parallax/jsPDF

autoPaging: 'text' messes up lineheights

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#3403 opened on Apr 6, 2022

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 (9 comments) (6 reactions) (0 assignees)JavaScript (28,280 stars) (4,596 forks)batch import
Bughelp wanted

Description

"I have read and understood the contribution guidelines.".

HTML

<h2>Hi there,</h2><p>this is a <em>basic</em> example of <strong>tiptap</strong>. <br>Next up: A bullet list:</p><ul><li><p>Free Open Source Software</p></li><li><p>Plattform independent</p></li></ul><p>Let’s try a code block:</p><pre><code class="language-css">
body {
    background-color: rgba(200,200,24,1);
}
</code></pre><p>1 Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt </p>

JSPDF

doc.html(editorcontent, {
          callback: (doc) => {     },
          x: 0,
          y: 0,
          margin: [20,20,20,20],
          width :400,
          windowWidth:420,
          autoPaging: 'text',  //text, slice, false
});

As you can see in the following screenshots the < em > and the < strong > tags as well as < code >< pre > tag are messed up somehow.

autoPaging: slice :+1: Screenshot_20220406_211512 autoPaging: text :-1: Screenshot_20220406_211605

i am using "jspdf": 2.5.1 "node": 16.13.2

Contributor guide

Tech stack
javascript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of jsPDF's HTML renderingKnowledge of CSS line height
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Investigate the `autoPaging: 'text'` path in jsPDF's HTML to PDF conversion, likely in `html.js` or related files. Compare with `autoPaging: 'slice'` to identify where line heights go wrong for `<em>`, `<strong>`, `<code>`, and `<pre>` tags. Check existing comments for proposed fixes or workarounds.