C# - Prevent The Post Back Vb And Javascript?

Jun 15, 2012

there must be a way to prevent the postBack then using the client side ) , i have a button when clicked it calls a javascript function from the code behind , but before it does this it post back the page , Question is : how can i skip the post back step and jump to the javascript part ?

<script type="text/javascript">
function hello(name) {
alert("hello world from javascript " + name)
return false;

[code]....

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Asp.net - If Button1 Caused Post Back Then?

Apr 5, 2010

I have a situation where I need to ignore parts of page load sub inside a isPostback = true. Basically inside the isPostBack I want something like if button1 caused postback.... do this else do this...

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

If IsPostBack = True Then

If TextBox1.Text <> String.Empty Then[code].....

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Asp.net Mvc - Post IDictionary Back To MVC Model

Dec 18, 2009

To make this easier I will use a concrete example using movies and genres. A genre can be associated with many movies. Genres can increase over time and so can movies.

The use case is as follows. The user wants to filter movies by selecting his/her desired genres.

So, I have a page where at the top there is a section where the user can pick any combination of genres to filter on using checkboxes. Below that is a list of movies that are in those genres.

In MVC I am trying to implement this using a ViewPage(of IDictionary(of Genre, Boolean)) where the boolean is whether or not a particular Genre has been selected for filtering.

I then go into loop that creates checkboxes for them to select:

<% for each genre As KeyValuePair(Of Genre, Boolean) in Model %>
<%=Html.Hidden("genre[" & i & "].Key", genre.Key.ID)%>
<%=Html.CheckBox("genre[" & i & "].Value", genre.Value)%>

[Code].....

I am aware this can be done using Ajax and I will most likely do it using Ajax but I would still like to know why this doesn't work.

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Get A Row Count And Post That Back To The Grid

Oct 1, 2009

Ok, so I have a small program I am building for my boss to keep track of workers at certain job sites. With the way the economy is going my boss wants to track who is showing up at specific sites (jobs) and try to even it out among all the employees - some are not working full time.

Anyway, I have two Access tables linked together with the main table being Employee Data. The second Table is Employee Jobs. Basically I have three forms. The main form on startup will show all of the employees in the company - this is basically a list of all added employees into the database (this is the second form - adding employee info). At a quick glance I would like to have the initial startup form, with grid - show employee info, show the number of jobs each employee has been assigned to. Would this be an SQL statement? How to I get a row count and post that back to the grid so it shows up on startup?

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Post Back To An MVC Controller Action Via Script?

Jul 11, 2011

Currently I have a aspx page that is defined as[code]...

How do I change this so that the javascript fires, runs my validation and then hits this controller action?

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Asp.net Mvc - Passing Record Id Into View And Then Getting Back On Form Post

Dec 9, 2011

MVC 3. VB.NET application.. I am trying to pass a id along to keep track of which record a file name needs to be saved in.. The problem is that the id is getting passed into the view but on post back to the controller it is being lost...I have hammered on this for hours now and I am stuck...

[Code]...

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ASP.NET UpdatePanel Lock All TextBox Controls After Post-back?

Nov 2, 2010

My code behind is VB.NET. I use ASP.NET UpdatePanel like the following. However, after the post-back, it locks TextBox controls , I cannot type anything, except when I move the mouse over and click on the TextBox.

why it locked all TextBox controls after the post-back?

Here's why I use UpdatePanel:

During the post-back, after inserting data into DB, set all TextBox text property to String.Empty After the form is submitted, the Panel pStudent should be refresh , not the entire page and the TextBox txtId should be in focus again.

here's the mark-up of the ASP.NET page: [URL]

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Jquery - Post Table Rows, Added Via Javascript To The Server In ASP.NET?

Oct 3, 2011

Access <asp:table> table rows added by javascript in asp.net webform . Apologies for the duplicate question but I'd really like an explanation why this is the case. It is probably due to my lack of understanding on how browsers process HTML tables on submission to the server.If I have a <HTML> table or an <asp:table> control on an aspx page and I add rows to it client-side using JQuery / Javascript, why can I not include these added rows in a post-back to the server?

I've been trying to get this to work and it looks like I can't do it based on the answer to the previous question. But can someone explain why this is the case? The table itself can be returned in the post-back but the only rows present are the rows that were part of the table when it was sent to the browser originally - it does not include the rows added by the browser.there was a way to include these new rows in the post-back, the same as any client-side user input?

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JQuery Ajax With ASP.NET MVC Action: Passing Arguments From JavaScript In POST

Mar 4, 2011

I have an ASP.NET MVC controller action with the following VB.NET signature:

[Code]...

If I'm trying to send an Ajax POST in jQuery to the ClosestCities action, what should my request look like? When I use the following code to POST to this action, in the debugger window of VS, position.longitiude and position.latitude are equal to 0.0 (0D):

[Code]...

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Asp.net - Prevent Firing The Code-behind Event From JavaScript?

Jul 22, 2011

I would like this ASP button control to stop calling its event handler when the JavaScript client method IsCorrectPrice() returns false.

<asp:Button ID="btnsubmit" runat="server"
Text="Submit" OnClientClick="javascript:IsCorrectPrice()"/>
btnsubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Handles btnsubmit.Click

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Prevent Users Viewing Javascript File?

Mar 16, 2011

I have built a vb.net web application. I have tried to make it secure, with all users requiring a password to get in. The only problem is that if anyone can guess (or detect using some kind of hacking tools) the url of the javascript file, they can download it and read it, without even having to log in first.

Is there any way that this can be prevented?

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Checkboxes Doesn't Post Back - Checkbox On GridView Always Returning False

Jan 22, 2012

I have a GridView with a Checkbox on the first column: Code: The thing is that the Checkbox.Checked always returns False. How can I get the checked state of the Checkboxes in this scenario? Or what would be the best approach into updating the aforementioned column? P.S. Note that click on the checkboxes doesn't post back. Nothing happens on the page until the user clicks Save (and that is the intended behavior).

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Javascript - OnClientClick Prevent Page Submission If Validation Errors?

Aug 8, 2011

I've written a JavaScript function which validates form input and highlights the input fields and displays any error messages, which I have tested and all works fine. i have called this function from the OnClientClick attribute of an asp:Button tag. However, if the JavaScript function determines there to be validation errors, I want to stop the form from submitting. How do I do this?

[Code]...

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Call Back To The Code Behind Method Using Javascript (properly)?

Mar 10, 2011

I am trying to call back to a code behind method using Javascript and it seems like the only way to do so is using the Page.ClientScript.RegisterClientScriptBlock() don't need to return any data back to the calling javascript function.

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Javascript - Writing Back A Function Through Response.Write()?

Apr 12, 2012

I am trying to return a javascript function using response.write in an aspx page. The problem is that the function i am returning has lots of quotes and they are conflicting with the repsonse.write syntax. Here is a sample code:

Response.Write(" If hello.StartsWith("H", StringComparison.InvariantCultureIgnoreCase) OrElse hello.StartsWith("W", System.StringComparison.InvariantCultureIgnoreCase) Then")

This is giving me a problem as the quotes inside are cutting off the response early. Is there a better way to do this?

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Page Should Not Post Back The Whole Page On Submit?

Feb 17, 2012

I have an ASP.NET page with a Submit button. When I click the button my code runs and then the page reload/refresh....the whole page gets posted back.

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Nov 5, 2010

I have this problem, I can create a setup for my app/database but everyone can open the backend file which is an MS Access database. I want it so we can only access the database using the frontend app.

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Jun 11, 2009

Having a problem with sending a file via HTTP post in vb.net. I am trying to mimic the following HTML so the vb.net does the same thing.[code]

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Nov 25, 2008

<edit on 10th March 2010.>

Changed thread type to QUESTION. I was then able to mark AS ANSWER the relevent post which now also immediately follows this post and so it is easier to find as suggested by forum user j2associates .

<edit> It is also my 3rd post in this thread, the 8th one up, of my posts, from the bottom ( for now ), as the forum format has changed yet again.I will leave the rest of this post( as is ) purely for historical reasons. I have been on these forums long enough to see 3 forum changes. <edit> 19th May, 2010> Link added to a video on the next line of text.

[code]....

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Jul 23, 2009

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May 10, 2012

We have a server application and a client application that communicates with each other using socket.

When the server application sends 2 messages about 16-31 ms apart, the 1st message is received by the client application with little delay (like 16-32 ms after it was sent). But the 2nd message is received by the client application a lot later (like 200 ms later) than when it was sent.

We already disabled Nagle algorithm (set NoDelay = True) in the socket in both the server and client application.

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Smtp :: Sending Back To Back Emails?

Jun 17, 2011

We are having problems with sending back to back emails on one of our web sites. The site is built with .net framework 2.0.We can send the first email without any problems on every try. But to send a second email you need to wait about 20-30 minutes.the problem.One thing we tried was changing the smtp email server. We tried a third party smtp server but the same problem persisted. So I think the problem is not with the smtp server but with our .net code.

Imports Microsoft.VisualBasic
Imports System.Net
Imports System.Net.Mail

[code].....

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Have A Slew Of IF Statements Back To Back?

Mar 2, 2011

I am creating an application that will be faced with multiple decisions to make and I want to know if it is possible to create around 20 if statements to excute or decide between before excuting?

The application will encounter multiple websites but each website will have the same elements but not neccessary in the same order so I was going to tell the app to loop through the IF statement and if the condition is met to run that sub routine where it starts over and loops through the IF statements until next condition is met.

Is this possible in VB.NET or is 20 or so IF statements to many to use at once?[code]...

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Records Back-to-back In A Msgbox?

Dec 19, 2010

I have a dBase file named PROBA, with two cells: "VNEV", "KNEV".I would like to see the records back-to-back in a Msgbox.

Imports System.Data
Imports System.Data.Odbc
Public Class FormCount1
Public Sub Recordszm() Handles MyBase.Load
'TODO: This line of code loads data into the 'DataSet1.PROBA' table. You can move, or remove it, as needed.

[Code]...

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C# - Show Hide Using Javascript On A Control Inside A ASCX Control In A Gridview (ASP.NET + Javascript)

Oct 8, 2010

I have written a web usercontrol (ascx). Inside, there is a Panel that I want to show/hide on click of a hyperlink inside the usercontrol. Normally, this is easy just by doing something like this (the onclick attribute is added to the hyperlink on prerender):

[Code]...

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VS 2010 : HTTP Webrequest Post Inside HTTP Webrequest Post?

Oct 6, 2011

Im trying to create a software which can post into yahoogroups.I've done trying to log in yahoomail but my problem is when I am going to post in yahoogroups, I am turning back in to yahoo log in page.

Here's my code so far:

Quote:

Imports System.IO
Imports System.Net
Imports System.Text

[code]....

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Dec 18, 2009

i am using this function to get link of page which refered current page (in Back Button)

[Code]...

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Jan 27, 2010

I need to figure out how to post/get with PHP within vb.net.

Net.WebRequestMethods has the post/get functions im pretty sure i need

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