Polymer: How to access individual items in collection - data-binding

Question

I am creating a polymer element which shows a dropdown for selecting different div which we call sections here. On selection of an item in the dropdown the respective section should show up. You can consider this more like a tab control where instead of a tab header we have a dropdown control. I want to bind each section with the respective json object but using index like sections[0] and sections[1] is not working
<polymer-element name="my-elem">
<template>
<div class="sections">
<select on-change="{{sectionChanged}}">
<template repeat="{{ sections }}">
<option>{{ name }}</option>
</template>
</select>
<div id="section_0" class="section-config" bind="{{ sections[0] }}">
<div>{{ sec0Prop }}</div>
Just for simplicity I am showing only one div here. This div can actually be quite complex
</div>
<div id="section_1" class="section-config" bind="{{ sections[1] }}">
<div>{{ sec1Prop }}</div>
This section view will be different than that of section 0
</div>
</div>
</div>
</template>
<script>
Polymer('my-elem', {
sections: [{ sec0Prop: 'I am section 1 property' }, { sec1Prop: 'I am section 2 property' }],
showSection: function(index) {
$(this.shadowRoot.querySelectorAll('.section-config')).hide();
$(this.shadowRoot.querySelector('#section_' + index)).show();
},
sectionChanged: function(e) {
this.showSection(e.target.selectedIndex);
}
});
</script>
</polymer-element>
Assume jquery is used.
Can you please help me with how to bind to individual items in a collection when we cannot use repeat in template as the view for each item is different?

Answer 1

You have id. So best way to get item: this.$['section_' + index]. Why you don't use 'core-pages'? With 'core-pages' you can do it without js.