[英]How to hide a drop down option based on the selection of another drop down in a form in HTML using Javascript
當從源中選擇選項德里時,這是我用來從下拉目標中隱藏選項德里的 JS 代碼
< script type = 'text/javascript' >
function getSelectValue(Source) {
if (Source != '') {
$(Destination option[value = '"+Source+"']).hide();
}
} <
/script>
這是我用於下拉菜單的 HTML 代碼
<div class="row">
<div class="col-sm-6">
<div class="card">
<div class="card-body">
<!-- Source -->
<h5 class="card-title">Source</h5>
<select name="Source" id="Source" required="required" onchange= "getSelectValue(this.value);">
<option value="Delhi">Delhi</option>
<option value="Kolkata">Kolkata</option>
<option value="Mumbai">Mumbai</option>
<option value="Chennai">Chennai</option>
</select>
</div>
</div>
</div>
<div class="col-sm-6">
<div class="card">
<div class="card-body">
<h5 class="card-title">Destination</h5>
<!-- Destination -->
<select name="Destination" id="Destination" required="required">
<option value="Cochin">Cochin</option>
<option value="Delhi">Delhi</option>
<option value="Hyderabad">Hyderabad</option>
<option value="Kolkata">Kolkata</option>
</select>
</div>
</div>
</div>
</div>
附言我在表格中使用過它
請找到以下解決方案
function getSelectValue(Source) { var optionsArr = []; var x = document.getElementById("Destination"); var txt = "All options: "; var i; for (i = 0; i < x.length; i++) { optionsArr.push(x.options[i].text); const options = $("#dest_span>select>option[value='"+x.options[i].text+"']").show(); } const options = $("#dest_span>select>option[value='"+Source+"']").hide(); } function getSelectValueDest(Dest) { var optionsArr = []; var x = document.getElementById("Source"); var txt = "All options: "; var i; for (i = 0; i < x.length; i++) { optionsArr.push(x.options[i].text); const options = $("#src_span>select>option[value='"+x.options[i].text+"']").show(); } const options = $("#src_span>select>option[value='"+Dest+"']").hide(); }
<html> <head> <meta charset="UTF-8" /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> </head> <body> <div class="row"> <div class="col-sm-6"> <div class="card"> <div class="card-body"> <.-- Source --> <h5 class="card-title">Source</h5> <span id="src_span"> <select name="Source" id="Source" required="required" onchange="getSelectValue(this.value)" > <option value="Delhi">Delhi</option> <option value="Kolkata">Kolkata</option> <option value="Mumbai">Mumbai</option> <option value="Chennai">Chennai</option> </select> </span> </div> </div> </div> <div class="col-sm-6"> <div class="card"> <div class="card-body"> <h5 class="card-title">Destination</h5> <!-- Destination --> <span id="dest_span"> <select name="Destination" id="Destination" required="required" onchange="getSelectValueDest(this.value)"> <option value="Cochin">Cochin</option> <option value="Delhi">Delhi</option> <option value="Hyderabad">Hyderabad</option> <option value="Kolkata">Kolkata</option> </select> <span> </div> </div> </div> </div> </body> </html>
添加代碼片段以供參考。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<div class="row">
<div class="col-sm-6">
<div class="card">
<div class="card-body">
<!-- Source -->
<h5 class="card-title">Source</h5>
<select
name="Source"
id="Source"
required="required"
onchange="getSelectValue(this)"
>
<option value="Delhi">Delhi</option>
<option value="Kolkata">Kolkata</option>
<option value="Mumbai">Mumbai</option>
<option value="Chennai">Chennai</option>
</select>
</div>
</div>
</div>
<div class="col-sm-6">
<div class="card">
<div class="card-body">
<h5 class="card-title">Destination</h5>
<!-- Destination -->
<select name="Destination" id="Destination" required="required">
<option value="Cochin" >Cochin</option>
<option value="Delhi" id="Delhi">Delhi</option>
<option value="Hyderabad">Hyderabad</option>
<option value="Kolkata">Kolkata</option>
</select>
</div>
</div>
</div>
</div>
</body>
<script>
function getSelectValue(elem) {
const value = elem.value;
if (value === "Kolkata") {
document.getElementById("Delhi").remove();
}
}
</script>
</html>
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