表单验证

1. js验证radio是否选择

<script language="javascript">
  function checkform(obj) {
    for(i=0;i<obj.oo.length;i++) 
      if(obj.oo[i].checked==true) 
        return true;
      alert("请选择")return false; 
  }
</script>

<form id="form1" name="form1" method="post" action="" onsubmit="return checkform(this)">   
  <input type="radio" name="oo" value="radiobutton" />
  <input type="radio" name="oo" value="radiobutton" />
  <input type="submit" name="Submit" value="提交" />
</form>

2. 长度限制
<script>
  function test() {
    if(document.a.b.value.length>50){
      alert("不能超过50个字！");
      document.a.b.focus();
      return false;
    }
  }
</script>
<form name=a onsubmit="return test()">
  <textarea name="b" cols="40" wrap="VIRTUAL" rows="6"></textarea>
  <input type="submit" name="Submit" value="check">
</form> 

3. 只能是汉字 
<input onkeyup="value="/oblog/value.replace(/[^\u4E00-\u9FA5]/g,'')">

4." 只能是英文
<script language=javascript>
  function onlyEng(){
    if(!(event.keyCode>=65&&event.keyCode<=90))      event.returnvalue=false;
  }
</script>
<input onkeydown="onlyEng();">

5. 只能是数字
<script language=javascript>
  function onlyNum(){
    if(!((event.keyCode>=48&&event.keyCode<=57)(event.keyCode>=96&&event.keyCode<=105)))//考虑小键盘上数字键
      event.returnvalue=false;
  }
</script>
<input onkeydown="onlyNum();">

6. 只能是英文字符和数字
<input onkeyup="value="/oblog/value.replace(/[\W]/g,"'') "
       onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">

7. 验证油箱格式
<SCRIPT LANGUAGE=javascript RUNAT=Server>
  function isEmail(strEmail) {
    if (strEmail.search(/^\w+((-\w+)(\.\w+))*\@[A-Za-z0-9]+((\. -)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)          return true;elsealert("oh");
  }
</SCRIPT>
<input type=text onblur=isEmail(this.value)>

8. 屏蔽关键字(这里屏蔽***和****)
<script language="javascript1.2">
  function test() {
    if((a.b.value.indexOf ("***") == 0) (a.b.value.indexOf ("****") == 0)){
      alert("");
      a.b.focus();
      return false;
    }
  }
</script>
<form name=a onsubmit="return test()">
  <input type=text name=b><input type="submit" name="Submit" value="check">
</form>

9. 两次输入密码是否相同
<FORM METHOD=POST ACTION="">
   <input type="password" id="input1">
   <input type="password" id="input2">
   <input type="button" value="test" onclick="check()">
</FORM>
<script>
  function check(){ 
    with(document.all){
        if(input1.value!=input2.value){
            alert("false")
            input1.value = "";
            input2.value = "";
        }
        else 
           document.forms[0].submit();
     }
 }
</script>

10. 表单项不能为空
<script language="javascript">
<!--function CheckForm(){ 
  if (document.form.name.value.length == 0) { 
    alert("请输入您姓名!");
    document.form.name.focus();
    return false;
  }
  return true;
}-->
</script>

11. checkbox控制全选
//全选
function checkboxAll(checkObj) {
  	var checkChoose = $(checkObj);
  	var all = checkChoose.attr("checked");
	   	if (all) {
			var ch = $.find("input[type=checkbox]");
			$.each(ch,function(){
					$(this).attr("checked",true);
			});
	   	}
	   	else {
	   		var ch = $.find("input[type=checkbox]");
			$.each(ch,function(){
				$(this).attr("checked",false);
			});
	   	}
  }



<script type="text/javascript">
	
  $(document).ready(function(){
	  isChooseAll();
	  $("#qxz").click(function(){
		  //选择所有checkbox对象
		  checkboxAll(this);
	  });
	  
	  //双击事件操作
	  $('tr').dblclick(function(){
		  var checkbox = $(this).find('input[type="checkbox"]');
		  if (!$(checkbox).attr("checked")) {
			  $(checkbox).attr("checked",true);
		  }
		  else {
			  $(checkbox).attr("checked",false);
		  }
		  isChooseAll();
	  });
	  
	  //单击事件全选操作
	  $("input[name=opers]").click(function(){
		  var checkbox = $(this).find('input[type="checkbox"]');
		  if (!$(checkbox).attr("checked")) {
			  $(checkbox).attr("checked",true);
		  }
		  else {
			  $(checkbox).attr("checked",false);
		  }
		  isChooseAll();
	  });
  });
  
  //对全选判断
  function isChooseAll() {
	  var allChecked = $(document).find('input[name=opers]');
	  var chooseAll = true;
	  var j = 0;
	  for (var i = 0 ; i < allChecked.length; i++) {
		  
		  var v_choose = $(allChecked[i]).attr("checked");
		  if (v_choose == "checked") {
			  chooseAll = true;
			  j++;
		  }
		  else {
			  chooseAll = false;
			  break;
		  }
	  }
	  if (j == allChecked.length) {
		  chooseAll = true;
	  }
	  if (chooseAll) {
		  $('#qxz').attr("checked",true);
	  }
	  else {
		  $('#qxz').attr("checked",false);
	  }
  }
  
</script>


<script type="text/javascript">
$(document).ready(function(){
	  $("#hdsz").click(function(){
		  var checkbox1 = $(document).find('input[type="checkbox"]');
		  if ($(checkbox1).attr("checked")) {
			  $(checkbox1).attr("checked",false);
			  $('#szltx').attr("checked",false);
			  $('#hdsz').attr("checked",true);
		  }
	  });
	  $("#szltx").click(function(){
		  var checkbox2 = $(document).find('input[type="checkbox"]');
		  if ($(checkbox2).attr("checked")) {
			  $(checkbox2).attr("checked",false);
			  $('#szltx').attr("checked",true);
		  }
	  });
	  $("#yplclbc").click(function(){
		  var checkbox3 = $(document).find('input[type="checkbox"]');
		  if ($(checkbox3).attr("checked")) {
			  $(checkbox3).attr("checked",false);
			  $('#yplclbc').attr("checked",true);
		  }
	  });
	  $("#czbz_qt").click(function(){
		  var checkbox4 = $(document).find('input[type="checkbox"]');
		  if ($(checkbox4).attr("checked")) {
			  $(checkbox4).attr("checked",false);
			  $('#czbz_qt').attr("checked",true);
		  }
	  });
  });
</script>