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How to send form values of array/list without correct indexing?

Let's assume that we have model and View like this:
public class Test
{
public List<string> data { get; set; }
}
<form asp-action="View">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<input name="data[0]" value="dsa" />
<input name="data[1]" value="asd" />
<div class="form-group">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</form>
[HttpPost]
public IActionResult View(Test input)
{
return View();
}
I'm sending this form to the controller's method and he sees those elements of data properly.
But if I change indexing to:
<input name="data[0]" value="dsa" />
<input name="data[2]" value="asd" />
then it is not going to work. I know that it makes sense in this way, but is there an option to disable index checking and just insert all those values into list/array with correct indexing?
So, in 2nd case data[0] would be data[0], but data[1] would be data[2].
Just for every "gap" in indexing, move Next objs to fil lthat gap.

You can use just:
<input name="data[]" value="dsa" />
<input name="data[]" value="asd" />
If you specify the index at all, though, it must be in order.

How to pass textbox values to MVC Action?

I have tried the below but I get the compliation error:
The name 'txtMakeModelTypeCode' does not exist in the current context.
<label>Type Code</label>
<input type="text" id="txtMakeModelTypeCode" name="txtMakeModelTypeCode" />
<label>Make</label>
<input type="text" id="txtMake" name="txtMake"/>
<label>Model</label>
<input type="text" id="txtModel" name="txtModel"/>
Create
I have also tried using a form but I don't want to use a submit button. Is it possible to use a plain button?
#using (Html.BeginForm("CreateMakeModel", "Vehicle"))
{
<label>Type Code</label>
#Html.TextBox("txtMakeModelTypeCode")
<label>Make</label>
#Html.TextBox("txtMake")
<label>Model</label>
#Html.TextBox("txtModel")
<input type="submit" value="Create" />
}

MVC does not work the same as ASP.Net Webforms. The textboxes you create are not available in code. You use the controls to render your html and handling of data is done via the model.
So use TextBoxFor:
#using (Html.BeginForm("CreateMakeModel", "Vehicle"))
{
<label>Type Code</label>
#Html.TextBoxFor(m => m.MakeModelTypeCode)
<label>Make</label>
#Html.TextBoxFor(m => m.Make)
<label>Model</label>
#Html.TextBoxFor(m => m.Model)
<input type="submit" value="Create" />
}
Then in your controller, after the post, you should have the posted data in the model:
public ActionResult Index(CreateMakeModel model) // or is it Vehicle?
{
// whatever you do here:
string code = model.MakeModelTypeCode;
}

Is it possible to know which of two submit buttons are clicked?

I am thinking of having something like this:
#if(Model.ShowSubmitButton)
{
<input id="submitButton" type="submit" value="Update stuff" />
}
else
{
<input id="continueButton" type="submit" value="Continue to next page" />
}
Then in controller is it possible to know which button it is getting called from?
I originally had my controller method working with the first button, now adding a second button with different functionality, wanted to see if using the same method I can determine which button was clicked ? and if it is not possible this way, then what do you suggest?

Not without extra information. I would likely split them up rather than have two submit buttons for the same form doing two different things but if you really want to go down that road one way would be to add an additional posted variable that tells you which was clicked.
#if(Model.ShowSubmitButton)
{
<input type="hidden" name="submitStyle" value="update"/>
<input id="submitButton" type="submit" value="Update stuff" />
}
else
{
<input type="hidden" name="submitStyle" value="continue"/>
<input id="continueButton" type="submit" value="Continue to next page" />
}
To answer your additional question. Either you can add this variable to your model posted back or add it as an additional parameter.
// Where "MyModel" has a public property "SubmitStyle"
public ActionResult MyAction(MyModel model)
// Or an int, string, whatever type of parameter you want/need.
// In my example it was a string so...
public ActionResult MyAction(string submitStyle/*, <other params...>*/)

You could add a hidden field. Not ideal solution, but does the job.
#if(Model.ShowSubmitButton)
{
<input type="hidden" name="buttonClicked" value="1">
<input id="submitButton" type="submit" value="Update stuff" />
}
else
{
<input type="hidden" name="buttonClicked" value="2">
<input id="continueButton" type="submit" value="Continue to next page" />
}
In your controller you would accept it as:
public ActionResult MyAction(MyObject myobj, int buttonClicked)

There is an elegant way (tested only on chrome yet), define two inputs
<input type="submit" value="Next" name="Action"/>
<input type="submit" value="Prev" name="Action"/>
Now in you input model in controller put model defined like this:
public class MyModelDto
{
// other properties
public MyCustomAction Action { get; set; }
}
Where the
public enum MyCustomAction
{
Next=0,
Prev=1
}
Now check the value of action.

HTML checbkox values to C# array

I have list of html checboxes in form and I need get checked checboxes values to C# array after form sent, it is possible?
<form id="form1" action="" method="post">
#foreach (var category in ViewBag.Categories)
{
<ul>
<li>
<input type="checkbox" name="Category" value=#category["UUID"] />#category["CategoryName"]<br /> //Generate >20 checkboxes
</li>
</ul>
}
<button type="submit" formmethod="post">Search</button>
</form>

First of all change following line:
<input type="checkbox" name="Category" value=#category["UUID"] />#category["CategoryName"]<br />
to:
<input type="checkbox" name="Category" value="#category["UUID"]"/>#category["CategoryName"]<br />
and now in your action you can get it from Request object or by adding a parameter of name Category to get in the action:
[HttpPost]
public ActionResult SomeAction()
{
var checkedCategories = Request.Form["Category"];
}
or:
[HttpPost]
public ActionResult SomeAction(int[] Category)
{
}

<input type="checkbox" name="Category" value=#category["UUID"] runat="server" />#category["CategoryName"]<br />
include runat="server" in the input type. you can acess in the code behind.

How to send text from the textbox to the actionResult?

I have a question about MVC4 (Razor). I have page where I want to filter data. There is a textbox (input) and a submit button. I want to move the text in the textbox to the actionresult. How can I resolve this?
On my page I've the following row:
#{ using (Html.BeginForm("Experiences"))
{
<span class="label">Filter on:</span><input id="FilterText" type="text" size="50"/>
<input type="submit" value="Submit" name="knowledge" /><br />
}
}
<br />
And I want to call the ActionResult Experiences
public ActionResult Experiences(string knowledge = "")
{
ReadExperienceData(knowledge);
return View(ListOfExperiences);
}

Specify the name property value of the input element same as the action method parameter name.
<input id="FilterText" name="knowledge " type="text" size="50"/>
<input type="submit" value="Submit" name="submitKnowledge" />
Also it looks like you are not using the Beginform method properly. You may try any of the below overloads, as needed
#using(Html.Beginform("Knowledge","YourControllerName"))
{
//form elements
}
or
#using(Html.Beginform())
{
//form elements
}