提交数据前不用点击提交按钮,表单位中input自动检测有没有输入数据,如何实现

解决方案 »

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<script language="JavaScript">
  function checkform()
  {
   var bb=form1.name.value;
  if(bb="")
  { alert("iput your name")
  }
  </script>
<input type="text" id="name" name="name" onblur="checkform()"> 错在何处???????????
<script language="javascript">
function check(aa)
{
if(aa=="")
{
alert("请输入数据！");
return false;
}
return true;
}
</script>
<form id="form1" name="form1" method="post" action="">
  <input type="text" name="aa" id="aa" onblur="return check(this.value)" />
</form>
<script language="JavaScript">
  function checkform()
  {
  var bb=form1.name.value;
  if(bb="")
  { alert("iput your name")
  }
  </script>
<input type="text" id="name" name="name" onblur="checkform()"> 错在何处???????????提示说缺少对象!!!!!
<script language="JavaScript">
  function checkform()
  {
   var bb=form1.name.value;
  if(bb="")
  { alert("iput your name");}
  }
  </script>   <body>
<form id="form1" name="form1" method="post" action="1-1.asp">
  <label>name
  <input type="text" id="name" name="name" onblur="checkform()">
  </label>
  <p>
    <label>pass
    <input type="text" name="pass" />
    </label>
  </p>
  <p>
    <label>
    <input type="submit" name="Submit" value="提交" />
    </label>
  </p>
</form>
var bb=form1.name.value;
  if(bb="")
  { alert("iput your name");return false;}
    return true;
  }
<script language="javascript">
function check(aa)
{
if(aa=="")
{
alert("请输入数据！");
return false;
}
return true;
}
</script>
<form id="form1" name="form1" method="post" action="">
  <input type="text" name="aa" id="aa" onblur="return check(this.value)" />
</form>
还是用<script language="javascript">
function check(aa)
{
if(aa=="")
{
alert("请输入数据！");
return false;
}
return true;
}
</script>
<form id="form1" name="form1" method="post" action="">
  <input type="text" name="aa" id="aa" onblur="return check(this.value)" />
</form>
if bb="" 修改为 if bb==""