我觉得这很容易 - 帮助 [英] I thought this would be easy - HELP
问题描述
var theSel = document.forms [''price'']。elements [''cpu''];
var theVal = theSel.options [theSel.selectedIndex] .value;
var theSli = theVal.slice（1,3）;
这似乎不起作用
var cpus = document.forms [''price'']。 elements [''cpu''];
var cpusx = cpus.options [cpus.selectedIndex] .value;
var cpusxd = cpusx.slice（8,10） ;
当我使用事件处理程序时
onchange =" document.forms [''price'']。value = cost（ cpusxd，shpsxd）"
我收到错误消息：" cpudsx undefined
" EJ" < jo ******** @ hotmail.comwrote in news：1174703621.570832.232670
@ o5g2000hsb.googlegroups.com:
> var theSel = document.forms [''price'']。elements [''cpu''];
var theVal = theSel.options [theSel.selectedIndex] .value;
var theSli = theVal.slice（1,3）;
这似乎不起作用
var cpus = document.forms [''price'']。 elements [''cpu''];
var cpusx = cpus.options [cpus.selectedIndex] .value;
var cpusxd = cpusx.slice（8,10） ;
当我使用事件处理程序时
onchange =" document.forms [''price'']。value = cost（ cpusxd，shpsxd）"
我收到错误消息：" cpudsx undefined
检查你的拼写：（cpusxd vs. cpudsx）
变量名称的限制之一你不能发音。
另外，你的onchange代码没有任何提及您想要更改值的格式为
的元素。
" EJ" < jo ******** @ hotmail.comwrote in news：1174703621.570832.232670
@ o5g2000hsb.googlegroups.com:
> var theSel = document.forms [''price'']。elements [''cpu''];
var theVal = theSel.options [theSel.selectedIndex] .value;
var theSli = theVal.slice（1,3）;
这似乎不起作用
var cpus = document.forms [''price'']。 elements [''cpu''];
var cpusx = cpus.options [cpus.selectedIndex] .value;
var cpusxd = cpusx.slice（8,10） ;
当我使用事件处理程序时
onchange =" document.forms [''price'']。value = cost（ cpusxd，shpsxd）"
我收到错误消息：" cpudsx undefined
放一切在一个功能。在onchange事件发生后，变量cpus，cpusx，cpusxd必须是
。
函数myFunc = {
var cpus = document.forms [''price'']。elements [''cpu''];
var cpusx = cpus.options [cpus.selectedIndex] .value;
var cpusxd = cpusx.slice（8,10）;
document.forms [''price'']。elements [''something'']。value = cost（cpusxd，shpsxd）< br $>
}
onchange =" myFunc（）;"
3月24日，1 ：上午10点，Jim Land< rrrrfffftttt（no）@（垃圾邮件）hotmail.com>
写道：
" EJ" < jordane ... @ hotmail.comwrote in news：1174703621.570832.232670
@ o5g2000hsb.googlegroups.com：
将所有内容放入函数中。在onchange事件发生后，变量cpus，cpusx，cpusxd必须是
。
谢谢，但是为什么？
你也写道：
您是否尝试将总和插入隐藏元素？
document.forms [''price'']。elements [''amount'']，value = cpusxd + shpsxd;
这不产生一笔金额，或者更确切地说以下函数没有
产生一笔金额
函数总计（）
{
var cpus = document.forms [''price'']。elements [''cpu''];
var cpusx = cpus.options [cpus.selectedIndex] .value;
var cpusxd = cpusx.slice（6）;
var shps = document。形式[''price'']。elements [''shp''];
var shpsx = shps.options [shps.selectedIndex] .value;
var shpsxd = shpsx.slice（7）;
document.forms [''price'']。elements [''amount'']。value = cpusxd + shpsxd;
}
请注意：
< select name =" cpu" ID = QUOT; CPU和QUOT; onchange =" total（）;">
< option selected value =" AMDx - 2500">
< select name = QUOT; SHP" ID = QUOT; SHP" onchange =" total（）;">
< option selected value =" 3Day - 100">
....
onchange =" total（）;"返回2500100
var theSel = document.forms[''price''].elements[''cpu''];
var theVal = theSel.options[theSel.selectedIndex].value;
var theSli = theVal.slice(1,3);
this doen''t seem to work
var cpus = document.forms[''price''].elements[''cpu''];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(8,10);
when I use the event handler
onchange="document.forms[''price''].value=cost(cpusxd,shpsxd)"
I get the error message: "cpudsx undefined
"EJ" <jo********@hotmail.comwrote in news:1174703621.570832.232670
@o5g2000hsb.googlegroups.com:
>var theSel = document.forms[''price''].elements[''cpu''];
var theVal = theSel.options[theSel.selectedIndex].value;
var theSli = theVal.slice(1,3);
this doen''t seem to work
var cpus = document.forms[''price''].elements[''cpu''];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(8,10);
when I use the event handler
onchange="document.forms[''price''].value=cost(cpusxd,shpsxd)"
I get the error message: "cpudsx undefined
Check your spelling: ( cpusxd vs. cpudsx ) One of the limitations of
variable names you can''t pronounce.
Also, your onchange code lacks any mention of which element in the form
you want to change the value.
"EJ" <jo********@hotmail.comwrote in news:1174703621.570832.232670
@o5g2000hsb.googlegroups.com:
>var theSel = document.forms[''price''].elements[''cpu''];
var theVal = theSel.options[theSel.selectedIndex].value;
var theSli = theVal.slice(1,3);
this doen''t seem to work
var cpus = document.forms[''price''].elements[''cpu''];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(8,10);
when I use the event handler
onchange="document.forms[''price''].value=cost(cpusxd,shpsxd)"
I get the error message: "cpudsx undefined
Put everything in a function. The variables cpus, cpusx, cpusxd must be
evaluated after the onchange event happens.
function myFunc = {
var cpus = document.forms[''price''].elements[''cpu''];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(8,10);
document.forms[''price''].elements[''something''].value=cost(cpusxd,shpsxd)
}
onchange = "myFunc();"
On Mar 24, 1:10 am, Jim Land <rrrrfffftttt(no)@(spam)hotmail.com>
wrote:"EJ" <jordane...@hotmail.comwrote in news:1174703621.570832.232670
@o5g2000hsb.googlegroups.com:
Put everything in a function. The variables cpus, cpusx, cpusxd must be
evaluated after the onchange event happens.thanks, but why?
also you wrote:
Are you trying to insert the sum into the hidden element?
document.forms[''price''].elements[''amount''],value = cpusxd + shpsxd;this does not produce a sum, or rather the following function does not
produce a sum
function total()
{
var cpus = document.forms[''price''].elements[''cpu''];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(6);
var shps = document.forms[''price''].elements[''shp''];
var shpsx = shps.options[shps.selectedIndex].value;
var shpsxd = shpsx.slice(7);
document.forms[''price''].elements[''amount''].value = cpusxd + shpsxd;
}
please note:
<select name="cpu" id="cpu" onchange="total();">
<option selected value="AMDx - 2500">
<select name="shp" id="shp" onchange="total();">
<option selected value="3Day - 100">
....
onchange="total();"returns 2500100
这篇关于我觉得这很容易 - 帮助的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
