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How Can I Generate PDFs from HTML Using JavaScript Beyond Plain Text?

Mary-Kate OlsenOriginal: 2024-12-01 18:31:11897browse

Creating PDFs from HTML using JavaScript: Beyond Plain Text

In the pursuit of generating PDFs from HTML content, many developers have encountered the limitations of popular JavaScript libraries like jsPDF, which primarily handle plain text. To overcome this challenge, it is essential to delve into the world of jsPDF plugins.

Empowering jsPDF with Plugins

By incorporating specific plugins, you can赋予jsPDF the ability to parse and convert HTML into visually appealing PDFs. The key plugins for this task are:

jspdf.plugin.from_html.js
jspdf.plugin.split_text_to_size.js
jspdf.plugin.standard_fonts_metrics.js

Controlling Ignores with ElementHandlers

In cases where certain HTML elements need to be omitted from the PDF, jsPDF's element handlers come into play. By assigning elements an ID, you can designate them for exclusion using a special handler function.

Consider the following HTML where the paragraph with ID "ignorePDF" should be excluded:

<body>
  <p>

The JavaScript code below illustrates the use of element handlers:

var doc = new jsPDF();
var elementHandler = {
  '#ignorePDF': function (element, renderer) {
    return true;
  }
};
doc.fromHTML(document.body, 15, 15, { 'width': 180, 'elementHandlers': elementHandler });

Styling and Limitations to Consider

jsPDF renders certain style attributes like h1, h2, and h3. However, it is important to note that all CSS styles will be stripped from your HTML content.

Additionally, jsPDF only prints text within text nodes. As a result, input fields like textareas will not have their values printed.

Generating the PDF

The following JavaScript code can be used to open the generated PDF in a popup:

doc.output("dataurlnewwindow");

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