Hi I am stuck using the webinars on rhomobile.com: 'Using AsyncHttp to load data from JSON'. I followed the example and its working fine. The only problem i have is everytime AsyncHttp is called the same products are parse repeatedly. Is there a way to call AsyncHttp without reapeating these outputs?. Sample code will be appreciated.
Thanks
Hmm... you make a request to the same url repeatedly and get back the same results? Sounds like it's working to me.
If you want different results, you need to request from a different url, or more simply (if you're using that products example), you'll need to add or edit some product records.
The url seems to be open (http://rhostore.heroku.com/products), so you can just navigate to that page and simple create some new products using that web application.
Related
I have a task to implement but after some thought I don't really know from where to begin.
What I need to achieve:
Lets take as example BestBay web site. From my app I would like to create a certain query which will go/use to BestBay search type what I need and bring me the result. On my device I would like to show it as 10 views of the first items the website returned. For instance if I type "tvs" I will get a list of tvs so I would like to show this list on my device with the price and the link to the item (at least for the 10 first items).
I have experience with native apps(i didn't worked with web apps).
I can't use Best buy api.
I am not sure from where to begin.
I read about YQL.
I thought maybe to use the web page with the results as html and parse it to the objects I need.
Did anyone do something similar and can give me some starting point.
How to approach this kind of problem.
(tutorials/documentations/sample code something that can help me to start).
Tnx a lot.
In the end I decided to do it by HTML parsing:
parsing HTML on the iPhone
How to Parse HTML on iOS
I think I am mostly struggling with this problem because I do not know what to search for.
I want to make an app that allows the user to enter their gift card number and use that number to login to this website:
https://www.getmybalance.com
I have no idea how to do this without control over the website. Is it even possible to do so?
I don't want to use a UIWebView to show the page.
You should read up on NSURLConnection, you're going to have to execute a post request to login. Then you're going to have to determine whether or not you logged in successfully probably by parsing the returned page. NSURLConnection will handle storing the login cookie the site returns. After you've logged in you're probably going to need to execute another post request to query their system. Once again you will have to probably parse the result out of the HTML page that is returned.
NSURLConnection:
https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/nsurlconnection_Class/Reference/Reference.html
NSURLConnection Delegate Protocol:
https://developer.apple.com/library/mac/#documentation/Foundation/Reference/NSURLConnectionDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intf/NSURLConnectionDelegate
This all of course assumes that this website doesn't have an API you can use.
Looks like you need to programatically POST in https to the server, then you will get back some DOM document, or JSON, or some weird thing, which you then parse.
POSTing with iOS is pretty easy, look at something like LRResty https://github.com/lukeredpath/LRResty or similar.
When you get the data back, first thing to do is look at it with NSLog. Then if the data is HTML, you will need to wade into the HTML to get the result.
The problem with that approach is that the company hosting the page may change their API at any time. You should ask them to either not ever change anything (if they want to change, then make a new page and leave the old one working, or better, support a simple REST API - which would also help them build nice AJAX/html5 web sites in the future.).
We're looking to create a tool to help with time management in Redmine. The issue we are currently having is that we want to get a list of issues that are watched by a particular user but can't find an API for it. Does anyone know if this is possible or are we just going to have to try and modify Redmine directly?
SOLUTION: Similar to the solution provided below by dmf85, I found a solution to this problem that worked for me. The Issues API takes a query_id as one of its parameters. What I ended up doing was filtering my issues by Watcher (like dmf85 said) then saving the query. I then used the query_id from that saved custom query in my API call.
At least in Redmine 3.1, there’s an undocumented parameter for the Issues API that allows you to specify a watcher directly: watcher_id. It works just like assigned_to_id, you can pass either a user ID (i.e. watcher_id=23) or the special string me (i.e. watcher_id=me).
An example of URL could be like the following: https://example.com/redmine/issues.json?watcher_id=me&key=redmine_api_key
Under your issues tab in the interface, click:
add filter
watcher
select a watcher in the box
Then, click the atom, csv, or pdf link at the bottom for a link that you can write a program to consume at your discretion.
Does this help?
I'm having a hard time finding out where to start with this one. I pull information from an external website and put some of the content on my page. I think I need two things done. 1. A google search that takes the url of the top search given a name of my current object. 2. A way to examine the source of the result and output the information of a tag with a specific class.
To better explain this, I'll create a hypothetical situation: Say I have a website that lists mattresses and gives reviews. Say I want to add other websites reviews and in this website there's a tag like 3.5/5. Then I want to display this review along with a link to the external page. Is there a way to search the site like "site:http://mattressreviewsite/ #matress.name", pull that top url, and then search the source for the string "class='rating'" and display this in my view?
Thanks for any help or guidance. I'm using Rails 3.
You need an HTTP client (httparty, net/http-default) for that and do some parsing to get the required results.
Go study the url patterns of google (as far as I remember it was google.com?q=search_string) and use the http client for requests (get/post). Parse the result (there are many HTML parser gems available too) to get what you need and for any subsequent HTTP requests. And don't forget the 'I am feeling lucky' feature of google which returns only one result.
All the best!
On a Rails site, I'd like to display a certain Twitter feed, with pagination so the visitor can see previous tweets (as far back as needed).
I implemented it using the Twitter gem, using Search method, which has a nice pagination method, but hit a limitation that Twitter will only return the statutes from the last two weeks. So after going back a couple of pages, it won't fetch anymore.
I could use the user_timeline method, with max_id and then do my own pagination (passing the max_id of the last item viewed back to the controller to fetch the next batch).
Or, I could have a rake task that polls the Twitter feed frequently (with cron), and stores the tweets in the DB. The site would serve those up from the DB instead of querying Twitter at all.
Which would be the best or recommended method? I don't like having to store the Tweets in the DB, but that would also take care of the latency problem of querying Twitter (though I could use fragment caching to overcome that except that I haven't been able to get it working with Ajax).
Thanks for the advice.
I take the opposite view here, storing tweets in your database is not a good idea for a range of reasons.
you can never be sure that you got all the recently added tweets as a whole bunch could be added in quick succession. Sure, you can just make the cron job run more frequently, but then we get to the next problem.
if tweets are deleted, for whatever reason, your app will still cache them, which too me is not bad practice as they would have been removed for a reason.
To be honest, I would not have your app serve the tweets, but have a 'widget' (jquery or such) on the page which would love them once the page has loaded, and look at implementing some form of pagination there instead.
I'd go for storing the tweets in the database.
So even if twitter is offline you won't have some long load problems. You'll just rely on your database and the tweets will be appropriately displayed.
Only your background job will fail because twitter is unavailable. But that's not really a problem.
We download and store the tweets in a local database. I recently wrote a blog post about how we achieved this:
http://www.arctickiwi.com/blog/16-download-you-twitter-feed-using-ruby-on-rails-with-oauth
You can then use will_paginate to handle your pagination and go back as far as you want.