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Using HTML within a JSON Object

I'm working on an FAQ type project using AngularJS. I have a number of questions and answers I need to import into the page and thought it would be a good idea to use a service/directive to load the content in dynamically from JSON.
The text strings are quite unwieldily (639+ characters) and the overall hesitation I have is adding HTML into the JSON object to format the text (Line breaks etc).
Is pulling HTML from JSON considered bad practice practice, and is there a better way to solve this? I'd prefer to avoid using multiple templates but it's starting to seem like a better approach.
Thanks

If you're using AngularJS and already have a build step, html2js could help you with turning HTML templates into JS, which can then be concat'd and minified.

You could try parsing the incoming JSON before sending it to the page and just adding in a <br /> everywhere you run into a \n. That way the JSON is more universally usable if you ever decide you want to port the data to another medium.

Writing HTML layout/template within javascript bookmarklet

I have a bookmarklet which creates a UI for the user to interact with. Currently, I have been using $('<element>').addClass().css({..});, but that becomes hard to maintain. Is there a better way to do this?
I have also tried doing something like
var html = "<div class='someclass'>";
html += "<more html/>";
html += "</div>"
Which is also incredibly hard to maintain. Is there a way I can write html within javascript, or a library like jade that i can use WITHIN a javascript bookmarklet?

Yes, there is a Domain Specific Language implementation in JavaScript to allow you to write more expressive HTML in JavaScript called Pithy.
Please remember that writing large amounts in Pithy is maybe not a good idea and you rather want to use a proper client side templating engine such as DustJS or many others.

Using a webpage/web application to read and collect elements from XSL file

I have xsl page which include a number of templates cover all i need to create the webpages i want, i call the templates using nodes into another xsl file,
I need to call and collect the templates into a webpage instead of xsl using dropdown-lists.
How can i achieve that?
It seems not easy so any thoughts could help!
Thanks in advance!

I find it pretty tricky too and don't have a full answer for you.
Display the templates should be the easy part. You could catch them via XQuery, javascript as xml element from an xml file (the XSL stylesheet).
To call just some specific templates, I don't know...
One way to achieve your goal, is maybe using webServices to call xslTransform. You could do that easily with eXist for example (http://en.wikibooks.org/wiki/XQuery/XQuery_and_XSLT#Creating_an_XSLT_service). Exist embedded Webservices provide such functions (ie. calling XSLT inside web context). You have similar functionnalies in javascript (I guess...).
Maybe using XQuery (or anything else) to dynamically generate a simple template stylesheet (ie : extracting the template and create a XSLT file with only it inside) and execute it could be a solution.
Another way, may be using the mode attributes of templates. You could set an execution mode for a XSLT when launching it. But you may find yourself with one specific mode for each template...
Hope this could help.

what is the best architecture to show the frontend of a pure js app?

Basically, if you have a purely JS app (that get info from socket.io, or from a server with ajax request), and you need to show this data after processing it, what technique are you using?
Currently i'm creating the elements manually with code like
var myDiv = new Element('div',{ /* options */);
And injecting it where I need making all the DOM structure. I find this hard to maintain and especially for those designers that can code html, but they can't code html from JS.
Is there any way that will improve this process? Is it better to get the html from ajax? or just make html code in a string?
I'm looking for the most optimal in terms of maintenance and resources.

What you're looking for is a "template".
You have an HTML template (some divs, etc) and you bind this with the datas you provide in JS. Then, with whatever template engine you're using, you can get the full HTML.
Here are some template engines out there:
https://github.com/flatiron/plates
http://embeddedjs.com/
And a code sample using plates:
var Plates = require('plates'); // specific to node.js, see for client-side use
var html = '<div id="test">Old Value</div>';
var data = { "test": "New Value" };
var output = Plates.bind(html, data);
console.log( output ); // '<div id="test">New Value</div>'
You can store your templates either in a single file ("templates.html") loaded through ajax, or by storing it in the HTML page (not really recommended for maintenance matters).
If you store them all in an external file, you can do something like this:
templates.html:
<!-- text/html isn't parsed by the browser so we can put anything in it -->
<script type="text/html" id="template1">
<!-- put your template in there
</script>
And you can get its content through getElementById( 'template1' ).

Easiest way for you if project is in late stage to add something like jQuery.template plugin and create templates in separate files. Then, use backend to combine those peaces in single page and on DOM Ready fire up your client side app.
If your project is in early stage use AngularJs or BackboneJS frameworks. Believe me it is worth every cent :)

I would recommend you take a look at Backbone.js.
Backbone.js gives structure to web applications by providing models
with key-value binding and custom events, collections with a rich API
of enumerable functions, views with declarative event handling, and
connects it all to your existing API over a RESTful JSON interface
I use backbone even if I am not over a RESTful interface. It's pretty easy to separate the structure from the behavior ... You can achieve the same using jQuery but it wont be as neat and clean. It's one of the MV* framework. You have:
Models containing the interactive data as well as a large part of the logic surrounding it: conversions, validations, computed properties, and access control.
Collections are ordered sets of models.
Views: The general idea is to organize your interface into logical views, backed by models, each of which can be updated independently when the model changes, without having to redraw the page
Routers provides methods for routing client-side pages, and connecting them to actions and events
It's getting attention recently. Apps that were created using Backbone include:
FourSquare
LinkedIn for Mobile
This is a great resource if you're starting to work with Backbone.

Distal Templates http://code.google.com/p/distal/ :
<table id="a">
<tr><th>OPINIONS</th></tr>
<tr data-qrepeat="m keywords"><td data-qtext="m.name"></td></tr>
</table>
Then call:
distal(document.getElementById("a"), {
keywords: [
{name:"Brilliant"}, {name:"Masterpiece"}, {name:"Witty"}
]
});
will become:
<table>
<tr><th>OPINIONS</th></tr>
<tr><td>Brilliant</td></tr>
<tr><td>Masterpiece</td></tr>
<tr><td>Witty</td></tr>
</table>

And injecting it where I need making all the DOM structure. I find this hard to maintain and especially for those designers that can code html, but they can't code html from JS.
Another option is modest. As you can see from the documentation, it obviates the need for HTML chunks in javascript. The designers can change the HTML structure without needing to look at the javascript, and javascript coders can use parameters defined by the designers to fill in the data (all in javascript).
This example is from the readme:
HTML:
<div>
<contact>
<name>Casey Jones</name>
<phone>123-456-7890</phone>
</contact>
</div>
Javascript:
var contact = {
name : "Casey Jones",
cell : "123-456-7890"
};
var out = modest.render('contact',contact);

Best way to package multiple jQuery templates in single xHttpRequest?

Update: after another day of digging
into this issue, I have found that the
current jQuery template lib provides
no way to do this. this article
describes a good approach.
I would still like to hear of any
additional thoughts on doing this. The
article linked above requires that the
returned string of templates be
inserted into the DOM. Seems as though
leaving the DOM out of this would be
ideal, and less overhead on the
browser. Imagine a large page, with
multiple composite templates that may
not get used. Although, maybe because
the templates are wrapped in a script
tag, there is only a single DOM item per template? Come on, let's
hear some thoughts...
Using jQuery template libs, what's the best way to combine multiple, related, relatively small templates together? Do you need a single <script> tag for each individual template? What about in the case of dynamically pulling these templates via AJAX? Can I combine these templates somehow?
Consider the following:
<script id="movieTemplate" type="text/x-jquery-tmpl">
{{tmpl "#titleTemplate"}}
<tr class="detail"><td>Director: ${Director}</td></tr>
</script>
<script id="titleTemplate" type="text/x-jquery-tmpl">
<tr class="title"><td>${Name}</td></tr>
</script>
Now because these two templates are very closely related (and one depends on the other) it would make sense to consolidate these into a single AJAX call, and get them both at once. I have a few ideas, but I'd like to know if there is common/best way to do this? Currently I pull in a chunk of HTML, and then do a .find() to get the specific peice of HTML for a template... e.g.:
var templatePackage = fancyAjaxCalltoGetTemplates();
"templatePackage" might then look like this:
<div id="templatePkg">
<div id="movieTemplate">
{{tmpl "#titleTemplate"}}
<tr class="detail"><td>Director: ${Director}</td></tr>
</div>
<div id="titleTemplate">
<tr class="title"><td>${Name}</td></tr>
</div>
</div>
I could then do:
var titleTemplate = jQuery.template('titleTemplate', $(templatePackage).find('#titleTemplate') );
and
var movieTemplate = jQuery.template('movieTemplate', $(templatePackage).find('#movieTemplate') );
...let me know what you think... what would you do?

I like the referenced article in your update, except the assumption that you can't cache templates unless you insert them into the DOM. From the jQuery.tmpl documentation,
"To cache the template when using markup that is obtained from a string (rather than from inline markup in the page), use $.template( name, markup ) to create a named template for reuse. See jQuery.template()."
Using this, we can build a javascript template management system that allows us to load as many templates at a time as we need while keeping the DOM clean. On the client, keep a hash of template objects by name. You can use your favorite object based javascript pattern here, but I would think the structure could be like this:
templates[templateName] = {
templateMarkup: markupFromServer,
loadedAt: Date.now(),
compiledTemplateFunction: jQuery.template( templateName, markupFromServer )
}
Then use the templates to generate HTML like this:
templates['unique-name'].compiledTemplateFunction(inputData)
Then, build an unload mechanism to free up memory:
function unload(templateName) {
delete templates[templateName];
delete jquery.template[templateName];
}
Most importantly, you now have a method of storing multiple templates so you can make requests like: $.get('/TemplateManagement/Render', arrayOfTemplateNamesToLoad, loadManyTemplatesSuccess) to load multiple templates at a time. The only thing we need is a controller TemplateManagement that will take an array of template names as an input and return JSON that pairs a template name with its markup. There are a few ways to do this but it seems to me the most convenient is to define partial views for each template. In ASP.NET MVC 3, you can use this technique and RenderPartial to emit each template's markup into a JSON response. You can either name the partial views the same as the templates or map the names in some custom way.

OK, I read the article you reference in this post. As I see it, his way is probably one of the best ways to load up the template page(s). The only thing I don't like is the asynchronous problems that could crop up, esp. if you need to immediately do some templating before the async get returns... plus any binding issues that could happen before it returns something. In several projects I have done I use his "ancient" SSI (server side includes), but I just use something even easier like:
<% Response.WriteFile("this_page_template_file.html"); %>
You could put it anywhere where you'd place a tag. Like he says, just put in only the templates you need, or maybe include two templates: one is a "base" template with commonly-used items and the second one would have the page-specific ones with template references {{tmpl}}.
Is this even close to an answer? ;-)

[First off, great question. I love this topic]
I have no experience with the plugin "jquery-template-libs", but there is a particular lightweight javascript template plugins that are becoming almost a standard and plays very nicely with jQuery, which is probably better suited for the task than JTL, Mustache:
https://github.com/janl/mustache.js
It's got something that's called a "partial" which is essentially a way to include smaller templates within another one. Which sounds like it will help you out a lot.
On top of that there is a library called ICanHaz.js:
http://icanhazjs.com/
ICanHaz essentially extends Mustache to include built in functionality for templates and works incredibly well.
Mustache/ICanHaz allow you to add templates by variable, by a json call or by using tags. The choice is yours.

I know this is an old question but you might want to take a look at Closure-Templates. They provide the kind of functionality you're after with the added advantage of being compiled into JavaScript at compile-time instead of at run-time in each user's browser.
If you do decide to look into using them then I'd suggest using plovr for building them.