Easily learn the jQuery plug-in EasyUI EasyUI to create CRUD applications_jquery

Data collection and proper management of data are common necessities for network applications. CRUD allows us to generate page lists and edit database records. This tutorial will show you how to implement a CRUD DataGrid using the jQuery EasyUI framework.
We will use the following plugin:
datagrid: Display list data to the user.
dialog: Create or edit a single user message.
form: is used to submit form data.
messager: Display some operation information.

1. Create CRUD application with EasyUI
Step 1: Prepare the database

We will use MySql database to store user information. Create the database and 'users' table.

Step 2: Create DataGrid to display user information

Create a DataGrid without javascript code.

<table id="dg" title="My Users" class="easyui-datagrid" style="width:550px;height:250px"
 url="get_users.php"
 toolbar="#toolbar"
 rownumbers="true" fitColumns="true" singleSelect="true">
 <thead>
 <tr>
 <th field="firstname" width="50">First Name</th>
 <th field="lastname" width="50">Last Name</th>
 <th field="phone" width="50">Phone</th>
 <th field="email" width="50">Email</th>
 </tr>
 </thead>
</table>
<div id="toolbar">
 <a href="#" class="easyui-linkbutton" iconCls="icon-add" plain="true" onclick="newUser()">New User</a>
 <a href="#" class="easyui-linkbutton" iconCls="icon-edit" plain="true" onclick="editUser()">Edit User</a>
 <a href="#" class="easyui-linkbutton" iconCls="icon-remove" plain="true" onclick="destroyUser()">Remove User</a>
</div>

We don’t need to write any javascript code to display the list to the user, as shown below:

DataGrid uses the 'url' attribute and is assigned the value 'get_users.php' to retrieve data from the server.
Code for get_users.php file

$rs = mysql_query('select * from users');
$result = array();
while($row = mysql_fetch_object($rs)){
 array_push($result, $row);
}
 
echo json_encode($result);

Step 3: Create form dialog

We use the same dialog box to create or edit users.

<div id="dlg" class="easyui-dialog" style="width:400px;height:280px;padding:10px 20px"
 closed="true" buttons="#dlg-buttons">
 <div class="ftitle">User Information</div>
 <form id="fm" method="post">
 <div class="fitem">
 <label>First Name:</label>
 <input name="firstname" class="easyui-validatebox" required="true">
 </div>
 <div class="fitem">
 <label>Last Name:</label>
 <input name="lastname" class="easyui-validatebox" required="true">
 </div>
 <div class="fitem">
 <label>Phone:</label>
 <input name="phone">
 </div>
 <div class="fitem">
 <label>Email:</label>
 <input name="email" class="easyui-validatebox" validType="email">
 </div>
 </form>
</div>
<div id="dlg-buttons">
 <a href="#" class="easyui-linkbutton" iconCls="icon-ok" onclick="saveUser()">Save</a>
 <a href="#" class="easyui-linkbutton" iconCls="icon-cancel" onclick="javascript:$('#dlg').dialog('close')">Cancel</a>
</div>

This dialog box has been created without any javascript code.

Step 4: Create and edit users

When creating a user, open a dialog box and clear the form data.

function newUser(){
 $('#dlg').dialog('open').dialog('setTitle','New User');
 $('#fm').form('clear');
 url = 'save_user.php';
}

When editing a user, opens a dialog and loads form data from the selected rows in the datagrid.

var row = $('#dg').datagrid('getSelected');
if (row){
 $('#dlg').dialog('open').dialog('setTitle','Edit User');
 $('#fm').form('load',row);
 url = 'update_user.php?id='+row.id;
}

'url' stores the URL address that the form returns when saving user data.
Step 5: Save user data

We use the following code to save user data:

function saveUser(){
 $('#fm').form('submit',{
 url: url,
 onSubmit: function(){
 return $(this).form('validate');
 },
 success: function(result){
 var result = eval('('+result+')');
 if (result.errorMsg){
 $.messager.show({
 title: 'Error',
 msg: result.errorMsg
 });
 } else {
 $('#dlg').dialog('close'); // close the dialog
 $('#dg').datagrid('reload'); // reload the user data
 }
 }
 });
}

Before submitting the form, the 'onSubmit' function will be called, which is used to verify the form field values. When the form field value is submitted successfully, close the dialog box and reload the datagrid data.
Step 6: Delete a User

We use the following code to remove a user:

function destroyUser(){
 var row = $('#dg').datagrid('getSelected');
 if (row){
 $.messager.confirm('Confirm','Are you sure you want to destroy this user?',function(r){
 if (r){
 $.post('destroy_user.php',{id:row.id},function(result){
 if (result.success){
 $('#dg').datagrid('reload'); // reload the user data
 } else {
 $.messager.show({ // show error message
 title: 'Error',
 msg: result.errorMsg
 });
 }
 },'json');
 }
 });
 }
}

Before removing a row, we will display a confirmation dialog box to let the user decide whether to really remove the row of data. When the data is removed successfully, call the 'reload' method to refresh the datagrid data.
Step 7: Run the code

Open MySQL and run the code in the browser.

2. EasyUI creates a CRUD application that expands row details editing form

When switching the datagrid view to 'detailview', the user can expand a row to show some row details below the row. This feature allows you to provide some suitable layout for editing forms in the detail panel. In this tutorial, we use the datagrid component to reduce the space occupied by the edit form.

Step 1: Define the data grid (DataGrid) in HTML tags

<table id="dg" title="My Users" style="width:550px;height:250px"
 url="get_users.php"
 toolbar="#toolbar"
 fitColumns="true" singleSelect="true">
 <thead>
 <tr>
  <th field="firstname" width="50">First Name</th>
  <th field="lastname" width="50">Last Name</th>
  <th field="phone" width="50">Phone</th>
  <th field="email" width="50">Email</th>
 </tr>
 </thead>
</table>
<div id="toolbar">
 <a href="#" class="easyui-linkbutton" iconCls="icon-add" plain="true" onclick="newItem()">New</a>
 <a href="#" class="easyui-linkbutton" iconCls="icon-remove" plain="true" onclick="destroyItem()">Destroy</a>
</div>

Step 2: Apply detail view to the DataGrid

$('#dg').datagrid({
 view: detailview,
 detailFormatter:function(index,row){
 return '<div class="ddv"></div>';
 },
 onExpandRow: function(index,row){
 var ddv = $(this).datagrid('getRowDetail',index).find('div.ddv');
 ddv.panel({
  border:false,
  cache:true,
  href:'show_form.php&#63;index='+index,
  onLoad:function(){
  $('#dg').datagrid('fixDetailRowHeight',index);
  $('#dg').datagrid('selectRow',index);
  $('#dg').datagrid('getRowDetail',index).find('form').form('load',row);
  }
 });
 $('#dg').datagrid('fixDetailRowHeight',index);
 }
});

为了为数据网格（DataGrid）应用明细视图，在 html 页面头部引入 'datagrid-detailview.js' 文件。
我们使用 'detailFormatter' 函数来生成行明细内容。 在这种情况下，我们返回一个用于放置编辑表单（form）的空的

。 当用户点击行展开按钮（'+'）时，'onExpandRow' 事件将被触发，我们将通过 ajax 加载编辑表单（form）。 调用 'getRowDetail' 方法来得到行明细容器，所以我们能查找到行明细面板（panel）。 在行明细中创建面板（panel），加载从 'show_form.php' 返回的编辑表单（form）。
步骤 3：创建编辑表单（Form）

编辑表单（form）是从服务器加载的。
show_form.php

<form method="post">
 <table class="dv-table" style="width:100%;background:#fafafa;padding:5px;margin-top:5px;">
 <tr>
  <td>First Name</td>
  <td><input name="firstname" class="easyui-validatebox" required="true"></input></td>
  <td>Last Name</td>
  <td><input name="lastname" class="easyui-validatebox" required="true"></input></td>
 </tr>
 <tr>
  <td>Phone</td>
  <td><input name="phone"></input></td>
  <td>Email</td>
  <td><input name="email" class="easyui-validatebox" validType="email"></input></td>
 </tr>
 </table>
 <div style="padding:5px 0;text-align:right;padding-right:30px">
 <a href="#" class="easyui-linkbutton" iconCls="icon-save" plain="true" onclick="saveItem(<&#63;php echo $_REQUEST['index'];&#63;>)">Save</a>
 <a href="#" class="easyui-linkbutton" iconCls="icon-cancel" plain="true" onclick="cancelItem(<&#63;php echo $_REQUEST['index'];&#63;>)">Cancel</a>
 </div>
</form>

步骤 4：保存或取消编辑

调用 'saveItem' 函数来保存一个用户或者调用 'cancelItem' 函数来取消编辑。

function saveItem(index){
 var row = $('#dg').datagrid('getRows')[index];
 var url = row.isNewRecord ? 'save_user.php' : 'update_user.php?id='+row.id;
 $('#dg').datagrid('getRowDetail',index).find('form').form('submit',{
 url: url,
 onSubmit: function(){
  return $(this).form('validate');
 },
 success: function(data){
  data = eval('('+data+')');
  data.isNewRecord = false;
  $('#dg').datagrid('collapseRow',index);
  $('#dg').datagrid('updateRow',{
  index: index,
  row: data
  });
 }
 });
}

决定要回传哪一个 URL，然后查找表单（form）对象，并调用 'submit' 方法来提交表单（form）数据。当保存数据成功时，折叠并更新行数据。

function cancelItem(index){
 var row = $('#dg').datagrid('getRows')[index];
 if (row.isNewRecord){
 $('#dg').datagrid('deleteRow',index);
 } else {
 $('#dg').datagrid('collapseRow',index);
 }
}

当取消编辑动作时，如果该行是新行而且还没有保存，直接删除该行，否则折叠该行。

以上就是关于EasyUI创建CRUD应用的七大步骤，分享给大家，希望对大家的学习有所帮助。

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