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Yehuda Shiran July 13, 2002
Calling the IsPrime Web Service from DHTML
Tips: July 2002

Yehuda Shiran, Ph.D.
Doc JavaScript

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 In Column 106 we explained how to consume Web services through Microsoft Internet Explorer. There are three HTML items you need to add to your page to enable it to consume Web services:

  • onload="init()". Add this event handler to your BODY tag. For example: 

      <BODY BGCOLOR="#ffffff" onload="init()">
  • Instantiate the webservice behavior. You can share this behavior among all Web services you consume from your page:

      <DIV ID="myWebService" STYLE="behavior:url(webservice.htc)"></DIV>
  • GUI. Implement some way to collect user parameters and display the results. Simple INPUT elements will do.

The isprime TABLE has two rows. The first row includes an entry field for the number to be tested and a button to invoke the check. The second row includes a DIV element that displays the answer, via an innerHTML update. The ID of the input field is "testValue" and the ID of the result DIV is "theResult2". The button calls isPrimeNumber() when clicked. Here is the HTML code:

  <TABLE BORDER="0">
    <TR>
      <TD>Enter a number:</TD>
      <TD><INPUT SIZE="4" TYPE="text" ID="testValue" VALUE="0"></TD>
      <TD> </TD>
      <TD><INPUT VALUE="Click here to check if prime" 
	   TYPE="button" onclick="isPrimeNumber();"></TD>
    </TR>
    <TR><TD COLSPAN=4><DIV ID="theResult2"></DIV></TD></TR>
  </TABLE>
To learn more about JScript .NET, go to Column 112, JScript .NET, Part VI: Creating IE Web Services.

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