Php Javascript计算问题
我有这个功能,但我有问题Php Javascript计算问题,php,javascript,jquery,Php,Javascript,Jquery,我有这个功能,但我有问题 function calc(id) { var price = document.getElementById("hidden-output-"+id); var amount = document.getElementById("input-"+id); if(price.value=="") { price.value = 0; } if(b.value=="") { amount.value = 1; } var total = amount.value *
function calc(id)
{
var price = document.getElementById("hidden-output-"+id);
var amount = document.getElementById("input-"+id);
if(price.value=="")
{
price.value = 0;
}
if(b.value=="")
{
amount.value = 1;
}
var total = amount.value * price.value;
document.getElementById("output-"+id).value=total;
}
它不起作用,我也不知道为什么我不熟悉javascript
这是HTML和PHP
<?php
foreach($category->fetch_category() as $data){
$id = $data->id;
echo"<tr>";
echo"<td>";
echo"<center>";
echo"<input type=\"hidden\" value=\"$data->id\" />";
echo"<p><strong>".$data->cat_name."</strong></p>";
echo"</center>";
echo"</td>";
echo"<td>";
echo"<center>";
echo"<select>";
foreach($products->fetch_products($id) as $product)
{
$price = $product->price;
echo"<option value = $product->id onclick=\"UpdateRecord($product->id,$data->id)\">$product->p_name</option>";
}
echo"</select>";
echo"</center>";
echo"</td>";
echo"<td>";
echo"<center>";
echo"<input class=\"input-mini\" id=input-$data->id onkeyup=\"calc($data->id)\" type=\"text\" value=\"1\"/>";
echo"<input type=\"hidden\" id=\"$product->id\" value=\"$product->quantity\" />";
echo"</center>";
echo"</td>";
$i = 0;
foreach($products->fetch_products($id) as $pricer){
if ($i==1) break;
echo"<td>";
echo"<center>";
echo("<div id=\"output-$data->id\" ><p>$pricer->price</p></div>");
echo"<input type=\"hidden\" id=\"hidden-output-$data->id\" value=\"$pricer->price\"/>";
echo"</center>";
echo"</td>";
$i++;
}
echo"</tr>";
}
?>
这是一个项目:
在calc
函数中,什么是b.value
。这不是定义的
,这就是抛出错误且脚本未执行的原因
在calc3
函数中。您需要修改以下行
if(isNaN(number))返回代码>到<代码>编号=isNaN(编号)?0:number
选项没有onclick,在选择并读取值上使用onchange。这是两个不同的函数onclick=“UpdateRecord”not calc(),您在IE中测试过吗?我把它修好了没有变化。。。现在是如果(amount.value==“”)我将其更改为number=isNaN(number)?0:数字;同楠
<td>Total : <input class="span1" type="text" id="total_calc" readonly="true" /></td>
function calc3(id) {
var price = document.getElementById('hidden-output-'+id);
var numberField = document.getElementById('input-'+id);
numberField.onkeyup = numberField.onpaste = function() {
if(this.value.length == 0) {
document.getElementById('output-'+id).innerHTML = '';
return;
}
var number = parseInt(this.value);
if(isNaN(number)) return;
document.getElementById('output-'+id).innerHTML = number * price;
};
numberField.onkeyup();
};
// This one always return NaN
if(b.value=="")
{
amount.value = 1;
}