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Handling Dynamic HTML with Ajax
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newCell = newRowinsertCell(3); newCellinnerHTML = "Fum"; } </script> </head> <body> <center> <h1> Editing HTML Tables </h1> <table id="table1" border="2"> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> </table> <br> <input type="button" value="Add a new row" onclick="createRow()"> </center> </body> </html>
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You can see this example at work in Figure 8-13, where the table appears in its original state
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Ajax: A Beginner s Guide
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Figure 8-13 The original table in editTablehtml
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A new row appears at the bottom of the table when you click the button, as shown in Figure 8-14 Cool, now you know how to edit a table on-the-fly That s an exceptionally useful skill to have for Ajax applications, because you can update a table and even rewrite it with new data without refreshing the page
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Figure 8-14 Adding a new row in editTablehtml
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Handling Dynamic HTML with Ajax
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Remove Table Rows On-the-Fly
To truly be able to edit HTML tables on-the-fly, you need to know how to remove rows as well as add them Try using the deleteRow method to let the user remove a row after the user adds a new row Here s what the code looks like:
<html> <head> <title> Editing HTML Tables </title> <script language="javascript"> function createRow() { var table1 = documentgetElementById("table1"); var newRow = table1insertRow(3); var newCell = newRowinsertCell(0); newCellinnerHTML = "Fe"; newCell = newRowinsertCell(1); newCellinnerHTML = "Fi"; newCell = newRowinsertCell(2); newCellinnerHTML = "Fo"; newCell = newRowinsertCell(3); newCellinnerHTML = "Fum"; } function removeRow() { var table1 = documentgetElementById("table1"); table1deleteRow(3); } </script> </head> <body> <center> <h1> Editing HTML Tables </h1> <table id="table1" border="2"> <tr> <td>Fe</td>
(continued)
Ajax: A Beginner s Guide
<td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> </table> <br> <input type="button" value="Add a new row" onclick="createRow()"> <input type="button" value="Remove the new row" onclick="removeRow()"> </center> </body> </html>
Using documentwrite to Write Documents to the Browser
Another dynamic HTML method you should know about is the documentwrite method, which allows you to write to a web page from JavaScript Unlike the techniques you have seen earlier in this chapter, documentwrite is designed to write entire pages at once, not just update sections of a page Using documentwrite in Ajax applications, you can download and examine data from the server before writing the web page and, depending on that data, write different web pages Here s an example, restauranthtml, that shows how documentwrite can respond to current conditions In this case, we ll create for a restaurant a web page that displays a different menu breakfast, lunch, or dinner depending on the time of day This web page will be entirely written from JavaScript, so it has an empty <body> element:
<body> </body>
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Handling Dynamic HTML with Ajax
In the <script> element, we first determine what the current hour of the day is by creating a JavaScript Date object and using its getHours method:
<script language="JavaScript"> var currentDate = new Date(); var currentHour = currentDategetHours(); </script>
Next, we can write a header welcoming people to the restaurant ( Welcome to Our Restaurant ) using documentwrite:
<script language="JavaScript"> var currentDate = new Date(); var currentHour = currentDategetHours(); documentwrite( "<center>"); documentwrite( "<h1>"); documentwrite("Welcome to Our Restaurant"); documentwrite( "</h1>"); documentwrite( "</center>"); </script>
That s how it works you use documentwrite to write to the web page You can check what the hour of the day is, and write the web page to match For example, if the restaurant is currently closed, you can write the web page to reflect that:
<script language="JavaScript"> var currentDate = new Date(); var currentHour = currentDategetHours(); documentwrite( "<center>"); documentwrite( "<h1>"); documentwrite("Welcome to Our Restaurant"); documentwrite( "</h1>"); documentwrite( "</center>"); if (currentHour < 5 documentwrite( documentwrite( documentwrite( documentwrite( documentwrite( } </script> || currentHour > 23){ "<center>"); "<h1>"); "Sorry, we are currently closed" ); "</h1>"); "</center>");
Ajax: A Beginner s Guide
Or, if it s breakfast time, you can display the breakfast menu in, say, an HTML table:
<script language="JavaScript"> var currentDate = new Date(); var currentHour = currentDategetHours(); documentwrite( "<center>"); documentwrite( "<h1>"); documentwrite("Welcome to Our Restaurant"); documentwrite( "</h1>"); documentwrite( "</center>"); if (currentHour < 5 documentwrite( documentwrite( documentwrite( documentwrite( documentwrite( } || currentHour > 23){ "<center>"); "<h1>"); "Sorry, we are currently closed" ); "</h1>"); "</center>");
if (currentHour > 6 && currentHour < 12 ) { documentwrite( "<center>"); documentwrite( "<h2><i>We're now serving breakfast!</i></h2>"); documentwrite( "<table border bgcolor='aqua'>"); documentwrite( "<tr><th colspan = 2>Our Breakfast Menu</th></tr>"); documentwrite( "<tr><td>Fried Eggs</td><td>$350</td></tr>"); documentwrite( "<tr><td>Boiled eggs</td><td>$300</td></tr>"); documentwrite( "<tr><td>Waffles</td><td>$200</td></tr>"); documentwrite("<tr><td>Gruel</td><td>$250</td></tr>"); documentwrite( "<tr><td>Spinach</td><td>$250</td></tr>"); documentwrite( "</table>"); documentwrite( "</center>"); documentwrite( "</table>"); documentwrite( "</center>"); } </script>
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