String concatenation is not supported inside a tag, and the tag can’t contain any whitespace:

[toduu]

String concatenation is not supported inside a tag, and the tag can’t contain any whitespace.   This limitation is hampering.

The moment you do auto format in an ide like eclipse the whole thing gets messed up because spaces get inserted.  

All the function writing one has to do to overcome this limitation also adds more javascript to the code.

Also I was unable to pass data binding to a function.

e.g.  I have a iron-list with items which are paper-cards that have paper-button  .   While setting id based on a function works passing it to another function validate fails ...  

Any suggestions?

<iron-list id="alist" as="item" indexAs="index" auto>
<template>
<a-card que="[[item]]" index="[[index]]"></a-card>

</template>

</iron-list>

<dom-module id="a-card">

...

<paper-card >

   <div  class="card-content">

    <paper-button raised id="{{_ans('W',que)}}" on-click="validate({{_ans('W',que)}})">

..

<paper-card >

    <script>

       Polymer({

           is : 'a-card',

           properties : {

               que : Object

           },

           _ans : function(ans, que) {

               return 'xx_' + ans + que.queNum;

           }

        });

        function validate(option) {

           console.log(option);

       };

    </script>

[Daniel Freedman]

Arguments to functions in data-binding must be the names of data-bound properties: https://www.polymer-project.org/1.0/docs/devguide/data-binding.html#annotated-computed

I'd also suggest not trying to change the id or on-click bindings like that, but instead place a new attribute on paper-button with your computed binding.

Then the "validate" function can be a lot simpler: http://jsbin.com/baxucesusa/edit?html,console,output

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