How to set up a printer using Javascript

Javascript is a widely used programming language that can implement a variety of different functions on web pages, including setting up printers. In this article, we'll explore how to use Javascript to set up a printer so that web pages can be printed out more easily.

Print function in Javascript

In Javascript, there are two different printing functions: window.print() and window.printPreview(). Among them, window.print() is used to directly print out the current webpage, while window.printPreview() allows users to preview the webpage content before printing. If the web page does not require print preview, then just use window.print().

For example, we can use the following code to set a button so that the current web page can be automatically printed when the button is pressed:

<button onclick="window.print()">打印</button>

In the above code, we use window.print() function to implement the printing function. We bind this function to a button so that when the button is pressed, the current web page can be printed directly.

Set the printer's page size

When printing, you usually need to adjust the printer's page size. For example, you can set the page size to A4 paper size to ensure that the printed content is as expected. In Javascript, we can use the following code to set the page size:

var pageWidth = 595;
var pageHeight = 842;
window.print();

In the above code, we first define the width and height of the printer page, which are 595 and 842 respectively. Then, we used the window.print() function to trigger the printing operation. During the print operation, the page size will be automatically set to the size we specify.

Set the page orientation of the printer

In addition to the page size, we can also use Javascript to set the page orientation of the printer. For example, you can set the page orientation to landscape to accommodate some content that requires a landscape page. The following is a sample code:

@media print {
    @page {
        size: landscape;
    }
}

window.print();

In the above code, we use the two CSS properties @media print and @page to set the direction of the printer page. Specifically, we set the @page attribute to landscape to specify that the page orientation be landscape. Then, we use the window.print() function to trigger the printing operation. During the print operation, the page orientation will be automatically set to the landscape we specified.

Summary

Through the above introduction, we can use Javascript to set up the printer to achieve more convenient web page printing operations. Specifically, we can use the window.print() function to directly print web pages, and use the @media print and @page attributes to set the page size and orientation. These functions can be widely used in many scenarios, such as web design, office and other fields. Therefore, it is very important for developers to be proficient in this knowledge.

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