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Amruta

On Monday, March 10, 2014 5:42:38 PM UTC-4, Scott Miles wrote:
>
> >> But the library throws an exception since it is expecting a native 
> version of the div and instead gets a wrapped one
>
> This is the key moment. We need to know what the library is trying to do 
> that is not supported by the wrapper.
>
> Trying to 'unwrap' the wrapper is absolutely the last resort, and usually 
> causes more trouble that it's worth. I know this from personal experience. 
> =P
>
> Scott
>
>
> On Mon, Mar 10, 2014 at 2:35 PM, <[email protected] <javascript:>> wrote:
>
>> Hello,
>>
>> I am working on a project in which I am supposed to construct a graph 
>> with several nodes and edges using Polymer and Platform. I am using an 
>> underlying library which is developed in-house by my company which is not 
>> based on Polymer. This library contains functions for creating nodes, 
>> initializing graph etc.I have created a custom element called graph. 
>> Following is the declaration of this element:
>>
>> <pre>
>> <polymer-element name="cmp-graph" attributes="canvas" 
>> constructor="CMPGraph">
>>
>> <template> 
>>           <div id="graph_win_placeholder">
>>             <div id="graph_win" class="canvas">
>>                 <div id="graph_canvas" class="graph-area">
>>                 </div>
>>             </div>            
>>           </div>
>> </template>
>>
>> </polymer-element>
>> </pre> 
>>
>> In Javascript I call a function of the library to initialize the graph. 
>> This function call needs a handle to the canvas div (the div with 
>> id="graph_canvas"). So I pass this.$.graph_canvas as a parameter while 
>> making the function call. But the library throws an exception since it is 
>> expecting a native version of the div and instead gets a wrapped one since 
>> this.$.graph_canvas corresponds to the wrapped version of the div and not 
>> the actual native one. So I tried to unwrap this.$.graph_canvas. Now the 
>> next problem comes into picture when the library is trying to create some 
>> DOM elements using document.createElement .document.createSVGElement etc. 
>> Now these elements that are created by the library are wrapped (since 
>> platform.js and polymer.js are already loaded) and the library again throws 
>> an error.
>> So inorder to solve this problem, I passed shadow=native as a parameter 
>> in the query string and everything works fine. The library is happy and so 
>> is my code. 
>>
>> But now the problem is, my application can run only on Chrome and Opera 
>> since other browsers do not have the native support for Shadow DOM. Is 
>> there any other way to solve this problem?
>>
>> Any help will be appreciated.
>>
>> Thanks. 
>>
>> Follow Polymer on Google+: plus.google.com/107187849809354688692
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>
>

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