jQuery DataTables - 在 AJAX 调用后强制显示空表消息

Question

我有一个jquery-datatables 设置，并使用作为标准关键字过滤器的自定义搜索过滤器和一个使用ajax 调用来 ping 后端并返回值（如果有）的自定义项目 ID 搜索然后使用该值在特定列中搜索表。

$.ajax({
  url: 'the_url_to_lookup_itemID',
  data: {
    'engravingId': search(search is the value from the input field assigned to this variable)
  },
  dataType: 'jsonp',
  success: function(data) {
    console.log(data.assetId);
    var assetId = data.assetId;
    if (assetId != 0) {
      searchResults.columns(2).search(assetId).draw();
    } else {
      searchResults.search(assetId).draw();
    }
  }
});

如果assetId 等于"0"，则搜索只假定它是关键字，因为不存在assetId 的记录。但是没有清除表记录并没有显示任何结果，而是没有任何变化。我假设因为"0" 不足以让过滤器运行，那么我该如何强制它呢？我希望用户看到一些结果，"No matching records found" 或类似的东西。

在此自定义搜索未能产生任何结果后，如何强制我的 jquery-datatables 显示 "No matching records found"？

我不在没有结果时寻找自定义消息。我只是在寻找一种在执行 Ajax 调用时强制显示此 "No matching records found" 的方法，并且该函数不会产生任何结果。

Answer 1

强制显示"No matching records found" 消息的一种方法是使用clear() 和draw() 方法。

如果您需要在运行时更改消息，可以使用datatables.context[0].oLanguage.sEmptyTable 属性。

你的情况是：

searchResults.context[0].oLanguage.sEmptyTable = "No matching records found...";
searchResults.clear().draw();

类似这样的：

$(function() {
  var dataSet = [
    ["Tiger Nixon", "System Architect", "Edinburgh", "5421", "2011/04/25", "$320,800"],
    ["Garrett Winters", "Accountant", "Tokyo", "8422", "2011/07/25", "$170,750"],
    ["Ashton Cox", "Junior Technical Author", "San Francisco", "1562", "2009/01/12", "$86,000"],
    ["Cedric Kelly", "Senior Javascript Developer", "Edinburgh", "6224", "2012/03/29", "$433,060"],
    ["Airi Satou", "Accountant", "Tokyo", "5407", "2008/11/28", "$162,700"],
    ["Brielle Williamson", "Integration Specialist", "New York", "4804", "2012/12/02", "$372,000"],
    ["Herrod Chandler", "Sales Assistant", "San Francisco", "9608", "2012/08/06", "$137,500"],
    ["Rhona Davidson", "Integration Specialist", "Tokyo", "6200", "2010/10/14", "$327,900"],
    ["Colleen Hurst", "Javascript Developer", "San Francisco", "2360", "2009/09/15", "$205,500"],
    ["Sonya Frost", "Software Engineer", "Edinburgh", "1667", "2008/12/13", "$103,600"],
    ["Jena Gaines", "Office Manager", "London", "3814", "2008/12/19", "$90,560"],
    ["Quinn Flynn", "Support Lead", "Edinburgh", "9497", "2013/03/03", "$342,000"],
    ["Charde Marshall", "Regional Director", "San Francisco", "6741", "2008/10/16", "$470,600"],
    ["Haley Kennedy", "Senior Marketing Designer", "London", "3597", "2012/12/18", "$313,500"],
    ["Tatyana Fitzpatrick", "Regional Director", "London", "1965", "2010/03/17", "$385,750"],
    ["Michael Silva", "Marketing Designer", "London", "1581", "2012/11/27", "$198,500"],
    ["Paul Byrd", "Chief Financial Officer (CFO)", "New York", "3059", "2010/06/09", "$725,000"],
    ["Gloria Little", "Systems Administrator", "New York", "1721", "2009/04/10", "$237,500"],
    ["Bradley Greer", "Software Engineer", "London", "2558", "2012/10/13", "$132,000"],
    ["Dai Rios", "Personnel Lead", "Edinburgh", "2290", "2012/09/26", "$217,500"],
    ["Jenette Caldwell", "Development Lead", "New York", "1937", "2011/09/03", "$345,000"],
    ["Yuri Berry", "Chief Marketing Officer (CMO)", "New York", "6154", "2009/06/25", "$675,000"],
    ["Caesar Vance", "Pre-Sales Support", "New York", "8330", "2011/12/12", "$106,450"],
    ["Doris Wilder", "Sales Assistant", "Sidney", "3023", "2010/09/20", "$85,600"],
    ["Angelica Ramos", "Chief Executive Officer (CEO)", "London", "5797", "2009/10/09", "$1,200,000"],
    ["Gavin Joyce", "Developer", "Edinburgh", "8822", "2010/12/22", "$92,575"],
    ["Jennifer Chang", "Regional Director", "Singapore", "9239", "2010/11/14", "$357,650"],
    ["Brenden Wagner", "Software Engineer", "San Francisco", "1314", "2011/06/07", "$206,850"],
    ["Fiona Green", "Chief Operating Officer (COO)", "San Francisco", "2947", "2010/03/11", "$850,000"],
    ["Shou Itou", "Regional Marketing", "Tokyo", "8899", "2011/08/14", "$163,000"],
    ["Michelle House", "Integration Specialist", "Sidney", "2769", "2011/06/02", "$95,400"],
    ["Suki Burks", "Developer", "London", "6832", "2009/10/22", "$114,500"],
    ["Prescott Bartlett", "Technical Author", "London", "3606", "2011/05/07", "$145,000"],
    ["Gavin Cortez", "Team Leader", "San Francisco", "2860", "2008/10/26", "$235,500"],
    ["Martena Mccray", "Post-Sales support", "Edinburgh", "8240", "2011/03/09", "$324,050"],
    ["Unity Butler", "Marketing Designer", "San Francisco", "5384", "2009/12/09", "$85,675"]
  ];

  var columnDefs = [{
    title: "Name"
  }, {
    title: "Position"
  }, {
    title: "Office"
  }, {
    title: "Extn."
  }, {
    title: "Start date"
  }, {
    title: "Salary"
  }];

  var searchResults;

  searchResults = $('#example').DataTable({
    "sPaginationType": "full_numbers",
    data: dataSet,
    columns: columnDefs,
    dom: 'Bfrtip', // Needs button container
    select: 'single',
    responsive: true,
    buttons: []
  });

  // Setting the required behaviour to this question.
  document.getElementById("btnSetEmptyResults").onclick = function() {
    searchResults.context[0].oLanguage.sEmptyTable = "No matching records found...";
    searchResults.clear().draw();
  };
});

table.dataTable tbody>tr.selected,
table.dataTable tbody>tr>.selected {
  background-color: #A2D3F6;
}

<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/responsive/2.0.2/css/responsive.dataTables.min.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/1.10.11/css/jquery.dataTables.min.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/buttons/1.1.2/css/buttons.dataTables.min.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/select/1.1.2/css/select.dataTables.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/1.10.11/js/jquery.dataTables.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/buttons/1.1.2/js/dataTables.buttons.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/select/1.1.2/js/dataTables.select.min.js"></script>
<script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/responsive/2.0.2/js/dataTables.responsive.min.js"></script>
<div class="container">
  <button id="btnSetEmptyResults" class="dt-button" type="button">
    Set empty results
  </button>
  <table cellpadding="0" cellspacing="0" border="0" class="dataTable table table-striped" id="example">
  </table>
</div>

更新：

如果您需要打印回所有数据，则需要使用rows.add(data) 方法，其中data 参数是您最初在datatable 插件中用于打印的先前数据。然后再次使用.draw()方法渲染表格：

searchResults.rows.add(assetId).draw();

在此演示中： 2秒后将在清理datatable后打印回表中的所有数据。

$(function() {
  var dataSet = [
    ["Tiger Nixon", "System Architect", "Edinburgh", "5421", "2011/04/25", "$320,800"],
    ["Garrett Winters", "Accountant", "Tokyo", "8422", "2011/07/25", "$170,750"],
    ["Ashton Cox", "Junior Technical Author", "San Francisco", "1562", "2009/01/12", "$86,000"],
    ["Cedric Kelly", "Senior Javascript Developer", "Edinburgh", "6224", "2012/03/29", "$433,060"],
    ["Airi Satou", "Accountant", "Tokyo", "5407", "2008/11/28", "$162,700"],
    ["Brielle Williamson", "Integration Specialist", "New York", "4804", "2012/12/02", "$372,000"],
    ["Herrod Chandler", "Sales Assistant", "San Francisco", "9608", "2012/08/06", "$137,500"],
    ["Rhona Davidson", "Integration Specialist", "Tokyo", "6200", "2010/10/14", "$327,900"],
    ["Colleen Hurst", "Javascript Developer", "San Francisco", "2360", "2009/09/15", "$205,500"],
    ["Sonya Frost", "Software Engineer", "Edinburgh", "1667", "2008/12/13", "$103,600"],
    ["Jena Gaines", "Office Manager", "London", "3814", "2008/12/19", "$90,560"],
    ["Quinn Flynn", "Support Lead", "Edinburgh", "9497", "2013/03/03", "$342,000"],
    ["Charde Marshall", "Regional Director", "San Francisco", "6741", "2008/10/16", "$470,600"],
    ["Haley Kennedy", "Senior Marketing Designer", "London", "3597", "2012/12/18", "$313,500"],
    ["Tatyana Fitzpatrick", "Regional Director", "London", "1965", "2010/03/17", "$385,750"],
    ["Michael Silva", "Marketing Designer", "London", "1581", "2012/11/27", "$198,500"],
    ["Paul Byrd", "Chief Financial Officer (CFO)", "New York", "3059", "2010/06/09", "$725,000"],
    ["Gloria Little", "Systems Administrator", "New York", "1721", "2009/04/10", "$237,500"],
    ["Bradley Greer", "Software Engineer", "London", "2558", "2012/10/13", "$132,000"],
    ["Dai Rios", "Personnel Lead", "Edinburgh", "2290", "2012/09/26", "$217,500"],
    ["Jenette Caldwell", "Development Lead", "New York", "1937", "2011/09/03", "$345,000"],
    ["Yuri Berry", "Chief Marketing Officer (CMO)", "New York", "6154", "2009/06/25", "$675,000"],
    ["Caesar Vance", "Pre-Sales Support", "New York", "8330", "2011/12/12", "$106,450"],
    ["Doris Wilder", "Sales Assistant", "Sidney", "3023", "2010/09/20", "$85,600"],
    ["Angelica Ramos", "Chief Executive Officer (CEO)", "London", "5797", "2009/10/09", "$1,200,000"],
    ["Gavin Joyce", "Developer", "Edinburgh", "8822", "2010/12/22", "$92,575"],
    ["Jennifer Chang", "Regional Director", "Singapore", "9239", "2010/11/14", "$357,650"],
    ["Brenden Wagner", "Software Engineer", "San Francisco", "1314", "2011/06/07", "$206,850"],
    ["Fiona Green", "Chief Operating Officer (COO)", "San Francisco", "2947", "2010/03/11", "$850,000"],
    ["Shou Itou", "Regional Marketing", "Tokyo", "8899", "2011/08/14", "$163,000"],
    ["Michelle House", "Integration Specialist", "Sidney", "2769", "2011/06/02", "$95,400"],
    ["Suki Burks", "Developer", "London", "6832", "2009/10/22", "$114,500"],
    ["Prescott Bartlett", "Technical Author", "London", "3606", "2011/05/07", "$145,000"],
    ["Gavin Cortez", "Team Leader", "San Francisco", "2860", "2008/10/26", "$235,500"],
    ["Martena Mccray", "Post-Sales support", "Edinburgh", "8240", "2011/03/09", "$324,050"],
    ["Unity Butler", "Marketing Designer", "San Francisco", "5384", "2009/12/09", "$85,675"]
  ];

  var columnDefs = [{
    title: "Name"
  }, {
    title: "Position"
  }, {
    title: "Office"
  }, {
    title: "Extn."
  }, {
    title: "Start date"
  }, {
    title: "Salary"
  }];

  var searchResults;

  searchResults = $('#example').DataTable({
    "sPaginationType": "full_numbers",
    data: dataSet,
    columns: columnDefs,
    dom: 'Bfrtip', // Needs button container
    select: 'single',
    responsive: true,
    buttons: []
  });

  // Setting the required behaviour to this question.
  document.getElementById("btnSetEmptyResults").onclick = function() {
    searchResults.context[0].oLanguage.sEmptyTable = "No matching records found...";
    searchResults.clear().draw();

    // Get back all the data after 2 seconds.
    setTimeout(function() {
      searchResults.rows.add(dataSet).draw();
    }, 2000);
  };
});

table.dataTable tbody>tr.selected,
table.dataTable tbody>tr>.selected {
  background-color: #A2D3F6;
}

<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/responsive/2.0.2/css/responsive.dataTables.min.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/1.10.11/css/jquery.dataTables.min.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/buttons/1.1.2/css/buttons.dataTables.min.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/select/1.1.2/css/select.dataTables.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/1.10.11/js/jquery.dataTables.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/buttons/1.1.2/js/dataTables.buttons.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/select/1.1.2/js/dataTables.select.min.js"></script>
<script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/responsive/2.0.2/js/dataTables.responsive.min.js"></script>
<div class="container">
  <button id="btnSetEmptyResults" class="dt-button" type="button">
    Set empty results
  </button>
  <table cellpadding="0" cellspacing="0" border="0" class="dataTable table table-striped" id="example">
  </table>
</div>