128 lines
4.6 KiB
JavaScript
128 lines
4.6 KiB
JavaScript
|
|
/**
|
|
## IWC + JSON Example
|
|
Here, I will give a short overview on how to use the IwcJson Framework in Role-SDK widgets.
|
|
First you have to include the following libraries in your widget file:
|
|
```
|
|
<script src="http://open-app.googlecode.com/files/openapp.js"></script>
|
|
<script src="http://dbis.rwth-aachen.de/gadgets/iwc/lib/iwc.js"></script>
|
|
<script src="http://dbis.rwth-aachen.de/~jahns/role-widgets/widgetbundles/libraries/DUIClient.js"></script>
|
|
<script src="../dest/browser/Frameworks/JsonIwcYatta.min.js"></script>
|
|
<script src="./IwcJson.js"></script>
|
|
```
|
|
*/
|
|
function init(){
|
|
createConnector(function(Connector, user_id){
|
|
/**
|
|
yatta is the shared json object
|
|
*/
|
|
yatta = new JsonYatta(user_id, Connector);
|
|
|
|
/**
|
|
Add a integer-property like this
|
|
*/
|
|
yatta.val('x', 7);
|
|
|
|
/**
|
|
Get the value of property x like this
|
|
*/
|
|
console.log(yatta.val('x') === 7); // true
|
|
|
|
/**
|
|
A string property can be either mutable or immutable.
|
|
*/
|
|
yatta.val('mutable_string', "text", "mutable");
|
|
yatta.val('immutable_string', "text", "immutable");
|
|
|
|
console.log(yatta.val('immutable_string') === "text"); // true
|
|
yatta.val('mutable_string').insertText(2,"XXX"); // position, string
|
|
yatta.val('mutable_string').deleteText(0,1); // position, deletion length
|
|
console.log(yatta.val('mutable_string').val() === "eXXXxt"); // true
|
|
|
|
/**
|
|
You can omit the mutable - parameter. In that case the default will be used.
|
|
Initially the default is 'mutable'. You can set it like this:
|
|
*/
|
|
yatta.setMutableDefault('mutable');
|
|
// or
|
|
yatta.setMutableDefault('immutable');
|
|
|
|
yatta.val('new_string', "string");
|
|
console.log(yatta.val('new_string') === "string"); // true
|
|
|
|
/**
|
|
yatta is chainable:
|
|
*/
|
|
yatta.val('a', 4).val('b',5);
|
|
console.log(yatta.val('a') === 4); // true
|
|
console.log(yatta.val('b') === 5); // true
|
|
|
|
/**
|
|
You can alse set objects.
|
|
*/
|
|
yatta.val('object', {a : {b : "b"}, c : { d : 5 }});
|
|
console.log(yatta.val('object').val('c').val('d') === 5); // true
|
|
|
|
/**
|
|
Lists are always immutable.
|
|
*/
|
|
yatta.val('list', [1,2,3]);
|
|
console.log(yatta.val('list')[2] === 3); // true
|
|
|
|
/**
|
|
But there is a much more convenient way!
|
|
*/
|
|
console.log(yatta.value.list[2] === 3) // true
|
|
yatta.value.list = [3,4,5]
|
|
console.log(yatta.val('list')[2] === 5) // true
|
|
yatta.value.object = {c : 4}
|
|
console.log(yatta.value.object.c === 4) // true
|
|
|
|
/**
|
|
The downside is that you are only allowed to overwrite existing properties.
|
|
*/
|
|
yatta.value.newProperty = "Awesome"
|
|
console.log(yatta.value.newProperty !== "Awesome") // true, yatta.value.newProperty is undefined.
|
|
|
|
/**
|
|
So, how do we create new properties?
|
|
*/
|
|
yatta.value = {newProperty : "Awesome"}
|
|
console.log(yatta.value.newProperty === "Awesome") // true, it's awesome ;)
|
|
|
|
/**
|
|
This is stupid! I don't want to overwrite all my existing properties!
|
|
Very well.. The solution is that we merge yatta.value with the new assignment.
|
|
For example: assuming we want to overwrite yatta.value with some object o.
|
|
Then these two rules apply:
|
|
* The result has all properties of o
|
|
* The result has all properties of yatta.value if they don't occur under the same property-name in o
|
|
*/
|
|
yatta.value = {newProperty : {Awesome : true }}
|
|
console.log(yatta.value.list[2] === 5) // true, old value list still exists.
|
|
console.log(yatta.value.newProperty.Awesome === true) // true, newProperty is overwritten.
|
|
|
|
/**
|
|
Consider this case.
|
|
*/
|
|
yatta.value = {newProperty : { x : 4} }
|
|
console.log(yatta.value.newProperty.Awesome == null) // true, newProperty was replaced, therefore it is now undefined
|
|
|
|
/**
|
|
Did you notice that you always set immutable objects if you set properties like this?
|
|
Even if the default is 'mutable'. If you want to work with mutable objects you have to work with .val().
|
|
|
|
One last thing. You are only allowed to set properties like this `yatta.value = o`.
|
|
Yatta can't observe if you overwrite object references `yatta = "Awesome"`.
|
|
*/
|
|
w = yatta.value.newProperty
|
|
w = "Awesome"
|
|
console.log(yatta.value.newProperty !== "Awesome") // true, still not awesome..
|
|
|
|
/**
|
|
Please also read [JsonWrapper](https://rawgit.com/DadaMonad/Yatta/master/doc/class/JsonWrapper.html)
|
|
*/
|
|
})
|
|
}
|
|
window.onload = init
|