不知道，大家有没有遇到这样的奇葩问题，当时今天笔者很不幸，遇到这一奇葩的问题，就当使用window.showModalDialog("test.jsp",args,‘dialogHeight=100px;dialogWidth=250px;‘);进行数据传输，当args的数据大于4096个字符时，多出来的数据会被自动截掉，从而导致数据的完整性丢失.
Syntax
vReturnValue = window.showModalDialog(sURL [, vArguments] [, sFeatures])
Parameters
| sURL | Required. String that specifies the URL of the document to load and display. |
| vArguments |
Optional. Variant that specifies the arguments to use when displaying the document. Use this parameter to pass a value of any type, including an array of values. The dialog box can extract the values passed by the caller from the dialogArguments property of the window object. |
MSDN给出了如下标识：
The vArguments parameter can be referenced within
the modal dialog box using the dialogArguments property of the window object.
If the vArguments parameter is defined as a string, the maximum string length that can be passed to the modal dialog
box is 4096 characters; longer strings are truncated.
根据MSDN的说法，我们把args弄成object或array就行了,那么对于参数传出和传入的地方都需要修改"接口"的代码，这样一来未免就一些许麻烦。那么能不能让字符串参数突破args的4096个字符的限制呢？
其实对于一个字符串来说，只要我们把它包装成string
object，就可以不再args长度的限制了，而且在Modal Dialog中处理字符串的接口函数不需要做任何的修改，如下代码：
function test(id){
var _bpc;
jQuery.ajax({
url: 'test.html',
data: {'id': id, 'name': name},
type : "POST",
async: false,
cache : false,
dataType : "json",
success : function(data) {
var result = json_parse(unescape(data));
var selectHTML = [];
if(result){
if(result.length == 1){
_bpc = {'id': result[0][0], 'name': result[0][1]};
} else if(result.length > 1){
selectHTML .push('<select name="">');
for(var i = 0, le = result.length; i < le; i++){
var item = result[i];
selectHTML.push('<option id="bpc' + item[0] + '" value="' + item[0] + '">' + item[1] + '</option>');
}
selectHTML.push('</select>');
alert(selectHTML.length);
_obj = window.showModalDialog('index.html?'+'Math.random().toString()',selectHTML, 'dialogHeight=100px;dialogWidth=250px;');
if(!_obj) _obj = {'id': -1, 'name': ''};
}
}
},
error: function(e){
alert('查询失败，请稍后再试！');
}
});
return _obj;
}
数据接收页面：
<script type="text/javascript" language="javascript">
function finish(){
var sel = document.getElementById('selDiv').firstChild;
if(sel){
var selectedItem = sel.options[sel.selectedIndex];
window.returnValue = {'id': selectedItem.value, 'name': selectedItem.text};
}
window.close();
}
window.onload =function(){
var args = window.dialogArguments;
if(args != null){
var bpcsArgs = args.join('');
document.getElementById("selDiv").innerHTML = bpcsArgs;
document.getElementById("selDiv").firstChild.focus();
}
}
</script>
</head>
<body style="text-align: center;background: #ECE9D8; margin: 5px auto;" onkeydown="if(event.keyCode==13)finish()">
<table align="center">
<tr align="left"><td>该档案存在于以下流水类型中</td></tr>
<tr align="left"><td>请选择一个后点击确定</td></tr>
<tr align="center"><td><div id="selDiv"></div></td></tr>
<tr align="center"><td><input type="submit" value="确定" onclick="finish()" />
<input type="button" value="取消" onclick="window.close()" /></td></tr>
</table>
</body>
</html>