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How to determine whether a certain item is checked in js

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Release： 2019-05-29 11:36:41
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js determines whether input checked is selected code example

checked attribute sets or returns whether the checkbox should be selected.

How to determine whether a certain item is checked in js

Syntax

checkboxObject.checked=true|false
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This attribute saves the current state of the checkbox. Whenever this value changes, onclick The event handler will be triggered (the onchange event handler may also be triggered).

Example

The following example can set the status of the checkbox: 

        <html>
        <head>
        <script type="text/javascript">
        function check()
          {
          document.getElementById("check1").checked=true
          }
        function uncheck()
          {
          document.getElementById("check1").checked=false
          }
        </script>
        </head>
        <body>
        <form>
        <input type="checkbox" id="check1" />
        <input type="button" onclick="check()" value="Check Checkbox" />
        <input type="button" onclick="uncheck()" value="Uncheck Checkbox" />
        </form>
        </body>
        </html>
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