试图根据用户输入获得总金额 [英] Trying to get total amount based on user input

问题描述

我有一个用户可以提交表单的页面，工作正常，但我想要一个数量字段，用户可以在其中输入一个数字，在总数框中它将显示总数，因为他们更新数量。我想实现这一点，而不必重新加载页面。我认为JavaScript会是最好的做，但我不确定如何去做，因为我有JavaScript的经验。任何帮助非常感谢!!!

I have a page where a user can submit a form, that works fine, but I want to have a quantity field where the user can input a number and in the totals box it will show the total as they update their quantity. I would like to achieve this without having to reload the page. I am thinking javascript would be the best to do this, but I am unsure of how to go about doing it as I have 0 experience with javascript. Any help is greatly appreciated!!!

我的代码到目前为止：

    <form>
        <table align="center">
            <tr>
                <td colspan="3" align="center"><img src="<?php echo getProductImage($product_id); ?>" title="<?php echo getProductName($product_id); ?>" /></td>
            </tr>
            <tr>
                <td colspan="3"><br/></td>
            </tr>
            <tr>
                <td align="center">Quantity:</td>
                <td colspan="2"></td>
            </tr>
            <tr>
                <td><input type="number" min="64" max="9999" name="quantity" /></td>
                <td>&nbsp;&nbsp;@&nbsp;&nbsp;$<?php echo number_format((getProductPrice($product_id)/2),4); ?>/per item&nbsp;&nbsp;=&nbsp;&nbsp;</td>
                <td>Total Goes Here</td>
            </tr>
        </table>
    </form>

推荐答案

请参阅 this JSFiddle（注意添加的 data-product-price 属性）

See this JSFiddle (notice the added data-product-price attribute)

HTML

<table align="center">
    <tr>
        <td align="center">Quantity:</td>
        <td colspan="2"></td>
    </tr>
    <tr>
        <td><input type="number" min="64" max="9999" name="quantity" /></td>
        <td>&nbsp;&nbsp;@&nbsp;&nbsp;$345.50/per item&nbsp;&nbsp;=&nbsp;&nbsp;</td>
        <td data-product-price="345.50"></td>
    </tr>
</table>

JavaScript

JavaScript

$(function(){
    $("input[name='quantity']").on("input", function(){
        var $outputCell = $(this).parent().siblings("[data-product-price]").eq(0); 
        $outputCell.html((+$outputCell.data("product-price") * +$(this).val()).toFixed(2));
    });
});

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