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16.7 File Upload Controls

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ONCHANGE, ONSELECT, ONFOCUS, and ONBLUR

These attributes are used by browsers that support JavaScript to specify 

the action to take when the mouse leaves the textfield after a change has 

occurred, when the user selects text in the textfield, when the textfield 

gets the input focus, and when it loses the input focus, respectively. 

For example, the following code creates a file upload control. Figure

16 19 shows the initial result, and Figure 16 20 shows a typical pop up win 

dow that results when the Browse button is activated.