如何禁用jquery ui combobox？

禁用 jQuery UI Combobox 的方法

基础概念

jQuery UI Combobox 是一个基于 jQuery UI 的自定义下拉框控件，它结合了输入框和下拉列表的功能，提供了比原生 <select> 更丰富的交互体验。

禁用方法

有几种方法可以禁用 jQuery UI Combobox：

方法1：使用 disabled 属性

// 禁用 Combobox
$("#yourCombobox").combobox("option", "disabled", true);

// 启用 Combobox
$("#yourCombobox").combobox("option", "disabled", false);

方法2：通过原生 select 元素禁用

// 禁用
$("#yourCombobox").prop("disabled", true).combobox("refresh");

// 启用
$("#yourCombobox").prop("disabled", false).combobox("refresh");

方法3：添加 CSS 类

// 禁用
$("#yourCombobox").addClass("ui-state-disabled");

// 启用
$("#yourCombobox").removeClass("ui-state-disabled");

完整示例代码

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <style>
    .custom-combobox {
      position: relative;
      display: inline-block;
    }
    .custom-combobox-toggle {
      position: absolute;
      top: 0;
      bottom: 0;
      margin-left: -1px;
      padding: 0;
    }
    .custom-combobox-input {
      margin: 0;
      padding: 0.3em;
    }
    .ui-state-disabled {
      opacity: 0.6;
      cursor: not-allowed;
    }
  </style>
  <script>
  $(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({
            classes: {
              "ui-tooltip": "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;
        
        $("<button>")
          .attr("tabIndex", -1)
          .attr("title", "Show All Items")
          .appendTo(this.wrapper)
          .button({
            icons: {
              primary: "ui-icon-triangle-1-s"
            },
            text: false
          })
          .removeClass("ui-corner-all")
          .addClass("custom-combobox-toggle ui-corner-right")
          .on("mousedown", function() {
            wasOpen = input.autocomplete("widget").is(":visible");
          })
          .on("click", function() {
            input.trigger("focus");
            
            if (wasOpen) {
              return;
            }
            
            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) {
        if (ui.item) {
          return;
        }
        
        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;
          }
        });
        
        if (valid) {
          return;
        }
        
        this.input.val("");
        this.element.val("");
        this._trigger("change", event, {
          item: null
        });
      },
      
      _destroy: function() {
        this.wrapper.remove();
        this.element.show();
      }
    });
    
    $("#combobox").combobox();
    
    // 禁用按钮
    $("#disableBtn").click(function() {
      $("#combobox").combobox("option", "disabled", true);
    });
    
    // 启用按钮
    $("#enableBtn").click(function() {
      $("#combobox").combobox("option", "disabled", false);
    });
  });
  </script>
</head>
<body>
 
<div class="ui-widget">
  <label>Your preferred programming language: </label>
  <select id="combobox">
    <option value="">Select one...</option>
    <option value="JavaScript">JavaScript</option>
    <option value="Python">Python</option>
    <option value="Java">Java</option>
    <option value="C#">C#</option>
    <option value="PHP">PHP</option>
  </select>
  
  <button id="disableBtn">禁用 Combobox</button>
  <button id="enableBtn">启用 Combobox</button>
</div>
 
</body>
</html>