help with DWR returning large string from server to Browser

[Bingjin He (bihe)]

Hi There,

I am using DWR to return JAVA object to javascript. In this case, I am reading from a log file, and return the log contents to be dispalyed in the textarea inside a browser. I have no problem with this approach when the log file size is small. But when the size is big(~1M), my browser hangs. I suspect DWR can not handle returning big size object from Java to browser. Can anyone confirm this and suggest alternatives?

 

thanks in advance

--bingjin 

[David Marginian-2]

Bingjin,
   This is not really a DWR issue it is a browser issue.  The fact is
all DWR can do is send data to the browser and set the value on a text
field.  Browser's were simply not designed to handle large amounts of
data.  To illustrate this try creating a simple html file with a
textarea field.  Dump 1.5 megs of static data into the textarea and see
how the browser reacts.  IE will choke for several seconds.  There is
more overhead when using DWR (because we have the data in memory and
have to set the textarea's value). which is why it is slower but not
much can be done about that.

   Whenever you think you need to display this much data in the browser
you probably need to re-think your design.  I don't know your specific
situation but chances are you don't need to display the entire log
file.  I would create a list box on the page with several options (last
500, last 1000, last 1500, first 500, first 1000, etc.) and allow the
user to choose a value.  Then I would read the log file according to the
options selected and only return the data read.  I would limit the
options to those that perform reasonably well.  I have done this before
in a similar situation (displaying log files).


Bingjin He (bihe) wrote:

> Hi There,
> I am using DWR to return JAVA object to javascript. In this case, I am
> reading from a log file, and return the log contents to be dispalyed
> in the textarea inside a browser. I have no problem with this approach
> when the log file size is small. But when the size is big(~1M), my
> browser hangs. I suspect DWR can not handle returning big size object
> from Java to browser. Can anyone confirm this and suggest alternatives?
>  
> thanks in advance
> --bingjin

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[Bingjin He (bihe)]

Thanks David!! I re-designed the display and get around this problem.
Appreicate your prompt help!
--bingjin

> -----Original Message-----
> From: David Marginian [mailto:david@...]
> Sent: Thursday, June 05, 2008 1:01 AM
> To: dev@...
> Subject: Re: [dwr-dev] help with DWR returning large string
> from server to Browser
>
> Bingjin,
>    This is not really a DWR issue it is a browser issue.  The
> fact is all DWR can do is send data to the browser and set
> the value on a text field.  Browser's were simply not
> designed to handle large amounts of data.  To illustrate this
> try creating a simple html file with a textarea field.  Dump
> 1.5 megs of static data into the textarea and see how the
> browser reacts.  IE will choke for several seconds.  There is
> more overhead when using DWR (because we have the data in
> memory and have to set the textarea's value). which is why it
> is slower but not much can be done about that.
>
>    Whenever you think you need to display this much data in
> the browser you probably need to re-think your design.  I
> don't know your specific situation but chances are you don't
> need to display the entire log file.  I would create a list
> box on the page with several options (last 500, last 1000,
> last 1500, first 500, first 1000, etc.) and allow the user to
> choose a value.  Then I would read the log file according to
> the options selected and only return the data read.  I would
> limit the options to those that perform reasonably well.  I
> have done this before in a similar situation (displaying log files).
>
>
> Bingjin He (bihe) wrote:
> > Hi There,
> > I am using DWR to return JAVA object to javascript. In this
> case, I am
> > reading from a log file, and return the log contents to be
> dispalyed
> > in the textarea inside a browser. I have no problem with
> this approach
> > when the log file size is small. But when the size is big(~1M), my
> > browser hangs. I suspect DWR can not handle returning big
> size object
> > from Java to browser. Can anyone confirm this and suggest
> alternatives?
> >  
> > thanks in advance
> > --bingjin
>
>
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>
>

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[David Marginian-2]

Great.  You're welcome.

Bingjin He (bihe) wrote:

> Thanks David!! I re-designed the display and get around this problem.
> Appreicate your prompt help!
> --bingjin
>
>  
>> -----Original Message-----
>> From: David Marginian [mailto:david@...]
>> Sent: Thursday, June 05, 2008 1:01 AM
>> To: dev@...
>> Subject: Re: [dwr-dev] help with DWR returning large string
>> from server to Browser
>>
>> Bingjin,
>>    This is not really a DWR issue it is a browser issue.  The
>> fact is all DWR can do is send data to the browser and set
>> the value on a text field.  Browser's were simply not
>> designed to handle large amounts of data.  To illustrate this
>> try creating a simple html file with a textarea field.  Dump
>> 1.5 megs of static data into the textarea and see how the
>> browser reacts.  IE will choke for several seconds.  There is
>> more overhead when using DWR (because we have the data in
>> memory and have to set the textarea's value). which is why it
>> is slower but not much can be done about that.
>>
>>    Whenever you think you need to display this much data in
>> the browser you probably need to re-think your design.  I
>> don't know your specific situation but chances are you don't
>> need to display the entire log file.  I would create a list
>> box on the page with several options (last 500, last 1000,
>> last 1500, first 500, first 1000, etc.) and allow the user to
>> choose a value.  Then I would read the log file according to
>> the options selected and only return the data read.  I would
>> limit the options to those that perform reasonably well.  I
>> have done this before in a similar situation (displaying log files).
>>
>>
>> Bingjin He (bihe) wrote:
>>    
>>> Hi There,
>>> I am using DWR to return JAVA object to javascript. In this
>>>      
>> case, I am
>>    
>>> reading from a log file, and return the log contents to be
>>>      
>> dispalyed
>>    
>>> in the textarea inside a browser. I have no problem with
>>>      
>> this approach
>>    
>>> when the log file size is small. But when the size is big(~1M), my
>>> browser hangs. I suspect DWR can not handle returning big
>>>      
>> size object
>>    
>>> from Java to browser. Can anyone confirm this and suggest
>>>      
>> alternatives?
>>    
>>>  
>>> thanks in advance
>>> --bingjin
>>>      
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>> To unsubscribe, e-mail: dev-unsubscribe@...
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>>
>>
>>    
>
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>  

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