[AngularJS] Using $parse Service
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$parse is useful when you want to parse an expression and the context is not defined yet.
For example, I have a table component which allows user to pass in all the row items and define action for each row.
<
ttmd-table
items
="vm.invoices"
headers
="vm.headers"
>
<
ttmd-actions
>
<
ttmd-action
if
="shouldPay"
text
="pay"
on-click
="vm.pay(payload)"
></
ttmd-action
>
</
ttmd-actions
>
</
ttmd-table
>
What I want is only if ‘shouldPay‘ is true when display the `ttmd-action`, if not just hide it, so there is "if" attr in the tag.
But there is one problem to make it works: Because `shouldPay` prop locates on each item, if we use ng-repeat, we would do somthing like this:
<
div
ng-repeat
="item in items track by $index"
>
<
ttmd-action
if
="item.shouldPay"
></
ttmd-action
>
</
div
But I don‘t want to make component hard for user to use, so the problem we need to solve here is
- parse the expression we passed in with the right context
So here is $parse come into play:
shouldDisplay(){
let getter = this.$parse(this.if); // get the expression and conver it to a function
let context = this.ItemCtrl.getSelectedItem(); // Find the right context console.log(context);
console.log(getter(context));
return getter(context); // parse the expression with the right context
}
原文：http://www.cnblogs.com/Answer1215/p/5408647.html
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