本地数据jqGrid分页

var mydata='';
$(function() {
var str = '';
str += "<span>共<span id='p_total'></span>条记录</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"
str += "<span>每页" + "<select id='set_page_size' class='ui-button ui-widget ui-state-default ui-corner-all'>"
str += "<option value='5'>5</option>" + "<option value='10'>10</option>" + "<option value='15'>15</option>"
str += "<option value='20' selected='selected'>20</option>" + "<option value='25'>25</option>" + "<option value='30'>30</option>"
str += "</select>" + "条&nbsp;&nbsp;</span>";
str += "<span style='width:230px;height:20px;'>";
str += "<span id='p_first'>&nbsp;&nbsp;</span>";
str += "<span id='p_before'>&nbsp;&nbsp;</span>";
str += "<span class='p_count'>当前<span id='p_current'>1</span>&nbsp;/&nbsp;<span id='p_total_page'></span>页</span>"
str += "<span id='p_next'>&nbsp;&nbsp;</span>";
str += "<span id='p_last'>&nbsp;&nbsp;</span>";
str += "</span>";
str += "<span style='margin-left:10px;'>跳转到:</span>"
str += "<input type='text' id='p_pager'/>&nbsp;页"
$("#pager").append(str);
mydata = [{
id: "1",
invdate: "2007-10-01",
name: "test",
note: "note",
amount: "200.00",
tax: "10.00",
total: "210.00"
}, {
id: "2",
invdate: "2007-10-02",
name: "test2",
note: "note2",
amount: "300.00",
tax: "20.00",
total: "320.00"
}, {
id: "3",
invdate: "2007-09-01",
name: "test3",
note: "note3",
amount: "400.00",
tax: "30.00",
total: "430.00"
}, {
id: "4",
invdate: "2007-10-04",
name: "test",
note: "note",
amount: "200.00",
tax: "10.00",
total: "210.00"
}, {
id: "5",
invdate: "2007-10-05",
name: "test2",
note: "note2",
amount: "300.00",
tax: "20.00",
total: "320.00"
}, {
id: "6",
invdate: "2007-09-06",
name: "test3",
note: "note3",
amount: "400.00",
tax: "30.00",
total: "430.00"
}, {
id: "7",
invdate: "2007-10-04",
name: "test",
note: "note",
amount: "200.00",
tax: "10.00",
total: "210.00"
}, {
id: "8",
invdate: "2007-10-03",
name: "test2",
note: "note2",
amount: "300.00",
tax: "20.00",
total: "320.00"
}, {
id: "9",
invdate: "2007-09-01",
name: "test3",
note: "note3",
amount: "400.00",
tax: "30.00",
total: "430.00"
}, {
id: "10",
invdate: "2007-10-01",
name: "test",
note: "note",
amount: "200.00",
tax: "10.00",
total: "210.00"
}, {
id: "11",
invdate: "2007-10-02",
name: "test2",
note: "note2",
amount: "300.00",
tax: "20.00",
total: "320.00"
}, {
id: "12",
invdate: "2007-10-02",
name: "test2",
note: "note2",
amount: "300.00",
tax: "20.00",
total: "320.00"
}, {
id: "13",
invdate: "2007-09-01",
name: "test3",
note: "note3",
amount: "400.00",
tax: "30.00",
total: "430.00"
}, {
id: "14",
invdate: "2007-10-04",
name: "test",
note: "note",
amount: "200.00",
tax: "10.00",
total: "210.00"
}, {
id: "15",
invdate: "2007-10-05",
name: "test2",
note: "note2",
amount: "300.00",
tax: "20.00",
total: "320.00"
}, {
id: "16",
invdate: "2007-09-06",
name: "test3",
note: "note3",
amount: "400.00",
tax: "30.00",
total: "430.00"
}, {
id: "17",
invdate: "2007-10-04",
name: "test",
note: "note",
amount: "200.00",
tax: "10.00",
total: "210.00"
}, {
id: "18",
invdate: "2007-10-03",
name: "test2",
note: "note2",
amount: "300.00",
tax: "20.00",
total: "320.00"
}, {
id: "19",
invdate: "2007-09-01",
name: "test3",
note: "note3",
amount: "400.00",
tax: "30.00",
total: "430.00"
}, {
id: "20",
invdate: "2007-09-01",
name: "test3",
note: "note3",
amount: "400.00",
tax: "30.00",
total: "430.00"
}, {
id: "21",
invdate: "2007-09-01",
name: "test3",
note: "note3",
amount: "400.00",
tax: "30.00",
total: "430.00"
}
];
jQuery("#grid1").jqGrid({
datatype: "local",
width: pageWidth() - 18,
height: 450,
colNames: ['Inv No', 'Date', 'Client', 'Amount', 'Tax', 'Total', 'Notes'],
colModel: [{
name: 'id',
index: 'id',
width: 60,
sorttype: "int"
}, {
name: 'invdate',
index: 'invdate',
width: 90,
sorttype: "date"
}, {
name: 'name',
index: 'name',
width: 100
}, {
name: 'amount',
index: 'amount',
width: 80,
align: "right",
sorttype: "float"
}, {
name: 'tax',
index: 'tax',
width: 80,
align: "right",
sorttype: "float"
}, {
name: 'total',
index: 'total',
width: 80,
align: "right",
sorttype: "float"
}, {
name: 'note',
index: 'note',
width: 150,
sortable: false
}
],
rownumbers: true,
multiselect: false,
caption: "Manipulating Array Data"
});
// 数据初始化
var total = mydata.length;//记录总数
$("#p_total").html(total);
var p_total_page='';//页数总数
var p_num = $("#set_page_size option:selected").val();//当前页显示数据
if(total % p_num == 0){
p_total_page = parseInt(total / p_num);
}else{
p_total_page = parseInt(total / p_num)+1;
}
$("#p_total_page").html(p_total_page);
for (var i = 0; i < p_num; i++) {
jQuery("#grid1").jqGrid('addRowData', i + 1, mydata[i]);
}
// 总页数/每页显示多少条记录
$("#set_page_size").change(function() {
$("#grid1").clearGridData();
p_num = $("#set_page_size option:selected").val();
if(total % p_num == 0){
p_total_page = parseInt(total / p_num);
}else{
p_total_page = parseInt(total / p_num)+1;
}
$("#p_total_page").html(p_total_page);
$("#p_current").html(1);//当前页码
for (var i = 0; i < p_num; i++) {
jQuery("#grid1").jqGrid('addRowData', i + 1, mydata[i]);
}
});
// 第一页
$("#p_first").click(function() {
$("#p_current").html("1");
var p_num = $("#set_page_size option:selected").html();
$("#grid1").clearGridData();
for(var i=0;i<p_num;i++){
jQuery("#grid1").jqGrid('addRowData', i + 1, mydata[i]);
}
});
// 前一页
$("#p_before").click(function() {
var num = $("#p_current").html();
var a = new Array();
if (num > 1) {
$("#p_current").html(num - 1);
var p = $("#p_current").html()-1;
var p_num = $("#set_page_size option:selected").html();
var sum = p*p_num;
$("#grid1").clearGridData();
for (var i = sum; i < mydata.length; i++) {
a.push(mydata[i]);
}
for(var i=0;i<p_num;i++){
jQuery("#grid1").jqGrid('addRowData', i + 1, a[i]);
}
};
});
// 下一页
$("#p_next").click(function() {
var num = $("#p_current").html();
var total = $("#p_total_page").html();
var a = new Array();
if (num < total) {
$("#p_current").html(parseInt(num) + 1);
var p = $("#p_current").html()-1;
var p_num = $("#set_page_size option:selected").html();
var sum = p*p_num;
$("#grid1").clearGridData();
for (var i = sum; i < mydata.length; i++) {
a.push(mydata[i]);
}
for(var i=0;i<p_num;i++){
jQuery("#grid1").jqGrid('addRowData', i + 1, a[i]);
}
};
});
//最后一页
$("#p_last").click(function() {
$("#p_current").html(p_total_page);
var p = $("#p_current").html()-1;
var p_num = $("#set_page_size option:selected").html(); 
var sum = p*p_num;
var a = new Array();
$("#grid1").clearGridData();
for (var i = sum; i < mydata.length; i++) {
a.push(mydata[i]);
}
for(var i=0;i<p_num;i++){
jQuery("#grid1").jqGrid('addRowData', i + 1, a[i]);
}
});
// 跳转到几页
$("#p_pager").keydown(function(e) {
if (e.keyCode == 13) {
var pager = $("#p_pager").val();
if (pager <= p_total_page) {
$("#p_current").html(pager);
var p = pager-1;
var p_num = $("#set_page_size option:selected").html(); 
var sum = p*p_num;
var a = new Array();
$("#grid1").clearGridData();
for (var i = sum; i < mydata.length; i++) {
a.push(mydata[i]);
}
for(var i=0;i<p_num;i++){
jQuery("#grid1").jqGrid('addRowData', i + 1, a[i]);
}
} else {
alert("请正确输入要跳转的页码!");
}
}
})
});
function pageWidth() {
if ($.browser.msie) {
return document.compatMode == "CSS1Compat" ? document.documentElement.clientWidth : document.body.clientWidth;
} else {
return self.innerWidth;
}

};