HTML表单属性“名称”未在Firefox中定义

Question

Below is the sample code in my JSP page:

<form name = loginform method = post action="">
<table class=registerTable>
<tr>         
    <td>Username:</td></tr>
    <tr><td>
    <input name=user type=text class=usnm required size=28 maxlength=35 autocomplete="off" onblur="validateUser()" onkeyup="checkUsernameAvailability(this.value)"><br></td></tr>
    <tr><td>
    <span id = uerrmsg class = error></span><br></td></tr>
</table>
</form>

When onblur=validateUser() is called the following code executes:

function validateUser(){
if(loginform.user.value.length<5){
    document.getElementById("uerrmsg").innerHTML="minimum 5 characters";
    return false;
}else{
    document.getElementById("uerrmsg").innerHTML="";
    return true;
    }
}

Error Console in FF gives the following error

loginform is not defined

Please help me on this.

PS: Above code works in all other browser.

Answer 1

you can use input.getAttribute("name") to get name attribute of an input. This works for almost all browsers.

By the way, if you use getElementById, you must populate "id" field of input.

Answer 2

您应该使用document.loginform 。

Answer 3

You don't need the form for this. First give your input an id: id="user". Then you can access it using document.getElementById(), as you do with the element. something like this:

document.getElementById("user").value.length

Also, your code is very non-standard, for eg you should not put a " " (space) between the attribute (or it's value) and the = sign. And the attributes' values should be within quotes (Look at the source code of this page, for example).