Checking Value of Radio Button Group via JavaScript?
JavascriptHtmlFormsRadio ButtonJavascript Problem Overview
This may seem silly and downright stupid but I can't seem to figure out how to check the value of a radio button group in my HTML form via JavaScript. I have the following code:
<input type="radio" id="genderm" name="gender" value="male" />
<label for="genderm">Male</label>
<input type="radio" id="genderf" name="gender" value="female" />
<label for="genderf">Female</label>
How do I retrieve the value of gender
via JavaScript?
Javascript Solutions
Solution 1 - Javascript
Use document.querySelector() if you want to avoid frameworks (which I almost always want to do).
document.querySelector('input[name="gender"]:checked').value
Solution 2 - Javascript
In pure Javascript:
var genders = document.getElementsByName("gender");
var selectedGender;
for(var i = 0; i < genders.length; i++) {
if(genders[i].checked)
selectedGender = genders[i].value;
}
update
In pure Javascript without loop, using newer (and potentially not-yet-supported) RadioNodeList
:
var form_elements = document.getElementById('my_form').elements;
var selectedGender = form_elements['gender'].value;
The only catch is that RadioNodeList
is only returned by the HTMLFormElement.elements
or HTMLFieldSetElement.elements
property, so you have to have some identifier for the form or fieldset that the radio inputs are wrapped in to grab it first.
Solution 3 - Javascript
If you are using a javascript library like jQuery, it's very easy:
alert($('input[name=gender]:checked').val());
This code will select the checked
input with gender
name, and gets it's value
. Simple isn't it?
Solution 4 - Javascript
To get the value you would do this:
document.getElementById("genderf").value;
But to check, whether the radio button is checked or selected:
document.getElementById("genderf").checked;
Solution 5 - Javascript
If you wrap your form elements in a form tag with a name attribute you can easily get the value using document.formName.radioGroupName.value.
<form name="myForm">
<input type="radio" id="genderm" name="gender" value="male" />
<label for="genderm">Male</label>
<input type="radio" id="genderf" name="gender" value="female" />
<label for="genderf">Female</label>
</form>
<script>
var selected = document.forms.myForm.gender.value;
</script>
Solution 6 - Javascript
Try:
var selectedVal;
for( i = 0; i < document.form_name.gender.length; i++ )
{
if(document.form_name.gender[i].checked)
selectedVal = document.form_name.gender[i].value; //male or female
break;
}
}
for( i = 0; i < document.form_name.gender.length; i++ )
{
if(document.form_name.gender[i].checked)
selectedVal = document.form_name.gender[i].value; //male or female
break;
}
}
Solution 7 - Javascript
Another solution for ES5+
[...document.getElementsByName("gender")].find(input => input.checked).value;
Solution 8 - Javascript
Without loop:
document.getElementsByName('gender').reduce(function(value, checkable) {
if(checkable.checked == true)
value = checkable.value;
return value;
}, '');
reduce
is just a function that will feed sequentially array elements to second argument of callback, and previously returned function to value, while for the first run, it will use value of second argument.
The only minus of this approach is that reduce will traverse every element returned by getElementsByName
even after it have found selected radio button.
Solution 9 - Javascript
function myFunction() {
document.getElementById("text").value='male'
document.getElementById("myCheck_2").checked = false;
var checkBox = document.getElementById("myCheck");
var text = document.getElementById("text");
if (checkBox.checked == true){
text.style.display = "block";
} else {
text.style.display = "none";
}
}
function myFunction_2() {
document.getElementById("text").value='female'
document.getElementById("myCheck").checked = false;
var checkBox = document.getElementById("myCheck_2");
var text = document.getElementById("text");
if (checkBox.checked == true){
text.style.display = "block";
} else {
text.style.display = "none";
}
}
Male: <input type="checkbox" id="myCheck" onclick="myFunction()">
Female: <input type="checkbox" id="myCheck_2" onclick="myFunction_2()">
<input type="text" id="text" placeholder="Name">