我需要创建一个计算器,根据哪个字段有条目调用不同的函数。
" initial_hosts"必须有一个条目,然后用户可以输入"时间"或者" Num"但不是两者(错误信息)。
如果在"时间"中输入值当"计算"单击我希望它调用函数编号()和如果" Num"调用函数timeCal()
<script language="javascript" type="text/javascript">
function timeCal(){
a=Number(document.calculator.initial_hosts.value);
b=Number(document.calculator.Num.value);
// Example of cal
c=a*b;
document.calculator.total.value=c;
}
</script>
<script language="javascript" type="text/javascript">
function number(){
a=Number(document.calculator.initial_hosts.value);
b=Number(document.calculator.Time.value);
// Example of cal
c=a*b;
document.calculator.total.value=c;
}
</script>
<div class="figure2">
<form name ="calculator" class="form">
<p>You can use the calculator below to see the approximate number of infected hosts after a given amount of time </p>
<label for="Fname">initial hosts:</label><br/>
<input type="text" name="initial_hosts"/><br/>
<label for="Fname">Trigger Date:</label><br/>
<input type="text" id="TTime" value="" />
<br/><br/>
<font face="arial, helvetica" size="2" >Note: Enter the time space or the number of targets </font><br/>
<label for="Time">Enter Time:</label><br/>
<input type="text" name="Time"/><br/>
<label for="Num">Target Number :</label><br/>
<input type="text" name="Num"/><br/>
<label for="total">Outcome:</label><br/>
<input type="text" name="total"/><br />
<br/>
<p><input type="button" style="height: 35px; width: 100px" value="Calculate" onclick="javascript:timeCal();"/>
</form>
</div>
我不知道我怎么能这样做,谢谢你提前:)
答案 0 :(得分:1)
<script language="javascript" type="text/javascript">
function callAppropriateFunction(){
numValue=document.calculator.Num.value;
timeValue=document.calculator.Time.value;
if(numValue!='')
number();
else if(timeValue!='')
timeCal();
else
alert("please select either number or time");
}
</script>
<input type="button" style="height: 35px; width: 100px" value="Calculate" onclick="javascript:callAppropriateFunction();"/>
答案 1 :(得分:0)
创建一个名为calculate();
的新函数,然后从那里检查哪个字段中包含数据。
function calculate() {
if (document.calculator.time.value != ""){
timeCal();
}else {
number();
}
}
并更改按钮以运行calculate();
<input type="button" style="height: 35px; width: 100px" value="Calculate" onclick="javascript:calculate();"/>