在PHP中实现级联下拉菜单应用JavaScript(无AJAX)的方法如下:
<form>
<select id="mainSelect" onchange="updateSubSelect()">
<option value="">请选择主选项</option>
<option value="option1">选项1</option>
<option value="option2">选项2</option>
<option value="option3">选项3</option>
</select>
<select id="subSelect">
<option value="">请选择级联选项</option>
</select>
</form>
updateSubSelect()
,该函数将根据主选项的选择更新级联选项的内容。例如:function updateSubSelect() {
var mainSelect = document.getElementById("mainSelect");
var subSelect = document.getElementById("subSelect");
// 清空级联选项
subSelect.innerHTML = "";
// 根据主选项的选择添加相应的级联选项
if (mainSelect.value === "option1") {
var option1 = document.createElement("option");
option1.value = "subOption1";
option1.text = "子选项1";
subSelect.add(option1);
var option2 = document.createElement("option");
option2.value = "subOption2";
option2.text = "子选项2";
subSelect.add(option2);
} else if (mainSelect.value === "option2") {
var option3 = document.createElement("option");
option3.value = "subOption3";
option3.text = "子选项3";
subSelect.add(option3);
var option4 = document.createElement("option");
option4.value = "subOption4";
option4.text = "子选项4";
subSelect.add(option4);
} else if (mainSelect.value === "option3") {
var option5 = document.createElement("option");
option5.value = "subOption5";
option5.text = "子选项5";
subSelect.add(option5);
var option6 = document.createElement("option");
option6.value = "subOption6";
option6.text = "子选项6";
subSelect.add(option6);
}
}
<!DOCTYPE html>
<html>
<head>
<title>级联下拉菜单</title>
<script src="script.js"></script>
</head>
<body>
<h1>级联下拉菜单</h1>
<?php
// PHP代码
?>
<form>
<select id="mainSelect" onchange="updateSubSelect()">
<option value="">请选择主选项</option>
<option value="option1">选项1</option>
<option value="option2">选项2</option>
<option value="option3">选项3</option>
</select>
<select id="subSelect">
<option value="">请选择级联选项</option>
</select>
</form>
</body>
</html>
以上代码实现了一个简单的级联下拉菜单应用,当选择主选项时,级联选项会根据主选项的选择进行更新。你可以根据实际需求修改JavaScript代码和HTML表单来适应不同的场景。
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