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From Dejan Bosanac <dejan.bosa...@ttmsolutions.com>
Subject Re: Where the Message object (javascript) of amq.js is defined ?
Date Wed, 22 Oct 2008 13:25:22 GMT
Hi Charles,

stock portfolio example sends XML in a text message to the Ajax client.
Therefore, you'll get the response like this (full body).

<ajax-response>
<response id='stocks' destination='topic://STOCKS.*' ><price
stock='BEAS' bid='94.08395193508605' offer='94.17803588702112'
movement='up'/></response>
</ajax-response>

the "message object" you see is just the <price ... /> xml text and
getAttribute() is JavaScript way of handling XML tag attributes.
So, there is no "definition" of message object, it's just what you send
to the broker; text if it is a TextMessage or object.toString in case of
object message.

Also you can find _amq.js which contains the whole Ajax JavaScript logic
here

http://svn.apache.org/viewvc/activemq/trunk/activemq-web/src/main/resources/org/apache/activemq/web/_amq.js?view=markup

Cheers

-- 
Dejan Bosanac


http://www.ttmsolutions.com - get a free ActiveMQ user guide

ActiveMQ in Action - http://www.manning.com/snyder/
Scripting in Java - http://www.scriptinginjava.net




cmoulliard wrote:
> Hi,
>
> Additional question : What is the javascript class of the message returned
> (DOM, XMLHTTPResuest, ....) ?
>
> The existing doc does not help us because in the two example, we saw that we
> can use message.getAttribute or message.getChildNodes[0], ... ?
>
> KR,
>
> Charles Moulliard
>
>
> cmoulliard wrote:
>   
>> Hi,
>>
>> I would like to know where the javascript object Message used by
>> AJAX/ActiveMq in a HTML page is defined ? I see in the portfolio example
>> that we can use the following method "message.getAttribute('stock')" to
>> access part of the xml message returned by the queue engine through the
>> MessageListenerServlet but I would like to know what are the methods /
>> variables available for this message object (which is normally a mirror of
>> the jax.jms.Message object) ?
>>
>> To be more precise, here is a copy/paste of the portfolio.js script of the
>> example where message appears at the line _price: function(message)
>>
>> var priceHandler = {
>>   _price: function(message) {
>>     if (message != null) {
>>       var price = parseFloat(message.getAttribute('bid'))
>>       var symbol = message.getAttribute('stock')
>>       var movement = message.getAttribute('movement')
>>       if (movement == null) {
>> 	        movement = 'up'
>>       }
>> 	    
>>       var row = document.getElementById(symbol)
>>       if (row) {
>> 		    // perform portfolio calculations
>> 		    var value = asFloat(find(row, 'amount')) * price
>> 		    var pl = value - asFloat(find(row, 'cost'))
>> 		    
>> 		    // now lets update the HTML DOM
>> 		    find(row, 'price').innerHTML = fixedDigits(price, 2)
>> 		    find(row, 'value').innerHTML = fixedDigits(value, 2)
>> 		    find(row, 'pl').innerHTML    = fixedDigits(pl, 2)
>> 		    find(row, 'price').className = movement
>> 		    find(row, 'pl').className    = pl >= 0 ? 'up' : 'down'
>>       }
>>     }
>>   }
>> };
>>
>> function portfolioPoll(first)
>> {
>>    if (first)
>>    {
>>      amq.addListener('stocks','topic://STOCKS.*',priceHandler._price);
>>    }
>> }
>>
>> amq.addPollHandler(portfolioPoll);
>>
>> Remark : addtiaional question
>> - Who will cal the function portfolioPoll(first) function ?
>> - How is the parameter first which is a boolean setted ?
>>
>> KR,
>>
>> Charles Moulliard
>>
>>     
>
>
> -----
> Enterprise Architect
>
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>
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>
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>   



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