C# - Hidden Variable Vs Server Variable Accessing On Client Side In Javascript
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?
I have a requirement of adding server side variables in client side and other way round. Because I need to set a value from client side using javascript and access the same in code behind page.
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...
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?
I have a javascript variable in the script tag. I am assigning a value to that variable and I want the same value to be assigned to the label control e.g. consider the sample code below :
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)
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.
[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.
The idea is that a pure html table will be generated on the client side. (using jQuery to add dynamic new rows to the table when the user clicks a button). These rows contain textboxes, dropdownlists, checkboxes and other input controls. When the user clicks a button, a PostBack is triggered in which I need to access this data from the table on server side, validate it and perform other actions on it.
I'm able to perform the client side and access the table data on server side by adding runat="server" to the table tag. However, I only see the initial table rows (not the ones added through JavaScript) and I have troubles retrieving the different inputs from the rows. put me in the right direction?? Or someone offering a better solution to the problem?
I am calling a Java-script function, in that i am passing the value of hidden field, that hidden field i want to use at server-side, but the value of hidden field is null.
Client Side function
function getDetails() { document.forms[0].HdnNode.value=tree_selected_id; //HTML Hidden Field. str="Cmp_12"; str_array=str.split("_"); var str_array1=str_array[0]; var str_array2=str_array[1]; document.getElementById("<%=HiddenNodeId.ClientId %>").value=str_array1; document.getElementById("<%=HiddenTreeId.ClientId %>").value=str_array2; }
Server Side Function
Public Sub InsertNodes(ByVal NodeId As String) Dim objErrorObj As New ErrorObj Dim ParentID As String ParentID = HiddenNodeParent.Value NodeId = HiddenNodeId.Value Dim NodeIDTree As String NodeIDTree = HiddenTreeId.Value End Sub
In my asp.net website I am creating a session upon user login and I would like to perform some operations in the database just before this session will expire.I am having problem in determining where should I write code and how will I know the session is going to expire.
I am not sure if 'session_end' event of 'Global.asax' suits my requirements as the session I want to check is created manually(not a browser instance).
I have a table that the user can add rows to through javascript by clicking on a "add rows button". In each row there are two columns one with a dropdown list and the other a text box. The dropdown list is populated with data through a sub on server side code.I need to be able to insert the data from each row into a table but I'm unable to do this. I clicked on my "add rows button" to add several rows and then did a test to see how many rows the table was returning on the server side and it did not include the five rows I added .. only the header row.If there is a better way to allow users to dynamically add rows to a table and then access the dynamically created table on the server then I'm all ears!
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...
Possible Duplicates: how to call server side function from client side - asp.net Calling ASP.NET Code Behind function from Javascript Calling ASP.NET server side method via JQuery While loading an aspx page, how is it possible to call a server side method with the client side code?Can u show one example?
I have two comboboxes and would like pass selected value and text to the server method (RadComboBoxItemsRequestedEventArgs) when the first combobox selected index changed.
Here is my code. But I am getting Javascript error message at this line. RadComboBox2.requestItems(item, false).
I'm working on developing a custom control to select items from a predefined list. This is accomplished via 2 ASP.NET ListBox controls, with a few buttons to trigger the movement of ListItems from one ListBox to the other (lets call these ListBoxes lstSelected and lstDeselected).
This is easy enough to do in ASP.NET or JavaScript independently: I have both working. However, if modifications are made via JavaScript, ASP.NET retains no knowledge of this. Is there any way to register the creation of of options in a select tag without AJAX?
I've got a function I wrote quite some time ago that works fine, but I'd like to speed up the process and lessen server load by doing the same job in Javascript.I seem to be able to GET textbox values ok, but I can't seem to SET textbox values (I'm'-a JS noob). Can anyone lend a hand in converting my VB.NET code to it's JS equivalent?
Protected Sub txtSellingPrice_TextChanged(ByVal sender As Object, ByVal e As EventArgs) _ Handles txtSellingPrice.TextChanged Dim SellingPrice As Double = Double.Parse(txtSellingPrice.Text.Replace("$", "")) [code]...
There are two frames. In ASP page 1 that is being displayed in frame 1, we have a form with hidden variables. On some action this from is submitted to frame 2 with action as ASP page 2 (target = frame2, action = 'ASP Page 2') using POST method. But on ASP page 2 when we try to get Form's hidden variable via Request object, sometimes we get them correctly but sometimes they are blank. Generally, first or second time, they show some values but after that they go blank. This problem is seen in IE 7 only and has not been observed in any other version of IE or other browsers.
I have an application that goes through a series of questions and I have a view that shows each question based on the ViewData.
I would like to store the QuestionID (the view uses this to determine which question to show), but I'm curious if I should be storing the CurrentQuestionID in the Session or as a hidden field?
I am sure this is pretty common and I was curious what the conventions/best practices were for this sort of thing.
Question. Say for example if i have a business entity -> Customer, which has customerId, customerName and customerType. I have created an asp:Hidden Variable hdnCustomer to runat="server"
If i wanted to serialize the value of the customer business entity (in the code behind) to the hdnCustomer then how would i do that?
// Psudo code Collection customerList = new Collection(); customerList = BusinessAccess.GetCustomerList(); hdnCustomer = serialize and assign the value of 'customerList' to hdnCustomer; ... ... // Later on a select index change of one of the drop down lists
inside the event handler for the drop down list
{ Collection customerList = new Collection(); customerList = deserialize the value from hdnCustomer int a = Convert.ToInt32(ddlDropDown.SelectedValue); foreach(a in customerList) { // Do something } }
I am using ASP.NET 2.0 and C#. I have a gridview, which has a datanavigateurlformatstring, in which i am passing data in the gridview as querystrings.I have a hiddenvariable in the page. i would like to pass the hidden variable to the gridview in the datanavigateurlformatstring.Currently i have the gridview and hidden variable like this:
[Code]....
How to pass the hiddenfield value in the datanavigateurlformatstring?
I know that I can receive an javascript object from the server via ASP.NET AJAX using Json. But I am not sure how can I send an javascript object from my client-side javascript to my server-side code. And if I can, how can I extract this object in my server-side code and access its members?
