To change the state flag , do the following:
document.getElementById("RememberMe").checked = true;
If you need to change the checkbox value , if you use an element input:
document.getElementById("RememberMe").value = "New Value";
However, you can set the default value and specify in the HTML markup:
<input id="RememberMe" name="RememberMe" type="checkbox" value="The Value" checked="checked" />
source
share