如何在提交時向表單添加新的隱藏輸入字段

Question

當某些條件滿足時，我想在請求中傳遞某些隱藏參數。

比如，我想通過這些，如果這個條件爲真：

<script type="text/javascript"> 
function checkClosureLevel() 
{ 
    var openLevel = document.getElementById('openLevel'); 
    var phyCompLevel = document.getElementById('phyCompLevel'); 
    var finCompLevel = document.getElementById('finCompLevel'); 

    if (openLevel.checked) { 
     //PASS HIDDEN FORM VARIABLES HERE AND SUBMIT FORM 
    } 
} 
</script> 

<form action="process.det_details" method="post" name="detParameterForm"> 
    <fieldset class="det"> 
    <legend>Closure Level</legend> 
    <input type="checkbox" name="openLevel" >Open</input><br/> 
    <input type="checkbox" name="phyCompLevel" >Physically Complete</input> 
    <br/> 
    <input type="checkbox" name="finCompLevel" >Financially Complete</input> 
    </fieldset> 
</form> 

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