google中有很多主题,但任何完整且有效的示例。
如何以可检查条件和取消导航的方式包装路由器的导航?
P.S。我看到了_.wrap的想法,重写了Backbone.Router.prototype.route等,但是还没有完整的例子。 我也看到backbone-route-filter,但不知道如何将它集成到我的应用程序中。
答案 0 :(得分:2)
您可以尝试重写Backbone.history.route:
var bbhRoute = Backbone.history.route;
Backbone.history.route = function(route, callback) {
return bbhRoute.call(Backbone.history, route, function(fragment) {
// if (decide if you want to prevent navigation) {
// window.history.back(); // to ensure hash doesn't change
// return;
// }
// if you want to let it happen:
return callback.apply(this, arguments);
});
};
答案 1 :(得分:2)
为此,我扩展了Backbone.Router。我希望我的路由器可以帮到你。 我通过路由添加了一个带有前置条件的属性toEvaluate,并且我添加了evaluateRoutesFn,其函数将在导航某些路径之前对它们进行评估。
我的路线的一个例子可能是:
var MySubRouter = Backbone.ModuleRoute.extend({
//hasPermissions is static
//if you want a function of an instance you can use a function instead
evaluateRoutesFn: SomeView.hasPermissions,
toEvaluate: {
routeA: {
modulePreconditions: [SomeView.CONDITION_A, ...]
}
},
routeA: function(param1, param2) {
//the route to navigate with preconditions
},
具有权限的方法返回true或false或错误。
var MyView = ModuleView.extend({}, {
CONDITION_A: "conditionA",
hasPermissions: function (condition, properties) {
switch (condition) {
case MyView.CONDITION_A:
return app.ConditionA;
default:
return true;
}
}
});
更重要的是ModuleRoute。在这里你有我的moduleRoute的基础。我添加了更多东西。像错误控制。我在我的应用程序的每个模块中保存了所有当前路线......还有更多。你可以添加你需要的任何东西。这非常有用。
Backbone.ModuleRoute = Backbone.Router.extend({
evaluateRoutesFn: null,
toEvaluate: null,
constructor: function (prefix, options) {
this._finalRoutes = {};
Backbone.SubRoute.prototype.constructor.call(this, prefix, options);
},
onRoutes: function (route) {
var aps = Array.prototype.slice;
var args = aps.call(arguments);
args.shift();
var routeName = this.routes[route];
var evalResult = true;
try {
var toEval = this.toEvaluate && this.toEvaluate[routeName];
if (toEval) {
evalResult = this.evalPreconditions(toEval.modulePreconditions, args);
//more future preconditions
}
}
catch (err) {
evalResult = false;
}
if (evalResult)
try {
this._finalRoutes[route].apply(this, args);
}
catch (err) {
window.history.back(); //go back, error control...
}
else
window.history.back(); //no permissions, go back
},
evalPreconditions: function (preconds, args) {
if (!this.evaluateRoutesFn) {
throw "WARNING: Evaluate routes function must be overriden to evaluate them. " +
"Don't assign toEvaluate if you won't do it. The evaluation has been skipped.";
}
if (!preconds)
return true;
var evalResult = true;
for (var i = 0, len = preconds.length; i < len; i++) {
evalResult = this.evaluateRoutesFn(preconds[i], args);
if (!evalResult) {
throw "ERROR: The precondition is not truth.";
break;
}
}
return evalResult;
},
route: function (route, name, callback) {
this._finalRoutes[route] = (!callback) ? this[name] : callback;
var that = this;
callback = function (path) {
return function () {
var aps = Array.prototype.slice;
var args = aps.call(arguments);
args.unshift(path);
that.onRoutes.apply(that, args);
};
} (route);
return Backbone.Router.prototype.route.call(this, route, name, callback);
}
});