webforms

ASP.NET postback with JavaScript

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Here is a complete solution Entire form tag of the asp.net page <form id=”form1″ runat=”server”> <asp:LinkButton ID=”LinkButton1″ runat=”server” /> <%– included to force __doPostBack javascript function to be rendered –%> <input type=”button” id=”Button45″ name=”Button45″ onclick=”javascript:__doPostBack(‘ButtonA’,”)” value=”clicking this will run ButtonA.Click Event Handler” /><br /><br /> <input type=”button” id=”Button46″ name=”Button46″ onclick=”javascript:__doPostBack(‘ButtonB’,”)” value=”clicking this will run ButtonB.Click … Read more

Page_Load is firing twice in ASP.NET page

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Just ran into this problem, and thought I would post an answer summarizing what I found, plus my actual issue. 1. img tags with src=”” or Image tags with ImageUrl=”” 2. Using AutoEventWireup=”true” and adding a page handler 3. Having manually added the event handler (more common for C# than VB) 4. Handling both MyBase.Load … Read more

Adding Bundles to existing ASP.NET Webforms solution

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Simple solution, I had some typing errors. In the Site.Master I missed the ‘s’ from the end of bundles. Making my Site.Master look like this. <head runat=”server”> <asp:PlaceHolder runat=”server”> <%: Scripts.Render(“~/bundles/GlobalHead”) %> <%: Styles.Render(“~/Content/Global”) %> </asp:PlaceHolder> </head> <body> <%: Scripts.Render(“~/bundles/Global”) %> </body>

jQuery Validation plugin in ASP.NET Web Forms

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You can checkout the rules add function, but basically here’s what you can do: jQuery(function() { // You can specify some validation options here but not rules and messages jQuery(‘form’).validate(); // Add a custom class to your name mangled input and add rules like this jQuery(‘.username’).rules(‘add’, { required: true, messages: { required: ‘Some custom message … Read more

How to fix ASP.NET error “The file ‘nnn.aspx’ has not been pre-compiled, and cannot be requested.”?

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I’ve not had that error, but after a little Googling I came across this link, I’m not sure if you’ve seen it yet: http://forums.asp.net/t/956297.aspx Edit (adding the key text): This error will come when a reference is specified in web.config and deployment folder/site does not contain these dlls installed in the system or bin folder … Read more

Turning off the WebFormViewEngine when using razor?

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It is perfectly OK to remove the web forms view engine if you are not using it. You can do it like: public class Global : HttpApplication { public void Application_Start() { // Clears all previously registered view engines. ViewEngines.Engines.Clear(); // Registers our Razor C# specific view engine. // This can also be registered using … Read more

How do I prevent users clicking a button twice?

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If you simply disable the button then ASP.NET won’t post the form. Also you want to deal with client-side validation. Here’s my solution: <asp:Button runat=”server” ID=”btnSave” Text=”Save” OnClick=”btnSave_Click” OnClientClick=”if (!Page_ClientValidate()){ return false; } this.disabled = true; this.value=”Saving…”;” UseSubmitBehavior=”false” /> See @Dave Ward’s post for a description of UseSubmitBehavior. If you have multiple validation groups you’ll … Read more

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