The HTML DOM Column object is associated with the HTML <col> element. The Column object is used to get or set the properties of <col> element. The <col> tag is used only inside a <table> element.
Properties
Following is the property for column object −
Property | Description |
---|---|
Span | To set or return the span attribute value of a column. |
Syntax
Following is the syntax for −
Creating a Column object −
var a = document.createElement("COL");
Example
Let us see an example for the column object −
<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid blue; } #Col1{ background-color:pink; } </style> </head> <body> <h3>COL OBJECT</h3> <table> <colgroup> <col id="Col1" span="2"> <col style="background-color:lightgreen"> </colgroup> <tr> <th>Fruit</th> <th>Color</th> <th>Price</th> </tr> <tr> <td>Mango</td> <td>Yellow</td> <td>100Rs</td> </tr> <tr> <td>Guava</td> <td>Green</td> <td>50Rs</td> </tr> </table> <p>Click the below button to get span of the "COL1" col element</p> <button onclick="colObj()">COLUMN</button> <p id="Sample"></p> <script> function colObj() { var x = document.getElementById("Col1").span; document.getElementById("Sample").innerHTML = "The Col1 element has span= "+x; } </script> </body> </html>
Output
This will produce the following output −
On clicking COLUMN button −
In the above example we have created a table with 2 rows and 3 columns. The table overall has a style applied to it. Inside the table, we have two <col> elements with one having span equals 2 and other has an inline style applied to it. Since for the first <col> span equals 2, its style will apply to exactly two columns and the second <col> will apply its style to the remaining columns −
table, th, td { border: 1px solid blue; } #Col1{ background-color:pink; } <table> <colgroup> <col id="Col1" span="2"> <col style="background-color:lightgreen"> </colgroup> <tr> <th>Fruit</th> <th>Color</th> <th>Price</th> </tr> <tr> <td>Mango</td> <td>Yellow</td> <td>100Rs</td> </tr> <tr> <td>Guava</td> <td>Green</td> <td>50Rs</td> </tr> </table>
We have then created a button COLUMN that will execute the colObj() method when clicked by the user −
<button onclick="colObj()">COLUMN</button>
The colObj() method gets the first <col> element by using the getElementById() method on document object. It then gets the span attribute value of the <col> element and assigns it to the variable x. The span attribute value that is stored in variable x is then displayed in the paragraph with id “Sample” using the innerHTML property of the paragraph −
function colObj() { var x = document.getElementById("Col1").span; document.getElementById("Sample").innerHTML = "The Col1 element has span= "+x; }