</body>
</body>
<script type="text/javascript">
// iframe向vue传递信息
function iframeSendMsg(){
window.parent.postMessage({
cmd:'myIframe',
params : {
info: 'iframe向Vue传递的消息',
}
},'*');
};
// iframe获取Vue传递过来的信息
window.addEventListener("message", getVueMsg);
function getVueMsg(event){
const res = event.data;
if(res.cmd == 'myVue'){
console.log(res)
}
};
function triggerByVue(msg){
console.log(msg)
}
</script>
</html>