我正在使用html2canvas从我的html页面生成图像。
当我输入我的url http://prompter.rareapps.org/prompt/prompt-save2.php?p=123
在html2canvas网站(http://html2canvas.hertzen.com/screenshots.html)的网页渲染器中,我的页面是用背景直接渲染的。
但是当我生成自己的画布时,我没有背景。以下是我的代码
<script type="text/javascript">
$( document ).ready(function() {
html2canvas(document.body, {
allowTaint: true,
taintTest: false,
onrendered: function(canvas) {
window.location.href = canvas.toDataURL('image/jpeg');
}
});
});我错过了什么?
谢谢
发布于 2014-04-10 23:45:27
此问题已在0.5.0版本中修复(但0.5.0版本尚未准备好使用)。
但是有很多问题正在被纠正,基本功能还没有实现。
注意: html2canvas没有预测0.5.0版本的日期注意:版本0.4.1不再接收更新
问题是0.5.0版本还没有准备好使用,我重新编写了你的html,请参阅:
<!DOCTYPE html><!--// Never put a space/break-line before the DOCTYPE -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="UTF-8">
<script type="text/javascript" src="html2canvas.js"></script>
<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.0.min.js"></script>
<style type="text/css">
html, body {
margin: 0;
padding: 0;
height: 100%;
}
body {
font-family: Georgia, serif;
font-size: 4em;
}
p {
padding: 5px 0;
margin: 0;
}
#main {
margin: 0 auto;
width: 100%;
min-height: 100%;
font-weight: bold;
background: white url('prompt-save-bg.jpg') center top repeat-y;
max-width: 1263px; /* background-limit*/
text-align: center;
}
#article {
padding: 5em 2em 0 2em;
font-weight: bold;
}
#article p.info {
font-size: 0.2em; padding: 40em 0;
}
</style>
<script type="text/javascript">
//<!CDATA[
function save(canvas) {/*html2canvas-0.5.0 work with Promise.js*/
window.open(canvas.toDataURL());
}
$(document).ready(function(){
$('#save-image').click(function () {
html2canvas(document.body, {
allowTaint: true,
logging: true,
taintTest: false,
onrendered: save /*0.4.1*/
}).then(save);/*0.5.0-rc*/
});
});
//]]>
</script>
</head>
<body>
<div id="main">
<input value="Generate Image" id="save-image" download="YourFileName.jpg" type="button">
<div id="article">
<h2>AUBREY</h2>
<p>And Aubrey was her name</p>
<p>A not so very ordinary girl or name</p>
<p>But who's to blame?</p>
<p>For a love that wouldn't bloom</p>
<p>For the hearts that never played in tune</p>
<p>Like a lovely melody that everyone can sing</p>
<p>Take away the words that rhyme, it doesn't mean a thing</p>
<p> </p>
<p>And Aubrey was her name</p>
<p>We tripped the light and danced together to the moon</p>
<p>But where was June?</p>
<p>No, it never came around</p>
<p>If it did it never made a sound</p>
<p>Maybe I was absent or was listening too fast</p>
<p>Catching all the words but then the meaning going past</p>
<p> </p>
<p>But God I miss the girl</p>
<p>And I'd go a thousand times around the world just to be</p>
<p>Closer to her than to me</p>
<p> </p>
<p>And Aubrey was her name</p>
<p>I never knew her but I loved her just the same</p>
<p>I loved her name</p>
<p>Wish that I had found the way</p>
<p>And the reasons that would make her stay</p>
<p>I have learned to lead a life apart from all the rest</p>
<p>If I can't have the one I want, I'll do without the best</p>
<p> </p>
<p>But how I miss the girl</p>
<p>And I'd go a million times around the world just to say</p>
<p>She had been mine for a day</p>
<p class="info">
Prompter generated by RAREAPPS: http://prompter.rareapps.org
</p>
</div>
</div>
</body>
</html>0.4.1和0.5.0-rc.注意,我创建了一个名为save()的函数,因此您可以在onrendered (版本0.4.1)或then (版本0.5.0-rc)之间切换。
我放了你的背景和一个<DIV>没有改变<html>和<body>,因为"html2canvas“不够聪明,不能理解窗口中overflow:的操作。
请注意,最后一段中的margin:; (<p>)在"html2canvas“和"Webkit”浏览器中都造成了问题,所以我使用了padding:
记住,有不止一种方法可以做同样的事情。
发布于 2016-11-11 20:41:38
当前最新版本的0.4.1版本中,背景大小属性设置为封面的背景图片存在问题。
这个页面中的“fperich”提供的解决方案解决了我的问题:https://github.com/niklasvh/html2canvas/issues/265
根据他的解决方案,只需使用以下语句更新版本0.4.1中的第350行:
topPos = isNaN(parseInt(bgposition[1], 10)) ? topPos : parseInt(bgposition[1], 10); 发布于 2016-07-14 00:39:30
明确设置背景样式,例如。如果
...
html2canvas(document.body,
{
onrendered: function(canvas){
var imgData = canvas.toDataURL("image/jpeg");
var doc = new jsPDF('p','mm');
doc.addImage(imgData, 'JPEG', 15, 40, 180, 160);
doc.save($.now()+'.pdf');
}pdf具有空白(黑色)背景,
现在,如果您添加CSS样式
body {
background-color: white;
}空白(黑色)背景已更正
https://stackoverflow.com/questions/22569210
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