Many times we need to show or hide an element based on the current state of a checkbox and for that we should first check whether the checkbox is checked or not.
This article will explain three methods by which you can determine whether the checkbox is checked or not using jQuery and javascript both.

Using checked selector jQuery
Select the checkbox using its id or class and then use jQuery’s :checked selector along with is function to know its checked value.
If is function returns true, then the checkbox is checked and if it returns false then the checkbox is not checked. Example,

<input id="dummy" checked="checked" type="checkbox" />
<script>
if($("#dummy").is(":checked") {
   console.log("Checked");
} else {
   console.log("Not checked");
}
</script>

Above code when executed will print Checked on the console.

:checked selector returns all the checkboxes that are checked on the current page. When a particular checkbox is selected using its id and :checked is placed inside is function, then its checked state is returned.

Learn different ways of selecting an element in jQuery here.


Using prop method in jQuery
prop method takes a property name as argument and returns the value of that property for an element. Pass the checked property of the checkbox as an argument to this method and it will return its value.
checked property will be true if the checkbox is in checked state and false if the checkbox is not checked. Example,

<input id="dummy" checked="checked" type="checkbox" />
<script>
if($("#dummy").prop("checked") {
   console.log("Checked");
} else {
   console.log("Not checked");
}
</script>

Remember that first you need to select the checkbox using its selector(id, in this case).

Using javascript
Use the checked property of an HTML element to know if a checkbox is checked or not. Select an element using document object in javascript and then use its checked property to get the checked value of the checkbox.
This property returns true if the element is checked, false otherwise. Example,

<input id="dummy" type="checkbox" />
<script>
if(document.getElementById("dummy").checked) {
   console.log("Checked");
} else {
   console.log("Not checked");
}
</script>

Above example uses getElementById method of document object to select the checkbox by its id and then its checked property is used to determine if it is checked.

This example will print Not checked at the console since the checkbox is not checked or not.

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