更改复选框时需要更新UI

Question

I have a situation where is have a Bootstrap 3 based page which has a checkbox on it:

<input type="checkbox" value="Y" id=userActive checked>

Before I display the form I want to set the correct state based on the value of the field in the database like so:

if (ra.active=='Y') {                
        $("#userActive").prop("checked",true);                
} else {                
        $("#userActive").prop("checked",false);                
} 

The problem is that the UI display of the form is always Checked (as if true). Actually it is always the value of the initial state. If I remove the CHECKED parameter from the HTML then the checkbox UI display will represent UNCHECK regardless of the value.

The actual DOM element is checked or unchecked correctly (which I can verify by posting the form). It is just the UI that is not being displayed correctly.

Answer 1

There is nothing wrong with your code, here it is working exactly as you describe. Perhaps you have some other code interfering or some special CSS styling on your checkboxes?

 //Some setup to mimic your code var ra = { active: 'N' }; if (ra.active == 'Y') { $("#userActive").prop("checked", true); } else { $("#userActive").prop("checked", false); } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css"> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script> <div class="container"> <div class="row"> <div class="col-xs-12"> <input type="checkbox" value="Y" id=userActive checked> </div> </div> </div>