html2canvas无法正确呈现特定数据uri

Question

我有这样的div

渲染输出后显示

。

html2canvas代码：

html2canvas(document.getElementById('widgetElemet'), {
    logging: true,
    profile: true,
    useCORS: true,
    allowTaint: true,
    onrendered: function(canvas) {
        var dataURL = canvas.toDataURL();

        var param = {
            to: emailToArray.validEmails,
            cc: emailCCArray.validEmails,
            bcc: emailBccArray.validEmails,
            emailid: UserDetails.email,
            subject: emailSubject,
            message: emailMessage,
            ImageDataURI: dataURL
        }

        this.postScreenShot(param)    
    }.bind(this)

}）

该图片的数据uri

data:image/svg+xml;base64,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

Answer 1

我刚检查了您的base64 SVG并看到它显示width和height 0，这可能就是问题所在。

替代解决方案同base64 SVG background-image一样适用于div，您的问题将得到解决。

＆＃13;

＆＃13;

window.takeScreenShot = function() {
  html2canvas(document.getElementById("target"), {
    onrendered: function(canvas) {
      document.body.appendChild(canvas);
    },
    width: 300,
    height: 300
  });
}

＆＃13;

#target {
  background-image: url('data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6IEFkb2JlIElsbHVzdHJhdG9yIDIwLjAuMCwgU1ZHIEV4cG9ydCBQbHVnLUluIC4gU1ZHIFZlcnNpb246IDYuMDAgQnVpbGQgMCkgIC0tPgo8c3ZnIHZlcnNpb249IjEuMSIgaWQ9IkxheWVyXzIiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkveGxpbmsiIHg9IjBweCIgeT0iMHB4IgoJIHZpZXdCb3g9IjAgMCA2NCA2NCIgc3R5bGU9ImVuYWJsZS1iYWNrZ3JvdW5kOm5ldyAwIDAgNjQgNjQ7IiB4bWw6c3BhY2U9InByZXNlcnZlIj4KPHN0eWxlIHR5cGU9InRleHQvY3NzIj4KCS5zdDB7ZmlsbDpub25lO3N0cm9rZTojOTk5OTk5O3N0cm9rZS13aWR0aDoyO3N0cm9rZS1saW5lY2FwOnJvdW5kO3N0cm9rZS1taXRlcmxpbWl0OjEwO30KPC9zdHlsZT4KPHBhdGggY2xhc3M9InN0MCIgZD0iTTIxLjksMjIuMmMwLDMuNS0yLjksNi40LTYuNCw2LjRzLTYuNC0yLjktNi40LTYuNHMyLjktNi40LDYuNC02LjRTMjEuOSwxOC43LDIxLjksMjIuMnogTTQuMiw1MWwyMi4xLTE5CgkgTTQ2LjUsNTEuMUwyNi40LDMyIE0zNy42LDQyLjZsMTEuNi0xMCBNNjIuNCw0NS4xTDQ5LjIsMzIuNyBNNjMsMUgxdjYyaDYyVjF6IE0xLDUxLjRoNjIiLz4KPC9zdmc+Cg==');
  width: 300px;
  height: 300px;
}

button {
  display: block;
  height: 20px;
  margin-top: 10px;
  margin-bottom: 10px;
}

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.4.1/html2canvas.min.js"></script>

<div id="target">
</div>

<button onclick="takeScreenShot()">to image</button>

＆＃13;

＆＃13;

＆＃13;

Answer 2

我使用的是.png，但html2canvas无法显示.png文件。

所以我使用svg代替.png - 将.png转换为.svg。

它对我有用。