当复选框被选中时，如何在金额前显示美元符号?

How can I show a dollar sign before the amount value when the checkbox is checked?

本文关键字：金额前 显示 美元 符号 复选框      更新时间：2023-09-26

未勾选时显示$0.00

当我选中复选框时，它将显示1.00。我想让它显示$1.00。我该怎么做呢?

JS Fiddle演示

这是代码:

<form id="form1" method="post">
<input type="text" id="totalcost" value="$0.00">
<input type="checkbox" value="aa_1">
<input type="checkbox" value="aa_2">
<input type="checkbox" value="aa_3">
</form>

<script type="text/javascript">
var clickHandlers = (function () {
    var form1 = document.getElementById("form1"),
        totalcost = document.getElementById("totalcost"),
// if this is always the last input in the form, we could avoid hitting document again with
// totalcost  = form1[form1.length - 1];
        sum = 0;
    form1.onclick = function (e) {
        e = e || window.event;
        var thisInput = e.target || e.srcElement;
        if (thisInput.nodeName.toLowerCase() === 'input') {
            if (thisInput.checked) {
                var val = thisInput.value, // "bgh_9.99"
                split_array = val.split("_"), // ["bgh", "9.99"]
                pay_out_value = split_array[1]; // "9.99"
                sum += parseFloat(pay_out_value); // 9.99

            }  else {
                if (thisInput.type.toLowerCase() === 'checkbox') {
                    var val = thisInput.value, // "bgh_9.99"
                    split_array = val.split("_"), // ["bgh", "9.99"]
                    pay_out_value = split_array[1]; // "9.99"
                    sum -= parseFloat(pay_out_value); // 9.99

                }
            }
            totalcost.value = (sum > 0) ? sum.toFixed(2) : "$0.00";
        }
    }
    return null;
}());
</script>

修改这一行:

totalcost.value = (sum > 0) ? sum.toFixed(2) : "$0.00";


totalcost.value = (sum > 0) ? "$" + sum.toFixed(2) : "$0.00";
                               ^

这将在你的价格前加上$ !

小提琴

只需在value后面加上$:

totalcost.value = (sum > 0) ? '$' + sum.toFixed(2) : "$0.00";

小提琴

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