javascript:将编号行添加到表中
我想向包含4个单元格的表中添加一行:indexnumber、firstname、lastname和points。作为Javascript的新手,我完全迷恋于textnodes、Child和其他Dom元素。谁可以帮助创建动态索引编号,如第一列中的1、2、3等javascript:将编号行添加到表中,javascript,dom,Javascript,Dom,我想向包含4个单元格的表中添加一行:indexnumber、firstname、lastname和points。作为Javascript的新手,我完全迷恋于textnodes、Child和其他Dom元素。谁可以帮助创建动态索引编号,如第一列中的1、2、3等 var-button=document.getElementById(“addRow”); button.onclick=addRowFunc; var firstName=document.getElementById(“firstN”)
var-button=document.getElementById(“addRow”);
button.onclick=addRowFunc;
var firstName=document.getElementById(“firstN”);
var lastName=document.getElementById(“lastN”);
var points=document.getElementById(“pnt”);
函数addRowFunc(){
var tabel=document.getElementById(“myTable”);
变量行=tabel.insertRow(-1);
var cel1=行插入单元格(0);
var cel2=行插入单元格(1);
var cel3=行插入单元格(2);
var cel4=行插入单元格(3);
cel1.value=函数(){
对于(变量i=1;i
行数
名字
姓氏
要点
名字
姓氏
积分
添加
要插入新行,请使用append
<table id="mytable">
<tr><td >1</td> <td >sd</td> <td >sd</td> <td >sd</td></tr>
<tr><td >2</td> <td >sd</td> <td >sd</td> <td >sd</td></tr>
<tr><td >3</td> <td >sd</td> <td >sd</td> <td >sd</td></tr>
</table>
如果这是您想要的,请进行注释。要插入新行,请使用append
<table id="mytable">
<tr><td >1</td> <td >sd</td> <td >sd</td> <td >sd</td></tr>
<tr><td >2</td> <td >sd</td> <td >sd</td> <td >sd</td></tr>
<tr><td >3</td> <td >sd</td> <td >sd</td> <td >sd</td></tr>
</table>
如果这是您想要的,请进行注释。以下是获取节点和DOM工作方式的最简单方法:) 因此,假设您有一个数据数组,其格式如下:
data = [
{
indexNumber: 1,
firstName: 'Bon',
lastName: 'Jovi',
points: 50,
},
{
indexNumber: 2,
firstName: 'Ann',
lastName: 'Hathaway',
points: 60,
},
];
现在,您可以在forEach
循环中处理此数组:
var table = document.getElementById('myTable');
data.forEach(function(element) {
var row = document.createElement('tr');
var cell1 = document.createElement('td');
var cell2 = document.createElement('td');
var cell3 = document.createElement('td');
var cell4 = document.createElement('td');
cell1.innerHTML = element.indexNumber;
cell2.innerHTML = element.firstName;
cell3.innerHTML = element.lastName;
cell4.innerHTML = element.points;
row.appendChild(cell1);
row.appendChild(cell2);
row.appendChild(cell3);
row.appendChild(cell4);
table.appendChild(row);
});
下面是了解节点和DOM如何工作的最简单方法:) 因此,假设您有一个数据数组,其格式如下:
data = [
{
indexNumber: 1,
firstName: 'Bon',
lastName: 'Jovi',
points: 50,
},
{
indexNumber: 2,
firstName: 'Ann',
lastName: 'Hathaway',
points: 60,
},
];
现在,您可以在forEach
循环中处理此数组:
var table = document.getElementById('myTable');
data.forEach(function(element) {
var row = document.createElement('tr');
var cell1 = document.createElement('td');
var cell2 = document.createElement('td');
var cell3 = document.createElement('td');
var cell4 = document.createElement('td');
cell1.innerHTML = element.indexNumber;
cell2.innerHTML = element.firstName;
cell3.innerHTML = element.lastName;
cell4.innerHTML = element.points;
row.appendChild(cell1);
row.appendChild(cell2);
row.appendChild(cell3);
row.appendChild(cell4);
table.appendChild(row);
});
解决您面临的问题的一种方法是,使用CSS可以解决显示表格行元素的编号的问题,并遵循以下规则:
tbody {
counter-reset: rownumber;
}
tr {
counter-increment: rownumber;
}
td:first-child::before {
content: counter(rownumber, decimal);
}
上面定义了计数器,行号
,并通过
元素将其重置;因此,如果将行追加到多个
元素上,则每个
元素的后代将相互独立地编号。如果您希望对所有
元素进行连续计数,则只需将计数器重置
规则向上移动到
元素,或移动到需要累积计数的任何其他(理想情况下是最接近的)祖先
该计数器在每个
元素中递增1
,然后显示在每个
子元素的第一个
伪元素之前的:。counter()
的第二个参数是您希望使用的计数器类型(请参阅此答案了解(当前)可能的选项:(免责声明:这是我的答案之一,第二个代码片段将允许您查看不同计数器类型的结果)
因此,我也重写了这一部分——我想说是修订或重构,但这充其量只是轻描淡写——您将代码发布到以下函数中。注释中解释了代码:
// a named function to call:
function addRow() {
// using 'let' to declare variables, this is mostly a
// matter of personal preference in this case, and if
// 'let' is unavailable to you, or your users, can be
// replaced with 'var'.
// here we define a 'details' Object to hold the
// variables from the <input> elements we find
// later:
let details = {},
// we use document.querySelector() to retrieve the first,
// if any, elements matching the supplied CSS selector;
// this is the element to which new content will be added:
target = document.querySelector('#myTable tbody'),
// and again we use document.querySelector() to find the
// element we'll be cloning in order to append the new
// new content:
source = document.querySelector('#myTable tfoot tr.template')
// we pass (Boolean) true as an argument in order to copy
// the descendants of the cloned node as well as the node
// itself:
.cloneNode(true),
// here we use Array.from() to convert the Array-like
// HTMLCollection returned from document.querySelectorAll()
// (which retrieves all the elements which match the
// supplied CSS selector) into an Array:
inputs = Array.from(
document.querySelectorAll('form label input')
);
// we make use of the Array, via Array methods such as,
// here, Array.prototype.forEach(), which iterates over
// the elements of the Array:
inputs.forEach(
// using an Arrow function, rather than the traditional
// anonymous function; here 'input' refers to the current
// Array element of the Array of <input> elements over
// which we're iterating.
// here we update the details Object, by adding a new
// key (details[input.id]) and setting the value of that
// key to the value (input.value) held in the <input>:
input => details[input.id] = input.value
);
// here we convert the Array-like NodeList of child-
// elements of the source (the <tr> element we cloned
// earlier) into an Array, again using Array.from, and
// then iterating over those elements using, again,
// Array.prototype.forEach():
Array.from(source.children).forEach(
// in this Arrow function we're naming the
// current Array-element 'cell', the name is
// purely a personal choice, and can be almost
// anything, so long as it's valid in JavaScript.
// here we set the text-content of the current
// cell (<td> element) to be equivalent to the
// value held in the details Object at the same
// custom data-* attribute, here data-from, as
// the current <td> (details.cell.dataset.from);
// if there is no key of that name, we set the
// text to an empty String (''):
cell => cell.textContent = details[cell.dataset.from] || ''
);
// we append the newly modified <tr> element to
// the target element (the <tbody>):
target.appendChild(source);
// and here we iterate over the <input> elements:
inputs.forEach(
// and set the value of each <input> back to
// its default value, the value it held on
// page-load in order to save the user having
// to first delete existing content before
// entering new content to add:
input => input.value = input.defaultValue
);
}
document.querySelector('#addRow').addEventListener('click', addRow);
正文{
框大小:边框框;
}
标签{
显示:块;
宽度:55%;
溢出:隐藏;
保证金:0.5em0;
}
桌子{
表布局:固定;
宽度:90%;
保证金:1em自动;
边界塌陷:塌陷;
}
标签输入{
宽度:50%;
浮动:对;
}
th,
运输署{
左边框:1px实心#000;
边框底部:1px实心#000;
线高:2米;
高度:2米;
}
th{
文本对齐:居中;
}
赛后{
内容:':';
}
td:第一个孩子,
第一个孩子{
左边框颜色:透明;
}
t车身{
计数器复位:行数;
}
tbody tr{
计数器增量:行数;
}
tbody td:第一个孩子::之前{
内容:计数器(行数、小数);
}
tfoot tr.template{
显示:无;
}
添加新的详细信息:
名字
姓氏
要点
添加
行数
名字
姓氏
要点
解决您面临的问题的一种方法是,使用CSS可以解决显示表格行元素编号的问题,并遵循以下规则:
tbody {
counter-reset: rownumber;
}
tr {
counter-increment: rownumber;
}
td:first-child::before {
content: counter(rownumber, decimal);
}
上面定义了计数器,rownumber
,并通过
元素将其重置;因此,如果将行追加到多个
元素上,则每个
的后代将彼此独立地编号。如果您希望连续计数所有
元素,则只需移动>计数器重置
规则直到
元素,或任何其他(理想情况下是最接近的)祖先,您需要在其内进行累积计数
该计数器在每个
元素中递增1
,然后显示在每个
子元素的第一个
伪元素之前的:中。counter()
的第二个参数是您希望使用的计数器类型(有关(当前)可能选项,请参阅此答案:(免责声明:这是我的答案之一,第二个片段将允许您查看不同计数器类型的结果)
因此,我也重写了这一部分——我想说是修订或重构,但这充其量只是轻描淡写——您将代码发布到以下函数中。注释中解释了代码:
// a named function to call:
function addRow() {
// using 'let' to declare variables, this is mostly a
// matter of personal preference in this case, and if
// 'let' is unavailable to you, or your users, can be
// replaced with 'var'.
// here we define a 'details' Object to hold the
// variables from the <input> elements we find
// later:
let details = {},
// we use document.querySelector() to retrieve the first,
// if any, elements matching the supplied CSS selector;
// this is the element to which new content will be added:
target = document.querySelector('#myTable tbody'),
// and again we use document.querySelector() to find the
// element we'll be cloning in order to append the new
// new content:
source = document.querySelector('#myTable tfoot tr.template')
// we pass (Boolean) true as an argument in order to copy
// the descendants of the cloned node as well as the node
// itself:
.cloneNode(true),
// here we use Array.from() to convert the Array-like
// HTMLCollection returned from document.querySelectorAll()
// (which retrieves all the elements which match the
// supplied CSS selector) into an Array:
inputs = Array.from(
document.querySelectorAll('form label input')
);
// we make use of the Array, via Array methods such as,
// here, Array.prototype.forEach(), which iterates over
// the elements of the Array:
inputs.forEach(
// using an Arrow function, rather than the traditional
// anonymous function; here 'input' refers to the current
// Array element of the Array of <input> elements over
// which we're iterating.
// here we update the details Object, by adding a new
// key (details[input.id]) and setting the value of that
// key to the value (input.value) held in the <input>:
input => details[input.id] = input.value
);
// here we convert the Array-like NodeList of child-
// elements of the source (the <tr> element we cloned
// earlier) into an Array, again using Array.from, and
// then iterating over those elements using, again,
// Array.prototype.forEach():
Array.from(source.children).forEach(
// in this Arrow function we're naming the
// current Array-element 'cell', the name is
// purely a personal choice, and can be almost
// anything, so long as it's valid in JavaScript.
// here we set the text-content of the current
// cell (<td> element) to be equivalent to the
// value held in the details Object at the same
// custom data-* attribute, here data-from, as
// the current <td> (details.cell.dataset.from);
// if there is no key of that name, we set the
// text to an empty String (''):
cell => cell.textContent = details[cell.dataset.from] || ''
);
// we append the newly modified <tr> element to
// the target element (the <tbody>):
target.appendChild(source);
// and here we iterate over the <input> elements:
inputs.forEach(
// and set the value of each <input> back to
// its default value, the value it held on
// page-load in order to save the user having
// to first delete existing content before
// entering new content to add:
input => input.value = input.defaultValue
);
}
document.querySelector('#addRow').addEventListener('click', addRow);
正文{
框大小:边框框;
}
标签{
显示:块;
宽度:55%;
溢出:隐藏;
保证金:0.5em0;
}
桌子{
表布局:固定;
宽度:90%;
保证金:1em自动;
边界塌陷:塌陷;
}
标签输入{
宽度:50%;
浮动:对;
}
th,
运输署{
左边框:1px实心#000;
边框底部:1px实心#000;
线高:2米;
高度:2米;
}
th{
文本对齐:居中;
}
赛后{
内容:':';
}
td:第一个孩子,
第一个孩子{
左边框颜色:透明;
}
t车身{
计数器复位:行数;
}
t车身t