如果选项为no，则需要条件下拉菜单，否则，只有其他选项出现，否则必须为null [英] Conditional dropdown is needed if the option is no then only the other should appear if not it must be null
本文介绍了如果选项为no，则需要条件下拉菜单，否则，只有其他选项出现，否则必须为null的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
<div class="form-group">
<label asp-for="son" class="control-label"></label>
@*<input asp-for="son" class="form-control" />*@
<select name="son" id="son">
<option value="none" selected="selected"> -- choose one --</option>
<option>Yes</option>
<option>No</option>
</select>
<span asp-validation-for="son" class="text-danger"></span>
</div>
如果上面的 id儿子的下拉列表为NO ，则仅出现下拉列表父亲的id .
If the above dropdown of id son is NO then only the dropdown id of father should appear.
<div class="form-group">
<label asp-for="father" class="control-label a"></label>
@*<input asp-for="father" class="form-control" />*@
<select name="father" id="father">
<option value="none" selected="selected"> -- choose one --</option>
<option>Signed SOW Awaited</option>
<option>Onboarding in Progress</option>
推荐答案
我认为您正在寻找的是jquery.这样，您可以检查#son是否设置为"no"(否).然后设置另一段代码来显示和隐藏.这是一段看起来很像您想要的代码:
I think what you are looking for is jquery. With this, you can check if the #son is set to "no" and then set another piece of code to show and hide. Here is a piece of code that should look a lot like what you want:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<body>
<div class="form-group">
<label asp-for="son" class="control-label">Son</label>
<select name="son" id="son">
<option value="none" selected="selected"> -- choose one --</option>
<option value="yes">Yes</option>
<option value="no">No</option>
</select>
<div id="father" style="display: none;">
<label asp-for="father" class="control-label a">Father</label>
<select name="father">
<option value="none" selected="selected"> -- choose one --</option>
<option>Signed SOW Awaited</option>
<option>Onboarding in Progress</option>
</select>
</div>
</div>
<script>
$("#son").change(function() {
if ($(this).val() === "no") {
$("#father").show();
} else {
$("#father").hide();
}
});
</script>
</body>
</html>JQuery最初可能有点吓人，但我建议您坚持这样的基础知识.这也是我对JQuery所了解的全部内容.
JQuery might be a little intimidating at first, but I suggest just sticking to the basics like this. This is also pretty much all I know about JQuery.
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