聚合物dom-如果不起作用

Question

I have this template dom-if using Polymer 1.X, and it is not working.

It is supposed to display 'Loading' when requirement.allLoaded is false and display the real content when requirement.allLoaded is true .

I switch the state of this variable in my test function. But it doesn't take effects.

 //Properties requirement: { type:Object, value: { allLoaded: false, tagsLoaded: false } } //Test function _testButton: function(){ console.log(this.requirement); this.requirement.allLoaded = !this.requirement.allLoaded; console.log(this.requirement); }, 

 <div id="modal-content"> <template is="dom-if" if={{!requirement.allLoaded}}> <p>Loading</p> </template> <template is="dom-if" if={{requirement.allLoaded}}> <iron-pages selected="[[selectedTab]]" attr-for-selected="name" role="main"> <details-tab name="details"></details-tab> <bar-chart-tab name="barchart"></bar-chart-tab> <live-data-tab name="livedata" shared-info='{{sharedInfo}}'></live-data-tab> </iron-pages> </template> </div> 

Note: I already used this structure to display/not display things in other project (with Polymer 2) and it was working.

Answer 1

Is it only the change that does not work? Ie it shows correctly on load?

Try notifying Polymer of the change: this.requirement.allLoaded = !this.requirement.allLoaded; this.notifyPath('requirement.allLoaded'); this.requirement.allLoaded = !this.requirement.allLoaded; this.notifyPath('requirement.allLoaded');

Answer 2

You could also use this.set('property.subProperty', value) for Observable Changes .
In your case, that's this.set('requirement.allLoaded', !this.requirement.allLoaded);