json , ajax

2024. 1. 15. 21:06ㆍDaily Codig Reminder

map

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
		//$.map(arr, func) 배열을 가공해서 변환, 대소문자 변환, 값의 일부분을 반환
var s = ["January","February","333333","44444", "555555", "666666"];
var arr = $.map(s, function(data, idx){
	console.log(data, idx);
	return data.substring(0,3); //각 배열방을 순회하며 문자열을 변경함
})
console.log(arr);
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>

</body>
</html>

merge

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
		//$.merge 두 배열의 병합
var s = ["a","b","c",1, 2];
var s1 = [1,2,3];
var arr=$.merge(s,s1)

console.log(arr);
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>

</body>
</html>

trim

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
		
var s = "       Hello         ";
console.log(s.length);
console.log($.trim(s).length);
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>

</body>
</html>

parseJSON 중요★★★★

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
		var jsonString = '{"name":"홍길동","age":20,"address":"서울"}';
		var jobj = {"name":"홍길동","age":20,"address":"서울"};
//		console.log(jsonString.name);
//		console.log(jsonString['name']);

		var jsonObj =$.parseJSON(jsonString);//문자열을 json으로 변경
		var name = jsonObj.name;
		var age = jsonObj.age;
		var address = jsonObj.address;
		console.log(name);
		console.log(age);
		console.log(address);
		$("#result").append(name+" "+age+" "+address+" ");
		$("#result").append("<h1>"+name+" "+age+" "+address+" "+"</h1>");
		////////////////
		var jsonObj2 =JSON.parse(jsonString); //얘를 주로 외워서 쓰기
		var name2 = jsonObj2.name;
		var age2 = jsonObj2.age;
		var address2 = jsonObj2.address;
		$("#result").append(name2+" "+age2+" "+address2+" ");
		$("#result").append("<h1>"+name2+" "+age2+" "+address2+" "+"</h1>");
		//////////////////////////
		var strObj = JSON.stringify(jsonObj); // json=> 문자열로 변환
		console.log(strObj);
		
    
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>
<div id="result"></div>
</body>
</html>

each

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>attribute(속성)</title>
<script type="text/javascript" src="../jquery-3.5.1.min.js"></script>
<script type="text/javascript">
//get함수는 fn객체가 아닌 javascipt객체를 가져와 javascript 명령을 사용해야 함 
//.css()사용안됨 
	$(function () {
		var lis= document.querySelectorAll("li");
		var result=0;
		for(var i=0; i<lis.length; i++){
			result += parseInt(lis[i].innerText);
		}
		$("#result").text(result);
	})
</script>
</head>
<body>
  <ul>
   <li>100</li>
   <li>200</li>
   <li>300</li>
   <li>400</li>
  </ul>
	<span id="result"></span>
</body>
</html>

<script type="text/javascript">
	$ (function(){
     console.log("get",$("li").get(0));
     console.log("get",$("li").eq(0));
     console.log($("li").get(0).innerText);
     console.log($('li').eq(0).text());
     
     var result =0;
     $.each($("li"), function(i, elt){
		 result= result+parseInt(elt.innerText);
	 })
	 console.log(result)
	 $("#result").text(result);
    });
		
	
</script>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>attribute(속성)</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
//get함수는 fn객체가 아닌 javascipt객체를 가져와 javascript 명령을 사용해야 함 
//.css()사용안됨 

	$(function () {
		
		$("button").click(function() {
			var result=0;
			$("li").each( function(i, elt) {
			//	var v= this.innerText;
				var v= $(this).text();
				result= result+ parseInt(v) ;
			});
			console.log(result);
			$("#result").text(result);
		}); //end click 
		
	});//end doc 
</script>
</head>
<body>
  <ul>
   <li>100</li>
   <li>200</li>
   <li>300</li>
   <li>400</li>
  </ul>
    <button>합계</button><br>
	<span id="result"></span>
</body>
</html>

event

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
$("#test").on("change",function(){

            $("#result").text($(this).val());

        })
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>
<select id="test">
    <option>a</option>
    <option>b</option>
</select>

<span id="result"></span>
</body>
</html>

글자출력

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
$("#a").on("click mouseover",function(){
console.log("ok button");
console.log("ok button",event.screenX, event.screenY);
$("#result").text(event.screenX);
});
  $("#b").on("click",function (){
$("#a").off("click mouseover");  

        })
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>
<button id="a">ok</button>
 <button id="b">ok2</button>
</body>
</html>

클릭시 마우스 오버 사라짐

$(function(){
		//이벤트
$("#a").one("click", function(){
	//이벤트를 한번만 실행 이벤트 실행후 자동으로 off ("click") 됨
	console.log("ok");
})
    });

$(function(){
		//이벤트
$("#a").on("click mouseover", function(){
	//이벤트를 한번만 실행 이벤트 실행후 자동으로 off ("click") 됨
	console.log(" a 버튼 ok");
})
$("#b").on("click",function(){
	console.log("trigger 버튼 클릭");
	$("#a").trigger("cilck");
})
    });

a버튼 클릭하거나 마우스 오버로 콘솔에 찍힘

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
$("#myForm1").on("submit",function(){
            alert("Hello");
            console.log("submit");
//          event.preventDefault();// 안넘어감 타겟으로
//            return false; // 얘 도 타겟으로 안넘어감
        })
$("#a").on("click",function(){
            alert("Hello");
            console.log("button");
//event.preventDefault();
//return false;
        }) // a 버튼만 안넘어가고 전송버튼만 가용됨.
$("#e").on("click",function(){
$("#myForm1").attr("action","target2.html");
console.log("submit");

        })        
 /*       
$("#b").on("click",function(){
	event.preventDefault();
 $("#myForm2").attr("action","target2.html"); //html에서 속성값을 가져옴
 console.log("submit");
})*/
$("#myForm2").on("submit",function(){
$("#myForm2").attr("action","target2.html");
  event.preventDefault(); // 안넘어가요~~~
          })
///////////////////////////////
$("#c").on("click",function(){
$("#myForm2").attr("action","target2.html").submit();
//주의 폼 바깥의 버튼.

          })
          $("#d").on("click",function(){
$("#myForm1").attr("action","target2.html");
$("#myForm1").submit();
//주의 폼 바깥의 버튼.

          })
        });
		
	
</script>
<title>Insert title here</title>
</head>
<body>
<form id="myForm1" action="target.html">
    <input type="text"  name="userid">
     <button id="a">a</button> <br>
     <button id="e">e</button> <br>
     <input type="submit" value="전송">
 </form>
 <hr>
<form id="myForm2" action="#">
    <input type="text"  name="userid">
    <button id="b">b</button>
 </form>
 
 
 <button id="c">c</button><br>
 <button id="d">d_form1</button>
</body>
</html>

버튼이동

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
$("#a").on("click",{foo:"test",age:"10"}, function(event){
	console.log(event.data.foo);
	console.log(event.data.age);
        })
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>
<button id="a">ok</button>

 <div></div>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
 $(function(){
$("#test").on("change",function(){
$("#result").text($(this).val());

        })
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>
<select id="test">
    <option>1</option>
    <option>2</option>
</select>
<span id="result"></span>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
 $(function(){
$("#a").on("click",function(){
console.log("ok ");
});
  $("#b").click(function (){
$("#a").click;  
// 같음$("#a").trigger("click");  

        })
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>
<button id="a" >ok</button>
 <button id="b">ok-trigger</button>
 <div id="result"></div>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
 $(function(){
	 $("form").on("submit",xxx);
	 });

function xxx (event){
        
        if($("#userid").val().length == 0){
                alert("아이디를 입력하세요");
                event.preventDefault();
        }
    }

</script>
<title>Insert title here</title>
</head>
<body>
<form action="target.html">
	아이디: <input type="text" id="userid" name="userid"><br>
<input type="submit" value="로그인">
</form>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
 $(function(){
	  $("#a").click(function() {
            if($("#userid").val().length == 0){
				alert("아이디를 입력하세요");
                //event.preventDefault();
                return ;
            }$("form").submit();
        })
});



			
	
</script>
<title>Insert title here</title>
</head>
<body>
<form action="target.html">
	아이디: <input type="text" id="userid"   name="userid"><br>

</form>
<hr>
<button id="a">버튼</button>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
		$("#target").on("focus",function(){
			console.log("target focus====");
			$(this).css("background","yellow");
		})
				$("#target").on("blur",function(){
			console.log("target blur====");
			$(this).css("background","");
		})
		$("#other").on("click",function(){
			console.log("other클릭");
			$("#target").trigger("focus");//trigger
		})
		$("#other2").on("click",function(){
			$("#target").blur();//trigger
		})		
		$("#other3").on("click",function(){
			$("#target").off("blur focus");//이벤트 제거
		})
    });
		
	
</script>
<title>Insert title here</title>
</head>
<body>
<form >
<input type="text" id="target">
<input type="text" >
</form>
<button id="other">focus</button>
<button id="other2">blur</button>
<button id="other3">clear</button>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
		$("input").on("select", function(){
			console.log("이벤트 발생");
			$("div").text(document.getSelection()).show().fadeOut(2000); // 3초 천천히 뒤에 사라짐
			console.log(document.getSelection());
		})
    });

</script>
<title>Insert title here</title>
</head>
<body>
<p>select 실습 </p>
<input type="text" value="아이템 1 아이템2">
<div></div>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
$("#test").keydown(function(){
$("#result").text(event.keyCode);

        })

            $("#test").on("input", function(){
                $("#result").html($(this).val());
            });        
    });

</script>
<title>Insert title here</title>
</head>
<body>
<p>keydown 실습 </p>
<input type="text" id="test">
<div id="result"></div>
</body>
</html>

아스키코드

 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
		$("div").click(function(){
			console.log($(this).text());
			$("#result").html("<h1>"+$(this).text()+"</h1>");
		})
  
    });

</script>
<title>Insert title here</title>
</head>
<body>
<div>홍길동</div>
<div>이순신</div>
<div>유관순</div>
<span id="result"></span>
</body>
</html>

클릭한 이름의 this 값을 꺼내옴

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
$("#outer").mouseenter(function(){
	$("#log").append("<div>mouseEnter  발생</div>");
})
  
    });

</script>
<title>Insert title here</title>
</head>
<body>
<div id="outer">outer
<div id="inner">inner</div>
</div>

<div id="log"> </div>n>
</body>
</html>

$(function(){
$("#outer").mouseover(function(){
	$("#log").append("<div> mouseOver  발생</div>");
})
  
    }); //자식힌테도 발생

$(function(){
$("#outer").mouseleave(function(){
	$("#log").append("<div> mouseleave  발생</div>");
})
  
    }); // 자식에게는 안됨

$("#outer").mouseout(function(){
	$("#log").append("<div> mouseOut  발생</div>");
})
  
    });//자식도 발생

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function(){
$("li").hover(
function(){
	$(this).append($("<span>***</span>"))
},function(){
	$(this).find("span").remove();
}
)
  
    });

</script>
<title>Insert title here</title>
</head>
<body>
<ul>
    <li>홍길동</li>
    <li>이순신</li>
    <li class="fade">유관순</li>
    <li class="fade">강감찬</li>
</ul>
</body>
</html>

마우스오버하면 ***의 위치가 바뀜

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
		
 function allchk(){ 

	var allchk= document.getElementById("all");
	var fruit= document.getElementsByClassName("fruit");
	for (var i = 0; i < fruit.length; i++) {
		fruit[i].checked =allchk.checked;
	}
	 
    }
function ok(){
        var fruit = document.querySelectorAll(".fruit:checked");
        var mesg = "";
        for(var i = 0 ; i<fruit.length; i++){
            mesg=mesg+fruit[i].value+"\t";
        }
        document.getElementById("result").innerText=mesg;
    }	
</script>	
<title>Insert title here</title>
</head>
<body>
<input type="checkbox" id="all" onclick="allchk()">전체 선택<br>

<input type="checkbox" class="fruit" value="사과">사과
<input type="checkbox" class="fruit" value="배">배
<input type="checkbox" class="fruit" value="귤">귤
<button id="test" onclick="ok()">확인</button>
<div id="result"></div>
</body>
</html>

**window.onload** 이벤트는 웹 페이지의 모든 리소스가 로드되고 DOM이 완전히 생성된 후에 코드를 실행하기 위해 사용됩니다.

**이벤트 리스너 등록:** 특정 DOM 요소에 이벤트 리스너를 등록하려는 경우에 사용됩니다.

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
        // window.onload 사용
        window.onload = function() {
            document.getElementById("all").addEventListener("change",allchk, false); 
				 document.getElementById("test").addEventListener("click",ok, false); 
}
 function allchk(){ 

	var allchk= document.getElementById("all");
	var fruit= document.getElementsByClassName("fruit");
	for (var i = 0; i < fruit.length; i++) {
		fruit[i].checked =allchk.checked;
	}
	 
    }
function ok(){
        var fruit = document.querySelectorAll(".fruit:checked");
        var mesg = "";
        for(var i = 0 ; i<fruit.length; i++){
            mesg=mesg+fruit[i].value+"\t";
        }
        document.getElementById("result").innerText=mesg;
    }

    </script>
<title>Insert title here</title>
</head>
<body>
<input type="checkbox" id="all" >전체 선택<br><!-- addEventListener -->
<input type="checkbox" class="fruit" value="사과">사과
<input type="checkbox" class="fruit" value="배">배
<input type="checkbox" class="fruit" value="귤">귤
<button id="test">확인</button>
<div id="result"></div>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
	$("#all").on("click", function(){
		var arr = $(".fruit");
		for(let box of arr){
			box.checked = this.checked;
		}
	})
		$("#test").on("click", function(){
		var arr = $(".fruit");
		var str="";
		for(var i =0; i< arr.length; i++){
			var c = arr[i];
			if (c.checked){
				str= str +c.value;
			}
		}
		$("#result").text(str);
	})
})       

    </script>
<title>Insert title here</title>
</head>
<body>
<input type="checkbox" id="all">전체 선택<br>
<input type="checkbox" class="fruit" value="사과">사과
<input type="checkbox" class="fruit" value="배">배
<input type="checkbox" class="fruit" value="귤">귤
<button id="test">확인</button>
<div id="result"></div>
</body>
</html>

 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
	$("#all").click(function(){
		var chk = this.checked;
		$.each($(".fruit"),function(idx, ele){
			ele.checked= chk; //this 가 ele 와 같아서 쓸수 없ㅁ
		})
	})
	
	 
		$("#test").click(function(){
			//1.
/*		var data = $(".fruit");
		var mesg="";
		for(var i =0; i< data.length; i++){
			if (data[i].checked){
				mesg+=  data[i].value+ "&nbsp;&nbsp;";
			}
		}
		///////////////////////
		//2.
		var data = $(".fruit:checked");
		var mesg="";
		for (var i =0; i< data.length; i++){
			mesg+= data[i].value+"&nbsp;&nbsp;&nbsp;";
		}
		///////////////////////////////////
		//3.
		var data = $(".fruit");
		var mesg="";
		$.each(data, function(idx, ele) {
    if (ele.checked) {
        mesg += ele.value + "&nbsp;&nbsp;";
    }
});*/
/////////////////////////////
//4.
var data = $(".fruit");
		var mesg="";
		$.each($(".fruit:checked"), function(idx, data) {
   
        mesg +=data.value + "&nbsp;&nbsp;";
});
		$("#result").html(mesg);
	})
	//////////////////////
	
})       

    </script>
<title>Insert title here</title>
</head>
<body>
<input type="checkbox" id="all">전체 선택<br>
<input type="checkbox" class="fruit" value="사과">사과
<input type="checkbox" class="fruit" value="배">배
<input type="checkbox" class="fruit" value="귤">귤
<button id="test">확인</button>
<div id="result"></div>
</body>
</html>

 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
       $(function(){
		   $("#all").click(function(){
			   var chk = this.checked;
			   s.each ($(".fruit"), function(idx, ele){
				   ele.checked=chk;
			   })
		   })
		   $("test").click(function(){
			  var data = $(".fruit");
			  var mesg="";
			  $.each($(".fruit:checked"),function(idx, data ){
				  mesg+= data.value+"&nbsp;&nbsp;";
				  
			  }) 
			  $("#result").html(mesg);
		   })
	   })
    </script>
<title>Insert title here</title>
</head>
<body>
<input type="checkbox" id="all">전체 선택
<input type="checkbox" class="fruit" value="사과">사과
<input type="checkbox" class="fruit" value="배">배
<input type="checkbox" class="fruit" value="귤">귤
<button id="test">확인</button>
<div id="result"></div>
</body>
</html>

ajax

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>attribute(속성)</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script type="text/javascript">
	$(function () {
		$("#a").on("click",getData );//실행함수등록 
		
	});//end ready 
	
	function getData() {//비동기 실행함수 
		// $.ajax({ jsonObject형식으로 설정      })
		$.ajax(
			{
			type:"get",//서버에 get/post방식 요청 
			url:"sample01_text.jsp",  //서버 요청 주소 
			dataType:"text",//응답data타입 text, json, xml , html
			success: function (data, status, xhr) {//요청에 대한 응답이 성공했을 때 동작할 코드 
				//data: 응답으로 비동기 전송된 data
				console.log("success : ", data);
				console.log("xhr", xhr.status);
					$("#result").text(data);
				//	console.log(status, xhr);
				},//end success
			error: function (xhr, status, e) {//요청에 대한 응답이 error 인 경우 때 동작할 코드
				console.log("error", e);
				console.log("xhr", xhr.status);
				$("#result").text("데이터를 가져올 수 없습니다.");
			//	console.log("status", status)				
				}//error 
			}//
		);	//ajax end 
	}//end getData
	
</script>
</head>
<body>
 <button id="a">ajax요청</button>
 <div id="result"></div>
</body>
</html>

 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>attribute(속성)</title>
<script type="text/javascript" src="../jquery-3.5.1.min.js"></script>
<script type="text/javascript">
//client get jsp요청, respose로 text데이터를 받아서 브라우저에 출력 
	$(function () {
		$("button").on("click",function () {
			$.ajax({
					type:"get",//get방식 요청
					url:"sample01_text.jsp",
					dataType:"text",//응답타입
					success: function (data, status, xhr) {
						$("#result").text(data);
					},
					error: function (xhr, status, e) {
						console.log("error", e);
						console.log("status", status);
						
					}
				});	 //end ajax		
			}  //end function
		);// button 		
	});//end ready
	
</script>
</head>
<body>
 <button id="a">ajax요청</button>
 <div id="result"></div>
</body>
</html>

 

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