如何打印pdf.js文件? [英] How to print pdf.js document?

问题描述

我已经用pdf.js生成了一个文档，它可以正确显示.我没有打印按钮.如何添加按钮以允许用户进行打印?我正在使用Chrome.

I've generated a document with pdf.js and it shows correctly. I'don't have print button. How to add the button to allow users to print it ? I was using Chrome.

推荐答案

尝试使用javascript函数 window.print(); ，这会打开打印对话框.

Try using the javascript-function window.print();, which opens the print-dialog.

您将必须在html中添加一个按钮，这会触发命令-在pdf中是不可能的.

You will have to add an button to your html, which triggers the command - its not possible within the pdf.

由于这个原因，您将需要一个iFrame，并使用如下所示的内容:

For this reason, you will need an iFrame, and use something like this:

function printIt() {
    var wnd = window.open('http://your-pdf-url');
    wnd.print();
}

<input type="button" value="Print" onclick=printIt()>

window.print()不起作用，因为它还会打印周围的html.

window.print() wouldn't work, because it would also print the surrounding html.

从您的评论中，我现在知道，您想打印画布元素的内容-这要容易得多.

From your comment, I now know, that you want to print the content of a canvas-element - which is much easier.

您不需要iframe，可以将按钮放在同一页上，然后使用 window.print(); .

You don't need an iframe, you can put the button on the same page, and use window.print();.

为了只打印画布元素并隐藏周围环境(如按钮)，可以使用css-Syntax像这样:

In order to only print the canvas-element, and to hide the surroundings (like the button), you can use css-Syntax like this:

@media print
{    
    .no-print, .no-print *
    {
        display: none !important;
    }
}

@media print 指定CSS代码，该代码仅适用于网页(如果已打印).如果现在将 .no-print 类分配给除canvas元素之外的所有内容，则仅会打印pdf.

@media print specifies css-code, which only applies for a webpage, if it gets printed. If you now asign the class .no-print to everything except the canvas-element, only your pdf will be printed.

如果更容易，您也可以使用此CSS代码:

You can also use this css-code, if it's easier:

@media print
{    
    *
    {
        display: none;
    }
    canvas 
    {
        display: inline;
    }
}

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