<script>
function validate() {
var username = document.getElememtById("uname");
var password = document.getElememtById("pass");
if (username.value == "" || password.value == "") {
alert("no data");
}
}
</script>
<form>
<input id="uname" type="text" placeholder="username"></input>
<input id="pass" type="password" placeholder="password"></input>
<button onclick="validate()" type="submit">Submit</button>
</form>
最佳答案
使用e.preventDefault
防止默认行为,并且getElememtById
中也存在拼写错误
function validate(e) {
e.preventDefault();
var username = document.getElementById("uname");
var password = document.getElementById("pass");
if (username.value == "" || password.value == "") {
alert("no data");
}
}
<form>
<input id="uname" type="text" placeholder="username" />
<input id="pass" type="password" placeholder="password" />
<button button type='submit' onclick="validate(event)" type="submit">Submit</button>
</form>
关于javascript - 如何发现 JavaScript 中的表单验证不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54878821/