jquery incomplete printing

Title: In-depth understanding of the causes and solutions of jQuery’s incomplete printing

Foreword:

In the process of using jQuery, we often encounter the problem of incomplete printing, such as when using print () function, sometimes only part of the content will be printed but not all the content. This problem may not be easy to find, but it does cause some trouble for development. This article will delve into the reasons why jQuery prints incompletely and provide some solutions.

1. Cause Analysis

First of all, we need to make it clear: the reason for incomplete jQuery printing is not a problem with jQuery itself. It is caused by some limitations and mechanisms of the browser.

Specifically, when there are a large number of images or complex CSS styles in the page, the browser will load the page in sections, and the print() function will only print the loaded content. So, if our content is divided into multiple parts, and one part has not been loaded, the print() function will not print it out.

In addition, some browsers will also limit the print() function. For example, in the Safari browser, only the content displayed in the current window will be printed. In Firefox, only the content at the top of the current window will be printed.

2. Solution

1. CSS style problem

For CSS style problems, we can use @media print{} to optimize the printing effect. For example, we can use the following code to correct CSS style changes that occur during printing.

@media print {
body * {

visibility: hidden;

}
.print-container, .print-container * {

visibility: visible;

}
. print-container {

position: absolute;
left: 0;
top: 0;

}
}

The function of this code is to set all elements in the page to be invisible when printing, and then print them in the print-container container Set the visibility of the element, and finally set the position of this container to absolute positioning. In this way, the integrity of the page printed in the print() function can be achieved.

2. Paging loading problem

For the problem of browser segmented loading, we can avoid the problem of incomplete printing by using the window.print() function to perform step-by-step operations. . Specifically, we can encapsulate the step-by-step operation as follows:

function printPage() {
var pages = document.getElementsByTagName('section'),

  totalPages = pages.length,
  currentPage = 0;

function printCurrentPage () {

var printing = window.open('', '', 'width=800,height=600');
printing.document.write(pages[currentPage].innerHTML);
printing.document.close();
printing.focus();
setTimeout(function() {
  printing.print();
  printing.close();
  if (currentPage < totalPages - 1) {
    currentPage ++;
    printCurrentPage();
  }
}, 1000);

}
printCurrentPage();
}

The function of this code is to divide the page into pages according to each section, and then print it in sequence through recursion , and finally achieve the complete printing effect.

3. Browser restriction issues

For browser restriction issues, we can provide different solutions for different browsers. For example, in Safari browser, we can use the following code to print:

if(navigator.userAgent.indexOf('Safari') != -1 && navigator.userAgent.indexOf('Chrome') = = -1) {
var printContent = document.getElementsByClassName('.print-container')[0];
var WinPrint = window.open('', '', 'width=1600,height=1200 ');
WinPrint.document.write(printContent.innerHTML);
WinPrint.document.close();
setTimeout(function() {

WinPrint.print();
WinPrint.close();

}, 1000);
} else {
window.print();
}

The function of this code is that when the browser is Safari, we will first reload the content we want to print. , and then print; for other browsers, use the window.print() function directly to print.

End:

This article only briefly explains the reasons for jQuery’s incomplete printing and some solutions. In fact, more complex problems are not included here. If developers encounter some more complex problems during the development process, they can solve these problems by viewing relevant documents and information, and communicating with other developers.

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