Question

可能重复：
javascript drop down loop if statement

我创建了2个下拉菜单，包括从8开始的时间，包括从8开始的时间。 22:00，但是在提交表格时，它要求我选择一个已经被选中并通过我已经包含的提醒选项确认的开始时间，真的很困惑我！任何帮助表示感谢。

克雷格

window.status='Loading contingency scripts - please wait...';
audit('Loading contingency scripts');
var conting={ i:0

,start:function(){
window.status='Loading form - please wait...';
var t='';
t+='<form name="frm_conting" id="frm_conting" onsubmit="return false;">';
t+='<table width="100%" cellspacing="1" cellpadding="0">';
t+='<tr><td>Date (DD/MM/YY):</td><td><input type="text" size="8" value="'+current_date+'" id="date"></td></tr>';

t+='<tr><td>Time Started:</td><td><select id="timefrom"><option></option>';
  for(h=8;h<23;h++){  
      for(m=0;m<46;m=m+15){  t+='<option value='+nb[h]+':'+nb[m]+'>'+nb[h]+':'+nb[m]+'</option>';  };
     };
t+='</select></td></tr>';

t+='<tr><td>Time Finished:</td><td><select id="timefrom"><option></option>';
  for(h=8;h<23;h++){  
  for(m=0;m<46;m=m+15){  t+='<option value='+nb[h]+':'+nb[m]+'>'+nb[h]+':'+nb[m]+'</option>';  };
     };

t+='</select><tr><td>Extension #:</td><td><input type="text" size="5" value="'+my.extension+'" id="staffid"></td></tr>';
t+='<tr><td>Desk ID:</td><td><input type="text" size="5" value='+my.deskid+' id="desk"></td></tr>';
t+='<tr><td>Number of calls:</td><td><input type="text" size="5" id="calls"></td></tr>';
t+='<tr><td>Avid ID:</td><td><input type="text" size="5" id="avid"></td></tr>';
t+='<tr><td><input type="button" value="Submit" onClick="conting.save()"></td>'; 
t+='</table>';
t+='</form>';

div_form.innerHTML=t;  
window.resizeTo(400,385);
window.status='';
}


,save:function(){
 alert (frm_conting.timefrom.value);
  var conting_date=frm_conting.date.value; 
   if(!isdate(conting_date)){alert("You have entered an incorrect date.");return false;};

var conting_timefrom=frm_conting.timefrom.value;  
 if(isNaN(conting_timefrom)){alert("You need to enter a starting time.");return false;}; 
 if(conting_timefrom.value>conting_timeto.value){alert("The time you have entered is after the finish time.");return false;}; 

var conting_timeto=frm_conting.timeto.value; 
 if(isNaN(conting_timeto)){alert("You need to enter a finishing time.");return false;}; 
 if(conting_timeto.value<conting_timefrom.value){alert("The time you have entered is after the finish time.");return false;}; 

var conting_staffid=frm_conting.staffid.value; 
 if(conting_staffid.length!=5) { alert("You have entered an incorrect extension number.");return false;};

var conting_desk=frm_conting.desk.value; 
 if(conting_desk.length!=5) { alert("You have entered an incorrect desk ID.");return false;}; 

var conting_calls=frm_conting.calls.value; 
 if(isNaN(conting_calls)){alert("You have not entered amount of calls.");return false;};

var conting_avid=frm_conting.avid.value; 
 if(isNaN(conting_avid)){alert("You have entered an incorrect avid ID.");return false;};
 if(conting_avid.length!=5) { alert("You have entered an incorrect avid ID.");return false;}; 

 conn.open(db["contingency"]);
 rs.open("SELECT MAX(prac_id) FROM practice",conn);
var prac_id=rs.fields(0).value+1;
 rs.close();
 rs.open("INSERT INTO practice (prac_id, prac_staffid, prac_date, prac_timefrom, prac_timeto, prac_extension, prac_desk, prac_calls, prac_avid) VALUES (1, 2, 3, 4, 5, 6, 7, 8, 9)",conn); 
 conn.close();



}


};
 window.status='';

enter code here

Answer 1

t+='<option value='+nb[h]+':'+nb[m]+'>'+nb[h]+':'+nb[m]+'</option>'

只要值不是数字（isNaN），js save例程就会失败。该值中有一个冒号，因此它永远不是一个数字。您不需要检查isNaN，因为它是一个下拉菜单，因此您可以控制输入的内容，这与您可能使用isNaN以确保用户输入数字的文本框不同。

javascript下拉循环if语句

1 个答案: