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Web-Applications:TurboGears II
BCHB5242014
Lecture 26
12/03/2014 BCHB524 - 2014 - Edwards
12/03/2014 BCHB524 - 2014 - Edwards 2
Last time…
We made the empty HoyaTaxa website and learned how to make minor changes, and send dynamic content to template.
We added a “taxa” information page with: Clickable Parent link (Variable number of) clickable Children links
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Start web-app and check
Check that the web-application is working... In the class Command-Line shell:
[student@localhost ~]$ cd HoyaTaxa [student@localhost HoyaTaxa]$ start-hoyataxa.py
Start a web-browser and access by urls:http://localhost:8080/http://localhost:8080/taxa/9606http://localhost:8080/taxa?taxid=9606
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Empty landing page
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Taxonomy page
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Tour the primary filesThe files we modified in the HoyaTaxa folder: Controller:
hoyataxa/controllers.py Change the index method Add the taxa method to lookup and return Taxonomy given taxid
(Data) Model: hoyataxa/model.py
SQLObject classes devdata.sqlite
download (or populate) the data in the sqlite database View / Template:
hoyataxa/templates/welcome.html Remove all but the dynamic title
hoyataxa/templates/master.html Change header and footer, remove menus
hoyataxa/templates/taxa.html Set-up the taxa page layout
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List all names
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List all names
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Remove the scientific name
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Remove scientific name
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Let's add the lineage
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Let’s add the lineage
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Let’s add the lineage
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Empty landing page
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Set up search form
In controllers.py, define a class for the formfrom turbogears import validate, validatorsfrom turbogears import widgets, error_handler
class SearchFields(widgets.WidgetsList): query = widgets.TextField(label="Search Term") mode = widgets.SingleSelectField(label="Search Mode", options=["Starts with", "Ends with", "Contains"], default="Contains")
search_form = widgets.TableForm( fields = SearchFields(), action = "search", submit_text = "Search" )
class Root(controllers.RootController): @expose(template="hoyataxa.templates.welcome") def index(self): return dict(form=search_form, title="All your taxa are belong to us")
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Set up search form
Place the form in welcome.html
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Set up search form
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Handle the search request
In controllers.py, we add the search method
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Handle the search request
Save taxa.html as search.html and modify
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Handle the search request
Save taxa.html as search.html and modify
Search for name: gorilla
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But…
There is a problem. What to do about bad input?
Too short, spaces at beginning or end…
TurboGears provides validators to check values in the fields to make sure they are OK
Nice integration with form widgets Users get error messages so they can fix the
error
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Validation “Schema”
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Handle errors in search parameters
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Problem is communicated to user
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Problem is communicated to user
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Validators can be quite complicated
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Problem is communicated to user
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Setup for use by web-services
Our web-site can now be accessed programatically… …as we did with urllib.urlopen in python
Access:http://localhost:8080/taxa?taxid=9606
http://localhost:8080/search?query=hum&mode=Contains
However, we usually don’t want to parse HTML. Programs want to parse “easy” no-frills formats.
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Let’s provide XML output format
We need a new output template for search: searchxml.html
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XML output format
Next we need to tell the search method when to use it…
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XML Output Format
To get XML format output, add “&tg_format=xml” to end of URL.
Try it:
http://localhost:8080/search?query=hum&mode=Contains
http://localhost:8080/search?query=hum&mode=Contains&tg_format=xml
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Similarly for the taxa page
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Similarly for the taxa page
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XML Output Format
To get XML format output, add “tg_format=xml” to end of URL.
Try it:
http://localhost:8080/taxa?taxid=9606http://localhost:8080/taxa?taxid=9606&tg_format=xml
http://localhost:8080/taxa/9606http://localhost:8080/taxa/9606?tg_format=xml
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All done…
We can now display a taxonomy record nicely if the user types a URL ...and then navigate about its heirachy.
Can search the names based on a user query. Search form, list of matching results, etc...
XML output for web-services.
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TODO…
If only one matching search result – jump straight to taxa page… Even if only one taxa matches?
Search/lookup by taxid too? Make pages and tables prettier
Center and position tables on page Alternate row colors
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