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cart.js
请存为cart.js，并且和前部分html放在同一个目录中
//——————————————————————————
//
// file name : cart.js
//
// description: 购物车前台用javascript 函数库
//
// function list : on_cancel(txtamount , txtsum)—- 取消该项
// on_update() —- 更新数量
// on_del() —- 全部删除
// updatedate() —- 更新表单显示
// round() —- 四舍五入取指定小数位数
//
// aurthor: liuyunpeng
//
// date: 2000/09/03
//
// history: 2000/09/03 version 1.0
//
//——————————————————————————
//—————-code begin here——————————————
function on_cancel(txtamount , txtsum)
{
txtamount.value = 0 ;
txtsum.value = 0 ;
updatedata();
}
//更新表单显示
function updatedata()
{
var m_aamount = new array() ;
var m_aprice = new array() ;
var m_adiscount = new array() ;
var m_asum = new array() ;
var m_numtotal = 0 ;
var i , j , k , m;
i = 0 ;
j = 0 ;
k = 0 ;
m = 0 ;
//求数量
for (i = 0 ; i < document.frmorder .elements .length ; i ++ )
{
if (frmorder.elements [i].name.substring(0 , 9) == "txtamount")
{
m_aamount[j] = frmorder.elements [i].value ;
j ++ ;
}
if (frmorder.elements [i].name.substring(0 , 14) == "txtticketprice")
{
m_aprice[k] = round(frmorder.elements[i].value , 2) ;
k ++ ;
}
if (frmorder.elements [i].name.substring(0 , 14) == "hidticketdisco")
{
m_adiscount[m] = frmorder.elements[i].value ;
m ++ ;
}
}
for ( i = 0 ; i < k ; i ++)
{
m_asum[i] = round(m_aprice[i] * m_aamount[i] * m_adiscount[i] / 100 , 2);
}
//更新form
j = 0 ;
for (i = 0 ; i < document.frmorder .elements .length ; i ++ )
{
if (frmorder.elements [i].name.substring(0 , 6) == "txtsum")
{
frmorder.elements [i].value = m_asum[j] ;
m_numtotal = round(m_numtotal + m_asum[j] , 2);
j ++ ;
}
}
document.frmorder .txttotal .value = m_numtotal ;
return 0;
}
//更新数量
function on_update()
{
if (document.frmorder .btnupdate .value == "修改数量")
{
document.frmorder .btnupdate .value = "更新数量"
for (var i=0 ; i < frmorder.elements.length ; i++)
{
if (frmorder.elements [i].name.substring(0 , 9) == "txtamount")
{
frmorder.elements [i].disabled = false ;
frmorder.elements[i].style.borderstyle = "ridge ";
document.frmorder .btnbuy .disabled = true ;
document.frmorder .btncancel .disabled = true ;
document.frmorder .btncontinue .disabled = true ;
document.frmorder .btndel .disabled =true ;
}
}
}
else
{
//alert(document.frmorder .btnupdate .value) ;
document.frmorder .btnupdate .value = "修改数量"
var j = 0 ;
var m_aprice = new array();
var m_aamount = new array() ;
for (var i=0 ; i < frmorder.elements.length ; i++)
{
if (frmorder.elements [i].name.substring(0 , 9) == "txtamount")
{
frmorder.elements [i].disabled = true ;
frmorder.elements[i].style.borderstyle = "none";
document.frmorder .btnbuy .disabled = false ;
document.frmorder .btncancel .disabled = false ;
document.frmorder .btncontinue .disabled = false ;
document.frmorder .btndel .disabled = false ;
}
}
}
updatedata() ;
}
//全部删除
function on_del()
{
for (var i=0 ; i < frmorder.elements.length ; i++)
{
if (frmorder.elements [i].name.substring(0 , 9) == "txtamount")
{
frmorder.elements [i].value = 0 ;
}
}
updatedata();
}
//继续购物
function on_continue()
{
document.frmorder.submit();
}
//区收银台
function on_buy()
{
document.frmorder.submit();
}
//四舍五入，保留制定小数位数
function round(a_num , a_bit)
{
return( math.round(a_num * math.pow (10 , a_bit)) / math.pow(10 , a_bit)) ;
}
//———————code end——————————————————-
