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Editing Tables On-the-Fly
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In dynamic HTML, table objects (that is, objects corresponding to a <table> element) have these properties and methods that you can use to edit their contents:
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tableObjectrows(index) Returns a collection (array) of the rows in the table tableObjectinsertRow(index) Inserts a new row Returns the inserted <tr> element (which will be empty), or null for failure If index isn t supplied, then the <tr> element will be inserted at the end
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Handling Dynamic HTML with Ajax
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tableObjectdeleteRow(index) Deletes a row The index value indicates the row index of the row to delete
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And here are the properties and methods for objects corresponding to table row objects (that is, objects corresponding to <tr> elements):
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tableObjectcells(index) Returns a collection (array) of the cells in the row tableObjectrow(index) Returns the row index of the row Useful for inserting and deleting rows tableObjectinsertCell(index) Inserts a new cell and returns the inserted <td> element (which will be empty), or null for failure If index isn t supplied, then the <td> element will be inserted at the end of the row tableObjectdeleteCell(index) Deletes a cell The index value indicates the position in the cell collection to delete
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Let s put editing tables on-the-fly to work in an example, editTablehtml This example will edit a table by adding new rows at the click of a button (and it ll work in Internet Explorer and Firefox) We start by displaying an HTML table:
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<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> </center> </body>
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Note that we ve given an ID to the table, "table1", which will allow us to access that table in JavaScript Let s add a button with the caption Add a new row that connects to a JavaScript function named createRow:
<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>
In the createRow function, we can get an object corresponding to table1:
<script language="javascript"> function createRow() { var table1 = documentgetElementById("table1"); } </script>
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Then we call the table object s insertRow method to insert a new row into the table this method returns the new row object so that we can work with it, adding cells to the row:
<script language="javascript"> function createRow() { var table1 = documentgetElementById("table1"); var newRow = table1insertRow(3); } </script>
Note that we re inserting row 3 here because the table already has three rows that is, rows 0, 1, and 2 Now we ve got a new row object to work with, and we ll do that by adding cells to it with the row object s insertCell method Each row in the table has four cells, cells 0, 1, 2, and 3 You can add cell 0 to the newly created row this way:
<script language="javascript"> function createRow() { var table1 = documentgetElementById("table1"); var newRow = table1insertRow(3); var newCell = newRowinsertCell(0); } </script>
The insertCell method returns the new cell object How do we add data to this new cell We can use its innerHTML property, as we ve done so often before with <div> elements:
<script language="javascript"> function createRow() { var table1 = documentgetElementById("table1"); var newRow = table1insertRow(3); var newCell = newRowinsertCell(0); newCellinnerHTML = "Fe"; } </script>
Ajax: A Beginner s Guide
That s fine we ve been able to insert text data into the cell we just inserted into the new row We can also create the other three cells in the row and add data to them as well:
<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"; } </script>
Great here s the entire example, editTablehtml:
<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";
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