Can we use ViewData in JavaScript?
ViewData is created on Server Side of the Web application and hence it is not possible to directly set it on Client Side using JavaScript or jQuery. Thus, only possible way is to set it by making an AJAX call to the Controller’s Action method using jQuery AJAX function in ASP.Net MVC Razor.
How do I pass ViewData to view?
To pass the strongly-typed data from Controller to View using ViewData, we have to make a model class then populate its properties with some data and then pass that data to ViewData dictionary as Value and selecting Key’s name is the programmer’s choice.
How do you define ViewData?
ViewData is a dictionary of objects that are stored and retrieved using strings as keys. It is used to transfer data from Controller to View. Since ViewData is a dictionary, it contains key-value pairs where each key must be a string. ViewData only transfers data from controller to view, not vice-versa.
What kind of object is ViewData?
Dictionary type
In ASP.NET MVC, ViewData is similar to ViewBag, which transfers data from Controller to View. ViewData is of Dictionary type, whereas ViewBag is of dynamic type. However, both store data in the same dictionary internally. ViewData is a dictionary, so it contains key-value pairs where each key must be a string.
What is ViewBag and ViewData?
ViewData is a dictionary of objects that is derived from ViewDataDictionary class and accessible using strings as keys. ViewBag is a dynamic property that takes advantage of the new dynamic features in C# 4.0. ViewData requires typecasting for complex data type and check for null values to avoid error.
Can we read ViewBag in JavaScript?
The ViewBag object value will be set inside Controller and then the value of the ViewBag object will be accessed inside JavaScript function using Razor syntax in ASP.Net MVC Razor.
How do you pass value from view to controller using ViewData?
ViewData itself cannot be used to send data from View to Controller and hence we need to make use of Form and Hidden Field in order to pass data from View to Controller in ASP.Net MVC Razor.
What is difference between TempData and ViewData?
ViewData being a dictionary object is accessible using strings as keys and also requires typecasting for complex types. On the other hand, ViewBag doesn’t have typecasting and null checks. TempData is also a dictionary object that stays for the time of an HTTP Request.
When should we use ViewData?
All three objects are available as properties of both the view and controller. As a rule of thumb, you’ll use the ViewData, ViewBag, and TempData objects for the purposes of transporting small amounts of data from and to specific locations (e.g., controller to view or between views).
What is ViewData and ViewBag?
How do I use ViewData and ViewBag?
We have three options: ViewData, ViewBag, and TeampData for passing data from controller to view and in the next request….ViewData VS ViewBag VS TempData.
ViewData | ViewBag | TempData |
---|---|---|
Its value becomes null if redirection has occurred. | Same as ViewData | TempData is used to pass data between two consecutive requests. |
How do you check if the ViewBag value is null or not?
- Check in html what output this line of code @if ((bool)ViewData. ContainsKey(“FormSubmitFlag”) == false) generates. It would give you better Idea what is going wrong.
- using @ViewBag. Property!=
- possible duplicate of Checking to see if ViewBag has a property or not, to conditionally inject JavaScript. – Mate.
How to use Viewdata in a JavaScript tag?
To use ViewData in a javascript tag just prefix ViewData with the @ symbol var check = @ViewData [“array”]
Should I use a ViewModel or Viewdata in JavaScript?
To note: many people will recommend that you use a ViewModel rather than ViewData as it’s strongly typed as generally easier to work with / maintain. However, is there as reason you need/want this in javascript?
Can I use Viewdata in a webform?
or (WebForms), using the JavaScriptSerializer (and after importing theproper namespace to your webform – System.Web.Script.Serialization ): And please don’t use ViewData in an ASP.NET MVC application. Use view models and strongly typed views so that your code looks like this: