Javascript 从html代码体调用js方法，并为方法引入变量_Javascript_Html

Javascript 从html代码体调用js方法，并为方法引入变量

javascript html

Javascript 从html代码体调用js方法，并为方法引入变量,javascript,html,Javascript,Html,我有以下html代码： <html> <title> Upload Malware File </title> <body> <header id = "header"> <h1 align="center">Upload Malware File</h1> <p align="center"> Please choose the malware file yo

我有以下html代码：

<html>
<title> Upload Malware File </title>
<body>
    <header id = "header">
        <h1 align="center">Upload Malware File</h1>
        <p align="center"> Please choose the malware file you want to upload.</p>
    </header>


    <form method="post" enctype="multipart/form-data" action="malware_upload.php">
        Select malware file to upload:
        <input type="file" name="file"required>

        <form method="post" enctype="multipart/form-data">
            <div >
                <label for="mname"><b>Malware Name</b></label>
    <input type="text" placeholder="Malware Name" name="mname" <required> *HERE*
            </div>
            <div >
                <label for="uname"><b>Admin Username</b></label>
                <input type="text" placeholder="Enter Username" name="uname" required>
            </div>

            <div>
                <label for="psw"><b>Admin Password</b></label>
                <input type="password" placeholder="Enter Password" name="psw" required>
            </div>
            <input type="submit" value="Upload" name="submit">
        </form>
    </form>

    <form>
        <input type="submit" formaction="file_upload.php" value="Go to File Uploads" />
        <input type="submit" formaction="CreateAdmin.php" name="SI" value="Sign In" />
    </form>

<form method="post" enctype="multipart/form-data">
        <input type="submit" name = "logout" value="Logout" /> 
        </form>

如何在html代码中的“HERE”标记处干净地调用checkMalwareName，并在错误为false时返回错误？

必须将函数绑定到元素的事件（

oninput

）：

改变

<input type="text" placeholder="Malware Name" name="mname" <required>

为什么选择使用oninput而不是onchange？@Riz waan，区别在于oninput
事件在元素的值更改后立即发生，而onchange事件在元素失去焦点、内容更改后发生。
<input type="text" placeholder="Malware Name" name="mname" <required>

<input type="text" placeholder="Malware Name" name="mname" oninput="checkMalwareName(this.value)" required >