如何使用javascript验证输入 [英] How to validate input using javascript

问题描述

<script type="text/javascript">
function validate() {
    if (document.form.price.value.trim() === "") {
        alert("Please enter a price");
        document.form.price.focus();
        return false;
    }
    if (document.form.price.value !== "") {
        if (! (/^\d*(?:\.\d{0,2})?$/.test(document.form.price.value))) {
            alert("Please enter a valid price");
            document.form.price.focus();
            return false;
        }
    }
    return true;
}
</script>

<form action="" method="post" name="form" id="form" onsubmit="return validate(this);">

<input name="price"  type="text" class="r2" />
<input name="price2" type="text" class="r2" />
<input name="price3" type="text" class="r2" />
<input name="price4" type="text" class="r2" />
<input name="price5" type="text" class="r2" />
...more....
<input name="price50" type="text" class="r2" />

此javascript代码可以正常验证字段价格。

This javascript code is working fine to validate the field "price".

问题：

如何使代码作为全局验证工作？示例：将使用单个函数验证价格，price2，price3，price4，price5等。请告知我们：）

How to make the code to work as global validation? Example: would validate the price, price2, price3, price4, price5 etc.. with a single function. Please let me know :)

推荐答案

我的个人推荐是这样的：

My personal recommendation would be something like this:

<script type="text/javascript">
function validate() {
    return [
        document.form.price,
        document.form.price2,
        document.form.price3,
        document.form.price4,
        document.form.price5
    ].every(validatePrice)
}

function validatePrice(price)
{
    if (price.value.trim() === "") {
        alert("Please enter a price");
        price.focus();
        return false;
    }
    if (price.value !== "") {
        if (! (/^\d*(?:\.\d{0,2})?$/.test(price.value))) {
            alert("Please enter a valid price");
            price.focus();
            return false;
        }
    }
    return true;       
}
</script>

这篇关于如何使用javascript验证输入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！