判断输入是否填全

- 中国WEB开发者网络 (http://www.webasp.net)
-- 网页特效 (http://www.webasp.net/javascript/)
--- 判断输入是否填全 (http://www.webasp.net/javascript/1/525.htm)
-- 发布日期： 2005-06-16
<!-- 网页特效代码由[中国WEB开发者网络:http://www.ChinaWebDev.com]提供！ -->
<!-- 要实现此效果需要 1 个步骤： -->

<!-- 第 1 步： -->
<!-- 把下面的代码加到<BODY></BODY>区域中： -->

<script language="JavaScript">
<!--
function formCheck(formobj){
// Enter name of mandatory fields
var fieldRequired = Array("FirstName", "LastName");
// Enter field description to appear in the dialog box
var fieldDescription = Array("第一输入框", "第二输入框");
// dialog message
var alertMsg = "请把各个输入框都填全\n";

var l_Msg = alertMsg.length;

for (var i = 0; i < fieldRequired.length; i++){
var obj = formobj.elements[fieldRequired[i]];
if (obj){
switch(obj.type){
case "select-one":
if (obj.selectedIndex == -1 || obj.options[obj.selectedIndex].text == ""){
alertMsg += " - " + fieldDescription[i] + "\n";
}
break;
case "select-multiple":
if (obj.selectedIndex == -1){
alertMsg += " - " + fieldDescription[i] + "\n";
}
break;
case "text":
case "textarea":
if (obj.value == "" || obj.value == null){
alertMsg += " - " + fieldDescription[i] + "\n";
}
break;
default:
}
if (obj.type == undefined){
var blnchecked = false;
for (var j = 0; j < obj.length; j++){
if (obj[j].checked){
blnchecked = true;
}
}
if (!blnchecked){
alertMsg += " - " + fieldDescription[i] + "\n";
}
}
}
}

if (alertMsg.length == l_Msg){
return true;
}else{
alert(alertMsg);
return false;
}
}
// -->
</script>
<form name="formcheck" onsubmit="return formCheck(this);">
第一输入框: <input type=text name="FirstName" size="25"><br>
第二输入框: <input type=text name="LastName" size="25"><br>
<input type=submit value="提交">

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