polymer data binding

[sag...@126.com]

why in polymer older version we can direct to binding property value use other element like "{{$.core_input.value}}",but  in polymer 2.0 impossible.impossible.

 <core-input willvalidate placeholder="Type something..." inputvalue="wwwwwwwww" value="wwwwwwwww" id="core_input"></core-input>

    <core-input willvalidate placeholder="Type something..." inputvalue="{{ $.core_input.value }}" value="{{ $.core_input.value }}" id="core_input2"></core-input>

[Daniel Llewellyn]

Use a proper variable when binding:

—

<core-input id=“core_input” value=“{{core_input_value}}”></core-input>
<core-input inputvalue=“[[core_input_value]]”></core-input>

—

Alternatively use a computed binding:

—

<core-input id=“core_input” value=“foo”></core-input>
<core-input inputvalue=“[[core_input_value()]]”></core-input>

class your_component extends Polymer.Element {
// fill the rest yourself per standard patterns

core_input_value() {
return this.$.core_input.value;
}
}

—

Regards,
Daniel Llewellyn.