Apple WebObjects 3.5 - Manual (Page 27)

Binding Elements
27
5. Inspect the multi-line text area.
In Text Area Inspector, you can set various attributes corresponding to
those of a
</p><p style="position:absolute;top:238px;left:526px;white-space:nowrap" class="ft02"> element. </p><p style="position:absolute;top:274px;left:337px;white-space:nowrap" class="ft02">6. Increase the size of the element by specifying the number of columns </p><p style="position:absolute;top:294px;left:364px;white-space:nowrap" class="ft02">and number of rows to, say, 30 and 6.</p><p style="position:absolute;top:330px;left:337px;white-space:nowrap" class="ft02">7. Save the Main component.</p><p style="position:absolute;top:397px;left:126px;white-space:nowrap" class="ft04"><b>Binding Elements </b></p><p style="position:absolute;top:456px;left:337px;white-space:nowrap" class="ft08">When a user enters information in GuestBook’s form elements, your <br>application needs a way of accessing that information. This is done by <br><i>binding</i> the form elements to variables in your application. When the user <br>submits the form, WebObjects puts the data into the variables you’ve <br>specified. </p><p style="position:absolute;top:573px;left:337px;white-space:nowrap" class="ft08">Then, your application typically processes the data and returns a new page <br>(or the same page) displaying information that makes sense based on the <br>user’s input. The information displayed is usually represented by other <br>dynamic elements that are bound to variables and methods in your code.</p><p style="position:absolute;top:670px;left:337px;white-space:nowrap" class="ft08">This process of receiving a request (triggered by actions such as submitting <br>a form or clicking a hyperlink) and responding by returning a page is known <br>as the <i>request-response loop. </i>This loop is at the heart of WebObjects <br>programming.</p><p style="position:absolute;top:766px;left:337px;white-space:nowrap" class="ft08">In this tutorial, you’ll have WebObjects return the same page, with the <br>information you received from the user displayed, in a slightly different <br>format, at the bottom. In the second chapter, you’ll add an additional page <br>to your application.</p><p style="position:absolute;top:870px;left:337px;white-space:nowrap" class="ft06"><b>Creating Variables</b></p><p style="position:absolute;top:900px;left:337px;white-space:nowrap" class="ft02">In this section, you’ll declare individual variables in your code file (</p><p style="position:absolute;top:902px;left:785px;white-space:nowrap" class="ft07"><b>Main.java</b></p><p style="position:absolute;top:900px;left:832px;white-space:nowrap" class="ft02">) </p><p style="position:absolute;top:921px;left:337px;white-space:nowrap" class="ft08">to hold the name, e-mail address, and comments entered by a single guest. <br>Later on, you’ll structure this information differently in order to work with <br>data from multiple users.</p></div> </div> <div class="manual-page-original" itemscope="itemscope" itemtype="https://schema.org/ImageObject" data-img="/screens/564596/27.png" style="display: none;"> </div> </div> <a 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