Create new (not change) stylesheets using jQuery - javascript

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

Related

Convert HTML with CDN Libraries and External stylesheets to PDF

I designed my resume with bootstrap and material design lite, now I want to convert the html page to pdf file.
I tried some libraries (jsPdf) and some tools (html2pdf, princexml), it produces the pdf file but the problem is, that pdf is not what it looks in the html page.
There is no styles, the output i am getting is similar to pressing ctrl+p` in browser.
My question is,
Is there any tools or libraries for my problem ?
or
Is there any options in above mentioned tools that i can use?
pdf outputs
Try this converter WKHTMLTOPDF on your back-end. It outputs exactly what your see in you browser. It supports html, css and even js. Wkhtmltopdf based on webkit.
Using runtime it can be used like that
wkhtmltopdf http://google.com google.pdf
In your case, it seems that wkhtmltopdf can not load css. Check right css include path. Do not use relative path.
Your problem is the Bootstrap library, not any plugins or PDF tools you are using. It removes most styles when you "print" a web page, including print to PDF. My company, the DocRaptor HTML to PDF service, has a great blog post with a list of suggested fixes for getting Bootstrap styles to print correctly, but they could be summarized as:
Print using screen CSS mode/rules, not print. Otherwise, you have to a lot of overrides for Bootstrap to get it to work right. Much easier to just make the renderer use screen mode.
Bootstrap will think most PDFs are an extra small device, like a cell phone, so you have to either adjust your breakpoints or your in-code column definitions.
If your last column drops to a new row, this is because Bootstrap defines the width for many columns as XX.66666667%. The PDF engine adds all these up, and because of the 7 at the end, it is technically greater than 100%. Since the row width is over 100%, it bumps the last column to a new row. the fix is to override Bootstrap's column widths (handy Gist file for that).
jsPDF is able to use plugins. In order to enable it to print HTML, you have to include certain plugins and therefore have to do the following:
Go to https://github.com/MrRio/jsPDF and download the latest Version.
Include the following Scripts in your project:
jspdf.js
jspdf.plugin.from_html.js
jspdf.plugin.split_text_to_size.js
jspdf.plugin.standard_fonts_metrics.js
If you want to ignore certain elements, you have to mark them with an ID, which you can then ignore in a special element handler of jsPDF. Therefore your HTML should look like this:
<!DOCTYPE html>
<html>
<body>
<p id="ignorePDF">don't print this to pdf</p>
<div>
<p><font size="3" color="red">print this to pdf</font></p>
</div>
</body>
</html>
Then you use the following JavaScript code to open the created PDF in a PopUp:
var doc = new jsPDF();
var elementHandler = {
'#ignorePDF': function (element, renderer) {
return true;
}
};
var source = window.document.getElementsByTagName("body")[0];
doc.fromHTML(
source,
15,
15,
{
'width': 180,'elementHandlers': elementHandler
});
doc.output("dataurlnewwindow");
For me this created a nice and tidy PDF that only included the line 'print this to pdf'.
Please note that the special element handlers only deal with IDs in the current version, which is also stated in a GitHub Issue. It states:
Because the matching is done against every element in the node tree, my desire was to make it as fast as possible. In that case, it meant "Only element IDs are matched" The element IDs are still done in jQuery style "#id", but it does not mean that all jQuery selectors are supported.
Therefore replacing '#ignorePDF' with class selectors like '.ignorePDF' did not work for me. Instead you will have to add the same handler for each and every element, which you want to ignore like:
var elementHandler = {
'#ignoreElement': function (element, renderer) {
return true;
},
'#anotherIdToBeIgnored': function (element, renderer) {
return true;
}
};
From the examples it is also stated that it is possible to select tags like 'a' or 'li'. That might be a little bit to unrestrictive for the most usecases though:
We support special element handlers. Register them with jQuery-style
ID selector for either ID or node name. ("#iAmID", "div", "span" etc.)
There is no support for any other type of selectors (class, of
compound) at this time.
One very important thing to add is that you lose all your style information (CSS). Luckily jsPDF is able to nicely format h1, h2, h3 etc., which was enough for my purposes. Additionalyl it will only print text within text nodes, which means that it will not print the values of textareas and the like. Example:
<body>
<ul>
<!-- This is printed as the element contains a textnode -->
<li>Print me!</li>
</ul>
<div>
<!-- This is not printed because jsPDF doesn't deal with the value attribute -->
<input type="textarea" value="Please print me, too!">
</div>
</body>

Inserting CSS for an Element from a input field

Is there any easy way to take in a block of CSS from the user from an textarea and add this styling to the styling for a specific div?
See I'm creating a simple code preview tool like codePen, so far I have two textarea inputs, one for Html and one for CSS, as the user types in the Html input this updates the preview pane, this works, now I want to do it for CSS.
CSS textarea could contain a few blocks like:
h1 {
font-size:23px;
}
.myClass {
//Somestyle
}
Now I want this CSS to be contained in the
<div id="preview"></div>
So it doesnt effect the rest of the page, so a manual example would be
$('preview h1').css('font-size','23px');
Anyway to automate this?
Do it like this. Hope it works.
Add a style block for dynamic styling.
<style id="dynamicCss">
</style>
on the apply button click handler, set the style
$('#btnApplyStyle').click(function(){
$('#dynamicCss').html('').html($('#txtaCustomCss').val());
});
See the Fiddle here.
Please use developer tools to see the new style tag added to head section.
This script simply adds rule to the document. If you don't want that behavior, you can use this plugin in combination with my logic to set scope for rule. You will need to place the style tag inside of the container and add a scoped attribute to style for it to work. Please see the documentation.
If you want to use the iframe approach instead, you'll first need an HTML document to host inside of the iframe. The iframe document should be loaded for the same origin (protocol + domain) as the host document (cross-document cross-domain stuff is tricky otherwise). With your application, this is probably not an issue.
Host page:
<iframe id="preview" src="preview.html"></iframe>
To make things easier on yourself, this iframe document could load a script with convenience functions for injecting the HTML and CSS from the host.
preview.html:
<html>
<head>
<script src="preview.js"></script>
<style type="text/css" id="page-css"></style>
</head>
<body></body>
</html>
preview.js:
function setHTML(html) {
document.querySelector('body').innerHTML = html;
}
function setCSS(css) {
var stylesheet = document.querySelector('#page-css');
// Empty the stylesheet
while (stylesheet.firstChild) {
stylesheet.removeChild(stylesheet.firstChild);
}
// Inject new CSS
stylesheet.appendChild(document.createTextNode(css));
}
Now, from the host page, you can call these functions whenever your text inputs change:
document.querySelector('#preview').contentWindow.setCSS(someCSS);
This plugin may come in handy: https://github.com/websanova/wJSNova/downloads .
Edited
Insert the text of the rules in one of the existing cssStyleSheets you have.
It will be something like
window.document.styleSheets[0].insertRule("a{color:red;}",window.document.styleSheets[0].cssRules.length)
The first parameter is the rule to insert and the second is the index.
Fiddle
The only problem here is that this will affect all the DOM on the page maybe looking for a way to add the #preview before each css rule to get something like
#preview h1{}

Adding text to a speech bubbles in real time

I have an image that will form the background of an html page, and I want to superimpose speech bubbles over it. I've figured out how to make bubbles with css, and set their placement. But I cannot figure out how I will populate the bubbles (the div elements). Text messages will populate files, and I need to grab the strings and display them in the bubbles, refreshing the bubble content as messages come in. Any thoughts?
Assuming one of your bubbles contains a DIV which looks like this:
<div id="bubble1">This is the text</div>
You can use Javascript to easily change the text content. Using a JS library like jQuery is recommended. Here is a code example which changes the text:
<script>
$(document).ready(function()
{
$('#bubble1').text('This is the changed text'); // to change the text
$('#bubble1').html('This has <b>some</b> formatting'); // to change the html
});
</script>
Don't forget to include jQuery itself with a line like:
<script src="http://code.jquery.com/jquery-1.8.3.min.js"></script>
I couldn't understand where you are getting your strings from, if you let me know, I could update the answer.
If you are unfamiliar with jQuery, take a look here.
I think this will answer your question:
http://nicolasgallagher.com/pure-css-speech-bubbles/
Keep in mind that this is css3, so older browsers can have problems with that.

sharepoint 2010. Include javascript in code for all item display forms

I have javascript which can hide empty fields from sharepoint display form.
http://sharepointjavascript.wordpress.com/2009/10/15/hide-empty-rows-in-dispform/
I need to add programmatically this javascript to all display forms.
I dont know how to do it. Any ideas?
.each loops through all elements which matches a specific selector. If the code below is not sufficient, change the selector ("td.ms-formbody") such that your desired elements are matched.
$("td.ms-formbody").each(function(){ /* Should walk through all elements */
var val = $(this).text().replace(/\s|\xA0/g,'');
if($(this).parents().html().match('FieldName="#H#')==null){
if(val.length==0){
$(this).parents('tr:first').hide();
}
}
});
If you're still stuck, provide your HTML code, so that a more specific answer can be offered.
You can add a custom template file, overriding the ordinary DefaultTemplates.ascx (under ControlTemplates).
Create _NewTemplates.ascx file (empty). It should go under ControlTemplates as well
Copy all the Register stuff from the original ASCX
Add the ListForm template copied from DefaultTemplates.ascx (you might need to add a couple more template, depending on the list types you want to support)
Now edit the rendering template to add your JS
<SharePoint:RenderingTemplate ID="ListForm" runat="server"">
<Template>
--> add your code here
<script language="javascript">add functions or hook up enternal JS file</script>
--> continue original markup from this point
Save the file and run IISRESET, that's it

Is it possible to make a change with jQuery and then immediately reverse that change?

I have a pretty specific scenario where I would like to select all elements with jQuery, make a CSS change, save the elements, then reverse the change I made.
The Goal
I created a jQuery plugin called jQuery.sendFeedback. This plugin allows the user to highlight areas of the screen, as shown in this demo. When they submit their feedback the plugin grabs all the HTML on the page and dumps it into a callback function. Like so:
$('*').each(function ()
{
$(this).width($(this).width());
$(this).height($(this).height());
});
var feedbackInformation = {
subject: $feedbackSubject.val(),
details: $feedbackDetails.val(),
html: '<html>' + $('html').html() + '</html>'
};
if (settings.feedbackSent)
settings.feedbackSent(feedbackInformation);
The callback function accepts this feedback information and makes an AJAX call to store the page HTML on the server (this HTML includes the red box highlights the user drew on the screen). When someone from tech support needs to view the user's "screen shot" they navigate to a page that serves up the stored HTML so the developer can see where the user drew their highlights on the screen.
My original problem was that different screen resolutions made the elements different sizes and the red highlights would highlight the wrong areas as the screen changed. This was fixed pretty easily by selecting all elements on the page and manually setting their height and width to their current height and width when the user takes the snap shot. This makes all the element sizes static, which is perfect.
$('*').each(function ()
{
$(this).width($(this).width());
$(this).height($(this).height());
});
The Problem
The issue with this is that when the plugin is done transmitting this HTML the page currently being viewed now has static heights and widths on every element. This prevents dropdown menus and some other things from operating as they should. I cannot think of an easy way to reverse the change I made to the DOM without refreshing the page (which may very well end up being my only option). I'd prefer not to refresh the page.
Attempted Solution
What I need is a way to manipulate the HTML that I'm sending to the server, but not the DOM. I tried to change the above code to pull out the HTML first, then do the operation on the string containing the HTML (thus not affecting the DOM), but I'm not quite sure what I'm doing here.
var html = '<html>' + $('html').html() + '</html>';
$('*', html).each(function ()
{
$(this).width($(this).width());
$(this).height($(this).height());
});
This did not work. So either I need to be able to manipulate the string of HTML or I need to be able to manipulate the DOM and undo the manipulation afterward. I'm not quite sure what to do here.
Update
I employed the solution that I posted below it is working beautifully now. Now I am wondering if there is a way to statically write all the css for each element to the element, eliminating the need for style sheets to be referenced.
I think you are mostly on the right track by trying to make the modifications to the HTML as a string rather than on the current page for the user.
If you check this post, you might also want to follow the recommendation of creating a temporary <div> on the page, cloning your intended content to the new <div> ensuring it is invisible using "display:none." By also putting a custom Id on the new <div> you can safely apply your static sizing CSS to those elements using more careful selectors. Once you have sent the content to the server, you can blow away the new <div> completely.
Maybe?
After much pain and suffering I figured a crude but effective method for reverting my modifications to the DOM. Though I hadn't gotten around to trying #fdfrye's suggestion of cloning, I will be trying that next to see if there is a mroe elegant solution. In the meantime, here is the new code in case anyone else can benefit from it:
$('*').each(function () {
if ($(this).attr('style'))
$(this).data('oldStyle', $(this).attr('style'));
else
$(this).data('oldStyle', 'none');
$(this).width($(this).width());
$(this).height($(this).height());
});
var html = '<html>' + $('html').html() + '</html>';
$('*').each(function () {
if ($(this).data('oldStyle') != 'none')
$(this).attr('style', $(this).data('oldStyle'));
else
$(this).removeAttr('style');
});
When I'm looping through every element and modifying the css, I log the original value onto the element as data. After I assign the DOM HTML to a variable I then loop through all elements again and restore the style attribute to its original value. If there was no style attribute then I log 'none' to the element data and then remove the style attribute entirely when looping through again.
This is more performance heavy than I wish it was since it loops through all elements twice; it takes a few seconds to finish. Not horrible but it seems like a little much for such a small task. Anyway, it works. I get a string with fixed-sized HTML elements and the DOM goes back to normal as if the plugin never touched it.

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