如何将EventListener添加到表格单元格 [英] How to addEventListener to table cells
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问题描述
我想向表格单元格添加一个事件监听器，以便每次单击表格单元格执行一个函数.
var getDaysInMonth = function (year, month) {返回新日期(年，月，0).getDate()；}var 日历 = {月份:函数(){var d = 新日期();返回 d.getMonth() + this.nextMonth;},年:函数(){var y = 新日期();返回 y.getFullYear();},下个月:1，cellColor: '白色',}var loopTable = function () {var daysInMonth = getDaysInMonth(calendar.year(), calendar.month());var table = document.getElementById('myTable');var 行 = table.rows;无功l = 1;var 月份 = calendar.month();var year = calendar.year();var firstDay = new Date(year + "-" + month).getDay();var currentDay = new Date().getDay();var dayOfMonth = new Date().getDate();for (让 i = 1; i < rows.length; i++) {如果(行 [i] == 行 [1]){无功k = 1;for (let j = firstDay; j body {背景颜色:rgb(0, 121, 191);}桌子 {宽度:50%；背景颜色:#D9534F；边框:1px纯白色；填充:10px；填充底部:20px；字体大小:25px；边框半径:25px；位置:相对；保证金:自动；}TD{边框:1px纯白色；文本对齐:居中；字体粗细:600；字体大小:20px；填充:20px；}第 {高度:50px；}.calArrows {文字装饰:无；白颜色;字体大小:35px；}#nxt {字体大小:30px；位置:绝对；顶部:0；正确:25%}#prev {字体大小:30px；位置:绝对；顶部:0；左:25%；}#calendarTitle {font-family: '独立花'，草书；字体粗细:600；字体大小:25px；白颜色;}.inactiveLink {游标:不允许；指针事件:无；}#myTable {空单元格:隐藏；}.xmasDec {宽度:90%；高度:70%；位置:绝对；前10名％;左:5%；}#calWraper {位置:相对；}#myCan {位置:绝对；顶部:0；左:10%；宽度:90%；高度:70%；不透明度:0、5；}<canvas class="myCan" width="100" height="100"></canvas><div id="calWraper"><table id="myTable"><caption id="calendarTitle">测试</caption><tr><th>Sun</th><th>周一</th><th>周二</th><th>周三</th><th>星期四</th><th>周五</th><th>周六</th></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td></tr><canvas id="myCan" width="200" height="200" style="background-color: transparent"></canvas><a href="#" id="prev" class="calArrows"><i class="fa fa-arrow-left" ></i></a><a href="#" id="nxt" class="calArrows"><i class="fa fa-arrow-right" ></i></a></html>
我尝试通过创建一个函数来循环遍历行和单元格并将 eventListener 添加到每个 .但它似乎不起作用，它在随机实例上工作，这真的很奇怪.这是我创建的函数:
function clickCell() {var row = document.getElementById('myTable').rows;for (var i = 0; i < row.length; i++) {for (var j = 0; j 解决方案
您的画布似乎与您的表格重叠.因为你的表格中的 td 元素永远不会被点击.
您需要将 CSS 属性 pointer-events:none 添加到您的画布.
#myCan {...指针事件:无；}这样就不会再阻止点击表格了.
您还可以更简单地向单元格添加事件侦听器:
document.querySelectorAll('#myTable td').forEach(e => e.addEventListener("click", function() {//这里，`this` 指的是事件被挂钩的元素console.log("点击")}));为每个单元格创建一个单独的函数；相反，您可以共享一个功能而不会丢失任何功能:
function clickHandler() {//这里，`this` 指的是事件被挂钩的元素console.log("点击")}document.querySelectorAll('#myTable td').forEach(e => e.addEventListener("click", clickHandler));<小时>
有些浏览器在 querySelectorAll 返回的 HTMLCollection 上仍然没有 forEach，但它很容易被 polyfill:
if (!HTMLCollection.prototype.forEach) {Object.defineProperty(HTMLCollection.prototype, "forEach", {值:Array.prototype.forEach});}如果您必须支持没有 Array.prototype.forEach 的真正过时的浏览器，请参阅 MDN 上的 polyfill.
I'want to add an eventListener to the table cells so each time a table cell is clicked to execute a function .
var getDaysInMonth = function (year, month) {
return new Date(year, month, 0).getDate();
}
var calendar = {
month: function () {
var d = new Date();
return d.getMonth() + this.nextMonth;
},
year: function () {
var y = new Date();
return y.getFullYear();
},
nextMonth: 1,
cellColor: 'white',
}
var loopTable = function () {
var daysInMonth = getDaysInMonth(calendar.year(), calendar.month());
var table = document.getElementById('myTable');
var rows = table.rows;
var l = 1;
var month = calendar.month();
var year = calendar.year();
var firstDay = new Date(year + "-" + month).getDay();
var currentDay = new Date().getDay();
var dayOfMonth = new Date().getDate();
for (let i = 1; i < rows.length; i++) {
if (rows[i] == rows[1]) {
var k = 1;
for (let j = firstDay; j < rows[i].cells.length; j++) {
if (k === dayOfMonth && calendar.nextMonth === 1) {
rows[i].cells[j].style.backgroundColor = calendar.cellColor;
}
if (k <= daysInMonth) {
rows[i].cells[j].innerHTML = k;
k++
}
}
} else {
for (let j = 0; j < rows[i].cells.length; j++) {
if (k === dayOfMonth && calendar.nextMonth === 1) {
rows[i].cells[j].style.backgroundColor = calendar.cellColor;
}
if (k <= daysInMonth) {
rows[i].cells[j].innerHTML = k;
k++
}
}
}
}
}
loopTable();
clickCell();
function monthTitle() {
var monthsArray = ['Jan.', 'Feb.', 'Mar.', 'Apr.', 'May', 'Jun.', 'Jul.', 'Aug.', 'Sept.', 'Oct.', 'Nov.', 'Dec.'];
monthNum = calendar.month();
var monthName = monthsArray[calendar.month() - 1] + '' + calendar.year();
var title = document.getElementById('calendarTitle');
var nextArrow = document.getElementById('nxt');
var leftArrow = document.getElementById('prev');
if (monthName === ('Dec.' + '' + calendar.year())){
xmas();
}
if (monthNum >= 12) {
nextArrow.className += ' inactiveLink';
} else if (monthNum <= 1) {
leftArrow.className += ' inactiveLink';
} else {
nextArrow.classList.remove('inactiveLink');
leftArrow.classList.remove('inactiveLink');
}
title.innerHTML = '';
var titleNode = document.createTextNode(monthName);
title.appendChild(titleNode);
}
monthTitle();
function nextMonth() {
clearTable();
calendar.nextMonth += 1;
monthTitle();
loopTable();
}
function previousMonth() {
clearTable();
calendar.nextMonth -= 1;
monthTitle();
loopTable();
}
function clearTable() {
var table = document.getElementById('myTable');
var rows = table.rows;
for (var i = 1; i < rows.length; i++) {
cells = rows[i].cells;
for (var j = 0; j < cells.length; j++) {
if (cells[j].innerHTML = '') {
cells[j].style.display = 'none';
}
cells[j].innerHTML = '';
cells[j].style.backgroundColor = '#D9534F';
cells[j].style.emptyCells = 'hide';
}
}
}
var next = document.getElementById('nxt');
var previous = document.getElementById('prev');
var table = document.getElementById('myTable');
var cell = table.rows;
next.addEventListener('click', nextMonth);
previous.addEventListener('click', previousMonth);
function clickCell() {
var row = document.getElementById('myTable').rows;
for (var i = 0; i < row.length; i++) {
for (var j = 0; j < row[i].cells.length; j++ ) {
row[i].cells[j].addEventListener('click', function(){
console.log('click');
})
}
}
}
clickCell();
body {
background-color: rgb(0, 121, 191);
}
table {
width: 50%;
background-color: #D9534F;
border: 1px solid white;
padding: 10px;
padding-bottom: 20px;
font-size: 25px;
border-radius: 25px;
position: relative;
margin: auto;
}
td {
border: 1px solid white;
text-align: center;
font-weight: 600;
font-size: 20px;
padding: 20px;
}
th {
height: 50px;
}
.calArrows {
text-decoration: none;
color: white;
font-size: 35px;
}
#nxt {
font-size: 30px;
position: absolute;
top: 0;
right: 25%
}
#prev {
font-size: 30px;
position: absolute;
top: 0;
left: 25%;
}
#calendarTitle {
font-family: 'Indie Flower', cursive;
font-weight: 600;
font-size: 25px;
color: white;
}
.inactiveLink {
cursor: not-allowed;
pointer-events: none;
}
#myTable {
empty-cells: hide;
}
.xmasDec {
width: 90%;
height: 70%;
position: absolute;
top: -10%;
left: 5%;
}
#calWraper {
position: relative;
}
#myCan {
position: absolute;
top: 0;
left: 10%;
width: 90%;
height: 70%;
opacity: 0, 5;
}
<body>
<canvas class="myCan" width="100" height="100"></canvas>
<div id="calWraper">
<table id="myTable">
<caption id="calendarTitle">Test</caption>
<tr>
<th>Sun</th>
<th>Mon</th>
<th>Tue</th>
<th>Wed</th>
<th>Thur</th>
<th>Fri</th>
<th>Sat</th>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
</table>
<canvas id="myCan" width="200" height="200" style="background-color: transparent"></canvas>
<a href="#" id="prev" class="calArrows"><i class="fa fa-arrow-left" ></i></a>
<a href="#" id="nxt" class="calArrows"><i class="fa fa-arrow-right" ></i></a>
</div>
</html>
I tried by creating a function that it will loop through rows and cells and add the eventListener to each . But it seems that its not working , its working on random instances which is really strange behavior . Here is the function i create:
function clickCell() {
var row = document.getElementById('myTable').rows;
for (var i = 0; i < row.length; i++) {
for (var j = 0; j < row[i].cells.length; j++ ) {
console.log(row[i].cells[j].innerHTML);
row[i].cells[j].addEventListener('click', function(){
console.log('click');
})
}
}
}
解决方案
It seems your canvas is overlapping your table. Because of that td elements in your table are never clicked.
You will need to add CSS property pointer-events:none to your canvas.
#myCan {
...
pointer-events: none;
}
This way it won't block table from being clicked anymore.
You can also add event listeners to your cells way simpler:
document.querySelectorAll('#myTable td')
.forEach(e => e.addEventListener("click", function() {
// Here, `this` refers to the element the event was hooked on
console.log("clicked")
}));
That creates a separate function for each cell; instead, you could share one function without losing any functionality:
function clickHandler() {
// Here, `this` refers to the element the event was hooked on
console.log("clicked")
}
document.querySelectorAll('#myTable td')
.forEach(e => e.addEventListener("click", clickHandler));
Some browsers still don't have forEach on the HTMLCollection returned by querySelectorAll, but it's easily polyfilled:
if (!HTMLCollection.prototype.forEach) {
Object.defineProperty(HTMLCollection.prototype, "forEach", {
value: Array.prototype.forEach
});
}
If you have to support truly obsolete browsers that don't have Array.prototype.forEach, see the polyfill on MDN.
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