Mobile Jquery(III)jquery mobile with json

Mobile Jquery(III)jquery mobile with json

1. Form validation
<form method="post" rel="external" action="index.php" onsubmit="return checkForm();">

<a rel="external" href="javascript:deleteEntry($id)">Delete this entry</a>

validate JS
function checkForm() {
try {
if ($.trim($('#person').val()) == "" ||
$.trim($('#contact').val()) == "" ||
$.trim($('#description').val()) == "") {
alert("Please enter all fields");
return false;
}
} catch (e) {
alert(e);
return false;
}
return true;
}

function deleteEntry(id) {
try {
var confirmString = "Delete this entry.  Are you sure?\n" + $.trim($('#person').val()) + "\n" + $.trim($('#contact').val()) + "\n" + $.trim($('#description').val());
if (window.confirm(confirmString)) {
window.location="index.php?action=delete&id=" + id;
}
} catch (e) {
alert(e);
return false;
}
return true;
}

2. JSON style
object  { string1 : value1 , string2 : value2}
array     [ value1, value2 ]

function showJSON() {  
    var user =  
     {  
        "username":"andy",  
        "age":20,  
        "info": { "tel": "123456", "cellphone": "98765"},  
        "address":  
             [  
                 {"city":"beijing","postcode":"222333"},  
                 {"city":"newyork","postcode":"555666"}  
             ]  
     }  
      
     alert(user.username);  
     alert(user.age);  
     alert(user.info.cellphone);  
     alert(user.address[0].city);  
     alert(user.address[0].postcode);  
      
     user.username = "Tom";  
     alert(user.username);  
}  

Object to String
function showCar() {  
    var carr = new Car("Dodge", "Coronet R/T", 1968, "yellow");  
    var carr_str = JSON.stringify(carr);
    alert(carr_str);
}
 
function Car(make, model, year, color)        {  
     this.make   =   make;  
     this.model   =   model;  
     this.year   =   year;  
     this.color   =   color;  
}  

String to Object
function myEval1() {  
    var str = '{ "name": "Violet", "occupation": "character" }';  
    var obj = eval('(' + str + ')');  
    alert(obj.name);  
}  

or

function myEval2() {  
    var str = '{ "name": "Violet", "occupation": "character" }';  
    var obj = JSON.parse(str);
    alert(obj.occupation);  
}


references:
http://www.ibm.com/developerworks/cn/xml/tutorials/x-jquerymobilejsontut/
http://www.json.org/json-zh.html
http://dev.firnow.com/course/3_program/java/javajs/20090830/172957.html
http://hi.baidu.com/%B4%F3%CE%B0/blog/item/49a0b545a618fd36cefca343.html