将焦点设置在 C# 后面代码中的 Jquery 自动完成下拉列表中

Question

我正在使用Jquery自动完成组合框作为我的下拉列表。 我在这里的问题是，一旦我从背后的代码设置焦点，它就不会反映在客户端。

<asp:DropDownList runat="server" CssClass="Dropdown" ID="ddl"></asp:DropDownList>

我用，

ddl.Focus();

我的 Jquery 在这里，

    (function( $ ) {
    $.widget( "custom.combobox", {
      _create: function() {
        this.wrapper = $( "<span>" )
          .addClass( "custom-combobox" )
          .insertAfter( this.element );
        this.element.hide();
        this._createAutocomplete();
        this._createShowAllButton();
      },
      _createAutocomplete: function() {
        var selected = this.element.children( ":selected" ),
          value = selected.val() ? selected.text() : "";
        this.input = $( "<input>" )
          .appendTo( this.wrapper )
          .val( value )
          .attr( "title", "" )
          .addClass( "custom-combobox-input ui-widget ui-widget-content ui-state-default ui-corner-left" )
          .autocomplete({
            delay: 0,
            minLength: 0,
            source: $.proxy( this, "_source" )
          })
          .tooltip({
            tooltipClass: "ui-state-highlight"
          });
        this._on( this.input, {
          autocompleteselect: function( event, ui ) {
            ui.item.option.selected = true;
            this._trigger( "select", event, {
              item: ui.item.option
            });
          },
          autocompletechange: "_removeIfInvalid"
        });
      },
      _createShowAllButton: function() {
        var input = this.input,
          wasOpen = false;
        $( "<a>" )
          .attr( "tabIndex", -1 )
          .attr( "title", "Show All Items" )
          .tooltip()
          .appendTo( this.wrapper )
          .button({
            icons: {
              primary: "ui-icon-triangle-1-s"
            },
            text: false
          })
          .removeClass( "ui-corner-all" )
          .addClass( "custom-combobox-toggle ui-corner-right" )
          .mousedown(function() {
            wasOpen = input.autocomplete( "widget" ).is( ":visible" );
          })
          .click(function() {
            input.focus();
            // Close if already visible
            if ( wasOpen ) {
              return;
            }
            // Pass empty string as value to search for, displaying all results
            input.autocomplete( "search", "" );
          });
      },
      _source: function( request, response ) {
        var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
        response( this.element.children( "option" ).map(function() {
          var text = $( this ).text();
          if ( this.value && ( !request.term || matcher.test(text) ) )
            return {
              label: text,
              value: text,
              option: this
            };
        }) );
      },
      _removeIfInvalid: function( event, ui ) {
        // Selected an item, nothing to do
        if ( ui.item ) {
          return;
        }
        // Search for a match (case-insensitive)
        var value = this.input.val(),
          valueLowerCase = value.toLowerCase(),
          valid = false;
        this.element.children( "option" ).each(function() {
          if ( $( this ).text().toLowerCase() === valueLowerCase ) {
            this.selected = valid = true;
            return false;
          }
        });
        // Found a match, nothing to do
        if ( valid ) {
          return;
        }
        // Remove invalid value
        this.input
          .val( "" )
          .attr( "title", value + " didn't match any item" )
          .tooltip( "open" );
        this.element.val( "" );
        this._delay(function() {
          this.input.tooltip( "close" ).attr( "title", "" );
        }, 2500 );
        this.input.data( "ui-autocomplete" ).term = "";
      },
      _destroy: function() {
        this.wrapper.remove();
        this.element.show();
      }
    });
  })( jQuery );

我知道 Jquery 为 asp.net 下拉列表创建了自己的输入和愤怒标签。因此，实际的 asp.net 下拉列表将无法控制其 ID。

Answer 1

将所选选项保存在代码本节的隐藏字段中，如下所示。curListValue 是您的隐藏字段。

           this._on( this.input, {
      autocompleteselect: function( event, ui ) {
        ui.item.option.selected = true;
        this._trigger( "select", event, {
          item: ui.item.option //save this in a hidden field
        });
              var selectedVaue=ui.item.option.id;
             var $('[id*=curListValue]').val(selectedVaue);
           },

.....并在您的页面上加载标记中的函数

 function pageLoad(sender, args) {
                { 
         if(args._isPartialLoad)
           {
               var selectedValue=$('[id*=curListValue]').val();
             $('.ui-autocomplete-input').focus().val(selectedValue);
           }
         }