jQuery前台数据获取实现代码

/// <reference path="jUtil.js" /> 

$j = jQuery.noConflict(); 
(function ($j) { 
$j.providerData={ 
defaultSettings: { 
select_Span_Items: false, 
select_TD_Items: false, 
select_LI_Items: false 
}, 
init:function(options){ 
opts = $j.extend({}, $j.providerData.defaultSettings, options); 
singleItemJsonFormat='"{0}":"{1}"'; 
divItemFormat='{{0}}'; 
tableItemFormat='{0}'; 

}, 
getDataName:function(item){ 
var dataName = item.attr("dataname"); 
if(typeof dataName === 'undefined'||dataName==""){ 
dataName = item.attr("Id"); 
} 
if(typeof dataName === 'undefined'||dataName==""){ 
dataName=item.text(); 
} 
if(typeof dataName === 'undefined'||dataName==""){ 
dataName=item[0].innerText; 
} 
return dataName; 
}, 
getData:function(selector){ 
//var selector=opts.selector; 
var items; 
if(typeof selector!=="object"){ 
items=$j(selector); 
} 
else{ 
items=selector; 
} 

var retJsonValue=""; 
var subSelector=":input"; 

if (opts.select_Span_Items) { 
subSelector = subSelector + ",span"; 
} 
if (opts.select_LI_Items) { 
subSelector = subSelector + ",li"; 
} 
if(opts.select_TD_Items){ 
subSelector = subSelector + ",td"; 
} 

$j.each(items,function(i,item){ 
var t=$j(this); 
var dataName=$j.providerData.getDataName(t); 

//return:'{"dataname":"value"}' 
if($j.util.isInput(t)){ 
var value=t.val(); 
var itemStr= String.format(singleItemJsonFormat,dataName,value); 
retJsonValue=retJsonValue+itemStr+","; 
retJsonValue=retJsonValue.trimEnd(","); 
} 

//return:'{"dataname1":"value1","dataname2":"value2"}' 
else if($j.util.isDiv(t)){ 
var subItems = t.find(subSelector); 
var subStr = ""; 
$j.each(subItems, function (i, subItem) { 
//递归调用 处理子元素 
var tempSubItemStr = $j.providerData.getData("#"+$j(this).attr("id")); 
subStr = subStr + "," + tempSubItemStr; 
}) 
subStr=subStr.trimStart(","); 
retJsonValue=String.format(divItemFormat,subStr); 
} 

//return:'[{"dataname1":"value1","dataname2":"value2"},{"dataname1":"value3","dataname2":"value4"}]' 
else if($j.util.isTable(t)){ 
var trItems=t.find("TR:gt(0)"); 
//迭代处理Table中的每一行 
$j.each(trItems,function(i,trItem){ 
//处理行，找出行中的要收集数据的元素 
var subItems =$j(this).find(subSelector); 
var subStr = ""; 
//迭代处理行中所有需要收集数据的元素 
$j.each(subItems,function(i,subItem){ 
if($j.util.isInput($j(this))){ 
var tempSubItemStr = $j.providerData.getData("#"+$j(this).attr("id")); 
subStr = subStr + "," + tempSubItemStr; 
} 
else{ 
//如果是TD元素，且他里面不包含INPUT元素 
if( $j.util.isTD($j(this)) && ($j(this).find(":input").length==0)){ 
var tempSubItemStr = $j.providerData.getData($j(this)); 
subStr = subStr + "," + tempSubItemStr; 
} 
} 
}); 
subStr=subStr.trimStart(","); 
retJsonValue= retJsonValue+String.format(divItemFormat,subStr)+","; 
}); 
retJsonValue=retJsonValue.trimEnd(","); 
retJsonValue="["+retJsonValue+"]"; 
} 

//return:'{"dataname":"value"}' 
else if($j.util.isLi(t)){ 
var value=t.text(); 
var itemStr= String.format(singleItemJsonFormat,dataName,value); 
retJsonValue=retJsonValue+itemStr+","; 
retJsonValue=retJsonValue.trimEnd(","); 
} 

//return:'{"dataname":"value"}' 
else if($j.util.isTD(t)){ 

var value=t.text(); 
// var rowIndex = t.parent().prevAll().length; 
//获取当前列的列索引 
var colIndex = t.prevAll().length; 
//dataName由列的的列头中dataName属性决定，如果找不到由列头的内容决定 
var thItem=t.parent().parent().parent().find("th:eq("+colIndex+")"); 
if(thItem.length==1){ 
dataName=$j.providerData.getDataName(thItem); 
} 
var itemStr= String.format(singleItemJsonFormat,dataName,value); 
retJsonValue=retJsonValue+itemStr+","; 
retJsonValue=retJsonValue.trimEnd(","); 
} 
}); 

return retJsonValue; 
} 

}; 

jProviderData=function(options){ 
$j.providerData.init(options); 
return $j.providerData.getData(options.selector); 
}; 

})(jQuery);

String.prototype.trimStart = function(trimStr){ 
if(!trimStr){return this;} 
var temp = this; 
while(true){ 
if(temp.substr(0,trimStr.length)!=trimStr){ 
break; 
} 
temp = temp.substr(trimStr.length); 
} 
return temp; 
}; 
String.prototype.trimEnd = function(trimStr){ 
if(!trimStr){return this;} 
var temp = this; 
while(true){ 
if(temp.substr(temp.length-trimStr.length,trimStr.length)!=trimStr){ 
break; 
} 
temp = temp.substr(0,temp.length-trimStr.length); 
} 
return temp; 
}; 
String.prototype.trim = function(trimStr){ 
var temp = trimStr; 
if(!trimStr){temp=" ";} 
return this.trimStart(temp).trimEnd(temp); 
}; 
String.format = function () { 
if (arguments.length == 0) { 
return null; 
} 
var str = arguments[0]; 
for (var i = 1; i < arguments.length; i++) { 
var re = new RegExp('\\{' + (i - 1) + '\\}', 'gm'); 
str = str.replace(re, arguments[i]); 
} 
return str; 
} 
(function ($j) { 
$j.util = { 
_compareTagName : function (item, tagName) { 
return item.attr("tagName").toUpperCase() == tagName.toUpperCase(); 
}, 

isTable: function (item) { 
return $j.util._compareTagName(item, "TABLE"); 
}, 
isDiv: function (item) { 
return $j.util._compareTagName(item, "DIV"); 
}, 

isInput: function (item) { 
return $j.util._compareTagName(item, "INPUT"); 
}, 
isSpan: function (item) { 
return $j.util._compareTagName(item, "SPAN"); 
}, 
isLi: function (item) { 
return $j.util._compareTagName(item, "LI"); 
}, 
isTD: function (item) { 
return $j.util._compareTagName(item, "TD"); 
} 
}; 
})(jQuery);