JavaScript Alert Show message From ASP NET Code-behind

Question

I am reading this JavaScript  Alert Show message  From ASP NET Code-behind  I am trying to implement the same  So I created a static class like this   using System  using System Collections Generic  using System Linq  using System Web  using System Data  using System Data SqlClient  using System Web  using System Text  using System Web UI   namespace Registration DataAccess       public static class Repository                    lt summary gt               Shows a client-side JavaScript alert in the browser                lt  summary gt                lt param name  message  gt The message to appear in the alert  lt  param gt           public static void Show string message                                    Cleans the message to allow single quotation marks                 string cleanMessage   message Replace                             string script     lt script type  text javascript  gt alert      cleanMessage        lt  script gt                        Gets the executing web page                 Page page   HttpContext Current CurrentHandler as Page                      Checks if the handler is a Page and that the script isn t allready on the Page                 if  page    null  amp  amp   page ClientScript IsClientScriptBlockRegistered  alert                                        page ClientScript RegisterClientScriptBlock typeof Alert    alert   script                                               On this line    string script     lt script type  text javascript  gt alert      cleanMessage        lt  script gt       It is showing me the error    Expected  And also on   page ClientScript RegisterClientScriptBlock typeof Alert    alert   script      Err  The type or namespace name  Alert  could not be found  are you missing a using directive or an assembly reference    What am I doing wrong here

User · Answer

you can use following code    StringBuilder strScript   new StringBuilder     strScript Append  alert  your Message goes here        Page ClientScript RegisterStartupScript this GetType    Script   strScript ToString    true

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private void MessageBox string msg        Label lbl   new Label        lbl Text    string Format    lt script type  text javascript  gt alert   0     lt  script gt   msg       Page Controls Add lbl

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Your code does not compile  The string you have terminates unexpectedly   string script     lt script type      That s effectively what you ve written  You need to escape your double quotes   string script     lt script type   text javascript   gt alert      cleanMessage        lt  script gt      This kind of thing should be painfully obvious since your source code coloring should be completely jacked

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You need to escape your quotes  Take a look at the  Special characters  section   You can do it by adding a slash before them   string script     lt script type   text javascript   gt alert      cleanMessage        lt  script gt      Response Write script

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Here is an easy way   Response Write   lt script gt alert  Hello    lt  script gt

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Calling script only can not do that if the event is PAGE LOAD event specially   you need to call  Response Write script    so as above  string script    alert      cleanMessage            Response Write script    will work in at least for a page load event for sure

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You need to fix this line   string script     lt script type   text javascript   gt alert      cleanMessage        lt  script gt       And also this one   RegisterClientScriptBlock  alert   script     lose the typeof thing

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And i think  the line   string cleanMessage   message Replace                does not work  it must be   string cleanMessage   message Replace                 You need to mask the   with a   and the   with another

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lt  --Java Script to hide alert message after few second -- gt       lt script type  text javascript  gt          function HideLabel                 var seconds   5              setTimeout function                      document getElementById   lt   divStatusMsg ClientID   gt    style display    none                  seconds   1000                   lt  script gt       lt  --Java Script to hide alert message after few second -- gt

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if u Want To massage on your code behind file then try this  string popupScript     lt script language JavaScript gt    popupScript     alert  Your Massage       popupScript      lt     popupScript     script gt    Page RegisterStartupScript  PopupScript   popupScript

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I use this and it works  as long as the page is not redirect afterwards  Would be nice to have it show  and wait until the user clicks OK  regardless of redirects        lt summary gt      A JavaScript alert class      lt  summary gt  public static class webMessageBox         lt summary gt      Shows a client-side JavaScript alert in the browser       lt  summary gt       lt param name  message  gt The message to appear in the alert  lt  param gt      public static void Show string message                  Cleans the message to allow single quotation marks        string cleanMessage   message Replace                     string wsScript     lt script type   text javascript   gt alert      cleanMessage        lt  script gt               Gets the executing web page        Page page   HttpContext Current CurrentHandler as Page             Checks if the handler is a Page and that the script isn t allready on the Page        if  page    null  amp  amp   page ClientScript IsClientScriptBlockRegistered  alert                          ClientScript RegisterStartupScript this GetType     MessageBox   wsScript  true              page ClientScript RegisterClientScriptBlock typeof webMessageBox    alert   wsScript  false

User · Answer

its simple to call a message box  so if you want to code behind or call function  I think it is better or may be not  There is a process  you can just use namespace  using system widows forms    then  where you want to show a message box  just call it as simple  as in C   like   messagebox show  Welcome

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The quotes around type  text javascript  are ending your string before you want to  Use single quotes inside to avoid this problem   Use this   type  text javascript

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Calling a JavaScript function from code behind  Step 1 Add your Javascript code   lt script type  text javascript  language  javascript  gt      function Func             alert  hello           lt  script gt    Step 2 Add 1 Script Manager in your webForm and Add 1 button too  Step 3 Add this code in your button click event   ScriptManager RegisterStartupScript this Page  Page GetType     text    Func     true

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Works 100  without any problem and will not redirect to another page   I tried just copying this and changing your message     Initialize a string and write Your message it will work string message    Helloq World   System Text StringBuilder sb   new System Text StringBuilder    sb Append  alert      sb Append message   sb Append         ClientScript RegisterOnSubmitStatement this GetType     alert   sb ToString

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if you are using ScriptManager on the page then you can also try using this   System Web UI ScriptManager RegisterClientScriptBlock this  this GetType     AlertBox    alert  Your Message      true

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This message show the alert message directly  ScriptManager RegisterStartupScript this GetType    showalert   alert  Only alert Message     true     This message show alert message from JavaScript function  ScriptManager RegisterStartupScript this  GetType     displayalertmessage    Showalert      true     These are two ways to display alert messages in c  code behind

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There could be more than one reasons for not working   1  Are you calling your function properly  i e    Repository Show  Your alert message      2  Try using RegisterStartUpScript method instead of scriptblock    3  If you are using UpdatePanel  that could be an issue as well   Check this topic 3 2

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try   string script     lt script type   text javascript   gt alert      cleanMessage        lt  script gt

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ClientScript RegisterStartupScript Page GetType     validation     lt script language  javascript  gt alert  ID Exists    lt  script gt

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Try this if you want to display the alert box to appear on the same page  without displaying on a blank page   ScriptManager RegisterStartupScript this  GetType     showalert    alert  Sorry there are no attachments      true

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string script     lt script type  text javascript  gt alert      cleanMessage        lt  script gt       You should use string Format in this case  This is better coding style  For you it would be   string script   string Format    lt script type  text javascript  gt alert   0     lt  script gt       Also note that when you should escape   symbol or use apostroph instead

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string script   string Format  alert   0       cleanMessage   if  page    null  amp  amp   page ClientScript IsClientScriptBlockRegistered  alert           page ClientScript RegisterClientScriptBlock page GetType     alert   script  true    addScriptTags

User · Answer

Try this method   public static void Show string message                         string cleanMessage   message Replace                                                Page page   HttpContext Current CurrentHandler as Page       string script   string Format  alert   0       cleanMessage       if  page    null  amp  amp   page ClientScript IsClientScriptBlockRegistered  alert                   page ClientScript RegisterClientScriptBlock page GetType     alert   script  true    addScriptTags                  In Vb Net  Public Sub Show message As String      Dim cleanMessage As String   message Replace                Dim page As Page   HttpContext Current CurrentHandler     Dim script As String   String Format  alert   0       cleanMessage      If  page IsNot Nothing And Not page ClientScript IsClientScriptBlockRegistered  alert    Then         page ClientScript RegisterClientScriptBlock page GetType     alert   script  True       addScriptTags        End If End Sub

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string script   string Format  alert   0       cleanMessage        ScriptManager RegisterClientScriptBlock this  this GetType     key name   script      true

User · Answer

You can use this method after sending the client-side code as a string parameter   NOTE  I didn t come up with this solution  but I came across it when I was searching for a way to do so myself  I only edited it a little   It is very simple and helpful  and can use it to perform more than 1 line of javascript jquery    etc or any client-side code  private void MessageBox string msg        Label lbl   new Label        lbl Text     lt script language  javascript  gt     msg       lt  script gt        Page Controls Add lbl       source  https   stackoverflow com a 9365713 824068

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