使用 JSON 的 Jquery UI 自动完成功能不起作用

Question

大家好，我想弄清楚为什么当我在源代码末尾添加一个变量时，autocomplete() 方法没有执行GET。例如：

    <script> 
    $(document).ready(function(){
        var search_input;

        $('#search').keyup(function(){
            search_input = ($(this).val());
            console.log(search_input);
        });
        $('#search').autocomplete({
          source: "http://192.168.33.10/app_dev.php/search/query/" + search_input,
          minLength: 2
        });
    });
    </script>

    <div class="ui-widget">
        <label for="search">Search</label>
        <input type="text" id="search" />
    </div>   

但是，如果我从源中删除 + search_input，它将执行 GET，就像这样..

    <script> 
    $(document).ready(function(){
        var search_input;

        $('#search').keyup(function(){
            search_input = ($(this).val());
            console.log(search_input);
        });
        $('#search').autocomplete({
          source: "http://192.168.33.10/app_dev.php/search/query/",
          minLength: 2
        });
    });
    </script>

    <div class="ui-widget">
        <label for="search">Search</label>
        <input type="text" id="search" />
    </div>   

Answer 1

在您的代码中，autocomplete 函数只需要为 source 参数提供一个回调函数。 source: function( request, response ) {}

您可以按照Multiple remote suggestions on jQuery UI Autocomplete的示例进行操作

    <script type="text/javascript"> 
      $(function() {
    function split( val ) {
      return val.split( /,\s*/ );
    }
    function extractLast( term ) {
      return split( term ).pop();
    }

    $( "#search" )
      // don't navigate away from the field on tab when selecting an item
      .bind( "keydown", function( event ) {
        if ( event.keyCode === $.ui.keyCode.TAB &&
            $( this ).data( "ui-autocomplete" ).menu.active ) {
          event.preventDefault();
        }
      })
      .autocomplete({
        source: function( request, response ) {
          $.getJSON( "http://192.168.33.10/app_dev.php/search/query/" + extractLast( request.term ), {
            term: extractLast( request.term )
          }, response );
        },
        search: function() {
          // custom minLength
          var term = extractLast( this.value );
          if ( term.length < 2 ) {
            return false;
          }
        },
        focus: function() {
          // prevent value inserted on focus
          return false;
        },
        select: function( event, ui ) {
          var terms = split( this.value );
          // remove the current input
          terms.pop();
          // add the selected item
          terms.push( ui.item.value );
          // add placeholder to get the comma-and-space at the end
          terms.push( "" );
          this.value = terms.join( ", " );
          return false;
        }
      });
  });
        </script>

本例中服务器返回的 JSON 结构如下：

[{"id":"1544","label":"Suggestion 1","value":"Suggestion 1"},
{"id":"3321","label":"Suggestion 2","value":"Suggestion 2"}]

Answer 2

即使您正在更改search_input，小部件也只会获取初始值为search_input（可能为空）的URL。

你需要这样的东西：

$('#search').autocomplete({
    source: function (request, response) {
        $.get("http://192.168.33.10/app_dev.php/search/query/" + request.term, response)
    },
    minLength: 2
});