Export (0) Print
Expand All

Interacting with Client-Side Scripts

IIS 6.0

ASP's effectiveness can be extended by using it to generate or manipulate client-side scripts. For example, you can write server-side scripts that assemble client-side scripts based on server-specific variables, a user's browser type, or HTTP request parameters.

By interspersing server-side script statements within client-side scripts (enclosed by HTML <SCRIPT> tags), as shown in the following example template, you can dynamically initialize and alter client-side scripts at the request time:


<SCRIPT LANGUAGE="VBScript">    
<!-- 

variable = <%= 
server defined value %> 
. 
. 
. 

client-side script 

<%  
server-side script used to generate a client-side statement %>  

client-side script 
. 
. 
. 
--> 
</SCRIPT> 


Incorporating such functionality can produce some useful and interesting applications. For example, the following is a simple server-side script (written in VBScript) that manipulates a client-side script (written in JScript):


<% 
  Dim dtmTime, strServerName, strServerSoftware, intGreeting 

  dtmTime = Time() 
  strServerName = Request.ServerVariables("SERVER_NAME")  
  strServerSoftware = Request.ServerVariables("SERVER_SOFTWARE")  

  'Generate a random number.         
  Randomize 
  intGreeting = int(rnd * 3) 
%> 

  <SCRIPT LANGUAGE="JScript"> 
  <!-- 

  //Call function to display greeting 
  showIntroMsg() 

  function showIntroMsg() 
  {   
    switch(<%= intGreeting %>) 
    { 
    case 0: 
      msg =  "This is the <%= strServerName%> Web server running <%= strServerSoftware %>." 
      break 
    case 1:          
      msg = "Welcome to the <%= strServerName%> Web server. The local time is <%= dtmTime %>." 
      break 
    case 2: 
      msg = "This server is running <%= strServerSoftware %>." 
      break 
    }  

  document.write(msg) 

  } 

--> 
</SCRIPT> 


Scripts of this kind can be expanded, for example, to configure a client-side database or a DHTML personalization script. Innovative use of this technique can also reduce round-trips and server processing.

Show:
© 2014 Microsoft