i like to have unique ids for textboxes and hidden filds .is there any property which will give unique id in asp.net ?
something like
<asp:textbox id="ctr001_1" runat="server" uniqueid="textbox" />
1st thing, why do you need to set the UniqueID property? FYI, ASP.NET web server controls has its own auto-generated readonly UniqueID property that you can access in your coding like below:
Textbox1.UniqueID()
The UniqueID is generated based on the control hierarchy, and each control's UniqueID property is, obviously, unique.
You need to use the TextBox form System.Web.UI.WebControls there you have property UniqueID.
http://msdn.microsoft.com/en-us/library/system.web.ui.control.uniqueid.aspx
Hm, not sure if this is what you are trying to achieve, but try this:
Set an attribute to your control, for example uniqueid="textbox" as you've done, then access the id by myControl.Attributes["uniqueid"].
ASP.NET will generate a UniqueID for the both TextBox and HiddenField on the page. Simply add each tag in markup and specify the ID:
<asp:textbox id="TextBox1" runat="server" />
<asp:HiddenField id="HiddenField1" runat="server" />
Both of these values can be accessed in the codebehind by:
TextBox1.Text
HiddenField1.Value
You can also see their Unquie ClientID by look at:
TextBox1.ClientID
HiddenValue1.ClientID
Related
I know its maybe unusual, but i want add htmlGenericControl to a div (it's outside a repeater) in ItemDataBound from CodeBehind..
HtmlGenericControl slider = (HtmlGenericControl)e.Item.FindControl("slider");
htmlGenericControl input = new HtmlGenericControl("input");
input.Attributes.Add("type", "radio");
input.Attributes.Add("name", "slide_switch");
input.Attributes.Add("id", string.Format("projectImage-{0}", item.ProjectImageId));
slider.Controls.Add(input);
but its return null everytime. this is the aspx code:
<div class="slider">
<asp:Repeater ID="rptProjectImages" runat="server" OnItemDataBound="rptProjectImages_ItemDataBound">
<ItemTemplate>
</ItemTemplate>
</asp:Repeater>
</div>
Didnt work with asp.net too long, but probably this should help
<div id="myDiv" runat="server">...</div>
and in codebehind myDiv should be accessible.
Several issues with this code.
First, your div is client-side only, from server-side point of view it's just a string. Turn it into server-side control with:
<div class="slider" runat="server" ID="slider">
Second, FindControl looks for immediate children only, in your case children of the repeater item. slider is not one of those. Moreover, it is not a part of the repeater item template and should be accessible as in in code behind, so just
slider.Controls.Add(...
That is unless slider and the repeater you showed are a part of some other template of some "outer" control. In which case make sure to use that "outer" control to call FindControl on.
Finally, don't mess with id. I bet this is either going to be overridden by ASP.NET, or will cause issues on the page. Instead set client ID mode to static and assign ID property:
input.ClientIDMode = ClientIDMode.Static;
input.ID = string.Format("projectImage_{0}", item.ProjectImageId);
This is eventually output the same value for id you needed, but in more ASP.NET compliant way. One note though is that I replaced "-" with "_" - server side controls cannot have hyphens in ID
FindControl finds a control within another, but does so looking for the control's id. Your "slider" control has no id, it uses a class named "slider" but has no id.
You will need to define the control as
<div runat="server" id="Slider" class="slider">
<asp:Repeater ID="rptProjectImages" runat="server" OnItemDataBound="rptProjectImages_ItemDataBound">
<ItemTemplate>
</ItemTemplate>
</asp:Repeater>
</div>
The runat="server" tells the framework to instantiate that control in your code behind. The id will be the name of the object that is that control. Then in your code, you can do
htmlGenericControl input = new HtmlGenericControl("input");
input.Attributes.Add("type", "radio");
input.Attributes.Add("name", "slide_switch");
input.ID = string.Format("projectImage-{0}", item.ProjectImageId);
Slider.Controls.Add(input);
I have a text box
<asp:textbox runat="server" id="checkIn" ClientIDMode="Static" ReadOnly="true">
</asp:textbox>
The text in the text box is inputted through a Jquery DatePicker. In some code behind I am getting the text from this text box like so.
string x=checkIn.Text;
Why can I not pull the inputted date from the text box? I am guessing it is to do with the fact that it is readonly as when I remove this it works?
Can anyone help me?
In ASP.Net, if the readonly value is changed, it will revert to the original value on the postback.
You can use a wrokaround however, instead of specifying readonly declaratively, assign it as an attribute in code-behind. i.e.
instead of
<asp:textbox runat="server" id="checkIn" ReadOnly="true"...
apply this is code-behind
checkIn.Attributes.Add("readonly", "readonly");
But, the viewstate still may not work with this.
More info:
There is a subtle difference between readonly and disabled controls in HTML. The disabled ones will not be submitted with the form, however the readonly ones will. Literally, readonly is just readonly, but disabled is actually disabled.
From W3C: http://www.w3.org/TR/html401/interact/forms.html#h-17.12
(Get down to section 17.13.2 Successful controls under 17.13 Form submission)
ASP.Net however, reverts to the original value on postback if a control is declared like that i.e. if the attribute is set during init. Which is why setting the attribute later (in page load) will not affect this behavior.
Use HTML input tag instead of asp:textbox
Use this:-
<input type="text" readonly="readonly" runat="server" id="checkIn" clientidmode="Static"/>
Instead of this:-
<asp:textbox runat="server" id="checkIn" ClientIDMode="Static" ReadOnly="true"></asp:textbox>
Write the following code in your code behind file, for asp.net .cs or class file and for vb in .vb file.
You will have to write it on page load event, depending on if you want it before postback or after or irrespective of both...
textbox.Attributes.Add("readonly", "readonly");
Try to make readonly to false before posting the values through jQuery or Java-Script. It should work.
$('#tbox').removeAttr('readonly');
Suppose I have a asp:button then on client click I need to call a function which remove the read-only attribute from the text-box.
<asp:Button ID="MessageButton" runat="server" Text="Hellow"
OnClientClick="return changeAttribute()" />
<asp:textbox runat="server" id="checkIn" ClientIDMode="Static" ReadOnly="true">
</asp:textbox>
and change attribute function in javascript as follows
function changeAttribute()
{
$('#checkIn').removeAttr('readonly');
return true;
}
You can also leave the readOnly attribute off in the asp:TextBox control and use jquery $('#textbox').attr('readOnly','readOnly').
You can actually get the value of a readonly textbox if it is within the form.
var text = Page.Request.Form[TextBox.UniqueID];
Sorry this response is a few years late!
Apply in asp.cs Page : AttrName.Attributes.Add("readonly", "readonly");
Please use:
Request.Form[txtText.UniqueID]
I had the same issue with jQuery, however fixed with a trick:
$('#txtBoxID').removeAttr('readonly');
/// Do your stuff here..
$('#txtBoxID').add('readonly');
;)
I have an asp.net application. i have added Hidden field on Master Page..
<asp:HiddenField runat="server" ID="hiddenCriteria" Value="abcd"/>
When I try to get the value of Hidden field from Javascript :
alert(document.getElementById("ct100_hiddenCriteria").value);
I get the following value :
How to get real stored value ?
var labelID = '<%= hiddenCriteria.ClientID %>';
alert(labelID);
Try setting ClientIDMode to Static and it will output the ID of the control as hiddenCriteria
Makes it more JavaScript friendly.
You can use client id in the javascript function as follows
alert(document.getElementById('<%= hiddenCriteria.ClientID %>').value);
Or you can take benifit of ClientIDode to static as follow
<asp:HiddenField runat="server" ClientIDMode="Static" ID="hiddenCriteria"
Value="abcd"/>
and simply
alert(document.getElementById("hiddenCriteria").value);
For further reading
http://www.codeproject.com/Articles/34151/ASP-NET-4-0-Client-ID-Feature
Erm i am new to this. How do i pass the value the user enters into a text box to the vb code behind?
<input type="text" runat="server" id="amount" name="amount" size="15" />
No need to pass the value As its RunAt = server you can directly access value of the text box using its Text property
Example
amount.Value
or you can make use of Request collection to get the value of the textbox Request.Form["amount"]
Use the ASP.NET-TextBox Control.
<asp:TextBox ID="TextBox1" runat="server"/>
Then you can access it from codebehind via it's ID
Dim Textbox1Text As String = Me.TextBox1.Text
The Text will automatically persisted in ViewState across postbacks by default.
I have text boxes and it has values let say. I am calling my javascript method on one of textbox 'onblur'. my function is:
function CalculateExpectedProductPrice() {
alert("hi i called");
var originalPrice = document.getElementById('hdnSelectedProductPrice').value;
var numberOfLicenses = document.getElementById('txtNumberOfLicense').value;
var enteredAmount = document.getElementById('txtAmount').value;
alert(originalPrice);
alert(numberOfLicenses);
alert(enteredAmount);
}
i am getting alert message as ""hi i called". but not further.
But some i am not getting values of these controls.
*Edited:* My HTML is :
<asp:HiddenField ID="hdnSelectedProductPrice" runat="server" />
<asp:TextBox ID="txtAmount" runat="server" Width="250px"></asp:TextBox>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:TextBox ID="txtNumberOfLicense" runat="server" Width="35px" ></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtNumberOfLicense" EventName="" />
</Triggers>
</asp:UpdatePanel>
Will there any impact master-content page . because script is in content page and html also on same content page.Also let me know you, I am using wizard control where as all these controls are resides on second step of wizard. will that make any impact ?
Edited:
I think wizard control making here matter. As i started my firebug and review the generated html it assign the Id dynamically to those controls which are inside the wizard. thats why javascript unable to find the expected control .
eg for txtAmount text box which is inside the wizard control getting name as :
ctl00_ContentPlaceHolder1_Wizard1_txtAmount
but certainly i would not prefer to use this generated Id. So is there any remedy to find control inside the wizard control and get - set values ?
get id of the control as shown below
var enteredAmount = document.getElementById('<%=txtAmount.ClientId%>').value;
It's impossible to say for certain with your not having quoted your HTML (!), but the usual reason for this is confusion between the id and name attributes. document.getElementById works with the id attribute, but people tend to think it works with the name on input fields, which it doesn't (except for on IE, where getElementById is broken).
(The other thing to remember is that id values must be unique on the entire page, but looking at the IDs you quoted, I suspect you're okay on that front.)
Update: It works if you use ids:
HTML:
<form>
<input type='hidden' id='hdnSelectedProductPrice' value='10'>
<input type='text' id='txtNumberOfLicense' value='2'>
<input type='text' id='txtAmount' value='3'>
<br><input type='button' id='theButton' value='Click Me'>
</form>
Live copy
As T.J. mentioned we really need to see your html code, without seeing it it could be that you are looking for an elements attributes.
So lookup the element as you are already with
var element = document.getElementById('product');
Once you have the element you can query its attributes
var price = element.getAttribute('price');
If its "ASP.net server control" then you will have to do it like this:
var originalPrice = document.getElementById('<%=hdnSelectedProductPrice.ClientID %>').value;
if you use Asp.Net 4.0 and your textbox is unique on the entirepage you can add ClientIDMode="Static" in attribute of your textbox
<asp:TextBox ID="txtAmount" runat="server" Width="250px" ClientIDMode="Static"></asp:TextBox>