在jQuery对话框中敲除了'with' binding和select2-Java 学习之路

Problem:

当在嵌套在使用knockout with 数据绑定的元素下的jQuery对话框上使用时，select2 jQuery插件不起作用 . 删除 with 绑定，select2工作正常 . 如果 with 绑定到嵌套属性，则它将停止工作 .

Background:

因此，我必须在3小时内努力争取让select2在jQuery对话框表单上工作....讨论关于这个谚语错误树的问题，我认为它纯粹是jQuery对话框和select2 . 它可能从一开始就使用 _allowInteraction 修复 . 直到我把问题直接解决为简单的步骤，并且因为开始显露自己 . 问题在于 with 绑定 .

Disclaimer

当我为阻止jsFiddle的asinine公司工作时道歉 . 此外，由于实际模型非常大，我为了说明目的而细分了我的实现 .

// models

function Department() {
  this.name         = ko.observable('dept1');
  this.selectedTeam = ko.observable( new Team() );
}
    
function Team() {
  this.name = ko.observable('team1');
}
    
function MainModel() {
  this.department = new Department();
  this.showTeam   = function() { 
    $('#addTeamDialog').dialog('open');
  };
}

// setup

ko.applyBindings( new MainModel() );
    	
$('#addTeamDialog').dialog({
  // fix allow select2 to work on the jq dialog
  _allowInteraction: function (event) {
    return !!$(event.target).is(".select2-input") || this._super(event);
  }		
});
    	
$('#someList').select2({
  data: [
    { id: 0, text: 'enhancement' },
    { id: 1, text: 'bug' },
    { id: 2, text: 'duplicate' },
    { id: 3, text: 'invalid' },
    { id: 4, text: 'wontfix' }
  ]
});

<link href="http://code.jquery.com/ui/1.11.4/themes/ui-lightness/jquery-ui.css" rel="stylesheet"/>
<link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.min.css" rel="stylesheet" />

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.full.min.js"></script>

<button data-bind="click: showTeam">Add Team</button>

<div id="addTeamDialog">
  <fieldset data-bind="with: department">
    
    <div class="lite-dialog-field">
      <div class="label">
        <span data-bind="text: name"></span>
      </div>
      <div class="field">
        <input type="hidden" id="someList" />
      </div>    
    </div>
        
  </fieldset>
</div>

删除 fieldset 上的 data-bind 和select2工作正常 .

当 fieldset 上的 data-bind 设置为 department 时，select2正常工作 .

当 fieldset 上的 data-bind 设置为 department.selectedTeam 时，select2不起作用 .

1 回答

使用Knockout时，强烈建议在绑定中包装select2等外部库 . 虽然您只初始化它们一次，但是 with ， template 或 foreach 等绑定可以在此之后的任何时间修改DOM .

你也面临着危险

当Knockout尚未渲染任何内容时，

过早地初始化select2，或者
淘汰并在稍后重新渲染标记，以便你的select2突然不再被绑定

例如，更改 Department.selectedTeam 时会发生这种情况 .

我've found a quick and dirty select2 binding from Knockouts' rniemeyer himself here . 除此之外，为了一致性和安全性，我只将select2标记更改为标准 <select> 并将 MainModel.department 变为适当的可观察对象 .

ko.bindingHandlers.select2 = {
    init: function(element, valueAccessor) {
      var options = ko.toJS(valueAccessor()) || {};
      setTimeout(function() { 
          $(element).select2(options);
      }, 0);
    }
};

// models

function Department() {
  this.name         = ko.observable('dept1');
  this.selectedTeam = ko.observable( new Team() );
};
    
function Team() {
  this.name     = ko.observable('team1');
  this.values   = ["red", "grey", "blue"];
  this.selected = ko.observableArray(["blue"]);
};
    
function MainModel() {
  this.department = ko.observable( new Department() );
  this.showTeam   = function() { 
    $('#addTeamDialog').dialog('open');
  };
};

// setup

ko.applyBindings( new MainModel() );
    	
$('#addTeamDialog').dialog({
  // fix allow select2 to work on the jq dialog
  _allowInteraction: function (event) {
    return !!$(event.target).is(".select2-input") || this._super(event);
  }		
});

select {
  width: 200px;
}

<link href="http://code.jquery.com/ui/1.11.4/themes/ui-lightness/jquery-ui.css" rel="stylesheet"/>
<link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.full.min.js"></script>

<button data-bind="click: showTeam">Add Team</button>

<div id="addTeamDialog">
  <fieldset data-bind="with: department().selectedTeam">
    
    <select data-bind="options: values,
                       selectedOptions: selected, 
                       select2: { placeholder: 'pick some colors' }">
    </select>
        
  </fieldset>
</div>

回复于 2024-04-19T12:33:06+08:00

在jQuery对话框中敲除了'with' binding和select2

1 回答

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