的PHP:onchange选项选择总更新 [英] php: onchange option select update total

问题描述

   <?php
    $price = 85;
    echo"
    <script type=\"text/javascript\">
    function updateHarga(){
        var input = document.getElementById(\"shipping\");
        var dropd = document.getElementById(\"dd\");
        input.value = parseInt(dropd.value);
    };
    </script>";
    $shipping ="<input type=\"text\" id=\"shipping\" value=\"$price\">";
    $total = $price+$shipping;
    echo "
    $total
        <br>
        Pilih Frame: <select name=\"$fr\" id=\"dd\" onChange=\"updateHarga()\">
        <option value=\"0\">Economy</option>
        <option value=\"10\">DHL +$10</option>
        <option value=\"15\">FEDEX +$15</option>
    </select>
    ";
    ?>

如何从$ price + $ shipping中更新$ total计算. $ price是来自mysql的查询，而$ shipping是来自选项select的. 在此之前，我使用javascript并正常工作.但我想计算并显示为变量$ total.问题出在$ shipping中，也许问题出在

How to update $total calculate from $price + $shipping. $price is query from mysql and $shipping from option select. before this i use javascript and worked. but i want calculate and display to variable $total. the problem is in $shipping, maybe problem is in the

$shipping ="<input type=\"text\" id=\"shipping\" value=\"$price\">";

因为不是字符串格式. 还有其他方法可以得到相同的结果吗?

because not string format. is there any other ways to get the same results?

谢谢.

推荐答案

此行$total = $price+$shipping;似乎多余.您正在将字符串添加到整数.字符串$shipping包含一个表单输入框，其值已经为$price.这样，在其余代码示例中的任何地方都不会使用$total.

This line $total = $price+$shipping; appears redundant. You are adding a string to an integer. The string $shipping contains a form input box with the value of $price already. $total is then not used any where in the rest of your code sample.

更新1

不确定我能完全理解，但是请尝试以下操作:

Not entirely sure I understand, but try this:

<?php
    $price = 85; //default shipping rate
    echo"
        <script type=\"text/javascript\">
            function updateHarga(){
                var input = document.getElementById(\"shipping\");
                var dropd = document.getElementById(\"dd\");
                var base_price = $price;
                input.value = parseInt(dropd.value) + base_price;
            };
        </script>
        <input type=\"text\" id=\"shipping\" value=\"$price\">
        <br>
        Pilih Frame: <select name=\"$fr\" id=\"dd\" onChange=\"updateHarga()\">
        <option value=\"0\">Economy</option>
        <option value=\"10\">DHL +$10</option>
        <option value=\"15\">FEDEX +$15</option>
    </select>
    ";
?>

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