如何用正则验证表单中不同名称文本框是否为数字？

解决方案 »

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<form  method="post" onsubmit="return check();">
  <p><input type="text" name="T1" size="20"></p>
  <p><input type="text" name="T2" size="20"></p>
  <p><input type="text" name="T3" size="20"></p>
  <p><input type="submit" value="提交" name="B1"></p>
</form>
<script language=JavaScript>
function check(){
var t1 = document.forms[0].t1;
if (checkDigitalChar(t1,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t1.select();
return false;
}
var t2 = document.forms[0].t2;
if (checkDigitalChar(t2,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t2.select();
return false;
}
var t3 = document.forms[0].t3;
if (checkDigitalChar(t3,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t3.select();
return false;
}
}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>无标题文档</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<script language=JavaScript>
function check(){
var t1 = document.forms[0].t1;
if (checkDigitalChar(t1,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t1.select();
return false;
}
var t2 = document.forms[0].t2;
if (checkDigitalChar(t2,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t2.select();
return false;
}
var t3 = document.forms[0].t3;
if (checkDigitalChar(t3,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t3.select();
return false;
}
function checkDigitalChar(cntrl,errmsg3,flag,errmsg1,errmsg2)
  {
    var str;
    str = cntrl.value;
   if (str.indexOf(" ") >=0)
   {

window.alert(errmsg3);
cntrl.focus();
cntrl.select();
return false;
}

if (flag == 1){
    if(str.length==0)
    {
       //alert("Input is blank, please re-input.");
       alert(errmsg1);
       return false;
    }
}
    for(var loop_index=0; loop_index<str.length; loop_index++)
    {
      if(str.charAt(loop_index) == '0'
         ||str.charAt(loop_index) == '1'
         ||str.charAt(loop_index) == '2'
         ||str.charAt(loop_index) == '3'
         ||str.charAt(loop_index) == '4'
         ||str.charAt(loop_index) == '5'
         ||str.charAt(loop_index) == '6'
         ||str.charAt(loop_index) == '7'
         ||str.charAt(loop_index) == '8'
         ||str.charAt(loop_index) == '9')
          continue;
      else
         {
           //alert("Valid characters are 0-9. Please re-input.");
           alert(errmsg2);
           return false;
   }
    }
    return true;
  }
}
</script>
</head><body><form  method="post" onsubmit="return check();">
  <p><input type="text" name="t1" size="20"></p>
  <p><input type="text" name="t2" size="20"></p>
  <p><input type="text" name="t3" size="20"></p>
  <p><input type="submit" value="提交" name="B1"></p>
</form></body>
</html>
完整代码如下：
提示错误：行5字符5，value为空或不是对象<script language=javascript>
function checkDigitalChar(cntrl,errmsg3,flag,errmsg1,errmsg2)
  {
    var str;
    str = cntrl.value;
   if (str.indexOf(" ") >=0)
   {

window.alert(errmsg3);
cntrl.focus();
cntrl.select();
return false;
}

if (flag == 1){
    if(str.length==0)
    {
       //alert("Input is blank, please re-input.");
       alert(errmsg1);
       return false;
    }
}
    for(var loop_index=0; loop_index<str.length; loop_index++)
    {
      if(str.charAt(loop_index) == '0'
         ||str.charAt(loop_index) == '1'
         ||str.charAt(loop_index) == '2'
         ||str.charAt(loop_index) == '3'
         ||str.charAt(loop_index) == '4'
         ||str.charAt(loop_index) == '5'
         ||str.charAt(loop_index) == '6'
         ||str.charAt(loop_index) == '7'
         ||str.charAt(loop_index) == '8'
         ||str.charAt(loop_index) == '9')
          continue;
      else
         {
           //alert("Valid characters are 0-9. Please re-input.");
           alert(errmsg2);
           return false;
   }
    }
    return true;
  }


function check(){
var t1 = document.forms[0].t1;
if (checkDigitalChar(t1,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t1.select();
return false;
}
var t2 = document.forms[0].t2;
if (checkDigitalChar(t2,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t2.select();
return false;
}
var t3 = document.forms[0].t3;
if (checkDigitalChar(t3,"输入数时不允许有空格。",0,"数不能为空","必须是数字") ==false) {
t3.select();
return false;
}
}
</script>
<form method="post" onsubmit="return check();">
  <p><input type="text" name="T1" size="20"></p>
  <p><input type="text" name="T2" size="20"></p>
  <p><input type="text" name="T3" size="20"></p>
  <p><input type="submit" value="提交" name="B1"></p>
</form>
还有一个小问题  http://community.csdn.net/Expert/topic/3725/3725214.xml?temp=7.563418E-02