<select>
<option请选择</option>
<option>一</option>
<option>二</option>
<option>三</option>
<option>四</option>
<option selected="selected">五</option>
</select>
验证是否选择该下拉列表(“请选择”选项之外的选项),若没有选择,提示“请选择XXX”
JS代码怎么写
<option请选择</option>
<option>一</option>
<option>二</option>
<option>三</option>
<option>四</option>
<option selected="selected">五</option>
</select>
验证是否选择该下拉列表(“请选择”选项之外的选项),若没有选择,提示“请选择XXX”
JS代码怎么写
<option disabled="disabled">请选择</option>
<option>A</option>
<option>A</option>
</select>
<option>请选择</option>
<option>一</option>
<option>二</option>
<option>三</option>
<option>四</option>
<option selected="selected">五</option>
</select>
<script>
document.getElementById('sel').onchange = function(){
var value = this[this.selectedIndex].innerHTML;
if(value == '请选择'){
alert('请选择')
}
};
</script>
<select id="xuanz">
<option value="请选择">请选择</option>
<option value="香蕉">香蕉</option>
<option value="苹果">苹果</option>
<option value="橘子">橘子</option>
</select>JS代码: function hehe() {
var name = document.getElementById("xuanz").value;
if (name == "请选择") {
alert("请选择你要吃的水果");
} else {
alert("你想吃:"+name);
}
}