Validating text fields in javascript

In Java Script to check for different month lengths, particularly for February in leap years, you need quite a bit of extra code.I'm not going to show that here, but you can find a link to get started under References below. Each of these values is then tested against an allowed range (days: 1 - 31; months: 1 - 12; years: 1902 - 2018; and so on).This script only confirms that the input format is correct and that each individual value falls within its allowed range.These functions can even be included from an external javascript file so that the browser can cache them, and so the programmer isn't always copying and pasting.

You can find the details in Web Services using XMLHttp Request (Ajax) and related articles. It doesn't allow a space after minutes and before the am/pm example: " am" will get an invalid time. I modified the reg to the following: re = /^(\d): (\d)(:00)?

For example, when the date is checked, the return value, , is an array with elements 1 through 3 containing the day, month and year components of the input string.

For the time check, the array returned includes the hour (pos 1), minutes (pos 2) and, optionally, the am/pm string (pos 3).

This routine DOES NOT check that the date or time input values are valid, just that they match the required format (d/m/y and h:m). Once you're in control of the input format, it's a lot easier to check that the values are actually valid.

The function has been improved now so that the day, month and year values are checked to ensure that they're in the right ball-bark (ie. Also the year must be between 1902 and the current year.

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