我想停止重新加载页面时，我没有选择类别和点击提交按钮。有人能帮我吗？
null
function check() {
var select = document.getElementById("category").value;
if (select == -1) {
return alert("You didn't choose category !!!");
}
}<form action="#" method="POST" id="form" name="form">
<select name="category" id="category">
<option value="-1">Select category</option>
<option value="1">News</option>
<option value="2">Sport</option>
<option value="3">World</option>
<option value="4">Music</option>
</select>
<input type="submit" value="submit" id="submit" name="submit" onclick="check();" />
</form>null
您需要从函数返回false以防止表单被提交。
<input type="submit" value="submit" id="submit" name="submit" onclick="return check();" />
function check() {
var select = document.getElementById("category").value;
if (select == -1) {
alert("You didn't choose category !!!");
return false;
}
}
