Created
October 31, 2013 03:38
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| .hidden{ | |
| display: none; | |
| } | |
| .visible{ | |
| display: inline; | |
| background-color: #f99; | |
| padding: 4px 1em; | |
| color: #333; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <div> | |
| <input type="text" id="name"> | |
| <button id="btn">追加</button> | |
| <p id="error" class="hidden">その名前は既に存在します</p> | |
| </div> | |
| <ul id="list"></ul> | |
| </body> | |
| </html> |
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| var nameList = []; | |
| var btn = document.getElementById("btn"); | |
| var input = document.getElementById("name"); | |
| var list = document.getElementById("list"); | |
| var error = document.getElementById("error"); | |
| var showNameList = function(list){ | |
| list.innerHTML = "<li>" + nameList.join("</li><li>") + "</li>"; | |
| }; | |
| var indexOf = function(name){ | |
| var i = 0; | |
| while(i < nameList.length){ | |
| if(name == nameList[i]){ | |
| return i; | |
| } | |
| i = i + 1; | |
| } | |
| return -1; | |
| }; | |
| var exists = function(name){ | |
| return indexOf(name) >= 0; | |
| }; | |
| var showErrorMessage = function(){ | |
| error.setAttribute("class", "visible"); | |
| }; | |
| var hideErrorMessage = function(){ | |
| error.setAttribute("class", "hidden"); | |
| }; | |
| btn.onclick = function(){ | |
| hideErrorMessage(); | |
| if(!exists(input.value)){ | |
| nameList.push(input.value); | |
| showNameList(list); | |
| }else{ | |
| showErrorMessage(); | |
| } | |
| }; |
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