Form not validating javascript Sex chatta nu


08-Dec-2014 04:13

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.

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.

In this example, the date fields will only accept input that matches the pattern 'dd/mm/yyyy' (this could just as easily be changed to 'yyyy-mm-dd' or 'mm/dd/yyyy'). form.starttime.value.match(re)) { alert("Invalid time format: " + form.starttime.value); form.starttime.focus(); return false; } alert("All input fields have been validated!

The time field will allow input starting with 'hh:mm' following by an optional 'am' or 'pm'. The code behind the form is as follows: function check Form(form) { // regular expression to match required date format re = /^\d{1,2}\/\d{1,2}\/\d{4}$/; if(form.startdate.value ! form.startdate.value.match(re)) { alert("Invalid date format: " + form.startdate.value); form.startdate.focus(); return false; } // regular expression to match required time format re = /^\d{1,2}:\d{2}([ap]m)? "); return true; } For each field in the form (first the dates, then the time field), a check is made as to whether the input is blank.

The year limitation would be used if you were asking for a date of birth or date of some recent event.If you're setting up a calendar of future events you would check that the year is the current year or greater.The code behind the form now is as follows: function check Form(form) { // regular expression to match required date format re = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/; if(form.startdate.value != '') { if(regs = form.startdate.value.match(re)) { // day value between 1 and 31 if(regs[1] (new Date())Full Year()) { alert("Invalid value for year: " + regs[3] + " - must be between 1902 and " + (new Date())Full Year()); form.startdate.focus(); return false; } } else { alert("Invalid date format: " + form.startdate.value); form.startdate.focus(); return false; } } // regular expression to match required time format re = /^(\d{1,2}):(\d{2})([ap]m)? = '') { if(regs = form.starttime.value.match(re)) { if(regs[3]) { // 12-hour value between 1 and 12 if(regs[1] 59) { alert("Invalid value for minutes: " + regs[2]); form.starttime.focus(); return false; } } else { alert("Invalid time format: " + form.starttime.value); form.starttime.focus(); return false; } } alert("All input fields have been validated!

When capturing information for insertion into a database, or use in other processing, it's important to control what the user can enter.

Otherwise you can end up with values in the database that have no relation to reality.



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