I'm trying to create a generic <input type="button"> button in ASP.Net using an ASP.Net control and I'm unfortunately stuck using ASP.Net 1.1 right now. I know you can use the UseSubmitBehavior="False" attribute in later versions of ASP.Net but I can't seem to find a way to do this in ASP.Net 1.1. Is there a way to do this or will I need to just create the HTML version of the control and set it to runat="server"?
ASP:Button in ASP.NET 1.1
Well it looks like you just can't do this with an asp.net control. The only way I was able to make this work was with an <input type="button" runat="server"> control.
Related
Should I use ASP elements with a runat="server" attribute or an HTML form?
It seems like using ASP tags such as <asp:TextBox> is much more comfortable since I don't have to redirect the user to another page on a form submition, but also from what I've seen, it seemed like HTML forms are the more accepted way. I was starting to wonder if using ASP elements increases server load or has any other disadvantage?
In case I should use ASP elements, how do I validate the input with Javascript before sending it to the server?
In case I should use HTML forms, how do I not redirect the user on submition and also not run the server code on page load?
You can easily use the HTML5 input type in Web Forms by adding the runat="server" attribute, so that it can be accessed on the server-side:
<label for="name">Name:</label>
<input type="text" id="name" name="name" required
minlength="4" maxlength="8" size="10" runat="server">
Note, on the server-side you will access it via the Value property of the input element, not with the Text property of a typical ASP.NET textbox control.
Contrary to what a lot of people think, ViewState only ever becomes a problem when people do silly things like nesting data-bound controls, in which case it can become bloated very quickly.
Not sure what you're asking regarding validation... but you still have options like this on both client and server. If you're working with an existing Web Forms project, I would stick with regular ASP.NET controls and keep it simple. This way, you can have out-of-the-box validation on both client and server.
Situation: I have been creating webpages in HTML5/CSS3 & Javascript using Sublime 2 text editor for a year, however a college course now requires me to use Asp.Net and Visual Studio 2010. I do not use the designer because I am proficient at doing things by hand, however I find that writing asp: inside every element is time consuming and causes syntax errors when applied to some HTML 5 tags and not others.
Example HTML 5: <button id="btn" type="submit" value="Button"/>
Example Asp.net: <asp:Button ID="Button1" runat="server" Text="Button" />
Question: Can the asp: portion be omitted without effecting anything or is it required for IIS or the C# back-end functionality? What about runat="server" can that be omitted?
Google has come up dry regarding my inquiry, so any help is appreciated.
you simply cannot remove either of the two
but hear me out why, because I have a feeling you are not familiar with ASP and therefor are mistaking the meaning of the asp: and the runat="server" syntax.
first: runat="server"
this property on an element, tells the the compiler that this is actually a server side control
so a <button/> is not the same as an <button runat="server"/>
the first one is pure html, while the second one is a control, which can be bound to on the server side. .Net will give it a clientID (not to be mistaken by the ID you have to give it yourself).
second: asp:
this is a prefix, on certain elements, that tells the compiler these are ASP controls (the default controls given by the ASP.net framework). These include Buttons, TextBoxes, DropDownLists, ...
do not mistake 1 of these with a html element.
an <asp:Button id="myAspButton" runat="server"/>
is not the same as a <button id="myHtmlButton"/>
the first, is a server side control, which can be bound to (see it's runat="server" attribute), and this control renders to the browser as a <input type="submit"/> for example.
you could alter the rendering of the asp.net button class to make it return something entirely differnt if you wish.
and you are also not limited to using asp.net classes.
you can create your own controls, and put them in a custom created library
you could give those your own prefix.
if I created such a custom control, I could register a prefix for it in the web.config file,
and thus I could create a custom button extending from the original one (but with a default label in front...
<myc:CustomButton ID="myButton" Text="myButton" Label="myLabel" runat="server"/>
which could render into:
<label>myLabel</label>
<button ID="*******">myButton</button>
the asterisks are symbolizing the Unique ID it will get from the .net framework
if you want to know more on custom controls, or extending default controls
here is a step by step explanation to create custom controls, or extend from a TextBox control.
it also shows how you add a custom prefix for your controls (in the this case 'cc')
you can find more info here
The runat="server" part is required to tell .NET that it will have to render a button there (which will contain .NET specific ID for processing upon POST). Not too familiar with web forms (I started with MVC), but I would assume that the asp: part is to help distinguish between server controls and standard HTML markup.
Why not try removing it and if it breaks something, then you know it's needed. For instance if the button doesn't show up after removing it, then obviously the .NET markup parser needs it to be there in order to know that it is a place holder for a server control.
In the page directive of my page I have set EnableViewState="false". But I am still seeing some viewstate on my page source with this field
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/...................................
How can I remove the view state completely. I am using .NET 4.
What you're seeing is Control State. It cannot be turned off.
try using ViewStateMode property , as you are using .net 4
ViewStateMode="Disabled"
check for these links
Viewstate controling asp.net 4.0
You can't, it's a feature of webforms. If you don't like this, use MVC instead.
I inhereted this old .net 2.0 site and need to make this code view as an image, like a normal input type = "image" src=".." etc.
<cc1:LocalizedButton ID="btnLogin" runat="server" />
The site is precompiled, so I have no access to the code behind, and I need to keep this forms functionality.
It is VB to if that makes any difference.
Thanks in advance!
UPDATE: Code for first question: https://gist.github.com/1320856
You can use the ImageButton control
Good Day,
We have migrated our web application to ASP.NET 2.0 from ASP.NET 1.1.
We have a page that contains a couple of textboxes with their respective Validators.
On .NET 1.1, when a textbox contains an INVALID value, clicking on the "submit" button, will not produce a postback (E.G. Nothing will happen).
However, when we migrated to .NET 2.0, even if there is an INVALID value, the postback will still happen. (E.G. Pressing the "submit" button will perform a postback).
Is there an issue with validation when migrating from 1.1 to 2.0?
Additional Infos:
The "submit" button is an input button:
<input type="button">
Using an <asp:button> in place of the <input> button will work and will fix the problem. However, the <input type="button"> has the capability to call a javascript that will produce a "Wait... Loading" label overlay on the page. Using the asp:button, the "Wait... Loading" overlay javascript will NOT be invoked.
EDIT: Real problem and solution.
Anyway, the real problem is that the on-click validation javascript was broken during migration.
The original and working script is:
<input language="javascript" onclick="{if (typeof(Page_ClientValidate) != 'function' || Page_ClientValidate()) __doPostBack('m_bt_Save','')} " name="m_bt_Save" id="m_bt_Save" type="button" value="Save" width="80px" height="24px" />
But ASP.NET 2.0 changed it to:
<input onclick="if (typeof(Page_ClientValidate) == 'function') Page_ClientValidate(''); __doPostBack('m_bt_Save','')" name="m_bt_Save" type="button" id="m_bt_Save" value="Save" width="80px" height="24px" />
So the my solution was, change the INPUT button to an ASP:button, then add the attribute doing page load with the correct ASP.NET 1.1 javascript validation like so:
m_bt_Save.Attributes.Add("OnClick", "if (typeof(Page_ClientValidate) != 'function' || Page_ClientValidate()) __doPostBack('m_bt_Save','')");
One thing you can do, is you can just add your JS that you need to the button.
Button1.Attributes.Add("OnClick", "do my js stuff here");
That will allow you to have the exact same functionality as the input, and it makes it work.
Otherwise, my guess is that you will need to modify the way the input button submits to call the validate page method before it does the from submit.
You can use page validators from the javascript.
See this link:
http://www.aspdotnetfaq.com/Faq/How-to-control-ASP-NET-Validator-Controls-Client-Side-validation-from-JavaScript.aspx
http://www.codedigest.com/Articles/ASPNET/166_Restrict_AspNet_Validator_controls_to_Fire_on_Page_Submit.aspx
This happened in our upgrade as well. I think we narrowed it down to a problem with the WebUIValidation.js file. I think re-installing it was the final fix for us.