I need two paginations on one page, is it possible to do this with codeigniter?!? Of course they must operate independently of one another.
Yes and no. If you want two different pagination visuals (customized renderings of the library) then sure. The problem you'll run into is by default the pagination library will pull the current page out of your $ci->uri->segments() list automatically to determine which page to mark as "active".
I do not know of a way to explicitly override this. Perhaps if you made a MY_Pagination that took an additional $config value for current page you could get it to behave like that. I haven't looked at the library's code in a while so you'd have to do some digging.
Honestly though, I'd suggest you build your own, it's not incredibly hard to do some simple math to determine what numbers to link.
Also you'll run into issues with CI's Pagination Library if you want the "current page" part to be NOT the last segment in your url. This may have been fixed lately but last time I looked it was the stop-gap for me using the library all together.
Bottom Line Invest the time in making your own if you want more than it's basic functionality, it's simple enough, just make yours reusable if you can.
Related
I need to create a universal web scraper to parse articles on the different websites. Of course, I know about XPath, but I want to try to make it universal for any website despite the HTML markup of a page.
I need to determine whether there is an article on the page and if it is - parse a text of title, body and tags (if exists).
Frankly speaking, my knowledge in DS is not very huge, but I assume this task (determine whether it is article, and parsing only needed parts) is possible to solve.
What tools should I use? Any help?
Actually, for the second task, I need to implement something similar that google chrome mobile does. When page is not optimised for mobile, then propose to show the page in adaptive mode (just title, and main content).
If you are using Python, some libraries to look at are:
scrapy, which scrapes data and can extract some of the results) and,
BeautifulSoup, which is more geared towards the extraction part itself.
It is possible to request a version of a website (e.g. for Chrome, Safari, Mobile, old-school systems) by creating a custom header for your scraper.
HAve a look at the relevant documentation, and you can get an idea of how to use headers in scrapy here.
I do not know of any more specialised tools. Your tasks are more analytical and are typically not performed with the use of models for estimating e.g. what content is where on a webpage. This might be an intersting research direction though; to see if you can create a model that generalises across many websites to extract the desired content.
That leads me on to my last point, which is to say that creating a single scraper that works for any website *containing your artile type) is not usually possible. People create websites differently, however they see fit, which means they also change them. This usually leads to a good scraper requiring constant updates as time (and developers) moves on.
EDIT:
Then if you have lots of labelled examples, it might be possible to train a model. The challenge might be the look-back range of the model. For example, a typical LSTM model is given a parameter that tells it how far to look back into the past. It is stored within its memory internally. In your case, you might be looking for a start and end HTML tag of an article, to then extract just that part. These tahs could be thousands of words apart. Something a standard LSTM might not be fit to retain and use.
If you could pose your problem a little differently, then there are other approaches that might be plausible. E.g., you could make it a "question-answer" problem, by saying: I have this HTML, where is the article content? If that sounds ok for your use-case, have a look here for some model based approaches.
I want to make the editor experience better and more visually pleasing when filling in content on a page (In all properties view). Could be a simple divider or a heading..
I am already using tabs, whenever it makes sense. Also, I have been experimenting with using blocks as properties. This adds a nice separation with at clear heading, but it is so much more code to maintain and a bit of a mess to be honest when the properties truly belong to the page type.
Out-of-the-box, it is not possible to decorate properties with headlines, unless you use block-properties, as you mention yourself.
However, I thought your question was quite interesting, and I discovered that extending Episerver to accommodate this behavior is surprisingly easy. I have written an example solution, which you're free to use as you like: https://arlc.dk/grouping-properties-with-headlines-without-property-blocks.
If you dislike the solution, an alternative approach would be to introduce your own Property-type (Headline), and create a 1) a custom dojo-widget to simply display a headline, and 2) an EditorDescriptor to set the ClientEditingClass.
Linus wrote an excellent blog post on this here: https://world.episerver.com/blogs/Linus-Ekstrom/Dates/2012/7/Creating-a-custom-editor-for-a-property/.
EDIT:
I see, I have skipped too quickly over the overriding part.
You don't have to override any files by replacing them, and you won't have to extract Shell.zip (unless you're curious how Episerver has implemented their widgets). The part that overrides the specific component is define("epi/shell/form/Field". As long as your definition of this widget is loaded after shell, dojo will use your implementation, whenever something is requiring "epi/shell/form/Field". The thing that ensures your implementation is loaded after, is in module.config, under 'This injects our field-implementation [...]'.
The path ~/ClientResources/Scripts/Shell/Field/Field.js is simply the location I have chosen to put the overriden version of Field.js. You can put it wherever you like, as long as you update module.config accordingly, with the new path.
It works like this: First, Episerver defines widget A. Then you define a widget with the same name, A. When anything tries to fetch A, it returns your implementation, rather than Episerver's.
I am trying to create a new GUI element within DrRacket's text window, like picts or syntax objects. As far as I can tell, the most standard way of doing this is with a snip%.1
Unfortunately, the documentation for creating new snips, while comprehensive, is a bit impenetrable and leaves some questions to be answered.
For starters, what is the difference between a snip% and a snip-class%? Why do these need to be separated out into two classes, rather than simply being combined into one class? Is it because multiple snips will use one snip class?
Second off, what is snip-reader<%>? Not only why does it need to be a separate class, but why is the module providing it supposed to be installed?2 If it does need to be a new class, why can't it just be referred to directly. Why go through this whole process of constructing and then parsing a string of the form: "(lib ...)\n(lib ...)"?
I mean, there might now be any reason for this design, and it might just be a remnant of an old API. If so, has anyone thought of making a new more consistent API? Or if there is a reason for this design, can you please tell me what it is, as the docs don't seem to make that clear.
I mean, as of right now, I can copy/paste the sample given in the docs on creating a new snip. But I'm having a hard time understanding the design going on here, so I can use them properly.
1I know there are other ways to do it, but I also want to have interactive buttons and whatnot.
2I know it doesn't need to be installed as a library per se, but the documentation seems to strongly push you in that direction.
Okay, I think I finally found the answer. Broadly speaking:
The snip% class includes the methods for drawing the snip, telling the editor how much space to reserve for the picture, and handling events such as mouse clicks.
Next, the snip-class% class is used for encoding and decoding snips. This must be a separate class because when saved to a file, the editor needs to encode what type of snip it is, and for obvious reasons it can't just put the literal snip% class in there. The value it stores in the file is the snip-class%'s 'class name'. This can be anything, and as long as the editor has the classname associated to a snip-class%, it can be loaded. Additionally, if it is of the form "(lib ...)" or "(lib ...) (lib ...)" Racket will just automatically load it into the list for you.
Nothing 'needs' to be installed per se, its just the easiest way to go about it. Otherwise you manually need to tell the editor how to handle the snip before actually loading the file.
Here's what I'd like to do with Lift: I want to build a dynamic shopping cart, with lines able to be added and removed via AJAX calls. The total needs to be wired to the specific lines. Each line would include a number, the length of time for a lease, and a calculated price based on that, so I would have to add wired cells on each addable/removable line as well. So it would look something like this:
Number Length of Lease Price Remove?
(AJAX Textbox) (AJAX Dropdown Select) (Plain Updateable Text) (Ajax Checkbox)
(Another Row)...
+ Add
Total: ______
The problem I'm running into is that I can find resources to build a static page that displays all of this via Wiring. Using the Lift Demo site, I can pull up code that will let me add new lines, but it doesn't seem to me to be conducive to removing lines (this in general is one of my frustrations with Lift at the moment: a "little extra detail" to change from a tutorial ends up requiring me to completely change tacks and spend hours more at work and research, and I want to figure out how I'm probably approaching these problems wrongly!). Alternatively, I can use CSS selectors to dynamically create content, but I don't know how to effectively wire these together.
In addition, all of my attempts end up creating 2-3 times the amount of code I would have written to simply do some JQuery updates on the page, so I suspect that I'm doing something wrong and overcomplicating everything.
What resources would people recommend to set me on the right path?
These are your best resources for learning Lift:
Simply Lift
Lift Cookbook
Lift in Action
For any specific questions, I highly recommend you join us at the Lift Community Google Group. It is the official support channel for Lift. Although a few of us occasionally help out here at Stackoverflow, the best Lift help can be found there.
Is it possible to make a 2.5 component without using TableHelloWorld class and all that field type stuff like from here. Or is it compulsory?
http://docs.joomla.org/Developing_a_Model-View-Controller_Component/2.5/Using_the_database
The system will function without it fairly well actually. All you actually need to get something running is a base file named after your component, a controller.php file, and the view as outlined in this section: http://docs.joomla.org/Developing_a_Model-View-Controller_Component/2.5/Adding_a_view_to_the_site_part
From that you will get something that runs and loads. And if you choose you can just make raw sql queries to the database.
That being said, the framework is there to help you, not to hinder you. I've cut a lot of corners over the years, and almost always you end up regretting it later. Feel free to play around with skipping the pieces, but just remember that there are pieces out there that can help you with all kinds of important things that you may not think you need right now. (Binding input, table row hierarchies, and check-in/check-out functionality are just a few that come to mind that I'm glad I didn't have to make myself.)