CODEWITHSUNDEEP
javascripthtml
jan
jan

Reputation: 221

radio button return undefined value in javascript

Radio button is returning undefined value. my html code is : 

  <input name="start" value="" id="start1" type="radio">
  <label for="start1">date</label>

javascript: 

<script type="text/javascript">
    (function() {
        if (document.getElementById('start1').checked) {
            var CurrentDate = new Date();
            CurrentDate.setMonth(CurrentDate.getMonth() + 1);
        }
    });

</script>

when i check radio button start1 , then it will add 1 month to the current month. but my console.log(CurrentDate) shows undefined variable name. how can i show the result?

Upvotes: 2

Views: 859

Answers (3)

Animan
Animan

Reputation: 312

This will work for you.

Simple JavaScript - 

function check() {
    if (document.getElementById('start1').checked) {
        var CurrentDate = new Date();
        CurrentDate.setMonth(CurrentDate.getMonth() + 1);
        document.getElementById("dateDisplay").innerHTML = ""+CurrentDate;
    }
};
<input name="start" value="" id="start1" type="radio" oninput="check()">
<div id="dateDisplay"></div>

Upvotes: 1

ryanm
ryanm

Reputation: 451

What you have is an immediately-invoked function expression which runs as soon as it is defined - so it's going to run before you even have a chance to click on the radio button.

You need to attach an event listener to your radio button so that your function runs when the radio is clicked (or changed) instead.

Upvotes: 1

Илья Зелень
Илья Зелень

Reputation: 8108

You did not call the wrapper function

(function () {
    document.getElementById('start1').addEventListener('change', () => {
        let CurrentDate = new Date();
        CurrentDate.setMonth(CurrentDate.getMonth() + 1);
        dateEl.innerHTML = CurrentDate
    })
})();
<input name="start" value="" id="start1" type="radio">
<label for="start1">date</label>

<div id="dateEl"></div>

Upvotes: 1

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