I Have a LinkButton when clicked I want to preform an operation inside the OnPreRender method.
So how would I know if that LinkButton was clicked?
Say my LinkButton's name is lnkbtn1.
Thanks in advance.
Baher.
Your button's Clicked event would already have been called by the time you get to PreRender, so maybe use the Click event to set a private boolean property on your control to indicate whether the button was clicked, which you can then check later in PreRender.
Related
I am using a GridView in ASP.net with a pre-added buttons. The GridView's data source is from a list of BookingRowStatus
BookingRowStatus(Row, m_AStatus, m_BStatus, m_CStatus, m_DStatus, m_EStatus, m_FStatus)
The arguments that you can see are the Columns. I added RowCreated event to check m_XStatus to enable/disable the buttons depending on the text inside it ("X" = disable | "Y" = enable).
Next is I added a RowCommand event which should catch the event when a button in GridView is clicked. However, whenever I click the button, it invokes RowCreated instead of RowCommand. I added a break point on both of the said Events and I can see that it doesn't even pass RowCommand; it goes straight to RowCreated.
My question is how do I Invoke RowCommand when I press a button on the DataGrid?
The RowCreated event will fire before the RowCommand event is hit as the child controls (i.e. the rows) will be created on post back before you can access the values from them.
Set a breakpoint in both and see if they are both triggered.
Although your solution should work, an easier solution would be to bind the Button directly to the fields value. E.g.
<asp:Button runat="server" Enabled='<%# Eval("m_XStatus") = "Y" #>' />
Good day,
I have a problem in a .NET page where I am using an asp:textbox in combination with an OnClick action on a link button.
What happens is that after text has been entered into the textbox, if you directly click on the link button, more often than not the textbox is considered to be null.
If you click off the text box first then click the link, all is well and the save function performed by the link button proceeds as expected.
My assumption is that there is a lifecycle event that is being missed, or not applied which is not binding the text to the textbox for use in the codebehind when the link button is clicked.
The question is, what can i do to enforce that binding short of doing something like adding an onkeypress event to the textbox to force a postback.
There must be a more elegant solution.
Thank you in advance for your help.
Do you have initializations on your textbox inside Page_Load event? If so, use IsPostBack=false and put the initialization inside.
If IsPostBack =False Then
TextBox1.text=""
End If
I want to call Textbox.OnTextChange event without having to click a submit button or any button. How can I do this? As I enter text in the textbox, I want the ontextchange event to fire.
I would elaborate this further.I've a function for validating my entry in textbox which I'm calling ontextchange property.Now this function should be called without me changing focus from my textbox.
You can use onkeypress , onkeyup and onkeydown events for this.
http://www.w3schools.com/tags/tag_input.asp
Example :
<asp:TextBox ID="TextBox1" runat="server" onKeyPress="javascript:alert('Key Pressed');"></asp:TextBox>
you can set AutoPostBack to true on the textbox control. when the client side change event fires (when the focus changes from the textbox to something else), the page will do a postback automatically.
If you want a postback:
You want to use the onkeypress or onkeyup javascript event to run the __doPostBack javascript method. __doPostPack has some parameters you will need to look up on msdn
Otherwise just use the onkeypress or onkeyup javascript event to do whatever else it is you need with javascript.
We have a Datalist in which we have some data, with every Item we have a button control. What I want to achieve is that on the button click, the data related to that particular row of Datalist is fetched whose Button control is clicked. How to accomplish this? The problem is how to attach the button control with values related in that particular row? Note that I am using ArrayList as the Datasource since I am enabling padding via pageDataSource class...
Implement the OnDataBinding event for the Button. Then in the Button set the CommandArgument to something that will identify the row you are clicking. Then implement the OnItemCommand event for the DataList. You will be able to read the CommandArgument for the Button that was clicked and then perform whatever action you need.
I have an ASP:Button with an onclick event. Is it possible to detect that this button has been clicked on the Page_Init event?
If you know the ClientId of the button, you can check in the Request object. Otherwise, no. At the Page_Init stage, the page and child controls are only being loaded, and events will be handled only later.
Request.Form["_EVENTTARGET"]
You could try to use Request.Form["_EVENTTARGET"], it should hold the ID of the control that fired the PostBack.
The "button1" is the client id of your button. If Request.Params["button1"] does not return null then "button1" was clicked.