javascript - Polymer 1.0 Dom-if check with attribute -

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i want show template according attribute passed in element.

say 

 <template>     <template is="dom-if" if="[[!multiline]]">         ..     </template>     <template is="dom-if" if="[[multiline]]">         ..     </template> </template>

in properties pass

properties:{    multiline: {         type: boolean,         value: false     } }

and in html can pass multi-line attribute. how can achieve this? going in first one.

if add multi-line attribute in element outside of dom-bind template, evaluate true, regardless of value passed, though can set false not adding attribute @ on element or setting falsy value in js.


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