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APEX: Managing APEX JavaScript Source Code

Oracle Tips by Burleson Consulting

Managing APEX JavaScript Source Code

Although JavaScript can be embedded almost anywhere within the HTML source code it is most commonly embedded between the <head> and </head> tags.  In HTML DB this area is identified in each application page in the HTML Header region of the Page Attributes page.

Embedding JavaScript "See JavaScript"  source code in HTML DB can be accomplished in any of 3 ways:

  • §       As In-Line source code in the HTML Header section of the page attributes for an application page.

  • §       As a Static File in Shared Components -> Static Files.

  • §       As a file in a directory on the machine hosting the HTTP Server.

By this point in the book you are familiar with creating the various objects so I won’t walk you through it.  To exercise the steps in this section you should create a new application with a region including two page items: 1) a USERNAME page item of type Text Field; 2) a PASSWORD page item of type Password (don’t use the Password (submits when Enter pressed) option).  Also create a button with the name SUBMIT in the region as Create a button in a region position.

The JavaScript we will be using in this section is shown in listing x.1 and is available in the on-line code depot so you don’t have to type it yourself.


<script language="JavaScript1.1" type="text/javascript">
   function setFocus(PageItem) {
   function validateLogin() {
      if (document.getElementById('P4_USERNAME').value == "") {
        alert("Login ID must have a value provided.");
      else if (document.getElementById('P4_PASSWORD').value == "") {
        alert("Password must have a value provided.");
      else {

<      Listing x.1 – JavaScript sample.


The code in Listing x.1 performs two functions.  One is to set the focus of the page item and the other is to validate the username and password page items are not null before the page is submitted for processing.

The button you created is going to be used to execute the validateLogin function.  If the validation is ok the function will then perform the SUBMIT for the page.

For more information on this topic, see the book "Easy Oracle HTML-DB Application Express ", the best book anywhere on expert APEX development:

APEX developer support:

For APEX development support just call to gat an Oracle Certified professional for all APEX development projects.


Easy Oracle HTML-DB Application Express
By Michael Cunningham & Kent Crotty

Only $27.95

Buy it now and get the code depot download




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