Friday, January 02, 2004|
Entering Line Breaks using the Label control and ASP.NET Received the following question that I thought would post: I am doing an ASP.NET Web Page and can’t seem to figure out how to put a line break in. I used to used VBCR, but for some reason it just doesn’t seem to work? What is up? Actually the answer is – HTML. Within ASP.NET label controls understand imbedded HTML within controls. So for example, if I wanted to place a break and maybe do some formatting within a label control I could use the following code. Label1.Text = "<h1>This is the first line </h1><br>" Label1.Text &= "<h2>This is the second line</h2> <br>" 9:52:14 PM 
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ASP.NET and Client Side JavaScript ASP.NET includes an extremely rich object model that covers most of what developers need for their development. The downside of the server side centric object model is that once a page is rendered to HTML on the client, there is no way to run any additional code until a server side postback is completed. Often this extra tip is not something that is desirable. Even though .NET doesn’t directly include any object references for directly creating JavaScript. You do have the ability to insert JavaScript code into a string and then register the code block on the page. Once the page is rendered the script block is inserted into the HTML and can be triggered from the client side. Some of the most common client side events are shown below. OnFocus – Occurs when a control receives focus OnBlur – Occurs when focus leaves a control OnClick – Occurs when the user clicks on a control OnChange – Occurs when the user changes value of certain controls OnMouseOver – Occurs when the user moves the mouse pointer over a control The code needed to insert script is added to the page load event of the web form. For example, here is an example of adding a JavaScript alert to a page using the OnMouseOver event.
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 'Create the variable that included the script Dim ClientScript As String = "<script language=JavaScript> function ShowInfo() {alert('Pointer on the control'); }</script>" ' register the script on the page If (Not IsClientScriptBlockRegistered("ShowInfo")) Then RegisterClientScriptBlock("ShowInfo", ClientScript) End If TextBox1.Attributes.Add("onMouseOver", "ShowInfo()") End Sub When the page is rendered the HTML now contains the script block as shown below.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <title>TestForm</title> <meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body MS_POSITIONING="GridLayout"> <form name="Form1" method="post" action="TestForm.aspx" id="Form1"> <script language=JavaScript> function ShowInfo() {alert ('Pointer on the control'); }</script> <input name="TextBox1" type="text" id="TextBox1" onMouseOver="ShowInfo()" style="Z-INDEX: 101; LEFT: 304px; POSITION: absolute; TOP: 168px" /> </form> </body> </HTML> 9:32:16 PM
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An Example of Using the On Switch Event Let’s say that I have an InfoPath form that has two views. For example, let’s call them “Main View” and “Lookup View”. One thing that I may want to do is run some code or perform a specific action when the user switches a view. For example, let’s say that I want to clear a particular field with a value. Using the On Switch Views event we can add the following code: function XDocument::OnSwitchView(eventObj){ switch(eventObj.XDocument.View.Name) { case "Main View" : case "Lookup View" : XDocument.DOM.selectSingleNode("//my:Field2").text = ""; } } 5:59:04 PM
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Last update: 6/28/2004; 6:33:35 PM .
