Call 'click()' to triger event

 
    
<html>
<body>
<script language="JavaScript">
    function function1() {
        myCheckbox.focus(); 
        myCheckbox.click();
    }
</script>
<input type="checkbox" id="myCheckbox" value="checkbox">
<button onclick="function1();">Click the checkbox</button>
</body>
</html>

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16.	Methods and Properties of the Checkbox Object
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Call 'click()' to triger event : CheckBox « Form Control « JavaScript DHTML

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