Is it possible for angular.js to interact with JSTL expression language? I am trying to generate ng-options using an array. Here is an example of what I am attempting to accomplish:
<select ng-model="detail" ng-init="Categories = '${Categories}'" ng-options="'${Category.code}' for Category in Categories">
Communication between Angular and JSTL is not possible, but you can still achieve your desired outcome. JSPs are evaluated server-side to generate static HTML sent to the client-side where Angular operates. Therefore, JSTL is evaluated server-side and cannot directly communicate with Angular.
Assuming you have assigned variables as follows:
Categories = '[{"code": "foo", ...}, {"code": "bar", ...}]'
And your JSP contains this line:
<select ng-model="detail" ng-init="Categories = '${Categories}'" ng-options="'${Category.code}' for Category in Categories">
After evaluation, Angular will see:
<select ng-model="detail" ng-init="Categories = '[{"code": "foo", ...}, {"code": "bar", ...}]'" ng-options="'' for Category in Categories">
While this may work, a better approach might be:
JSP:
window.categories = ${Categories};
If your categories variable is JSON format. If not, convert it to JSON using Jackson or manually through JSTL. Now you have a javascript variable with your categories, allowing you to use Angular logic to iterate through them.
For example, a FooController:
angular.module("controllers")
.controller("FooController", [
"$scope",
"$window",
function($scope, $window) {
$scope.categories = $window.categories;
}
]);
Now with categories in the scope, you can display them in your view like this:
<select ng-model="detail" ng-options="'category.code for category in categories">
I am of the opinion that the answer is affirmative (I would be interested in testing this, but unfortunately, I am currently occupied with other tasks). JSTL is executed on the server side to generate HTML content (along with other functions). On the other hand, AngularJS operates on the client side.
Therefore, based on your provided example, it seems that the "categories" attribute would be assigned the output string from the ${Categories} JSTL EL evaluation.
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