在登录页面中,我想创建表单验证。
我写了下面提到的代码。但它不起作用。我希望隐藏注册按钮并在所有字段都不为空时显示按钮。
function signupbtnactive (){
var inputsignup = document.getElementsByClassName('input').val();
while(inputsignup != null && !inputsignup.isEmpty()) {
$('#signupbtn').show();
};
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="sign-up-htm">
<div class="group">
<label for="newloginusername" class="label">Username</label>
<input id="newloginusername" type="text" class="input">
</div>
<div class="group">
<label for="newloginusersname" class="label">Surname</label>
<input id="newloginusersname" type="text" class="input">
</div>
<div class="group">
<label for="newloginuser" class="label">Loginname</label>
<input id="newloginuser" type="text" class="input">
</div>
<div class="group">
<label for="newloginpwd" class="label">Password</label>
<input id="newloginpwd" type="password" class="input" data-type="password">
</div>
<div class="group">
<label for="newloginpwdconfirm" class="label">Repeat Password</label>
<input id="newloginpwdconfirm" type="password" class="input" data-type="password">
</div>
<div class="group">
<label for="loginemail" class="label">Email Address</label>
<input id="loginemail" type="text" class="input">
</div>
<div class="group">
<label for="loginemailcopy" class="label">Repeat Email Address</label>
<input id="loginemailcopy" type="text" class="input">
</div>
<div class="group">
<label for="dobsignup" class="label">Date of birth</label>
<input id="dobsignup" type="text" class="input" onblur="Checkemailsignup()">
</div>
<div class="group" id="signupdivbtn">
<input type="submit" class="button" id="signupbtn" value="Sign Up" style="display: none;">
</div>
</div>
&#13;
上面提到的不行。请指出什么是问题?
答案 0 :(得分:1)
var inputsignup = document.getElementsByClassName('inputField') ;
这将返回具有指定class.So的所有元素。您必须遍历每个元素并检查值是否为空
function signupbtnactive (){
var inputsignup = document.getElementsByClassName('inputField') ;
var flag = false;
for(var i in inputsignup){
if(inputsignup[i].value== '' ){
flag = true;
}else{
//console.log(inputsignup[i].value);
}
}
if(!flag) {
$('#signupbtn').show();
};
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="sign-up-htm">
<div class="group">
<label for="newloginusername" class="label">Username</label>
<input id="newloginusername" type="text" class="inputField">
</div>
<div class="group">
<label for="newloginusersname" class="label">Surname</label>
<input id="newloginusersname" type="text" class="inputField">
</div>
<div class="group">
<label for="newloginuser" class="label">Loginname</label>
<input id="newloginuser" type="text" class="inputField">
</div>
<div class="group">
<label for="newloginpwd" class="label">Password</label>
<input id="newloginpwd" type="password" class="inputField" data-type="password">
</div>
<div class="group">
<label for="newloginpwdconfirm" class="label">Repeat Password</label>
<input id="newloginpwdconfirm" type="password" class="inputField" data-type="password">
</div>
<div class="group">
<label for="loginemail" class="label">Email Address</label>
<input id="loginemail" type="text" class="inputField">
</div>
<div class="group">
<label for="loginemailcopy" class="label">Repeat Email Address</label>
<input id="loginemailcopy" type="text" class="inputField">
</div>
<div class="group">
<label for="dobsignup" class="label">Date of birth</label>
<input id="dobsignup" type="text" class="inputField" onblur="signupbtnactive()">
</div>
<div class="group" id="signupdivbtn">
<input type="submit" class="button" id="signupbtn" value="Sign Up" style="display: none;">
</div>
</div>
答案 1 :(得分:0)
<script>
//Set up the event listener to check every input when one changes
$(".group input").change(checkInputs)
//function that checks all the inputs for values
function checkInputs() {
let $signUpButton = $("#signupbtn")
let $inputs = $(".group input")
let numOfEmptyInputs = $inputs.filter((i, input) => !input.value).length
if(numOfEmptyInputs === 0) {
$signUpButton.show()
} else {
$signUpButton.hide()
}
}
</script>