Javascript 使用html2canvas的隐藏div屏幕截图
如何拍摄隐藏div的截图? 下面给出的代码不适用于隐藏div HTMLJavascript 使用html2canvas的隐藏div屏幕截图,javascript,jquery,html5-canvas,Javascript,Jquery,Html5 Canvas,如何拍摄隐藏div的截图? 下面给出的代码不适用于隐藏div HTML <div id="mydiv" style="display:none;" > <p>Text</p> </div> <div id="canvas" style="display:none;"> <p>Canvas:</p> </div> <div id="image"> </div>
<div id="mydiv" style="display:none;" >
<p>Text</p>
</div>
<div id="canvas" style="display:none;">
<p>Canvas:</p>
</div>
<div id="image">
</div>
正文
画布:
脚本
<script>
var elem = $('#printDiv');
html2canvas(elem, {
onrendered: function (canvas) {
var data = canvas.toDataURL('image/png');
var image = new Image();
image.src = data;
document.getElementById('image').appendChild(image);
}
});
</script>
var elem=$('printDiv');
html2canvas(元素{
onrendered:函数(画布){
var data=canvas.toDataURL('image/png');
var image=新图像();
image.src=数据;
document.getElementById('image').appendChild(image);
}
});
当我们将div“mydiv”的样式设置为“display:block”时,它就会工作。我不确定是否有现成的方法来实现这一点。显示div,捕获并再次隐藏它怎么样
var elem = $('#printDiv');
html2canvas(elem, {
onrendered: function (canvas) {
elem.show();
var data = canvas.toDataURL('image/png');
var image = new Image();
image.src = data;
document.getElementById('image').appendChild(image);
elem.hide();
}
});
可以使用“不透明度”设置为0。以下是示例:
<div style="position: absolute; opacity: 0.0;">
<div id="tempImageThumbnail"></div>
</div>
var tempImageThumb = $('#tempImageThumbnail');
tempImageThumb.append("<div>some text</div>");
html2canvas([tempImageThumb.get(0)], {
onrendered : function(canvas) {
document.body.appendChild(canvas);
}
});
var tempImageThumb=$(“#tempImageThumbnail”);
tempImageThumb.append(“一些文本”);
html2canvas([tempImageThumb.get(0)]{
onrendered:函数(画布){
document.body.appendChild(画布);
}
});
在div中使用“可见性:无”而不是“显示:无”,并在html2canvas.js脚本文件-函数parseElement change中更改以下内容
if (getCSS(el, 'display') !== "none" && getCSS(el, 'visibility') !== "hidden")
到
首先,我敢说:这个解决方案在所有情况下都能很好地工作
由于此解决方案基于jQueryAPI,因此不要使用
hide/show
,而是使用fadeOut/fadeIn
脚本:
html2canvas通过传递克隆文档提供了一个名为“onclone”的选项。可以在此处设置隐藏元素的可见性
onclone: function(doc){
hiddenDiv = doc.getElementById('myDiv');
hiddenDiv.style.display = 'block';
}
下面的代码适用于我。我将Angular与jsPdf和html2canvas库一起使用
html2canvas(document.getElementById("pdfTable"), {
onclone: function (clonedDoc) {
// I made the div hidden and here I am changing it to visible
clonedDoc.getElementById('pdfTable').style.visibility = 'visible';
}
}).then(canvas => {
// The following code is to create a pdf file for the taken screenshot
var pdf = new jsPDF('l', 'pt', [canvas.width, canvas.height]);
var imgData = canvas.toDataURL("PNG", 1.0);
pdf.addImage(imgData, 0, 0, (canvas.width), (canvas.height));
pdf.save('converteddoc.pdf');
});
这是有效的:
屏幕截图内容
您可以创建一个画布函数,然后根据该函数进行显示和隐藏。我还使用jsPDF将图像转换为pdf。像这样
function generateCanvas() {
html2canvas(document.querySelector("#yourid"), {
scrollX: 0,
scrollY: -window.scrollY
}).then(canvas => {
//var imgData = canvas.toDataURL("image/jpeg", 2.0);
var imgData = canvas.toDataURL({
format: 'jpeg',
quality: 1.0
});
$("#canvas_container").attr("src", imgData);
var pdf = new jsPDF();
pdf.addImage(imgData, 'JPEG', 10, 10, 180, 150); // 180x150 mm @ (10,10)mm
pdf.save("download.pdf");
});
}
$("#download_pdf").on("click", function (e) {
e.preventDefault();
$("#yourid").show();
generateCanvas();
$("#yourid").hide();
})
jQuery版本:
$(clonedDoc).find('#mydiv').css('display','block')代码>jQuery版本:$(clonedDoc).find('#mydiv').css('display','block')代码>请不要使用此选项,html2canvas有一种方法允许您使用克隆文档元素样式…请看这里:使用最新版本的html2canvas.js。这些代码运行良好,因为onrendered
早就被弃用了。第一部分<代码>你好,世界代码>第2部分$('#btn click')。在('click',function(){html2canvas(document.querySelector('capture'),{removeContainer:false,onclone:function(doc){div=$(doc)。find('capture');div.css('opacity','1.0');})。然后(canvavas=>{document.body.appendChild(canvas)console.log(canvas);var-imagedata=canvas.toDataURL('image/png'));console.log(imagedata);});})
onclone: function(doc){
hiddenDiv = doc.getElementById('myDiv');
hiddenDiv.style.display = 'block';
}
html2canvas(mydiv, {
onclone: function (clonedDoc) {
clonedDoc.getElementById('mydiv').style.display = 'block';
}
}).then((canvas)=>{
//your onrendered function code here
})
html2canvas(document.getElementById("pdfTable"), {
onclone: function (clonedDoc) {
// I made the div hidden and here I am changing it to visible
clonedDoc.getElementById('pdfTable').style.visibility = 'visible';
}
}).then(canvas => {
// The following code is to create a pdf file for the taken screenshot
var pdf = new jsPDF('l', 'pt', [canvas.width, canvas.height]);
var imgData = canvas.toDataURL("PNG", 1.0);
pdf.addImage(imgData, 0, 0, (canvas.width), (canvas.height));
pdf.save('converteddoc.pdf');
});
function generateCanvas() {
html2canvas(document.querySelector("#yourid"), {
scrollX: 0,
scrollY: -window.scrollY
}).then(canvas => {
//var imgData = canvas.toDataURL("image/jpeg", 2.0);
var imgData = canvas.toDataURL({
format: 'jpeg',
quality: 1.0
});
$("#canvas_container").attr("src", imgData);
var pdf = new jsPDF();
pdf.addImage(imgData, 'JPEG', 10, 10, 180, 150); // 180x150 mm @ (10,10)mm
pdf.save("download.pdf");
});
}
$("#download_pdf").on("click", function (e) {
e.preventDefault();
$("#yourid").show();
generateCanvas();
$("#yourid").hide();
})