拒绝javascript表单验证中的空格

Reject spaces in javascript form validation

本文关键字：空格 验证 javascript 表单 拒绝      更新时间：2023-09-26

我使用以下表单验证，但如果在firstname/lastname/phone字段中使用空格，我想引发一个错误。有什么想法吗？

<script type="text/javascript">
function validateFormOnSubmit(theForm) {
var reason = "";
  reason += validateUsername(theForm.first_name);
  reason += validateLastname(theForm.last_name);
  reason += validateEmail(theForm.email);
  reason += validatePhone(theForm.phone);      
  if (reason != "") {
    alert("Some fields need correction:'n" + reason);
    return false;
  }
}
function validateUsername(fld) {
    var error = "";
    var illegalChars = /'d/; // allow letters, numbers, and underscores
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter a first name.'n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "The first name contains illegal characters.'n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}
function validatePhone(fld) {
    var error = ""; 
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter a phone number.'n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}
function validateLastname(fld) {
    var error = "";
    var illegalChars = /'d/; // allow letters, numbers, and underscores
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter a last name.'n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "The last name contains illegal characters.'n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}
function trim(s)
{
  return s.replace(/^'s+|'s+$/, '');
}
function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+'.[^@]*'w'w$/ ;
    var illegalChars= /['(')'<'>',';':'''"'[']]/ ;
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter an email address.'n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'Yellow';
        error = "Please enter a valid email address.'n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Yellow';
        error = "The email address contains illegal characters.'n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}
</script>

if(name.test(/'s+/g)){
   // there is one or more white spaces in the name
}

您使用illegalChars概念走在了正确的轨道上。但是，不同的验证方法并不一致。此外，RegEx不会像你想要的那样匹配。我建议在validateUsername中添加相同的逻辑，在所有验证方法中使用这些RegEx:

function validateUsername(val) {
    var illegalChars = /[^a-zA-Z0-9_]/;
    ...
}
function validatePhone(val) {
    var illegalChars = /[^0-9().-]/; // No spaces allowed
    // Or
    var illegalChars = /[^0-9]/; // Only numbers no spaces or dashes or (area code)
    ...
}

您是否已使用throw、try和catch对错误进行了管理？

function test() {
    throw new Error("Illegal Characters");
}
try
{
    test();
}
catch (e)
{
    alert(e); // Displays: "Error: Illegal Characters"
}
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