Find out how to check the state of a checkbox, looking if it is checked or not, using JavaScript Show
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āļø Like this article? Follow me on Twitter and LinkedIn. You can also subscribe to RSS Feed. In this tutorial, we will learn to check whether a checkbox is checked in JavaScript. The checkbox is the input type in the HTML, which works as the selection box. The radio buttons which belong to the same group allow users to select only one value. Still, the checkbox which belongs to the same group allows users to select multiple values. Also, you have many uses of checkboxes in your mind yourself. The HTML can add a checkbox to the webpage, but to add the behaviour to the checkbox, we must use JavaScript. Programmers can add different behaviours to the checkbox based on whether the checkbox is checked or not. Here, we will learn to check for the single and multiple checkboxes is selected or not. Check if a Single Check Box is Selected or notIn this section, we will learn to check whether the checkbox is checked or not. In JavaScript, we can access the checkbox element using id, class, or tag name and apply ā.checkedā to the element, which returns either true or false based on the checkbox is checked. SyntaxUsers can follow the below syntax to check single checkbox is selected or not. let checkbox = document.getElementById("checkbox_id"); let checkbox.checked; // it returns Boolean value ExampleIn the below example, we have created the checkbox. Also, we have added the event listener to the checkbox. When the user changes the checkbox's value, the event listener will be invoked. In the event listener, we will check for the checkbox is checked or not. If checkbox is checked, we will show some text to the div otherwise we will make the div empty.
In the above output, users can see that when they check the checkbox, it shows a message ācheckbox is checked.ā When they uncheck the checkbox, it shows nothing. Check if Multiple Checkboxes Are Selected or notIt is simple to add the behaviour to a single checkbox. On many websites, you have seen that when you see the popup to accept the terms & conditions, it has multiple checkboxes and when you select all checkboxes, only it enables the accept button. Here, we will do the same thing. We will create the multiple checkbox and check for all checkbox whether it is checked or not and on the basis of that, we will enable the button. Syntax
let checkbox = document.getElementsByName( "checkbox" ); let button = document.getElementById( "btn" );
for ( let i = 0; i < checkbox.length; i++ ) { checkbox[i].addEventListener( "change", () => { }); }
button.disabled = false; for ( let i = 0; i < checkbox.length; i++ ) { if ( checkbox[i].checked == false ) // if any single checkbox is unchecked, disable the button. button.disabled = true; } ExampleIn the example below, we have created the three checkboxes with the same name, which means all belong to the same group. Also, we have created the button in HTML and the accessing button and checkbox using the id and name in JavaScript. We have added an event listener in all checkboxes. When any checkbox value changes, it will check whether all checkbox is checked or not. If all checkbox is checked, the event listener enables the button. Otherwise, the button remains disabled.
In the above output, users can see that when they check all the checkboxes, button will be enable, otherwise button remains disabled. In this tutorial, we have learned how we can check whether single or multiple checkboxes are selected or not. We have added the different behaviour to the web page according to the checkbox selection value. Also, users can use the JavaScript libraries such as jQuery, so users need to make less effort to check for multiple checkboxes.
Updated on 08-Aug-2022 08:50:08
How do you find checkbox is checked or not?prop() and is() method are the two way by which we can check whether a checkbox is checked in jQuery or not. prop(): This method provides an simple way to track down the status of checkboxes. It works well in every condition because every checkbox has checked property which specifies its checked or unchecked status.
How call a checkbox is checked in JavaScript?ājavascript call function when checkbox is checkedā Code Answer's. //using plane javascript.. if(document. getElementById('on_or_off_checkbox'). checked) {. //I am checked.. //using jQuery.. if($('#on_or_off_checkbox'). is(':checked')){. //I am checked.. How do you check if a checkbox is checked or not in TypeScript?To check if a checkbox element is checked in TypeScript: Type the element as HTMLInputElement using a type assertion. Use the checked property to see if the element is checked. The property will return true if it is checked and false otherwise.
What is checkbox value if not checked?If the checkbox has the required attribute, but is not checked, then ValidityState.valueMissing will be true .
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