I have multiple pages generated using PDFKit. How can I add page numbers to the bottom?
PDFKit.configure do |config|
config.default_options = {
header_right: "Page [page] of [toPage]"
}
end
kit = PDFKit.new(body_html)
Read all detailed documentation here:
http://madalgo.au.dk/~jakobt/wkhtmltoxdoc/wkhtmltopdf-0.9.9-doc.html
PDFKit is just a wrap up for wkhtmltopdf application that is written in C.
you need to specify a footer like this:
kit = PDFKit.new(your_html_content_for_pdf, :footer_html => "#{path_to_a_footer_html_file}")
then in the footer file have this:
<html>
<head>
<script type="text/javascript">
function subst() {
var vars={};
var x=document.location.search.substring(1).split('&');
for(var i in x) {var z=x[i].split('=',2);vars[z[0]] = unescape(z[1]);}
var x=['frompage','topage','page','webpage','section','subsection','subsubsection'];
for(var i in x) {
var y = document.getElementsByClassName(x[i]);
for(var j=0; j<y.length; ++j) y[j].textContent = vars[x[i]];
}
}
</script>
</head>
<body style="margin: 0;" onload="subst();">
Page <span class="page"></span> of <span class="topage"></span>
</body>
</html>
elements of classes 'frompage','topage','page','webpage','section','subsection','subsubsection' will get substituted with the appropriate data
I did page number with PDFKit, just by adding this:
%meta{:name => 'pdfkit-footer_right', :content => "[page]"}
in my haml file, in my RoR project.
For some weird reason, ( perhaps because I'm using slim ) - I have to use single quotes around the content, instead of double quotes - or else it attempts to escape the brackets and raw text "[page]" shows up, so try single quotes if you run into this issue with your pages.
Related
I am using katex to render math.
https://github.com/Khan/KaTeX
Generally, to get this to work I link to the files katex.min.js and katex.min.css from a cdn, which is one of the ways the directions suggest.
I wrap what needs to be rendered in tags and give all the same class. For example:
<span class='math'>\begin{bmatrix}a & b \\c & d\end{bmatrix}</span>
And inside a script tag I apply the following:
var math = document.getElementsByClassName('math');
for (var i = 0; i < math.length; i++) {
katex.render(math[i].innerHTML, math[i]);
}
So, my implementation works but there is a problem in what katex returns. The output of the above gives me:
This exact same question is asked here:
https://github.com/j13z/reveal.js-math-katex-plugin/issues/2
But I can't understand any of it.
The solution is to use element.textContent, not element.innerHTML.
If I use a form like what follows, the matrix will be rendered properly.
var math = document.getElementsByClassName('math');
for (var i = 0; i < math.length; i++) {
katex.render(math[i].textContent, math[i]); // <--element.textContent
}
A solution that works for me is the following (it is more of a hack rather than a fix):
<script type="text/javascript">
//first we define a function
function replaceAmp(str,replaceWhat,replaceTo){
replaceWhat = replaceWhat.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
var re = new RegExp(replaceWhat, 'g');
return str.replace(re,replaceTo);
}
//next we use this function to replace all occurences of 'amp;' with ""
var katexText = $(this).html();
var html = katex.renderToString(String.raw``+katexText+``, {
throwOnError: false
});
//hack to fix amp; error
var amp = '<span class="mord mathdefault">a</span><span class="mord mathdefault">m</span><span class="mord mathdefault">p</span><span class="mpunct">;</span>';
var html = replaceAmp(html, amp, "");
</script>
function convert(input) {
var input = input.replace(/amp;/g, '&'); //Find all 'amp;' and replace with '&'
input=input.replace(/&&/g, '&'); //Find all '&&' and replace with '&'. For leveling 10&x+ &3&y+&125&z = 34232
var html = katex.renderToString(input, {
throwOnError: false});
return html
}
Which version are you using?
Edit the src/utils.js and comment line number 51 to 55 after updated run in terminal npm run build command.
I want to use a string variable which could contain the values h1, h2, h3 etc to build some html. This works fine for the opening tag, but does not work nicely for the closing tag. If I write
#{ var tag = "h1" ; }
<#tag>some title here</#tag>
I end up with the html
<h1>some title here</#h1>
A work-around which seems to work is
<#tag>some title here<#("/"+tag)>
but it's pretty ugly. Is there some escape sequence I need to use here?
You can use Html.Raw.
string lineTemplate = "<h{0}>{1}</h{0}>";
for (int tagCounter = 1; tagCounter < 7; tagCounter++)
{
#Html.Raw(string.Format(lineTemplate, tagCounter, "Header "+ tagCounter));
}
i am not sure which Razor version you are using
but i tested your code in my MVC4, it works perfectly
it will render <h1>something</h1>
I have an HTML page with the following opening body tag:
<body class="one two three" id="five" data-key="value">
And I'm using lua patterns append a div to the end:
<body class="one two three" id="five" data-key="value"><div></div>
How do I do this?
Note: I've used the following before to insert a script before the head tag:
body_filter_by_lua_block {
replacestr = "<script></script></head>"
ngx.arg[1] = ngx.re.sub(ngx.arg[1],"</head>", replacestr)
return
}
Therefore, if I add my div to replacestr, what do I replace ngx.re.sub(ngx.arg[1],"</head>", replacestr) with?
I did it.
ngx.re.sub(ngx.arg[1], '(<body[^>]*>)', "${0}" .. replacestr)
I am working on Ruby on Rails project and I have implemented markdown syntax for some text descriptions in my project using redcarpet gem.
It works like charm allowing to convert markdown text to HTML as simply as
<%= markdown some_text_variable %>
But now I want to implement preview feature rendering just small part of the full text.
The following naive construction
<%= markdown some_text_variable[0..preview_length] %>
will not work because it can easily break down MD syntax resulting in confusing constructions (imagine, for example, spliting original string on the half of image link).
I came up with
<%= markdown some_text_variable[0..preview_length].split(/\r?\n/)[0..-2].join("\r\n")) %>
but it does not deal, for example, with code blocks.
Is there any way to implement such kind of preview for MD text?
Using markdown.js and / or showdown should work. Here's a StackO with the same question and answer. I personally have used showdown in an Ember app before to render a live preview of the text as it's being typed (via 2-way data binding), and it worked flawlessly.
In the fiddle below, I wrote a little Showdown parser that takes in a string of markdown, splits it on a newline (returns an array of tags), and iterates through the array. On each iteration, it removes the tags, checks the length of the resulting string, and then compares it to the max character count for the preview. Once the next iteration surpasses the max character count, it returns the preview. The do loop ensures that you will always get at least one blob of html as a preview.
Fiddle
$(function() {
var converter = new Showdown.converter();
var previewMax = 200;
$('button').click(function() {
var content = $('#markdown').val(),
charCount = 0,
i = 0,
output = '';
if (!content) {
return $('div.preview').html("Please enter some text.");
}
var mark = converter.makeHtml(content);
var mark_arr = mark.split('\n');
while (charCount < previewMax) {
var html = mark_arr[i];
var text = htmlStrip(html);
if ((charCount + text.length) > previewMax) {
var overflow = (charCount + text.length) - previewMax;
var clipAmount = text.length - overflow;
html = jQuery.truncate(mark_arr[i], { length: clipAmount });
}
output += html;
charCount += text.length;
i++;
};
$('div.preview').html(output);
$('div.full').html(mark);
});
function htmlStrip (html) {
var div = document.createElement('div');
div.innerHTML = html;
var text = div.textContent || div.innerText || "";
return text;
}
});
REVISION
I updated the function using jQuery Truncate to cut the final string into an elipses so that all your previews are the same length as the others. Also, I realized that the original function returned a long string of undefined' over and over when no text was entered, so there is a check to eliminate that. Since this loop will always return at least one html item now, I changed the do loop to a while loop for easier reading. Finally, if you want your truncation to always end at a word boundary, pass the words: true option when you call it. Obviously, this will not give you the same level of truncation for every preview, but it will improve legibility. That's it!
I want to share my preview version it was quite simple with showdown.js and prism.js syntax highlighting.
Prism.js is syntaxing easily with JavaScript and CSS. All you need to pick specific languages and download it to assets folder. Or you can specify it to specific pages.
This is going to happen in realtime preview, in a form.
In Rails form:
<div class="col-md-12">
<div class="form-group">
<%= f.label :body %>
<%= f.text_area :body, class: "form-control", rows: 10 %>
</div>
</div>
<div class="col-md-12">
<h1> Preview Markdown </h1>
<div class="form-group markdownOutput"></div>
</div>
And add this script right below a form page.
<script>
function mkdown(){
var converter = new showdown.Converter(),
$post_body = $("#post_body");
// This line will keep adding new rows for textarea.
function postBodyLengthDetector(post_body){
var lines = post_body.val().split("\n");
post_body.prop('rows', lines.length+5);
}
// Textarea rows in default '10', when focusing on this. It will expand.
$post_body.focus(function(){
postBodyLengthDetector($(this));
$('.markdownOutput').html(converter.makeHtml($post_body.val()));
});
// All simple magic goes here, each time when texting anything into textarea
//it will be generated to markdown. You are able to see preview right below of textarea.
$post_body.keyup(function() {
postBodyLengthDetector($(this));
var value = $( this ).val(),
html = converter.makeHtml(value);
$('.markdownOutput').html(html);
});
}
$(mkdown);
$(document).on("turbolinks:load", mkdown);
</script>
First, I know, there already is a Markdown parser for PHP.
I also took a look to this question but it doesn't answer to my question.
Obviously, even if the title mention PHP, if it's language agnostic, because I'd like to know what are the step I've to go through to do that.
I've read about PEG, but I've to admit, I didn't really understand the example provided with the PHP parser.
I've also read about CFG.
I've found Zend_Markup_Parser_Textile which seems to construct a so called "Token Tree" (what's about it?) but it currently unusable. (Btw, Textile is not Markdown)
So, concretely, how would you go to this?
Obviously I though about using Regex but, I'm afraid.
Because Markdown supports several syntaxes for the same element (Setext and atx).
Could you give some starting point?
You should have a look at Parsedown.
It parses Markdown text the way people do. First, it divides texts into lines. Then it looks at how these lines start and relate to each other. Finally, it looks for special characters to identify inline elements.
There is PHP Markdown Extra that seems to be popular, you could start by looking at its source.
Also, there is an object-oriented implementation of Markdown which is faster: markdown-oo-php
Ciconia - A New Markdown Parser for PHP is a good one I found.
You just need 3 things to do :
1.Install Ciconia and parse file according to the document.
2. Add corresponding css theme to make it nice, like github markdown style or here.
3. Add syntax highlighting javascript, like google Javascript code prettifier.
Then everything will look pretty good.
If you want a complete example, here is my working demo for github style markdown:
<?php
header("Content-Type: text/html;charset=utf-8");
require 'vendor/autoload.php';
use Ciconia\Ciconia;
use Ciconia\Extension\Gfm;
$ciconia = new Ciconia();
$ciconia->addExtension(new Gfm\FencedCodeBlockExtension());
$ciconia->addExtension(new Gfm\TaskListExtension());
$ciconia->addExtension(new Gfm\InlineStyleExtension());
$ciconia->addExtension(new Gfm\WhiteSpaceExtension());
$ciconia->addExtension(new Gfm\TableExtension());
$ciconia->addExtension(new Gfm\UrlAutoLinkExtension());
$contents = file_get_contents('Readme.md');
$html = $ciconia->render($contents);
?>
<!DOCTYPE html>
<html>
<head>
<title>Excel to Lua table - Readme</title>
<script src="https://cdn.rawgit.com/google/code-prettify/master/loader/run_prettify.js"></script>
<link rel="stylesheet" href="./github-markdown.css">
<style>
.markdown-body {
box-sizing: border-box;
min-width: 200px;
max-width: 980px;
margin: 0 auto;
padding: 45px;
}
</style>
</head>
<body>
<article class="markdown-body">
<?php
# Put HTML content in the document
echo $html;
?>
</article>
</body>
</html>
Using regexes.
<?php
/**
* Slimdown - A very basic regex-based Markdown parser. Supports the
* following elements (and can be extended via Slimdown::add_rule()):
*
* - Headers
* - Links
* - Bold
* - Emphasis
* - Deletions
* - Quotes
* - Inline code
* - Blockquotes
* - Ordered/unordered lists
* - Horizontal rules
*
* Author: Johnny Broadway <johnny#johnnybroadway.com>
* Website: https://gist.github.com/jbroadway/2836900
* License: MIT
*/
class Slimdown {
public static $rules = array (
'/(#+)(.*)/' => 'self::header', // headers
'/\[([^\[]+)\]\(([^\)]+)\)/' => '<a href=\'\2\'>\1</a>', // links
'/(\*\*|__)(.*?)\1/' => '<strong>\2</strong>', // bold
'/(\*|_)(.*?)\1/' => '<em>\2</em>', // emphasis
'/\~\~(.*?)\~\~/' => '<del>\1</del>', // del
'/\:\"(.*?)\"\:/' => '<q>\1</q>', // quote
'/`(.*?)`/' => '<code>\1</code>', // inline code
'/\n\*(.*)/' => 'self::ul_list', // ul lists
'/\n[0-9]+\.(.*)/' => 'self::ol_list', // ol lists
'/\n(>|\>)(.*)/' => 'self::blockquote ', // blockquotes
'/\n-{5,}/' => "\n<hr />", // horizontal rule
'/\n([^\n]+)\n/' => 'self::para', // add paragraphs
'/<\/ul>\s?<ul>/' => '', // fix extra ul
'/<\/ol>\s?<ol>/' => '', // fix extra ol
'/<\/blockquote><blockquote>/' => "\n" // fix extra blockquote
);
private static function para ($regs) {
$line = $regs[1];
$trimmed = trim ($line);
if (preg_match ('/^<\/?(ul|ol|li|h|p|bl)/', $trimmed)) {
return "\n" . $line . "\n";
}
return sprintf ("\n<p>%s</p>\n", $trimmed);
}
private static function ul_list ($regs) {
$item = $regs[1];
return sprintf ("\n<ul>\n\t<li>%s</li>\n</ul>", trim ($item));
}
private static function ol_list ($regs) {
$item = $regs[1];
return sprintf ("\n<ol>\n\t<li>%s</li>\n</ol>", trim ($item));
}
private static function blockquote ($regs) {
$item = $regs[2];
return sprintf ("\n<blockquote>%s</blockquote>", trim ($item));
}
private static function header ($regs) {
list ($tmp, $chars, $header) = $regs;
$level = strlen ($chars);
return sprintf ('<h%d>%s</h%d>', $level, trim ($header), $level);
}
/**
* Add a rule.
*/
public static function add_rule ($regex, $replacement) {
self::$rules[$regex] = $replacement;
}
/**
* Render some Markdown into HTML.
*/
public static function render ($text) {
$text = "\n" . $text . "\n";
foreach (self::$rules as $regex => $replacement) {
if (is_callable ( $replacement)) {
$text = preg_replace_callback ($regex, $replacement, $text);
} else {
$text = preg_replace ($regex, $replacement, $text);
}
}
return trim ($text);
}
}
echo Slimdown::render ("# Title
And *now* [a link](http://www.google.com) to **follow** and [another](http://yahoo.com/).
* One
* Two
* Three
## Subhead
One **two** three **four** five.
One __two__ three _four_ five __six__ seven _eight_.
1. One
2. Two
3. Three
More text with `inline($code)` sample.
> A block quote
> across two lines.
More text...");
Origin https://gist.github.com/jbroadway/2836900