在 jquery 中使用 viewbag - asp.net mvc 3
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using viewbag with jquery - asp.net mvc 3
提问by bobek
I have a ViewBag.IsLocal set to true in controller. I would like to use jquery to check the ViewBag value and display an alert.
我在控制器中将 ViewBag.IsLocal 设置为 true 。我想使用 jquery 检查 ViewBag 值并显示警报。
Code:
代码：
if(@ViewBag.IsLocal == true)
{
alert("yeah");
}
I never get the alert. When I use Firebug to see the value of ViewBag it's True ( with capital T). Do I have to do something like == 'True'? I tried it all and none of that worked.
我从来没有收到警报。当我使用 Firebug 查看 ViewBag 的值时，它是 True（大写 T）。我必须做 == 'True' 之类的事情吗？我尝试了所有方法，但没有一个奏效。
Thank you for help.
谢谢你的帮助。
H
H
回答by Darin Dimitrov
Assuming you have set the IsLocal property to a boolean value in your controller action:
假设您已在控制器操作中将 IsLocal 属性设置为布尔值：
public ActionResult Index()
{
ViewBag.IsLocal = true;
return View();
}
you could do this on the view:
您可以在视图上执行此操作：
<script type="text/javascript">
@if(ViewBag.IsLocal)
{
<text>alert("yeah");</text>
}
</script>
And please don't use ViewBag/ViewData. Use view models and strongly typed views.
并且请不要使用 ViewBag/ViewData。使用视图模型和强类型视图。
So here's a better approach that I prefer. You could JSON serialize your view model into a javascript variable and then deal with it. Like this:
所以这里有一个我更喜欢的更好的方法。您可以 JSON 将您的视图模型序列化为一个 javascript 变量，然后对其进行处理。像这样：
@model MyViewModel
<script type="text/javascript">
var model = @Html.Raw(Json.Encode(Model));
// at this stage model is a javascript variable containing
// your server side view model so you could manipulate it as you wish
if(model.IsLocal)
{
alert("hello " + model.FirstName);
}
</script>
Obviously if you don't need your entire view model you could JSON serialize only a subset of it => only the part that will be needed by client scripts.
显然，如果你不需要你的整个视图模型，你可以 JSON 序列化它的一个子集 => 只有客户端脚本需要的部分。
回答by Dave Ward
If you view source on the rendered page, what's being inserted in place of your razor nugget? If IsLocalis a bool type, I think you'll see this:
如果您在呈现的页面上查看源代码，会插入什么来代替您的剃刀金块？如果IsLocal是 bool 类型，我想你会看到这个：
@if(True == true)
{
alert("yeah");
}
The reason for that is because true.ToString()is True.
原因是因为true.ToString()是True。
In which case, you'll need to make a string comparison there:
在这种情况下，您需要在那里进行字符串比较：
if('@ViewBag.IsLocal' == 'True')
{
alert("yeah");
}
回答by ovais
You can use the following function
您可以使用以下功能
function parseBoolean(str)
{
return /^true$/i.test(str);
}
and Use it as
并将其用作
if(parseBoolean('@ViewBag.IsLocal') == true)
{
alert("yeah");
}
