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POCapturing and handling json parse errors in FlexMobile Project using web services
 

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  1. POCapturing and handling json parse errors in FlexMobile Project using web services
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    <p>I have this FlexMobile Project that retrieves a cart array from a http web service. If the cart has no items in it, the json returned is empty, thus causing a parse error</p> <p>Here is the JSON response:</p> <pre><code>{ "cart": [ ] } </code></pre> <p>Here is the error:</p> <pre><code>Error: Error while Parsing at com.adobe.serializers.json::JSONDecoder/parseValue()[C:\opt\sb\ide_trunk\ide_builder\com.adobe.flexbuilder.dcrad\serializers\src\com\adobe\serializers\json\JSONDecoder.as:249] at com.adobe.serializers.json::JSONDecoder/parseArray()[C:\opt\sb\ide_trunk\ide_builder\com.adobe.flexbuilder.dcrad\serializers\src\com\adobe\serializers\json\JSONDecoder.as:431] at com.adobe.serializers.json::JSONDecoder/parseValue()[C:\opt\sb\ide_trunk\ide_builder\com.adobe.flexbuilder.dcrad\serializers\src\com\adobe\serializers\json\JSONDecoder.as:222] at com.adobe.serializers.json::JSONDecoder/parseObject()[C:\opt\sb\ide_trunk\ide_builder\com.adobe.flexbuilder.dcrad\serializers\src\com\adobe\serializers\json\JSONDecoder.as:339] at com.adobe.serializers.json::JSONDecoder/parseValue()[C:\opt\sb\ide_trunk\ide_builder\com.adobe.flexbuilder.dcrad\serializers\src\com\adobe\serializers\json\JSONDecoder.as:217] at com.adobe.serializers.json::JSONDecoder/decode()[C:\opt\sb\ide_trunk\ide_builder\com.adobe.flexbuilder.dcrad\serializers\src\com\adobe\serializers\json\JSONDecoder.as:178] at com.adobe.serializers.json::JSONSerializationFilter/deserializeResult()[C:\opt\sb\ide_trunk\ide_builder\com.adobe.flexbuilder.dcrad\serializers\src\com\adobe\serializers\json\JSONSerializationFilter.as:78] at mx.rpc.http::AbstractOperation/http://www.adobe.com/2006/flex/mx/internal::processResult()[E:\dev\hero_private_beta\frameworks\projects\rpc\src\mx\rpc\http\AbstractOperation.as:967] at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::resultHandler()[E:\dev\hero_private_beta\frameworks\projects\rpc\src\mx\rpc\AbstractInvoker.as:313] at mx.rpc::Responder/result()[E:\dev\hero_private_beta\frameworks\projects\rpc\src\mx\rpc\Responder.as:56] at mx.rpc::AsyncRequest/acknowledge()[E:\dev\hero_private_beta\frameworks\projects\rpc\src\mx\rpc\AsyncRequest.as:84] at DirectHTTPMessageResponder/completeHandler()[E:\dev\hero_private_beta\frameworks\projects\rpc\src\mx\messaging\channels\DirectHTTPChannel.as:451] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at flash.net::URLLoader/onComplete() </code></pre> <p>Here is the code I am using. This is my first attempt at a flex application, so expect newbie methods etc...</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;s:View xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:rincomobile="services.rincomobile.*" title="view_cart"&gt; &lt;fx:Script&gt; &lt;![CDATA[ import com.adobe.serializers.utility.TypeUtility; import mx.events.FlexEvent; import mx.rpc.events.FaultEvent; private function onFault( event : FaultEvent ) : void { trace(event.fault.message.toString()); } protected function list_creationCompleteHandler(event:FlexEvent):void { getCartResult.token = rincoMobile.getCart("getCart"); getCartTotalResult.token = rincoMobile.getCartTotal("getCartTotal"); } protected function getCartTotal(fuseaction:String):void { getCartTotalResult.token = rincoMobile.getCartTotal(fuseaction); } protected function getCartResult_faultHandler(event:FaultEvent):void { // TODO Auto-generated method stub trace("something happened"); } ]]&gt; &lt;/fx:Script&gt; &lt;fx:Declarations&gt; &lt;s:CallResponder id="getCartResult" fault="onFault(event)" /&gt; &lt;rincomobile:RincoMobile id="rincoMobile" /&gt; &lt;s:CallResponder id="getCartTotalResult"/&gt; &lt;!-- Place non-visual elements (e.g., services, value objects) here --&gt; &lt;/fx:Declarations&gt; &lt;s:List id="list" left="0" right="0" top="0" bottom="176" borderVisible="false" creationComplete="list_creationCompleteHandler(event)" itemRenderer="renderers.cartRenderer" labelField="item_code"&gt; &lt;s:AsyncListView list="{TypeUtility.convertToCollection(getCartResult.lastResult.cart)}"/&gt; &lt;/s:List&gt; &lt;s:Button id="btn_checkout" bottom="93" width="90%" label="${getCartTotalResult.lastResult.cart[0].total} Checkout" chromeColor="#091A33" horizontalCenter="0"/&gt; &lt;s:Button bottom="10" width="90%" label="Continue Shopping" chromeColor="#091A33" horizontalCenter="0"/&gt; &lt;/s:View&gt; </code></pre>
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