add style to div generated by html2pdf.js - javascript

html2pdf.js is a package for generating pdf's from html it is based on jspdf and html2canvas. It has a nice feature where it can insert page-breaks in order not to split elements. The way it works is that it loops over all the elements and creates empty div's where a page break needs to be inserted. I would like to style those divs and instead of having blank white space would like to be able to insert a class to determine how they would look. The issue is I don't seem to have access to this new HTML that will be converted to a pdf. The API seems to indicate that this is possible here but when I put in code like this:
var worker = html2pdf();
worker.set(opt).from(finalHtml).toContainer().toCanvas().then(newHtml => {
console.log(newHtml)
return newHtml
})
I am getting undefined. This is true whether I chain to toCanvas() and toContainer or not. Basically I would like the html generated here, how do I access this?

Related

Attributes in html tags and angular is not working

I´m creating application for students where the user is gonna be able to select text and highlight the text, now what i´m doing is get the selected text saved on the server to have persistent marker, in the document each paragraph is a block and each block has a id, in that way i can know where was the selection made, when i get the marker back from the server i get a list of marker per document, i use the start and end of the selection to know where i need to place the marker in the text, when i place the marker a use i create a string like this:
const markerText = `<mark class="${marker.color}"
data-marker-id="${marker.id}">${textSelected}</mark>`;
and i replaced for the one on the original text, but for some reason when replace the text only the class attribute of the mark tag appear in the html, for some reason the data-marker-id it doesn´t.
i event try to use [attr.data-marker.id]="${marker.id}"
because the paragraph(blocks of text) are coming from the server with html markup i getting the content of the block with html tags as string so i´m using
<p [innerHTML]="block.text"></p>
any idea why....?
I think angular teams dropped the $compile functionnality in Angular (2+). It is still possible to load remote html strings and put them in [innerHTML] but that is all. There is no native nor simple way to interpolate data from remote HTML.
See this post :
https://medium.com/lacolaco-blog/forget-compile-in-angular-2-a2893d8291b1

Loading html into page using javascript

So I have this nice piece of javascript that will load local HTML files into my document for me on the fly, which is pretty cool.
function load_html(src) {
var html = document.createElement("object");
html.type = "text/html";
html.data = src;
document.getElementById("wrapper").appendChild(html);
}
I got the idea from the post here How do I load an HTML page in a <div> using JavaScript?.
The only problem with it is that it seems that the object tag that I create needs a default width and height, which I want it to wrap the size of it's containing elements, and the new elements that are within the object tag have their own set of css values instead of using the css value of the current page.
Does anyone know how to make the elements within my object get the css values from my current page?
Also, how can I make my object be the size of it's containing elements?
I'm sure there is an easy way to do it, but I haven't found much on object tags.

Clone HTML and remove some nodes using jQuery

I'm developing a little tool for live editing using Chrome DevTools, and I have a little button "Save" which grabs the HTML and sends it to server to update the static file (.html) using Ajax. Very simple indeed.
My problem is that I need to filter the HTML code before sending it to the server, I need to remove some nodes and I'm trying to achive this using jQuery, something like this:
// I grab all the HTML code
var html = $('<div>').append($('html').clone()).html();
// Now I need to remove some nodes using jQuery
$(html).find('#some-node').remove();
// Send the filtered HTML to server
$.post('url/to/server/blahblahblah');
I already tried this Using jQuery to search a string of HTML with no success. I can't achieve to use jQuery on my cloned HTML code.
Any idea about how to do this?
The DOM is not a string of HTML. With jQuery, you do DOM manipulation, not string manipulation.
What you're doing is
cloning the document (unnecessary because you convert it to HTML anyway),
appending that cloned document to a new div for some reason
converting the content of that div to an HTML string
converting that HTML back to DOM nodes $(html) (so we're back to the first point above)
finding and removing an element in those nodes
presumably posting the html variable to the server.
Unfortunately, the html string has not changed because you manipulated DOM nodes, not the string.
Hopefully you can see above that you're doing all sorts of conversions that have little to do with what you ultimately want.
I don't know wny you'd need to do this, but all you need is to do a .clone(), then the .find().remove(), then .html()
var result = $("html").clone(false);
result.find("#some-node").remove();
var html = result.html();
Maybe like this?
var html = $('html').clone();
html.find('#some-node').remove();

Create new (not change) stylesheets using jQuery

We've got a little tool that I built where you can edit a jQuery template in one field and JSON data in another and then hit a button to see the results immediately within the browser.
I really need to expand this though so the designer can edit a full CSS stylesheet within another field and when we render the template, it will have the CSS applied to it. The idea being that once we've got good results we can take the contents of these three fields, put them in files and use them in our project.
I found the jQuery.cssRule plugin but it looks like it's basically abandoned (all the links go nowhere and there's been no development in three years). Is there something better or is it the only game in town?
Note: We're looking for something where someone types traditional CSS stylesheet data in here and that is used immediately for rendering within the page and that can be edited and changed at will with the old rules going away and new ones used in their stead. I'm not looking for something where the designer has to learn jQuery syntax and enter in individual .css("attribute", "value") type calls to jQuery.
Sure, just append a style tag to the head:
$("head").append("<style>p { color: blue; }</style>");
See it in action here.
You can replace the text in a dynamically added style tag using something like this:
$("head").append("<style id='dynamicStylesheet'></style>");
$("#dynamicStylesheet").text(newStyleTextGoesHere);
See this in action here.
The cleanest way to achieve this is by sandboxing your user-generated content into an <iframe>. This way, changes to the CSS won't affect the editor. (For example, input { display:none; } can't break your page.)
Just render out your HTML (including the CSS in the document's <head>, and write it into the <iframe>.
Example:
<iframe id="preview" src="about:blank">
var i = $('#preview')[0];
var doc = i.contentWindow || i.contentDocument;
if (doc.document) doc = doc.document;
doc.open('text/html',true);
doc.write('<!DOCTYPE html><html>...</html>');
doc.close();
If the user should be able to edit a whole stylesheet, not only single style attributes, then you can store the entered stylesheet in a temporary file and load it into your html document using
$('head').append('<link rel="stylesheet" href="temp.css" type="text/css" />');
sounds like you want to write an interpreter for the css? if it is entered by hand in text, then using it later would be as simple as copy and pasting it into a css file.
so if you have a textarea on your page to type in css and want to apply those rules when you press the button, you could use something like this (only pseudocode, needs work):
//for each css id in the text area
$.each($('textarea[name=cssTextArea]').html().split('#'), function({
//now get each property
$.each($(this).split(';'), function(){
$(elem).css({property:value});
});
});
then you could write something to go through each element that your designer typed in, and get the current css rules for it (including those that you applied using some code like the snippet above) and create a css string from that which could then be output or saved in a db. It's a pain and much faffing around with substrings but unfortunately I don't know of a faster or more efficient way.
Hope this atleast gives you some ideas

Javascript If statement to run some html code

I've got a little bit of javascript embedded in my html (using a .aspx file). I want to perform some sort of if statement which then determines whether or not some sort of chart is displayed. This chart is displayed using html, and I'm assuming the if statement should be written in javascript. However, I don't really know how to "run" this html code from within java. It is basically just drawing a table. Any suggestions? I've seen document.write, but I've only seen that being used with single lines.
You don't really "run" an HTML code. HTML is a markup language and it is mostly used to format and arrange elements that are displayed in the web browser.
The problem you are probably trying to solve is: Display or hide an element based on some condition. A JavaScript code like this is what you want.
if (condition) {
document.getElementById('chart').style.display = "none"
} else {
document.getElementById('chart').style.display = ""
}
Of course whatever element is responsible for displaying the chart should have an id="chart" attribute. e.g. <div id="chart"><!-- Chart related code goes here --></div>.
The JavaScript code I have given alters the display CSS property of this element to hide it or make it visible.
In case this is not what you want but you want to dynamically modify the HTML responsible for the chart, then you need to use the innerHTML property of the element.
Example:
if (condition) {
document.getElementById('chart').innerHTML = "<!-- HTML Code for the chart here -->"
} else {
document.getElementById('chart').innerHTML = ""
}
I'm assuming the if statement should be written in javascript
Unless you are testing something that you can only find out out in JS, then do it server side in your ASP.NET code.
I don't really know how to "run" this html code from within
This is covered by chapter 47 of Opera's WSC: Creating and modifying HTML. You may wish to read some of the earlier chapters first.
java
Java has about as much in common with JavaScript as Car does with Carpet. They are completely different programming languages.
Try writing the if statement in javascript and then rendering the html with the JQuery html() function. Just use a custom html id to locate where you want the html code to go.
<div id = "custom-tag"> </div>
<script>
if (true){
$('#custom-tag').html('YourHtmlString');
} else {
$('#custom-tag').html('DifferentHtmlString');
}
</script>
Read more about html() here: http://api.jquery.com/html/
YourHtmlString & DifferentHtmlString is where you should store your custom html in string format. It will then be rendered wherever you included "div id = 'custom-id'
Hope this helps!

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