I want to call a server side method using __DoPostBack, but i don't want a hidden ASP runat server control in my page. Is it possible to call a server side method by its name and not by the name of the control that triggers it?
The problem is, I have an asp button on my aspx page with onclick="ExportButton_Click", and when the button is clicked, it calls the ExportButton_Click codebehind (server side) method. My problem is, I want to get rid of the asp button, because I am trying to create a button dynamically, which when clicked, will do the same thing. Right now, my dynamically created button is calling the doPostBack javascript function which targets the asp Button which triggers ExportButton_Click. So... is it possible to call the ExportButton_Click codebehind method with __doPostBack, without having an asp button? Thanks in advance.
Pass the event target argument in to the __DoPostBack('myEvent') method, like that.
Then in your code-behind Page_Load(), have somewhere code like this:
if (Request.Form["__EVENTTARGET"] == "myEvent")
{
//call your button click function, and pass the button to it (can pass null as the EventArgs)
Button1_Click(Button1, null);
}
These two methods are your server-side friends:
this.Page.ClientScript.GetPostBackEventReference
this.Page.ClientScript.GetPostBackClientHyperlink
They can be used to generate javascript to link to your server side events.
Related
how to display a btn after onUploadComplete event is executed? It's not coming now even I say btn.visible=true inside that event..
I read in one of the thread that this event happens asynchronously so we have to write javascript for it and call onClientUploadCompete.
But do anyone know how to do it withoiut writing javascript? please its urgent thanx in advance!
You've got two options - to execute client-side using JavaScript and AsyncFileUpload's OnClientUploadError and OnClientUploadComplete, or to handle the server-side UploadedComplete or UploadedFileError events fired by your AsyncFileUpload object.
If you choose client side, you can still include your Button as normal and include CSS for it to be display: none, which can be then altered in the JavaScript with something like the following:
$get(<%= AsyncFileUploaderInstanceName.ClientId %>).style.display = "block"
If you choose server side, you'll be able to refer to the .Visible property of whatever controls you like, and can alter them then. However, you'll have to update whatever UpdatePanel the button would be sitting in for the button to be rendered on the page.
I want to develop an application in asp.net with C#.
In that application there are one text box and one label.
I want the following functionality:
When I press any key in textbox then I should get this value on .cs page i.e; code behind. And from .cs page I want to add this value to the label.
The problem is that there is no keypress event for an asp textbox and if I take a html text box then I don't get its value on .cs page
How can I come out with this problem?
Because a keypress on a textbox is a client side event but you want to perform server-side processing you will need to use AJAX requests.
You may find the following useful:
AJAX Toolit
Using Jquery to call asp.net page methods
In asp.net the TextBox will have TextChanged event but you will need to enable post back for the button and the event will fire when you tab out of the TextBox.
For the task you want either use javascript or add a button and when this button is do what you want.
I don't think this is a good aproach in web app., In this way you will end with a lot of post-backs.
However, if you still want this functionality. Texbox has TextChanges event, and if you also change the textboxs's AutoPostBack property to true you will get something close, but you will still have to move a currsor.
But it is still a terible solution. Why don't you simply use a button that fires click event instead?
Alternative solution is to use Ajax or javaScript,..
You can simply create a JavaScript-Method for this.
Your Textbox:
<asp:TextBox ID="textBox" runat="server" onkeydown="onFilterTextChanged()">
</asp:TextBox>
Your JavaScript, do a TimeOut to not do this every 0,0001 secs.
function onFilterTextChanged() {
if (timeoutID)
window.clearTimeout(timeoutID);
timeoutID = window.setTimeout(updateFilterText, 600);
}
Send the Values to the CodeBehind, textis your TextBox-Text.
function updateFilterText() {
var text = document.getElementById("<%=textBox.ClientID %>").value;
__doPostBack("<%=textBox.ClientID%>", "CommandArg" + text);
}
You won't need to do as many PostBacks as with the native TextChanged-Event and you can simply use this e.g. for Auto-Extender-Plugins. Pack the TextBox into an UpdatePanel and you're good to go!
Unless of course you do not NEED to go back to the server, in which case just set the labeltext in updateFilterText.
I have an asp login page. When a user clicks a link I need it to call a function in a .cs file to dynamically create the url and redirect. How would I go about doing this?
I think this is what you're looking for.
you need to make use of postback. Add for example Button on the page and set property AutoPostBack=true, set it's Click event handler to be a method in your cs file (code behind) and use Response.Redirect() inside that handler
I have an ASP.NET application that also uses jQuery for modal pop-ups. If I put an ASP button (or image button) within the DIV for the jQuery modal, the "OnClick" event does not fire.
How can I fix this?
When you create the dialog, you need to move it a bit for ASP.Net, like this:
$(".class").dialog({
//options
}).parent().appendTo("form");
By default the .dialog() moves the content to just before </body> which most importantly is outside the <form></form>, so elements within it won't be included in the POST (or GET) to the server. If you manually move it like I have above, it'll resolve this issue.
By default, jQuery places the modal OUTSIDE of the asp.net <form> element.
You can easily append it to the form like:
$("#your-modal").parent().appendTo("form:first");
And this should fix your problems. It's a common problem with jQuery/ASP.NET.
Enjoy
Using asp.net, c# 3.5, vs 2008.
I have an aspx gridview called gv1 with a working c# codebehind onrowcommand method which is called when a button on the row is clicked.
The button on the gridview is being dynamically generated.
I am trying to replace that codebehind call with a javascript function to avoid a roundtrip to the server.
How do I do this?
So far I have tried
adding a row attribute in the code behind when I am dynamically generating the button in a foreach loop , which didnt work:
r.Attributes.Add("OnRowCommand", "javascript:gv1RowCommand(ID);");
the following which gives an error before running: no overloaded method takes 1 arg
<asp:GridView ID="gv1" runat="server" onrowcommand="gv1RowCommand(ID)" ...
various other things such as event onchange , onselected
I am using the follow javascript just to see if I can get it to be called:
function gv1RowCommand(ID) {
alert(
"row command");
}
You need to create object of your button first and then add attributes to it.
check below code -
foreach (GridViewRow row in gv1.Rows)
{
//Creates object of button inside your gridView Row
Button btnRowCommand = (Button)row.FindControl("YourButtonName");
//Adds Attribute to button- in this case adds onclick attribute
//which will fire the
//gv1RowCommand(ID); javascript function
btnRowCommand.Attributes.Add("onclick", "gv1RowCommand('"+ ID +"');");
}
Instead of
// dont use this code
r.Attributes.Add("OnRowCommand", "javascript:gv1RowCommand(ID);");
// dont use this code
This will cause your javascript function gv1RowCommand(ID) to fire when user clicks the button inside the gridview. If you need any more information of using javascript in gridView you can mail or reply. If the above code snippet is not enough for you, you can post much more code listing and will post the proper code accordingly.
Javascript events you can fiddle with:
Javascript Events
You don't have access to any of your page methods or properties in Javascript. You don't have access to anything persistant unless you're workng with Ajax... So there's not a lot that you'd do in RowCommand that you can usefully port to the client javascript layer.