Directive in AngularJS to customize a table_AngularJS

Let me first tell you the requirements for the form:

● Table structure

<table>
<thead>
<tr>
<th>Name</th>
<th>Street</th>
<th>Age</th>
</tr>
</thead>
<tbody>
<tr>
<td>></td>
<td>></td>
<td>></td>
</tr>
</tbody>
</table>
<div>4行</div>

● Click on a th to sort the column
● You can give the header an alias
● You can set whether a certain column displays
● There is a row below the table showing the total number of rows

We want the table to look like this:

<table-helper datasource="customers" clumnmap="[{name: 'Name'}, {street: 'Street'}, {age: 'Age'}, {url: 'URL', hidden: true}]"></table-helper>

Above, the data source of datasource comes from $scope.customers in controller, which is roughly in the format of {name: 'David', street: '1234 Anywhere St.', age: 25, url: 'index.html'} , the details are omitted.

columnmap is responsible for aliasing columns and deciding whether to display a column.

How to achieve it?

Directive is roughly like this:

var tableHelper = function(){
var template = '',
link = function(scope, element, attrs){
}
return {
restrict: 'E',
scope: {
columnmap: '=',
datasource: '='
},
link:link,
template:template
}; 
}
angular.module('directiveModule')
.directive('tableHelper', tableHelper); 

Specifically,

First, monitor the changes in the datasource. Once there are changes, reload the table.

scope.$watchCollection('datasource', render);
//初始化表格
function render(){
if(scope.datasource && scope.datasource.length){
table += tableStart;
table += renderHeader();
table += renderRows() + tableEnd;
//加载统计行
renderTable();
}
} 

Loading the table is roughly divided into three steps, loading the table header, loading the table body, and loading the statistical rows.

//加载头部
function renderHeader(){
var tr = '<tr>';
for(var prop in scope.datasource[0]){
//{name: 'David',street: '1234 Anywhere St.',age: 25,url: 'index.html'}
//根据原始列名获取别名,并考虑了是否显示列的情况
var val = getColumnName(prop);
if(val){
//visibleProps存储的是原始列名
visibleProps.push(prop);
tr += '<th>' + val + '</th>';
}
}
tr += '</tr>';
tr = '<thead>' + tr '</thead>';
return tr;
}
//加载行
function renderRows(){
var rows = '';
for(var i = 0, len = scope.datasource.length; i < len; i++){
rows += '<tr>';
var row = scope.datasource[i];
for(var prop in row){
//当前遍历的原始列名是否在visibleProps集合中，该集合存储的是原始列名
if(visibleProps.indexOf(prop) > -1){
rows += '<td>' + row[prop] + '</td>';
}
}
rows += '</tr>';
}
rows = '<tbody>' + rows + '</tbody>';
return rows;
}
//加载统计行
function renderTable(){
table += '<br /><div class="rowCount">' + scope.datasource.length + '行</div>';
element.html(table);
table = '';
} 

When loading the table header, a method is used to obtain the alias based on the original column name.

//根据原始列名获取列的别名，并考虑是否隐藏列的情况
function getColumnName(prop){
if(!scope.columnmap) return prop;
//得到[{name: 'Name'}]
var val = filterColumnMap(prop);
if(val && val.length && !val[0].hidden) return val[0][prop];
else return null;
}

In the getColumnName method, a column based on the original column name is used

//比如根据name属性，这里得到[{name: 'Name'}]
//[{name: 'Name'}, {street: 'Street'}, {age: 'Age'}, {url: 'URL', hidden: true}]
function filterColumnMap(prop) {
var val = scope.columnmap.filter(function(map) {
if (map[prop]) {
return true;
}
return false;
});
return val;
}

The specific code is as follows:

(function(){
var tableHelper = fucntion(){
var template = '
',
link = function(scope, element, attrs){
var headerCols = [], //表头列们
tableStart = '',
tableEnd = '',
table = '',
visibleProps = [],//可见列
sortCol = null,//排序列
sortDir =1;
//监视集合
sscope.$watchCollection('datasource', render);
//给表头th绑定事件
wireEvents();
//初始化表格
function render(){
if(scope.datasource && scope.datasource.length){
table += tableStart;
table += renderHeader();
table += renderRows() + tableEnd;
//加载统计行
renderTable();
}
}
//给th添加click事件
function wireEvents()
{
element.on('click', function(event){
if(event.srcElement.nodeName === 'TH'){
//获取列的名称
var val = event.srcElement.innerHTML;
//根据列的别名获取原始列名
var col = (scope.columnmap) ? getRawColumnName(val) : val;
if(col){
//对该列进行排序
sort(col);
}
}
});
}
//给某列排序
function sort(col){
if(sortCol === col){
sortDir = sortDir * -1;
}
sortCol = col;
scope.datasource.sort(function(a,b){
if(a[col] > b[col]) return 1 * sortDir;
if(a[col] < b[col]) return -1 * sortDir;
return 0;
});
//重新加载表格
render();
}
//加载头部
function renderHeader(){
var tr = '';
for(var prop in scope.datasource[0]){
//{name: 'David',street: '1234 Anywhere St.',age: 25,url: 'index.html'}
//根据原始列名获取别名,并考虑了是否显示列的情况
var val = getColumnName(prop);
if(val){
//visibleProps存储的是原始列名
visibleProps.push(prop);
tr += '' + val + '';
}
}
tr += '';
tr = '' + tr '';
return tr;
}
//加载行
function renderRows(){
var rows = '';
for(var i = 0, len = scope.datasource.length; i < len; i++){
rows += '';
var row = scope.datasource[i];
for(var prop in row){
//当前遍历的原始列名是否在visibleProps集合中，该集合存储的是原始列名
if(visibleProps.indexOf(prop) > -1){
rows += '' + row[prop] + '';
}
}
rows += '';
}
rows = '' + rows + '';
return rows;
}
//加载统计行
function renderTable(){
table += '
' + scope.datasource.length + '行
';
element.html(table);
table = '';
}
//根据列的别名获取原始列名
function getRawColumnName(friendlyCol) {
var rawCol;
//columnmap =[{name: 'Name'}, {street: 'Street'}, {age: 'Age'}, {url: 'URL', hidden: true}]
scope.columnmap.forEach(function(colMap) {
//{name: 'Name'}
for (var prop in colMap) {
if (colMap[prop] === friendlyCol) {
rawCol = prop;
break;
}
}
return null;
});
return rawCol;
}
function pushColumns(rawCol, renamedCol) {
visibleProps.push(rawCol);
scope.columns.push(renamedCol);
}
//比如根据name属性，这里得到[{name: 'Name'}]
//[{name: 'Name'}, {street: 'Street'}, {age: 'Age'}, {url: 'URL', hidden: true}]
function filterColumnMap(prop) {
var val = scope.columnmap.filter(function(map) {
if (map[prop]) {
return true;
}
return false;
});
return val;
} 
//根据原始列名获取列的别名，并考虑是否隐藏列的情况
function getColumnName(prop){
if(!scope.columnmap) return prop;
//得到[{name: 'Name'}]
var val = filterColumnMap(prop);
if(val && val.length && !val[0].hidden) return val[0][prop];
else return null;
}
};
return {
restrict: 'E',
scope: {
columnmap: '=',
datasource: '='
},
link:link,
template:template
};
};
angular.module('directiveModule')
.directive('tableHelper', tableHelper);
}());

The above is the knowledge shared by the editor about customizing a table using Directive in AngularJS. I hope it will be helpful to you.