자바스크립트, JQuery(제이쿼리): 테이블의 행, 열 번호 표시 & 행, 열번호로 테이블 td 접근하기 (예제: 직선 거리 측정)
테이블 요소에 접근할 때 엑셀처럼 행과 열의 번호(index)를 가지고 접근할 수 있다.
- 행 Element의 행의 번호 구하기:
[TR ELEMENT].rowIndex - 열 Element의 열의 번호 구하기:
[TD ELEMENT].cellIndex - 열 Element의 행의 번호 구하기:
[TD ELEMENT].parentNode.rowIndex - 행, 열 번호로 td Element 가져오기(JQuery):
$([TR Element의 선택자]).eq([행 번호]).find("td").eq([열 번호])
예제: 거리 구하기 (127번 줄 이후만 참고하면 됨)
https://gist.github.com/ayaysir/7cb602605f04ead8468e3d931ed19377
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<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
#mainTable {
border: 1px solid black;
border-collapse: collapse;
width: 600px;
height: 600px
}
#mainTable td {
border: none;
}
</style>
</head>
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
<body>
<div id=wrapper></div>
<script>
var $tableEl = $('<table/>', {
id: "mainTable"
})
for (var i = 1; i <= 100; i++) {
var $trEl = $('<tr/>')
for (var j = 1; j <= 100; j++) {
$trEl.append($('<td/>'))
}
$tableEl.append($trEl)
}
$('#wrapper').append($tableEl)
</script>
<p id="lblSelect1"><strong>선택 1:</strong> <span></span></p>
<p id="lblSelect2"><strong>선택 2:</strong> <span></span></p>
<p id="lblDistance"><strong>거리:</strong> <span></span></p>
<script>
window.onload = function() {
function getDistance(coorObj1, coorObj2) {
var x = coorObj2.row - coorObj1.row
var y = coorObj2.col - coorObj1.col
return Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2))
}
function drawLine(coorObj1, coorObj2) {
var color = "lightgray"
if(coorObj1.col > coorObj2.col){
var temp = coorObj2
coorObj2 = coorObj1
coorObj1 = temp
} else if (coorObj1.row > coorObj2.row && coorObj1.col == coorObj2.col){
for(var i = coorObj2.row + 1; i < coorObj1.row; i++){
$("#mainTable tr").eq(i).find("td").eq(coorObj1.col).css("background-color", color)
}
}
// y = ax + 0
var absX = Math.abs(coorObj2.row - coorObj1.row)
var absY = Math.abs(coorObj2.col - coorObj1.col)
var startpoint = 0
var endpoint = absX > absY ? absX : absY
// alert(absX + ":" + absY)
var a, aCase;
if(absX > absY){
a = (coorObj2.col - coorObj1.col) / (coorObj2.row - coorObj1.row)
aCase = "X"
if(coorObj2.row > coorObj1.row){
startpoint = 1;
endpoint = endpoint - 1
// alert('dnl')
} else {
startpoint = 0;
endpoint = endpoint - 1
// alert('dkfo')
}
} else {
a = (coorObj2.row - coorObj1.row) / (coorObj2.col - coorObj1.col)
aCase = "Y"
startpoint = 0;
endpoint = endpoint - 1
}
for (var i = startpoint; i <= endpoint; i++) {
var targetTr;
if (coorObj2.col > coorObj1.col) {
if (coorObj2.row > coorObj1.row) {
targetTr = (aCase != "X" ? coorObj1.row : coorObj2.col) + Math.abs(Math.round(y, 0))
} else if (coorObj2.row <= coorObj1.row){
targetTr = (aCase != "X" ? coorObj1.row : coorObj2.col) - Math.abs(Math.round(y, 0))
}
}
var y = a * i
// console.log("bet", Math.round(y, 0))
if(aCase == "X"){
if(coorObj1.row > coorObj2.row){
$("#mainTable tr").eq(coorObj2.row + i).find("td").eq(targetTr).css("background-color", color)
} else {
$("#mainTable tr").eq(coorObj1.row + i).find("td").eq(coorObj1.col + Math.abs(Math.round(y, 0))).css("background-color", color)
}
} else {
$("#mainTable tr").eq(targetTr).find("td").eq(coorObj1.col + i).css("background-color", color)
}
}
}
var tdEl = document.getElementsByTagName("td")
var currentCount = 1
var coor1, coor2;
$('#mainTable td').on("click", function(ev) {
var rowIndex = ev.target.parentNode.rowIndex
var colIndex = ev.target.cellIndex
console.log(rowIndex, colIndex)
$('#lblSelect' + currentCount + " span").text("[" + rowIndex + ", " + colIndex + "]")
if (currentCount == 1) {
$("#mainTable td").css("background-color", "")
$("#lblSelect2 span").text("")
$("#lblDistance span").text("")
ev.target.style.backgroundColor = "green"
coor1 = {
row: rowIndex,
col: colIndex
}
currentCount++
} else if (currentCount == 2) {
ev.target.style.backgroundColor = "red"
coor2 = {
row: rowIndex,
col: colIndex
}
$("#lblDistance span").text(Math.round(getDistance(coor1, coor2), 2))
currentCount = 1
drawLine(coor1, coor2)
}
})
}
</script>
</body>
</html>
This post is licensed under
CC BY 4.0
by the author.