Friday, June 27th, 2008
Working with Web Services with ease; dojo.data and the WikipediaStore
Category: Dojo
His example shows building access to Wikipedia (demo):
Dojo recently received a new data store that demonstrates exactly what we want: dojox.data.WikipediaStore. It does just what it sounds like, turning Wikipedia into a simple object you can query from your code. Building it with Dojo’s handy dojox.rpc package makes for a simple, compact, DRY implementation.
In only four steps:
- Create the web service object
- Declare the new data store, inheriting from ServiceStore
- Give it a fetch method
- Give it a _processResults method
The service descriptor looks like:
JAVASCRIPT:
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{
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"SMDVersion": "2.0",
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"id": "http://en.wikipedia.org/w/api.php",
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"description": "Wikipedia API",
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transport: "JSONP",
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envelope: "URL",
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additionalParameters: true,
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target: "http://en.wikipedia.org/w/api.php",
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parameters: [
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{ name: "format", optional: false, "default": "json" }
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],
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services: {
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query: {
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parameters: [
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{ name: "action", type: "string", "default": "parse" }
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]
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}
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}
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}
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which you can use when you create the store:
JAVASCRIPT:
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dojo.require("dojo.io.script"); // for cross domain JSONP
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dojo.require("dojox.rpc.Service");
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dojo.addOnLoad(function(){
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var mu = dojo.moduleUrl("dojox.rpc.SMDLibrary", "wikipedia.smd");
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var wikipedia = new dojox.rpc.Service(mu);
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wikipedia.query({
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action: "parse",
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page: "Main Page"
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}).addCallback(this, function(article){
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dojo.body().innerHTML = article.parse.text["*"];
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});
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});
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