Question

我正在尝试将学生的详细信息添加到firebase数据库中。当我单击 create 按钮时，即使在JavaScript中使用了 e.preventDefault（），页面也会刷新。怎么了？

HTML

<div id="Add" class="workspace">
        <h2 class="create">Enter Candidate Details</h2>
        <form id="stu-det-form">
        <input class="text1" id="cname" name="name" align="center" placeholder="Enter Candidate Full Name" required/><br>
        <input class="text1" id="cfname" name="fname" align="center" placeholder="Enter Father's Name" required/>
        <input class="text1" type="date" id="cdob" name="dob" align="center" placeholder="Enter DOB DD/MM/YYYY" required/><br>
        <select class="select1" id="cgender" name="gender">
            <option value="-Gender-">Gender</option>
            <option value="Male">Male</option>
            <option value="Female">Female</option>
            <option value="Undisclosed">Undisclosed</option>
        </select>
        <input class="text1" id="caddr" name="addr"align="center"  placeholder="Enter Candidate Address" required/><br>
        <input class="text1" id="cphno" name="phno" align="center" placeholder="Enter Candidate Contact Number" required/><br>
        <input class="text1" id="ceid" name="eid" align="center" placeholder="Enter Candidate Email Address" required/><br>
        <input class="text1" id="cpwd" name="pwd" align="center" placeholder="Enter Password" required/><br>
        <button class="btn-mar" id="add_btn">Create</button>
        </form>
</div>

JavaScript

const studet = document.querySelector('#stu-det-form');
studet.addEventListener('submit', (e) => {
e.preventDefault();
const name = document.getElementById("cname").value;
db.collection("candidates").doc(name).set({
  name: studet.name.value,
  fname: studet.fname.value,
  dob: studet.dob.value,
  gender: studet.gender.value,
  addr: studet.addr.value,
  phno: studet.phno.value,
  eid: studet.eid.value,
  pwd: studet.pwd.value
})
.then(function(docRef) {
  window.alert("Student Added Successfully");
})
.catch(function(error) {
    window.alert("Error Adding Student");
}); 
studet.reset();
});

Answer 1

如果您不希望提交表单，那么更好的方法是将事件附加到表单提交中，而不是将事件附加到表单提交中，而是在按钮上添加onclick事件并在其中运行Javascript。

<button class="btn-mar" id="add_btn" onclick="addStud()">Create</button>

function addStud(){
const studet = document.querySelector('#stu-det-form');

const name = document.getElementById("cname").value;
db.collection("candidates").doc(name).set({
  name: studet.name.value,
  fname: studet.fname.value,
  dob: studet.dob.value,
  gender: studet.gender.value,
  addr: studet.addr.value,
  phno: studet.phno.value,
  eid: studet.eid.value,
  pwd: studet.pwd.value
})
.then(function(docRef) {
  window.alert("Student Added Successfully");
})
.catch(function(error) {
    window.alert("Error Adding Student");
}); 
studet.reset();
}

Answer 2

您的代码绝对正确。看来您尚未将Javascript文件引用到HTML中。在这种情况下，请使用HTML文件底部的 script 标记（位于结束</body>标记上方）。在src属性中提供Javascript文件的相对路径。

<script src="script.js"></script>

没有其他原因，我在这里找到，因为您的代码看起来还不错。

const studet = document.querySelector('#stu-det-form');
console.log("Within the js document");
studet.addEventListener('submit', (e) => {
  console.log("Form Submitted");
e.preventDefault();
const name = document.getElementById("cname").value;

// studet.reset();
});

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div id="Add" class="workspace">
        <h2 class="create">Enter Candidate Details</h2>
  
        <form id="stu-det-form">
        <input class="text1" id="cname" name="name" align="center" placeholder="Enter Candidate Full Name"/><br>
        <input class="text1" id="cfname" name="fname" align="center" placeholder="Enter Father's Name"/>
        <input class="text1" type="date" id="cdob" name="dob" align="center" placeholder="Enter DOB DD/MM/YYYY"/><br>
        <select class="select1" id="cgender" name="gender">
            <option value="-Gender-">Gender</option>
            <option value="Male">Male</option>
            <option value="Female">Female</option>
            <option value="Undisclosed">Undisclosed</option>
        </select>
        <input class="text1" id="caddr" name="addr"align="center"  placeholder="Enter Candidate Address"/><br>
        <input class="text1" id="cphno" name="phno" align="center" placeholder="Enter Candidate Contact Number"/><br>
        <input class="text1" id="ceid" name="eid" align="center" placeholder="Enter Candidate Email Address"/><br>
        <input class="text1" id="cpwd" name="pwd" align="center" placeholder="Enter Password"/><br>
        <button class="btn-mar" id="add_btn">Create</button>
        </form>
</div>
<!-- Use script tag to reference your javascript file :) 
  <script src="./script.js"></script>
  -->
</body>
</html>

如何阻止页面在提交表单时刷新？

2 个答案: