Why Are Hidden Fields Considered Client Side State Management
Jan 24, 2011
According to MSDN and the MCTS self-paced training, asp.net can use Hidden fields for client-side state management. The book material goes on to say view-state is more secure than hidden fields because the data is encrypted. I must be missing something here. I setup a Label and made it hidden. I can store data in this hidden label and it won't even be sent to the client browser. This not only works like server side state (note the runat=server), but this seems more secure than view-state because there's no need for encryption as the client can't even see the field.
<asp:Label ID="Label1" Visible="false" runat="server">secret info</asp:Label>
<input id="Text2" type="text" style="visibility:hidden;" value="secret 99" />
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Aug 8, 2010
If I create a new project, start this project and look at the source code, I see that there are some additions to the original code. The first this, what is "ViewState" and what does the hash mean? Why is the input control hidden?Here an example:
[code]....
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Feb 25, 2011
when we go for client and server side state management in asp.net
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Mar 26, 2010
I am trying to pass data from client to server using a hidden field. If I use a button, then OnClientClick sets the value, and OnClick does the postback and all is well.
However, I am responding to a Client event, and although this works I get no postback. How do I now force a postback from my client handler?
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Feb 10, 2011
i am facing the following problem while saving the viewstate on the server side using the savepagestatetopersistencemedium, but this is not working for the pages which contains update panel.
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Oct 7, 2010
i use all ways i found on the Net to get client IP address or PC name (client side IP) in asp.net page but always i have server IP
im behind proxy
is there a way to do that and get actual IP and PC of client or visitor of my site - i don't want outer visitor IP i want the employee IP in my LAN
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Jun 23, 2015
1.Viewstate is only for single page
2.querystring and cookies not i want to use
is there any other option to use Client side state management for multiple page like viewstate encryption.. ?
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Aug 9, 2010
cookies are generated from the client scripting.e.g. document.cookie = city=NYC;
I want to update this from GUI using
Response.cookies["city"] = LA;
I could not understand why this is not possible.( I read about Httponly and all that stuff but still not clear).If I use Javascript in code behind page then I am able to change the value.e.g.
Literal ltMsgUpdate = new Literal();
ltMsgUpdate.Text = "<script type='text/javascript'>document.cookie = 'city=LA';" + "</script>";
Page.Controls.Add(ltMsgUpdate);
But I could not use this type of code because there is response.redirect statement in the function where I am updating cookie using (response.cookie) and that's why the javascript code never runs.
Bottomline: I want to update cookies in code behind page which is generated in client scripting.
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May 3, 2010
I'm curently developing web application which uses standard form authorization and, of course, server session objects (quite classic app). Now I'm developing client side component, which base functionality is to allow users to acquire tiif/jpg/pdf document from scanner (client side) and send it to server. Because of scan complexity and need for very user friendly interface i decided to implement Activex object (object written in .net 2.0). Until now all was ok, so I have got activex which succesfully registers and scan documents on client - but i cannot manage with sending files to server.
My concept of sending files was like that:
- preparing Upload.aspx web page wich is used for reciving files sended by POST method and saving files in database (of course to proper save in database i need some current user context information) - in ActiveX i decided to use System.Net.HttpWebRequest object to prepare and send data the problem was third point:
- i thought that in-proc activex object would "derive" web session form web page activex is placed on - but i was wrong (or i made it wrong). Whenever i send request form Activex, in response i got login.aspx page - so it looks that new session is created and new authorization is needed.
I was trying to pass to my Activex values stored in "ASP.Net_SessionId" and ".ASPXAUTH" cookies, as i found that these are the values identifying session and athorized user - but with no luck.
I think, that becaause HTTP is stateless protocol all information needed to "connect to/share" existing session on IIS server need to be included in request data, so there must be way to add these information to request sended from my activex.
I would be very grateful, if someone could provide me information what should i add (headres/cookies/etc... ?) to my request data so it could share session from "parent" web page.
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Jul 19, 2010
I am trying to set a hidden type value to x on Server Side and then access it with Javascript. I have tried multiple ways to accomplish this.
At the basic level this is what I am trying to do.
Aspx page
<asp:HiddenField ID="HidRowNumber" runat="server" />
CS Page
In IsPostBack
HidRowNumber.Value = EFileRowNumber.Text;
Javscript
var status = document.getElementById("<%= HidRowNumber.ClientID %>").value;
When I am debugin it say it HidRowNumber's Value has changed to x but when I access the value with JS it always returns ''.
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Jan 30, 2010
I've got two textboxes running server side and have their visibility turned off. I'm using a couple of ASP.NET controls which require the textboxes to exist. However, I am filling them from the code behind and would not like the user to see this. Can the user turn the visibility on and see the values entered in the text box? I tried using FireBug, and I couldn't seem to select the visibility option in order to edit it. However, I'm quite new to Firebug, so there may be another way? Or does running it server side mean that the client can't ever view the contents of the textbox?
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Feb 5, 2011
I have a content-sensitive firewall between my clients and my server. If we exclude SSL solution (it's not available in my case) then I was thinking of a javascript library which encrypts custom fields at client-side and a .NET class decrypts them at server-side. Is there any solution out of the box (maybe a server control) ?
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Mar 23, 2011
I have a custom user control which contains a asp hiddenfield object. The value of this hidden field is being set using javascript and I have verified that the value is being set properly. When a postback occurs the new value is not being saved and I cannot access it in my code.
I believe the problem is because the user control is not saved in viewstate and therefore the hidden field value is not saved accross postback. How can I make the hidden field save its value? I tried accessing it from the early page cycles and still no luck.
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Oct 8, 2010
All I want to do is insert a hidden column into an asp:Griview that I'll be able to access through javascript.
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Feb 11, 2011
I have a list of items on an ASP.net page. That list is selectable in that whenever the user clicks on one, the page does a postback and the server code stores the index or some unique identifier of the picture in a ViewState property indicating that it is currently selected.
I would like to minimize the load on the server and therefore I would like to store the index or unique identifier representing the image in some way on the client side. The best way I can think to do this is to store said information in a hidden field ), however I had two questions about this before I go crazy:
Is this a security risk in any way, shape or form (i.e., exposing implementation details of the page)?
Is there a better/best way to do this that is more industry-standard? Does ASP.net provide a framework to do this that is cleaner than my idea? Seems like this would be a fairly common requirement to me...
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Feb 25, 2012
I have a textbox where data will be entered by user without any postback. I need to add the data to a variable or any hidden variable or i need to store data from all the controls on th epage in which user entered to a variable this controls in which user enters the data becomes visible on button click i mean a post back happen...
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Mar 21, 2011
How can I conditionally disable client-side validation of some fields ?
Here is the example of what I need to do:
user writes name and address and submits. Both are validated both server and client side. If validation passes e-mail is send to given address and (name, address) pair is stored.as a response same page is displayed (I don't want redirect!) this time with confirmation. User can retype their name and submit. In such case e-mail will be resend to the address that corresponds to given name.
It does not work because: client side validation will not pass when user clicks resent button on the second (confirmation screen). It would say that e-mail is required even if there is no field for it. How can I disable javascript validating email before the confirm page gets send to user ?
Example ASP.NET MVC page
<%if (Model.Confirm == false){ %>
<% using (Html.BeginForm()) { %>
Your email: <%: Html.EditorFor(m => m.Email) %>
Your name: <%: Html.EditorFor(m => m.Name) %>
<input type="submit" value="Send Email" />
[Code]....
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Sep 23, 2010
I have the following in my code (Login.aspx page)
Javascript:
<script
language="javascript"
type="text/javascript">
alert(username);
[Code]....
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Feb 24, 2011
Can we consider that two clients accessing the same method of a web service at the same time are two threads (with all problems involved...) ?Is it the same thing for methods in an asp.net web application ?
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Dec 17, 2010
How do I implement client side validation for input fields that have been added to the form dynamically with javascript in an MVC 2 application?
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Jul 14, 2010
I'm evaluating two options of accessing a server side data on client side. Little bit confused about the efficiency or may be you can call it as finding best approach to do it.
I need to access a server side data may be an integer value in javascript on client side. I know about two options to do it.Create a public variable or property on server side and set it to javascript variable on client side as below:
var value = eval(<% =value %>);
Create a asp hidden variable and set value in this hidden variable from server side and access it through javascript using document.getElementById().
Which is the best approach and what are the pros and cons?
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Mar 7, 2010
I've searched high and low for a efficient and reusable way to detect, on a postback/server-side, if any input controls on a form have been changed and I haven't found anything other than client-side solutions such as DirtyUpdatePanelExtender. I've come to the conclusion that it must be either really simple or really complicated.Ultimately what I want to do is to perform a database update, or not, depending on whether or not the user has changed any input controls on the form. The only thing I've come up with so far is to save the original values as Viewstate variables and then compare them with the Request values on a postback, but that seems far from ideal.
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Nov 23, 2010
I have a user control which contains a CustomValidator which is used according to whether a RadioButton is checked or not (there are several RadioButtons, I'm only showing the relevant one)
<asp:RadioButton runat="Server" ID="RadioBetween" GroupName="DateGroup" CssClass="date_group_options_control_radio" />
[code]...
There is some client + server side validation code (the server side code does exactly the same thing and is skipped for brevity)
<script type="text/javascript">
function ValidateDateFields_Client(source, args) [code]...
There are two instances of this control in the page. When running the client side version it hits the wrong one (the version of the control which is disabled). You can see from the generated HTML both are correctly specified. I'm not sure how .NET works out which clientside function to call given they both have the same name.
<script type="text/javascript">
//<![CDATA[
var ctl00_MCPH1_QueryTextValidator = document.all ? document.all["ctl00_MCPH1_QueryTextValidator"] : document.getElementById("ctl00_MCPH1_QueryTextValidator");
[code]...
Do i need to add something in to scope it? What's the best way to achieve this? If I disable the loading of the second control everything works fine.
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Sep 2, 2010
I have deployed a Web application on IIS 6. I want to prevent my server from setting cookie on the client browser. I am using the following setting on the web.config file.
< sessionState
mode="InProc"
cookieless="false" [code]....
However, it looks like its creating a default cookie named ".ASPXAUTH" in the client machine. I dont want my application to create any sort of cookie.Is there anything specific I need to do in web.config?
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May 18, 2010
I have a masterpage that calls all kind of external files from the server on startup, mainly css and jquery files. So, problem is, every time I open the page, there are a lot of roundtrips to the server to request these files.After the initial loading has been done, everything is ok.
Will it be possible to cache these small files to the client side, with a predetermined expiration date, so when i next open the page, I will keep the roundtrips to the servers at a minimum?
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