根据下拉选择显示和隐藏表单中的字段可以通过以下步骤实现:
<select id="selectField">
<option value="option1">选项1</option>
<option value="option2">选项2</option>
<option value="option3">选项3</option>
</select>
<div id="formFields">
<input type="text" id="field1" name="field1" placeholder="字段1">
<input type="text" id="field2" name="field2" placeholder="字段2">
<input type="text" id="field3" name="field3" placeholder="字段3">
</div>
document.getElementById("selectField").addEventListener("change", function() {
var selectedValue = this.value;
// 隐藏所有表单字段
var formFields = document.getElementById("formFields").getElementsByTagName("input");
for (var i = 0; i < formFields.length; i++) {
formFields[i].style.display = "none";
}
// 根据选择的值显示相应的表单字段
if (selectedValue === "option1") {
document.getElementById("field1").style.display = "block";
} else if (selectedValue === "option2") {
document.getElementById("field2").style.display = "block";
} else if (selectedValue === "option3") {
document.getElementById("field3").style.display = "block";
}
});
#formFields input {
display: none;
}
这样,当下拉选择框的值发生变化时,相应的表单字段会根据选择的值显示或隐藏。
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