As we know that in asp.net mvc if we use
#HtmlTextbox("t1",Model.val)
then it will create html output as
<input type="text" value="Value of val in Model"/>
but rather using htmlhelpers in asp.net mvc if I directly use
<input type="text" value="#Model.val"/>
So which is better using htmlhelpers or directly html tags in asp.net mvc
I think <input type="text"> is faster then the HTML helper .
but in case of validation I recommend HTML Helper it is automatically handle validation if provided in model.
else you need to handle validation in case of <input type="text">
The version that requires least computing (the 2nd one) is faster, but the 1st one is more readable.
Related
I use Html.BeginForm() in some Asp.net M but i did not understand where its use becomes compulsory .Why i really needed to use it in my Views..? It may be a silly question but i am perplexed and confused to use this Html-helper in mvc...??
Here below i have code for search option but i did not know what is meaning of FormMethod.Get so please explain it briefly ?
using(Html.BeginForm("Index","Home",FormMethod.Get))
{
<b>Search Option</b>
#Html.TextBox("Search") <input type="submit" value="Search"/>
}
Html.BeginForm is a helper method which generates the HTML markup for a form tag to the page/view. When you use it will using , it properly creates a end form tag (<\form>) as well. So basically when razor executes the code in your question, it will generate markup like this
<form action="/Home/Index" method="get">
<!-- markup generated by other elements inside the form will goes here -->
</form>
One benefit of using the helper method is , it properly generates the correct markup that you /i write the markup of form tag and the attributes needed which is prone to human errors (typo). Also the helper method always generate the correct relative path to the action method for the value of the action attribute.
It is not necessary to use this method for your view. If you prefer to write clean-readable UI code, you would do that by replacing your helper method calls with something like
<form action="/Home/Index" method="get">
<b>Search Option</b>
<input id="Search" name="Search" type="text" value="">
<input type="submit" value="Search">
</form>
In ASP.NET Core, we have tag helpers which allows us to write code to generate form(or other form elements) as close to the above hand written html markup. So the code will basically look more like pure HTML than C# or VB.NET
Is it possible to get the value of the view state that ASP.NET writes in:
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="..." />
, before the processing is done for the page, in C#, in one of the page events, such as
OnSaveStateComplete
If so, how?
Thanks!
Simple answer - no.
You could start playing with internal methods like System.Web.UI.Control.SaveViewStateRecursive using Reflection but you have a very good chance that whatever you will build will stop working on the next .NET Framework update.
If you want to provide custom storage mechanism for ViewState you would implement PageStatePersister.
I am trying to do something from scratch in asp
I would like to get something like below. From basic hard coded values.
http://localhost:2478/Default.aspx?phone=905123456&order=123456
After that I want to use this parameter in my variables for SQLquery
I am new to asp.net and vb , I'm learning. Can you please explain me in details? Any helps will be appreciate.
Can you please provide any basic code from where I can start
Based on your latest comments:
<form method="get" action="default.aspx">
<input type="text" name="phone" />
<input type="text" name="order" />
<input type="submit" value="submit" />
</form>
Key points:
method=get (fields are in url instead of body)
note that the form above doesn't have runat=server (more below) - it's a plain HTML Form on plain HTML page
in the context of ASP.Net Web forms, you may run into issues particularly if you are using Master Pages (you can't nest forms, and a Master page is a container for your entire page).
ASP.Net forms do POSTbacks - re: method=post
You can use/add plain forms in an ASP.Net page as long as you don't nest them (outside of the server side ASP.Net form).
If you have no choice (e.g. Master Page), you'll have to construct the Querystring manually after a POSTback, then Response.Redirect to some other target (adding the querystring manually).
there are other non-ASP.Net-y ways of doing it - e.g. javascript, but that a different story
I know with ASP.Net 4.0 you can have ClientIDMode to static to have clean ID.
Is there something to have "name" the same way?
Example :
<input type="text" name="_wizard$ctl00$CaptionName" id="captionName">
You could output a key/pair javascript collection with the list of controls you're looking to operate on client-side. Control.ClientID and ClientScript.RegisterStartupScript are your friends.
I have a classic asp application. I want to post a contest form from that page to an Asp.Net form. The reason is that I want to use a lot of logic i have built into an Asp.Net page for validation before entering into the database and I don't know asp very well. Not to mention asp.Net being more secure.
What's the best way to accomplish this goal? My thoughts are as follows:
My asp Page:
<html>
<body>
<form action="/Contests/entry.aspx" method="post">
Name: <input type="text" name="fname" size="20" />
Last Name: <input type="text" name="lname" size="20" />
<input type="submit" value="Submit" />
</form>
</body>
</html>
aspx page is running in a Virtual Directory and would handle anything posted to it.
Is this possible, or does aspx prevent this kind of thing?
I ( preferably ) don't want to create the form in aspx as my colleague wants to have control of the page and build the html himself and I don't want the hassle of constantly changing it.
Are there caveats I need to consider?
What roadblocks will I run into?
How do I access the Posted Form Values? Request.Form?
Yes it is possible. In general, a POST is a POST. So you can post from a PHP page to a .NET page if you wanted. You would access the Request.Form variables just as you do now. You will have to look at the ASP Classic page to see the names of the post items but in general, you can access them as if you had pasted from .NET page.
This can be done and works fine. You will access the Posted Form values as you said via Request.Form.
I think the biggest caveat is that you will need to handle invalid data in some way - typically with a webform the .aspx page would be displayed again with validation errors, but that would likely be inappropriate for your circumstance. Probably you will need to redirect them back to the .asp page with query string parameters indicating the failures and the page will need code allowing it to fill in the form fields with their previous values and display the error message.
How about calling an ASP.NET webservice from classic asp?
https://web.archive.org/web/20210125161040/http://www.4guysfromrolla.com/webtech/070302-1.shtml