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JavaScript

Tadjiev Codes
Tadjiev Codes
9,626 Points
Posted by Tadjiev Codes
Tadjiev Codes
9,626 Points

JS form validation Day, Month, Year onChange event according to the month

Hi, Dear folks, Could you please help me out to understand the problem like why my function"monthChanging" doesn't work through onchange embedded event in HTML.

Also function firstName() doesn't work let's say to output the name once onclick button pressed. This is the task I'm trying to do: Birth Month (Dropdown) Provide the months as strings - Birth Date (Dropdown) Provide the number of days relative to that months number of days - Birth Year (Dropdown) Provide the years in order from Higher to lower

When the month is changed: populate the date dropdown, with the correct number of days (for february, you need to check the year dropdown to see if its a leap year) Google the rules for leap year and number of days in the month

With a button click, Output the sentence to the log area With a button click, reset the form to default (empty) The link for the Workspace: https://w.trhou.se/34ofyzzw79 I just need help mostly with the months let's say if its Febraury 28 days and if other 7 months like 31 days shown in the days dropdown. The logic of my function seems to be not bad but how to connect it to another dropdown? LEt's sat if January selected then then days dropdown shows 31 if another month selected 30 if February then 28 days.

4 Answers

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

I see a few issues:

  • the arguments passed in are not being used
  • a default end date should be established before testing for exceptions
  • the element value should be tested with the month instead of the element itself
  • the date should be cleared before re-populating
  • the wrong months were being tested
  • "populateDropDownWithRange" still needs to be called after the end date is determined
        function monthChanging(Month, Date) {
            //updates the item to empty always 
            Date.innerHTML = "";
            var daysToPossessEnding = 31;

            if (Month.value === "April" || Month.value === "June" ||
                Month.value === "September" || Month.value === "November") {
                daysToPossessEnding = 30;

            } else if (Month.value === "February") {
                daysToPossessEnding = 28;
            }
            populateDropDownWithRange(1, daysToPossessEnding, Date);
        }

And there's no code for determining a leap year, you'll still need to add that.

Tadjiev Codes
Tadjiev Codes
9,626 Points
Tadjiev Codes
Tadjiev Codes
9,626 Points

Thanks a lot, Mr.Steven)))

I don't understand one thing from the code how the parameter Month check the values of the months like Month.value? Where it is exactly connected to the Month dropdown list? And calling the function 

 populateDropDownWithRange(1, daysToPossessEnding, Date);

connects it to that drop down starting number given 1, ending number 31 through a variable and theElement is the Date. Thanks

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

The parameter "Month" represents the argument "birthMonthSelector" used when the function is called from the HTML:

    <select id="ddBirthMonths" onchange="monthChanging(birthMonthSelector,birthDAteSelector)">

This same call connects "Date" to "birthDAteSelector".

Liam Clarke
Liam Clarke
19,938 Points
Liam Clarke
Liam Clarke
19,938 Points

Hello

What is it your trying to do? I don't understand what you are needing.

As for why the monthChanging() doesnt work, this is because the first parameter is not defined, monthChanging(month, this.value), month.

Can you please provide some more info as to what your expected result is?

Thank,

Tadjiev Codes
Tadjiev Codes
9,626 Points
Tadjiev Codes
Tadjiev Codes
9,626 Points

Hi Mr.Liam, I hope you're doing well) I'm looking for the days dropdown like 30 31 28 change according to the month. LEt's say I selected February so I want to have 28 days. If selected January then 31 days. I wanna add the Leap year function as well. And then output the result on the div. LEt's say First name: Andrew Lstname MCcebe and Born in 1990 and 30 October for Example. Thanks

Tadjiev Codes
Tadjiev Codes
9,626 Points
Tadjiev Codes
Tadjiev Codes
9,626 Points

Steven Parker
KRIS NIKOLAISEN
CAN YOU PLEASE HELP ME PLEASE? YOU'RE THE ONLY 2 FOLKS WHO GIVE SUPER HELPFUL RESPONSES)

Tadjiev Codes
Tadjiev Codes
9,626 Points
Tadjiev Codes
Tadjiev Codes
9,626 Points

Alrighty, Thank you very much. You really helped me out to understand this issue with this code)) Super helpful explanation)