我将使用Vanilla JavaScript创建简单的验证表单,但是我有问题,我想先检查(“ entername”)字段,如果用户不会在其中输入任何字母,我想控制台日志消息(“输入名称”),效果很好,但如果该用户在控制台中返回字段(“输入名称”),则重新输入其名称后,我想返回(“不输入”)消息。
var userBtn = document.getElementById('checkuserinputs');
var checkUserName = document.getElementById('user-name').value;
var checkUserSurname = document.getElementById('user-surname').value;
var checkUserPhone = document.getElementById('user-mobile').value;
userBtn.addEventListener('click', function(){
if(checkUserName.length == 0){
console.log('enter name')
}else{
console.log('not enter')
}
})
<div class="container-fluid">
<div class="modal-costum-row">
<div class="enter-name-side">
<div class="input-row">
<input class="costum--input" type="text" id="user-name" name="user-nm" placeholder="entername">
</div>
</div>
<div class="enter-surname-side">
<div class="input-row">
<input class="costum--input" type="text" id="user-surname" name="surname" placeholder="entersurname">
</div>
</div>
</div>
<div class="enter-tel-numb-side">
<div class="input-row input--wide">
<input class="costum--input" type="tel" id="user-mobile" name="user-mobile" placeholder="enterphonenumber">
</div>
</div>
</div>
<button id="checkuserinputs">check input</button>
答案 0 :(得分:2)
您需要在单击按钮后获取值。如果将其放在click事件之外,则该值将永远不会更新。
var userBtn = document.getElementById('checkuserinputs');
userBtn.addEventListener('click', function () {
var checkUserName = document.getElementById('user-name').value;
var checkUserSurname = document.getElementById('user-surname').value;
var checkUserPhone = document.getElementById('user-mobile').value;
if (checkUserName.length == 0) {
console.log('enter name')
} else {
console.log('not enter')
}
})
<div class="container-fluid">
<div class="modal-costum-row">
<div class="enter-name-side">
<div class="input-row">
<input class="costum--input" type="text" id="user-name" name="user-nm" placeholder="entername" />
</div>
</div>
<div class="enter-surname-side">
<div class="input-row">
<input class="costum--input" type="text" id="user-surname" name="surname" placeholder="entersurname" />
</div>
</div>
</div>
<div class="enter-tel-numb-side">
<div class="input-row input--wide">
<input class="costum--input" type="tel" id="user-mobile" name="user-mobile" placeholder="enterphonenumber" />
</div>
</div>
</div>
<button id="checkuserinputs">check input</button>
答案 1 :(得分:1)
您需要在click函数回调中检索输入字段的值:
userBtn.addEventListener('click', () => {
const checkUserName = document.getElementById('user-name').value;
if(checkUserName.length === 0){
console.log('enter name')
} else {
console.log('not enter')
}
})
答案 2 :(得分:0)
将变量获取值更改为按钮单击功能,
var userBtn = document.getElementById('checkuserinputs');
userBtn.addEventListener('click', function(){
var checkUserName = document.getElementById('user-name').value;
var checkUserSurname = document.getElementById('user-surname').value;
var checkUserPhone = document.getElementById('user-mobile').value;
if(!checkUserName){
console.log('enter name')
}else{
console.log('not enter')
}
})
var userBtn = document.getElementById('checkuserinputs');
userBtn.addEventListener('click', function(){
var checkUserName = document.getElementById('user-name').value;
var checkUserSurname = document.getElementById('user-surname').value;
var checkUserPhone = document.getElementById('user-mobile').value;
if(!checkUserName){
console.log('enter name')
}else{
console.log('not enter')
}
})
<div class="container-fluid">
<div class="modal-costum-row">
<div class="enter-name-side">
<div class="input-row">
<input class="costum--input" type="text" id="user-name" name="user-nm" placeholder="entername">
</div>
</div>
<div class="enter-surname-side">
<div class="input-row">
<input class="costum--input" type="text" id="user-surname" name="surname" placeholder="entersurname">
</div>
</div>
</div>
<div class="enter-tel-numb-side">
<div class="input-row input--wide">
<input class="costum--input" type="tel" id="user-mobile" name="user-mobile" placeholder="enterphonenumber">
</div>
</div>
</div>
<button id="checkuserinputs">check input</button>