"Graphite" geek programming Small Challenge #26: Implementing a Date Cascade dropdown selection Box

For more details, please refer to the original: http://www.gbtags.com/gb/share/5823.htm

the challenge for this issue:

The initial HTML code is as follows:

2. <select Name=' year ' id=' year '>
4. <option value="0">--</option>
6. <option value="1999">1999</option>
8. <option value=">"</option>
10. <option value="2001">2001</option>
12. </select> Year
14. <select name="month" id="month">
16. <option value="0">--</option>
18. <option value="1">1</option>
20. <option value="2">2</option>
22. <option value="3">3</option>
24. <option value="4">4</option>
26. <option value="5">5</option>
28. <option value="6">6</option>
30. <option value="7">7</option>
32. <option value="8">8</option>
34. <option value="9">9</option>
36. <option value="Ten"></option>
38. <option value="One"></option>
40. <option value=">"</option>
42. </select> Month
44. <select name="Date" id="Date">
46. <option value="0">--</option>
48. </select> Day

as follows:

The requirements are as follows:

When the year or month changes and is a valid value, the day drop-down selection box displays the number of days in the corresponding month.

When the year drop-down selection box is the initial state (that is, the value is 0), the month, day drop-down selection box must be the initial state (that is, the value is 0).

When the month drop-down selection box is the initial state (that is, the value is 0), the day drop-down selection box must be the initial state (that is, the value is 0).

Please write the implementation code for the above requirements

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For more details, please refer to the original: http://www.gbtags.com/gb/share/5823.htm

"Graphite" geek programming Small Challenge #26: Implementing a Date Cascade dropdown selection Box