使用 html2canvas 捕获的 HTML div 未满

Question

我正在使用https://html2canvas.hertzen.com/ 中的 html2canvas 库在模因编辑器网站上工作

这是我需要捕获的div html 代码：

<div class="container">
    <div id="theUserMeme">

        <div class="row">

            <p id="memeWords">
                When I see something lol 

            </p>

        </div>

        <div class="row">
            <img id = "memeImage" src="images/init meme.jpg">
        </div>

    </div>
</div>

此外，这是我运行以捕获div JavaScript 代码：

function generateMeme(){

    window.scrollTo(0,0);

    html2canvas(document.querySelector("#theUserMeme")).then(canvas => {
        
        var image = canvas.toDataURL('image/jpeg', 1);
        console.log(image);
        
        alert(image);

        document.getElementById("finalImageCopy").src = image;
    });


}

在 Github 上托管代码后，我在 iPhone 和笔记本电脑上尝试了该页面。 它在两种设备上都运行良好，但之后只能在手机上运行。 当我在桌面上使用它时，捕获的图像不完整，有时它只是白色图像。

可能是什么问题？

Answer 1

似乎<div>的默认宽度等于可见区域的宽度（如果我错了，请正确），如果图像较大，它不会“拉伸”div，它只是溢出它

因此，解决此问题的一种方法是添加width: fit-content; 到您的元素： https : //jsfiddle.net/vanowm/h5yroe2q/

 function generateMeme(id, options){ window.scrollTo(0,0); html2canvas(document.querySelector("#theUserMeme"), options).then(canvas => { console.log(canvas); var image = canvas.toDataURL('image/jpeg', 1); console.log(image); document.getElementById(id || "finalImageCopy").src = image; }); } //generate first image generateMeme(); //generate second image with adding options to html2canvas generateMeme("finalImageCopy2", { width: document.querySelector("#theUserMeme").scrollWidth }); //set width document.querySelector("#theUserMeme").style.width = "fit-content"; //generate third image generateMeme("finalImageCopy3");

 body { width: 50px; } pre { width: fit-content; } pre > img { border: 2px solid red; }

 <script src="https://html2canvas.hertzen.com/dist/html2canvas.min.js"></script> <div class="container"> <div id="theUserMeme"> <div class="row"> <p id="memeWords"> When I see something lol </p> </div> <div class="row"> <img id = "memeImage" 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lJS43oZ5etckHWmjgGXgQSkVEpcgL7gCAjlXzAXy8Cgr4agbz40QRt2Afa9QJvfvQBdr9QIrYFsDSfz0yAm88skwKtSBfYAUuzjzAAE70KDtfvQCZ8suQEt60Abb4AbUXXayCacAIu4oZ8OIBNMBxqsgJbvSgKlnoBFl2/UDSXNfMgjb5UUZefDICrwAmi0AqAgBx42yi5eICKXDvse4u7V/MCPh4kF8Hp3gGuYC0l+8gMqSRYLGfZx4Eg0pdogb2eYB9nKwG9l+YGZSqtedjMGfOF77a9xeoqxdbV93IdRpSyuiQai7+fEgKarIQSUkv3xKI5JagVOq49gGd7P5iCqaf748hAlPXL6CAn2aAZU89M/xLAjip6cf39BBVPOtSQPKIQN/LXmBV+7Ayn29nvEFbQByV0nnyAliCNp8Sj/2Q=="> </div> </div> </div> <pre> Captured image: <img id="finalImageCopy"> Captured image manually set canvas width: <img id="finalImageCopy2"> Captured image with <b>width: fit-content</b>: <img id="finalImageCopy3"> </pre>