在JavaScript中創建正則表達式
[英]Creating a regular expression in javascript
問題描述
我正在嘗試進行表單驗證，在該過程中，我們檢查用戶輸入的輸入是否與正則表達式匹配，而不是表單應該通過的表達式。 現在，我正在嘗試驗證名稱字段，以便即使用戶輸入了至少2-15個字符，也可以包含空格。 應該不是/ ^ \\ w \\ s {2,15} $ /;
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Bottles Form</title>
<link rel="stylesheet" type="text/css" href="./css/form.css">
<script type="text/javascript">
function validFirstName() {
var fName = document.getElementById("customerName").value;
var regex = /^\w{2,15}$/;
if (regex.test(fName)) {
document.getElementById("firstNameAlert").innerHTML = "<span class='valid'>Valid</span>";
return (true);
} else {
document.getElementById("firstNameAlert").innerHTML = "<span class='error'>Error. First Name must be within 2 to 15 characters</span>";
return (false);
}
}
function formCalculator() {
const SALESTAX = .0825;
var userName = document.getElementById("customerName").value;
var quantity = document.getElementById("quantityBottle").value;
var costBottle = document.getElementById("costBottle").value;
var totalBottle = quantity * costBottle;
var discount = 0;
var discountedTotal = 0;
var taxTotal = totalBottle * SALESTAX;
var orderTotal = totalBottle + taxTotal;
//var orderWithDiscount = discountedTotal + taxTotal;
if(parseInt(quantity) > 10 && parseInt(quantity) <= 19) {
discount = .10;
totalBottle = totalBottle - (totalBottle * discount);
}
orderTotal.value = "$" + orderTotal.toFixed(2);
document.getElementById("result").innerHTML = "Hello " + userName + " - Your order of " + quantity + " bottles, costs $" + orderTotal.toFixed(2) + ", plus tax.";
}
</script>
</head>
<body>
<h1>Bottles Form</h1>
<form action="" method="post" enctype="multipart/form-data" name="wigetCalc">
<input name="customerName" id="customerName" type="text" size="20" onblur="validFirstName();"/> - <span id="firstNameAlert">First Name</span><br />
<input name="quantityBottle" id="quantityBottle" type="text" value="0" size="20" maxlength="3" /> Bottle Order Quantity<br />
<input name="costBottle" id="costBottle" type="text" value="5.31" size="20" readonly="readonly" /> Bottle Cost<br />
<p class ="coloredBox" onclick="formCalculator();">Submit</span></p>
<div id="result"></div>
</form>
</body>
</html>
2 個解決方案
解決方案1
2 2015-11-15 03:38:55
量詞與前面的標記匹配，該標記是當前正則表達式中的空格。 因此，您的正則表達式匹配一個字母，后跟2-15個空格。 您想使用字符集來匹配字母和空格（方括號）的任何組合。
/^[\w\s]{2,15}$/
解決方案2
0 2015-11-15 03:39:44
為什么不只使用長度？
var fName = document.getElementById("customerName").value;
if (fName.length >= 2 && fName.length <= 15) {
document.getElementById("firstNameAlert").innerHTML = "<span class='valid'>Valid</span>";
} else {
document.getElementById("firstNameAlert").innerHTML = "<span class='error'>Error. First Name must be within 2 to 15 characters</span>";
}
使用javascript中的正則表達式驗證要在Windows中創建文件的文件名
[英]Validating file name for creating file in windows, using regular expression in javascript
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