How To Use Jquery Plugins In Asp.net Mvc Validation?
We can use dataannotations for validation in ASP.Net MVC. If we want to use validation during runtime using Jquery then we can use Jquery plugins for validation.
Eg
If validation is to be done on customer name textbox then we can do as
$('#CustomerName').rules("add", {
required: true,
minlength: 2,
messages: {
required: "Please enter name",
minlength: "Minimum length is 2"
}
});
How We Can Multiple Submit Buttons In Asp.net Mvc?
Below is the scenario and the solution to solve multiple submit buttons issue. Scenario
@using (Html.BeginForm("MyTestAction","MyTestController")
{
<input type="submit" value="MySave" />
<input type="submit" value="MyEdit" />
} Solution
Public ActionResult MyTestAction(string submit) //submit will have value either "MySave" or "MyEdit"
{
// Write code here
}
What Are The Differences Between Partial View And Display Template And Edit Templates In Asp.net Mvc?
Display Templates : These are model centric. Meaning it depends on the properties of the view model used. It uses convention that will only display like divs or labels.
Edit Templates : These are also model centric but will have editable controls like Textboxes.
Partial View : These are view centric. These will differ from templates by the way they render the properties (Id's) Eg : CategoryViewModel has Product class property then it will be rendered as Model.Product.ProductName but in case of templates if we CategoryViewModel has List then @Html.DisplayFor(m => m.Products) works and it renders the template for each item of this list.
Can I Set The Unlimited Length For "maxjsonlength" Property In Config?
No. We can't set unlimited length for property maxJsonLength. Default value is - 102400 and maximum value what we can set would be : 2147483644.
Can I Use Razor Code In Javascript In Asp.net Mvc?
Yes. We can use the razor code in javascript in cshtml by using <text> element.
< script type="text/javascript">
@foreach (var item in Model) {
< text >
//javascript goes here which uses the server values
< text >
}
< script>
How Can I Return String Result From Action In Asp.net Mvc?
Below is the code snippet to return string from action method
public ActionResult TestAction() {
return Content("Hello Test !!");
}
What Are Ajax Helpers In Asp.net Mvc?
AJAX Helpers are used to create AJAX enabled elements like as Ajax enabled forms and links which performs the request asynchronously and these are extension methods of AJAXHelper class which exists in namespace - System.Web.ASP.Net MVC.
Explain Sections Is Asp.net Mvc?
Section are the part of HTML which is to be rendered in layout page. In Layout page we will use the below syntax for rendering the HTML
@RenderSection("TestSection") And in child pages we are defining these sections as shown below
@section TestSection{
<h1>Test Content<h1>
} If any child page does not have this section defined then error will be thrown so to avoid that we can render the HTML like this
@RenderSection("TestSection", required: false)
How To Change The Action Name In Asp.net Mvc?
"ActionName" attribute can be used for changing the action name.
Below is the sample code snippet to demonstrate more
[ActionName("TestActionNew")]
public ActionResult TestAction()
{
return View();
}
So in the above code snippet "TestAction" is the original action name and in "ActionName" attribute, name - "TestActionNew" is given. So the caller of this action method will use the name "TestActionNew" to call this action.
What Are Code Blocks In Views?
Unlike code expressions that are evaluated and sent to the response, it is the blocks of code that are executed. This is useful for declaring variables which we may be required to be used later.
@{
int x = 123;
string y = "aa";
}
What Is The "helper Page.isajax" Property?
The Helper Page.IsAjax property gets a value that indicates whether Ajax is being used during the request of the Web page.
Can You Explain Renderbody And Renderpage In Asp.net Mvc?
RenderBody is like ContentPlaceHolder in web forms. This will exist in layout page and it will render the child pages/views. Layout page will have only one RenderBody() method. RenderPage also exists in Layout page and multiple RenderPage() can be there in Layout page.
What Is Viewstart Page In Asp.net Mvc?
This page is used to make sure common layout page will be used for multiple views. Code written in this file will be executed first when application is being loaded.
Explain The Methods Used To Render The Views In Asp.net Mvc?
Below are the methods used to render the views from action -
View() : To return the view from action.
PartialView() : To return the partial view from action.
RedirectToAction() : To Redirect to different action which can be in same controller or in different controller.
Redirect() : Similar to "Response.Redirect()" in webforms, used to redirect to specified URL.
RedirectToRoute() : Redirect to action from the specified URL but URL in the route table has been matched.
What Are The Sub Types Of Actionresult?
ActionResult is used to represent the action method result. Below are the subtypes of ActionResult
ViewResult
PartialViewResult
RedirectToRouteResult
RedirectResult
JavascriptResult
JSONResult
FileResult
HTTPStatusCodeResult
What Are Non Action Methods In Asp.net Mvc?
In ASP.Net MVC all public methods have been treated as Actions. So if you are creating a method and if you do not want to use it as an action method then the method has to be decorated with "NonAction" attribute as shown below
[NonAction]
public void TestMethod()
{
// Method logic
}
How We Can Call A Javascript Function On The Change Of A Dropdown List In Asp.net Mvc?
Create a JavaScript method
function DrpIndexChanged() { } Invoke the method
< %:Html.DropDownListFor(x => x.SelectedProduct, new SelectList(Model.Customers, "Value", "Text"), "Please Select a Customer", new { id = "ddlCustomers", onchange=" DrpIndexChanged ()" })%>
What Are Validation Annotations?
Data annotations are attributes which can be found in the "System.ComponentModel.DataAnnotations" namespace. These attributes will be used for server-side validation and client-side validation is also supported. Four attributes - Required, String Length, Regular Expression and Range are used to cover the common validation scenarios.
Why To Use Html.partial In Asp.net Mvc?
This method is used to render the specified partial view as an HTML string. This method does not depend on any action methods.
We can use this like below
@Html.Partial("TestPartialView").
We can use dataannotations for validation in ASP.Net MVC. If we want to use validation during runtime using Jquery then we can use Jquery plugins for validation.
Eg
If validation is to be done on customer name textbox then we can do as
$('#CustomerName').rules("add", {
required: true,
minlength: 2,
messages: {
required: "Please enter name",
minlength: "Minimum length is 2"
}
});
How We Can Multiple Submit Buttons In Asp.net Mvc?
Below is the scenario and the solution to solve multiple submit buttons issue. Scenario
@using (Html.BeginForm("MyTestAction","MyTestController")
{
<input type="submit" value="MySave" />
<input type="submit" value="MyEdit" />
} Solution
Public ActionResult MyTestAction(string submit) //submit will have value either "MySave" or "MyEdit"
{
// Write code here
}
What Are The Differences Between Partial View And Display Template And Edit Templates In Asp.net Mvc?
Display Templates : These are model centric. Meaning it depends on the properties of the view model used. It uses convention that will only display like divs or labels.
Edit Templates : These are also model centric but will have editable controls like Textboxes.
Partial View : These are view centric. These will differ from templates by the way they render the properties (Id's) Eg : CategoryViewModel has Product class property then it will be rendered as Model.Product.ProductName but in case of templates if we CategoryViewModel has List then @Html.DisplayFor(m => m.Products) works and it renders the template for each item of this list.
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| Kofax Most Frequently Asked ASP.NET MVC Interview Questions Answers |
Can I Set The Unlimited Length For "maxjsonlength" Property In Config?
No. We can't set unlimited length for property maxJsonLength. Default value is - 102400 and maximum value what we can set would be : 2147483644.
Can I Use Razor Code In Javascript In Asp.net Mvc?
Yes. We can use the razor code in javascript in cshtml by using <text> element.
< script type="text/javascript">
@foreach (var item in Model) {
< text >
//javascript goes here which uses the server values
< text >
}
< script>
How Can I Return String Result From Action In Asp.net Mvc?
Below is the code snippet to return string from action method
public ActionResult TestAction() {
return Content("Hello Test !!");
}
What Are Ajax Helpers In Asp.net Mvc?
AJAX Helpers are used to create AJAX enabled elements like as Ajax enabled forms and links which performs the request asynchronously and these are extension methods of AJAXHelper class which exists in namespace - System.Web.ASP.Net MVC.
Explain Sections Is Asp.net Mvc?
Section are the part of HTML which is to be rendered in layout page. In Layout page we will use the below syntax for rendering the HTML
@RenderSection("TestSection") And in child pages we are defining these sections as shown below
@section TestSection{
<h1>Test Content<h1>
} If any child page does not have this section defined then error will be thrown so to avoid that we can render the HTML like this
@RenderSection("TestSection", required: false)
How To Change The Action Name In Asp.net Mvc?
"ActionName" attribute can be used for changing the action name.
Below is the sample code snippet to demonstrate more
[ActionName("TestActionNew")]
public ActionResult TestAction()
{
return View();
}
So in the above code snippet "TestAction" is the original action name and in "ActionName" attribute, name - "TestActionNew" is given. So the caller of this action method will use the name "TestActionNew" to call this action.
What Are Code Blocks In Views?
Unlike code expressions that are evaluated and sent to the response, it is the blocks of code that are executed. This is useful for declaring variables which we may be required to be used later.
@{
int x = 123;
string y = "aa";
}
What Is The "helper Page.isajax" Property?
The Helper Page.IsAjax property gets a value that indicates whether Ajax is being used during the request of the Web page.
Can You Explain Renderbody And Renderpage In Asp.net Mvc?
RenderBody is like ContentPlaceHolder in web forms. This will exist in layout page and it will render the child pages/views. Layout page will have only one RenderBody() method. RenderPage also exists in Layout page and multiple RenderPage() can be there in Layout page.
What Is Viewstart Page In Asp.net Mvc?
This page is used to make sure common layout page will be used for multiple views. Code written in this file will be executed first when application is being loaded.
Explain The Methods Used To Render The Views In Asp.net Mvc?
Below are the methods used to render the views from action -
View() : To return the view from action.
PartialView() : To return the partial view from action.
RedirectToAction() : To Redirect to different action which can be in same controller or in different controller.
Redirect() : Similar to "Response.Redirect()" in webforms, used to redirect to specified URL.
RedirectToRoute() : Redirect to action from the specified URL but URL in the route table has been matched.
What Are The Sub Types Of Actionresult?
ActionResult is used to represent the action method result. Below are the subtypes of ActionResult
ViewResult
PartialViewResult
RedirectToRouteResult
RedirectResult
JavascriptResult
JSONResult
FileResult
HTTPStatusCodeResult
What Are Non Action Methods In Asp.net Mvc?
In ASP.Net MVC all public methods have been treated as Actions. So if you are creating a method and if you do not want to use it as an action method then the method has to be decorated with "NonAction" attribute as shown below
[NonAction]
public void TestMethod()
{
// Method logic
}
How We Can Call A Javascript Function On The Change Of A Dropdown List In Asp.net Mvc?
Create a JavaScript method
function DrpIndexChanged() { } Invoke the method
< %:Html.DropDownListFor(x => x.SelectedProduct, new SelectList(Model.Customers, "Value", "Text"), "Please Select a Customer", new { id = "ddlCustomers", onchange=" DrpIndexChanged ()" })%>
What Are Validation Annotations?
Data annotations are attributes which can be found in the "System.ComponentModel.DataAnnotations" namespace. These attributes will be used for server-side validation and client-side validation is also supported. Four attributes - Required, String Length, Regular Expression and Range are used to cover the common validation scenarios.
Why To Use Html.partial In Asp.net Mvc?
This method is used to render the specified partial view as an HTML string. This method does not depend on any action methods.
We can use this like below
@Html.Partial("TestPartialView").
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