How do I bind Polymer property in setTimeout? - polymer

Question

I have a Polymer property defined as:
properties: {
delay: {
type: Timeranges,
value: '5000'
}
}
And I use this property as a timeout like this:
setTimeout(function() {
request = ajax(request, custParams, inputValue.trim(), input, result, component.subType, component.queryParams);
}, "{{delay}}");
But this is not working. If I specify a literal number as a function argument instead of "{{delay}}", it works fine. How do I bind delay here?

Answer 1

The property type should be Number (not Timeranges).
Polymer's data binding syntax can only be used in HTML (not JavaScript). Your current code passes a literal string to setTimeout() instead of the numeric value of delay.
Assuming setTimeout() is called from your Polymer object definition, you would use this.delay like this:
Polymer({
properties: {
delay: {
type: Number,
value: 5000
}
},
foo: function() {
setTimeout(function() {...}, this.delay);
}
});
If you need setTimeout() to be called whenever delay changes, you would use an observer like this:
Polymer({
properties: {
delay: {
type: Number,
value: 5000,
observer: '_delayChanged'
}
},
_delayChanged: function(newDelay) {
setTimeout(function() {...}, newDelay);
}
// ...
});