我在选择" id"之后尝试显示两个测试字段从下拉列表中。它设置为隐藏,我试图让它在" id"被选中。不幸的是它没有用。请帮忙!
<form>
<input class="hidden" type="text" id="textField2">
<input type="text" id="textField">
<select id="select" name="selectData">
<option value="firstName">Name</option>
<option value="id">Id</option>
</select>
<input id="filter" type="button" value="Filter">
<script>
var temp = document.getElementById("textField2").value;
if(document.getElementById("select")[0].value === "id"){
temp.style.visibility = "visible";
}else {
temp.style.visibility = "hidden";
}
</script>
</form>
某处可能存在错误,或者可能还有其他(更好)的方法吗?
答案 0 :(得分:1)
您可以使用以下解决方案:
<form>
<script>
function toggle() {
var temp = document.getElementById("textField2");
//check for selected option.
if(document.getElementById("select").value === "id"){
temp.style.visibility = "visible";
} else {
temp.style.visibility = "hidden";
}
}
</script>
<input class="hidden" type="text" id="textField2" style="visibility:hidden;">
<input type="text" id="textField">
<select id="select" name="selectData" onchange="toggle()">
<option value="firstName">Name</option>
<option value="id">Id</option>
</select>
<input id="filter" type="button" value="Filter">
</form>