Skip to main content

Strange Line Height issue when using JSPDF and HTML2CANVAS

I have spent the past couple days looking at the documentation and issues online and cannot find a similar problem that is relevant to my issue.

What seems to be happening is JSPDF is calculating its own line height based on the font size for the first text node of any given table or div. In fact it seems to create identical font height spacing for any text node, including random test text that is not even inside an element.

The only fix I can find is to add a bunch of negative margins to shift the positioning of the first text elements, but that is not a great option.

I confirmed it is not happening inside HTML2CANVAS by using the onclone() callback to append a child element and compare the 2 layouts.

I have tried setting the lineHeightFactor, which has no effect, setting line-height inline to ensure it is being used. I even completely reset all margins, padding and line-height to 0 and JSPDF still adds the extra spacing to the first text element in any given div element, while everything else is stacked on each other. This does not happen with images, only text nodes.

This is what I am using to trigger the PDF:

        let pdf = new jsPDF({
            orientation: 'landscape',
            unit: 'mm',
            format: 'letter',
            precision: 1,
        })
        pdf.addFileToVFS('Roboto.ttf', this.Base64.roboto)
        pdf.addFont('Roboto.ttf', 'Roboto', 'normal')
        pdf.addFileToVFS('RobotoBold.ttf', this.Base64.robotoBold)
        pdf.addFont('RobotoBold.ttf', 'Roboto', 'bold')
        window['html2canvas'] = html2canvas;
        let html = document.querySelector('.sign-wrap')
        html.style.display = 'block'
        pdf.html(html, {
            html2canvas: {
                allowTaint: true,
                useCORS: true,
                scale: 0.2530,
                logging: false,
            },
            callback: async (pdf) => {
                pdf.save(`sign.pdf`)
                html.style.display = 'none'
            }
        })
        
    }
Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
Labels:

Comments

Post a Comment

Popular posts from this blog

Where and how is this Laravel kernel constructor called? [closed]

Where and how is this Laravel kernel constructor called? public fucntion __construct(Application $app, $Router $roouter) { } I have read the documentation and some online tutorial but I can find any clear explanation. I am learning Laravel and I am wondering where does this kernel constructor receives its arguments from. "POSTMOTERM" CLARIFICATION: Here is more clarity.I have checked the boostrap/app.php and it is only used for boostrapping the interfaces into the container class. What is not clear to me is where and how the Kernel class is instatiated and the arguments passed to the object calling the constructor.Something similar to; obj = new kernel(arg1,arg2) or, is the framework using some magic functions somewhere? Special gratitude to those who burn their eyeballs and brain cells on this trivia before it goes into a full blown menopause alias "MARKED AS DUPLICATE". To some of the itchy-finger keyboard warriors, a.k.a The mods,because I believe in th...
Post a Comment
Read more

Why is my reports service not connecting?

I am trying to pull some data from a Postgres database using Node.js and node-postures but I can't figure out why my service isn't connecting. my routes/index.js file: const express = require('express'); const router = express.Router(); const ordersCountController = require('../controllers/ordersCountController'); const ordersController = require('../controllers/ordersController'); const weeklyReportsController = require('../controllers/weeklyReportsController'); router.get('/orders_count', ordersCountController); router.get('/orders', ordersController); router.get('/weekly_reports', weeklyReportsController); module.exports = router; My controllers/weeklyReportsController.js file: const weeklyReportsService = require('../services/weeklyReportsService'); const weeklyReportsController = async (req, res) => { try { const data = await weeklyReportsService; res.json({data}) console...
Post a Comment
Read more

How to show number of registered users in Laravel based on usertype?

i'm trying to display data from the database in the admin dashboard i used this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count(); echo $users; ?> and i have successfully get the correct data from the database but what if i want to display a specific data for example in this user table there is "usertype" that specify if the user is normal user or admin i want to user the same code above but to display a specific usertype i tried this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count()->WHERE usertype =admin; echo $users; ?> but it didn't work, what am i doing wrong? source https://stackoverflow.com/questions/68199726/how-to-show-number-of-registered-users-in-laravel-based-on-usertype
Post a Comment
Read more