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<!DOCTYPE html> <html> <body> <input type="text" id="myText" value="Some text.." onselect="myAlertFunction()"> <p>Click the button to select the contents of the text field.</p> <button type="button" onclick="mySelectFunction()">Select content</button> <p>The select() method of the HTML DOM Input Text Object selects the contents of the text field. When this happens, the onselect event fires, which will trigger the alert function.</p> <script> // Select the contents of a text field with id="myText" function mySelectFunction() { document.getElementById("myText").select(); } // Alert some text when the text in the text field has been selected function myAlertFunction() { alert("You selected some text!"); } </script> </body> </html>