Durandal：如何在该视图的activate（）函数中远离当前视图？ [英] Durandal: How to route away from current view within that view's activate() function?

问题描述

我有以下内容：

function activate(routeData) {
    // make dataservice call, evaluate results here.  If condition is met, reroute:
    if (true){
       router.navigateTo("#/someRoute");
     }
    alert ("should not be shown");
}

但是警报被触发了，然后然后视图改变了。

The alert is getting hit however, and then the view changes.

如何完全远离当前项目并防止该虚拟机中的其他任何代码被击中？

How do I fully navigate away from the current item and prevent any further code in that vm from being hit?

更新：

我尝试使用 guardroute ，但是我必须激活viewModel调用返回数据的dataservice，该数据确定是否应该重新路由。完全使用guardroute可以防止调用dataservice（因为activate函数中的任何内容都不会被命中）。

I tried using guardroute but I have to activate the viewModel to call the dataservice that returns the data that determines whether or not I should re-route. Using guardroute totally prevents the dataservice from getting called (since nothing in the activate function will get hit).

我也尝试从 if 块返回，但这仍然加载view / viewAttached / etc，因此UX是

I also tried returning from the if block but this still loads the view / viewAttached / etc so the UX is glitchy.

推荐答案

这里是@EisenbergEffect答案，它回答了 Google网上论坛。

Here's @EisenbergEffect answer to a quite similar discussion in google groups.

实施canActivate on您的视图模型。返回一个错误的承诺，
然后使用重定向链接。

Implement canActivate on your view model. Return a promise of false, then chain with a redirect.

您可能想举@JosepfGabriel的例子（讨论）在Durandal 1.2中进行尝试。为您的Durandal版本检查正确的 router 语法，您可能必须用 router.navigateTo（＃/ YourHash，'replace '）。

You might want to give @JosepfGabriel's example (discussion) a try in Durandal 1.2. Check the correct router syntax for your Durandal version, you might have to substitute it with something like router.navigateTo("#/YourHash", 'replace').

canActivate: function () {
    return system.defer(function (dfd) {
        //if step 2 has a problem
        dfd.resolve(false);
    })
    .promise()
    .then(function () { router.navigate("wizard/step1", { trigger: true, replace: true }); });
}

但是，这在Durandal 2.0中不起作用，并且有功能要求 https://github.com/BlueSpire/Durandal/issues/203 。

However this is NOT working in Durandal 2.0 and there's a feature request https://github.com/BlueSpire/Durandal/issues/203 for it.

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