I have an ASP button, when I click this button, first I want to run code behind progress such as data delete, update..
After this progress, I want to runJquery function related this button.
How can I do that?
Your server-side event handler can call ScriptManager.RegisterStartupScript to invoke jQuery in the browser.
If I interpret your question correctly, you want to post back to the server so you can run your code, and when you return, you want to run some jquery. Is that correct?
If so, you'll need to inject some jquery into the response after you do your work.
So your code-behind will delete a record or run an update, then write some jquery to the response which will run when the page is built on the client. You might want to use the Page.RegisterStartupScript method to do this.
An alternative is to go down the ajax route, but that's a bit more complicated.
Related
I have a simple ASP.NET page with an image control and a button control. When someone clicks the button, I want the image to be shown, then the button can continue processing whatever it has to do, at the end of it's process it will hide the image again.
Is this possible? I've seen conflicting answers. I've tried using just the base code behind functionality and registering javascript functions on the fly (the javascript functions execute AFTER the button has completed all of its work, not before).
Thanks - Greg.
In normal scenario in asp.net it is not possible.
But there are many other way
User Update Panel and Update Progress from ajax tool kit and use those.
Use jQuery to call server side function and show updating image while ajax is processing.
Update Progress tutorila:- http://msdn.microsoft.com/en-us/library/bb386421%28v=vs.100%29.aspx
jQuery Page Method call :- http://weblogs.asp.net/craigshoemaker/archive/2008/11/07/using-jquery-to-call-asp-net-ajax-page-methods-by-example.aspx
Jquery Ajax Loading image
Yes it is possible. You should use ajax call rather than code behind which will be more complicated. Very roughly, on click of the button in the javascript do something like this:
function handleClickEvent(e){
$("#imgId").show();
$.ajax{
make ajax call here with right parameters;
success:function(){$("#imgId").hide();
}}
First , Use JavaScript function (OnclientClick , for button ) , to show the image. and then registering javascript functions to hide it from code behind.
I have a ASP.NET 3.5 web site with an AJAX update panel. I simply need to process some server side code and then issue a user prompt that says "Code processing complete".
I know there is supposed to be support for Msgbox-esque methods in ASP.NET but I can't find them and any other JavaScript based solutions don't work effectively when you have an update panel.
Help.
Couldn't find a direct example for this, so you can see how this is being used, and change it for your needs. On the client, there is a get_isInAsyncPostback() method to check if an updatepanel will be performing an async postback.
This link shows you how to cancel an update: http://www.asp.net/ajax/documentation/live/Tutorials/CancelAsyncPostback.aspx
Using the themes in this, instead of the beginRequest, you can tap into the endRequest event, and if an async postback, you can post an alert here. This assumes that the code works successfully, which are you adding that detection?
HTH.
MsgBox doesn't exist, but look at the javascript alert() function. That'll popup the message for you.
here is a link with more information on javascript popups
If you want to inject javascript from the server-side code, you can use this:
ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), Guid.NewGuid().ToString(), "alert('Code processing complete.');",True)
I am needing a piece of javascript to be run whenever a postback occurs. Well, actually multiple pieces. This is to be done inside a custom control, so the javascript code that should be run may be used a lot of times.
I currently have it so that the custom control will create a chain of "overrides" for the __onPostBack function. I feel this is pretty messy and it also does not handle regular post backs caused by Buttons.
tl;dr: What is the best way of executing a piece of javascript code when a postback happens? (that is, execute the code before the postback hits the server)
(Also, aiming for IE 7+ and Firefox compatibility)
You could set the onSubmit event on the form:
ClientScript.RegisterOnSubmitStatement(this.GetType(), "MyScript", "alert('Hello')");
Old and new way is described here: http://weblogs.asp.net/vga/archive/2004/03/01/NoMoreHijackingOfDoPostBackInWhidbey.aspx
I currently have a simple form that when you click the "save" button will persist it to the database.
I would like to use JQuery to do the callback for me and popup a "Save completed" div window/div of some sort.
My only problem is how do I call the btnSave_Click() event from JQuery?
If I use PageMethods the method would have to be static and therefore lose access to my textboxes and other page controls?
Thanks,
Goosey
Are you explicitly trying to avoid passing the values of the input controls? because that would be much easier.
Using a lightweight jQuery call to do the post but then expecting a full control hierarchy in the code behind to pull data out? What's the intent here? If you require that, it would probably be easier just to submit the page, and register javascript to run to pop the success message up on load.
Personally, I think the page method route and $.ajax or $.post is a much cleaner, separate way to solve the issue. That way you can just show the popup as part of the success callback.
You can use onClientClick
Have a look at the jQuery Form Plugin, it can change existing forms into Ajax forms.
You need to set __EVENTTARGET to the id of the control that you want to simulate causing the postback if you want to use the same handler. I seem to recall having to replace the underscores with dollar signs as well, but I could be wrong on that. The hidden inputs, __EVENTTARGET and __EVENTARGUMENT, are used by the framework to identify which control caused the postback. There's a nice discussion of the server side issues in this blog post, though it doesn't talk about AJAX. Google for __EVENTTARGET and postback for more info.
I have an asp.net server control (with the asp: in its definition). The button has been set to do post back.
On the server side, I have the on click event handler
e.g btnSave_click()
On the client side, I have a javascript function to be invoked on the click event
e.g btnSave.Attributes.Add("onclick","javascript: return CheckIsDirty();")
Am not sure which order these two will be executed. Because I want first on the client side to warn of any data entry fields that are not yet filled-out before actually saving any data.
Any help?
First client side, second server-side.
So you can use it.
I also use it in some cases, like:
close.Attributes["OnClick"] = "return confirm('Are you sure?')";
In this case if the user presses 'No' then the server-side event handler does not even play a role.
The trick here is to set this global variable "Page_IsValid" false if your test fails and this will stop the post back.
Read this page http://msdn.microsoft.com/en-us/library/aa479045.aspx which explains both server side and client Validation. There is sone good code example you can use.
The way you are setting your onClick JavaScript event will actually prevent it from posting back as you are overwritten the ASP.NET event handler. The correct way to accomplish the validation you are intending is to:
btnSave.Attributes.Add("onclick", "CheckIsDirty();" + GetPostBackEventReference(btnSave).ToString());
Notice that you append the result of GetPostBackEventReference, so that in JavaScript you first call your CheckIsDirty() method and then call the ASP.NET postback method. Assuming your method returns true, then the button will post. If it returns false then it will not cause a post back.
Does that sound like what you are trying to accomplish?
I think you need a much better understanding of what it means client side and what it means server side and how they all relate together. I've seen more and more developers make a mess of it.
Of course the client side will execute first in your case. Actually there's no way to execute it after the server code is executed (except if you do something manually). I'll try to give a brief explanation:
Whatever you have in your server, will generate some HTML on the client and the user is always interacting on the client. So you have a html button that the user is clicking. What the browser will do is execute the javascript associated with it or if no javascript is specified and the button is a submit button it will submit the form. if you check the generated html you will see that for the onclick event you will have the script you have added followed by some autogenerated script that actually will submit the form to the server. Your server side code will execute only if the page will be submitted.