我试图在$ root.questions.editQuestionDialog.question（）。canBeDeleted为true时启用一些按钮。这仅在某些情况下有效。对于文件末尾的按钮，即使我检查该属性时将其设置为true，表达式也始终为false。
<div id="headerContent" style="display: none" data-bind="visible: menu.isMenuActive('Questions')">
<fieldset data-bind="with: questions">
<legend>Questions <span data-bind="text: headerName"></span></legend>
<div class="alert alert-info" data-bind="visible: $parent.blockId == 0">
You must save before you can add questions
</div>
<div data-bind="visible: $parent.blockId > 0">
<button class="btn btn-info" data-bind="click: addQuestion, enable:writeEnabled">Add Question</button>
<div class="control-group">
<div data-bind="sortable: {data:groups, beforeMove:$root.questions.allowGroupDrop, afterMove : $root.questions.saveGroupOrder}" class="pointer">
<div>
<h1><i class="icon-move topMargin10"></i> <span data-bind="text:number() + '. ' + name()"></span></h1>
<div data-bind="if:questions">
<table >
<tbody data-bind="sortable: {data:questions, afterMove : $root.questions.saveOrder, beforeMove: $root.questions.allowQuestionDrop, options : {handle : '.sortableHandle', cursor: 'move'} }">
<tr class="items">
<td class="sortableHandle moveCursor" width="770px" >
<!-- <label data-bind="text: ko.toJSON($data, null, 2)"></label> -->
<i class="icon-move"></i>
<span data-bind="style: { textDecoration:disabled() ? 'line-through' : 'normal' }, click:$root.questions.editQuestion, text: $parentContext.$index()+1 + '.' + (order()+1) + '. ' + shortText()"></span>
<button class="btn btn-danger btn-mini right" style="float:right; width:48px; text-align: center;"
data-bind="visible:$data.canBeDeleted() && $root.questions.writeEnabled, click: $root.questions.deleteQuestion">Delete</button>
<button class="btn btn-warning btn-mini right" style="float:right; width:48px; text-align: center;"
data-bind="visible:$data.canBeDisabled() && $root.questions.writeEnabled, click: $root.questions.disableQuestion">Disable</button>
<button class="btn btn-success btn-mini right" style="float:right; width:48px; text-align: center;"
data-bind="visible:$data.canBePublished() && $root.questions.writeEnabled, click: $root.questions.publishQuestion">Publish </button>
<!-- ko foreach:options-->
<div class="left" style="margin-left:50px;margin-top:2px" data-bind="if:subQuestion.text">
<i class="icon-angle-right"></i> <span data-bind="text: subQuestion.text()"></span>
</div>
<!-- /ko-->
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</fieldset>
<div class="hidden" data-bind="jqdialog : {title : $root.questions.editQuestionDialog.questionIsDisabled() || !$root.questions.writeEnabled() ? 'View Question' : 'Edit Question', trigger: questions.editQuestionDialog.isOpen, options: {width:880, position: ['center',180]}}">
<div class="control-group" data-bind="if: $root.questions.editQuestionDialog.question">
<form style="padding-bottom: 15px;">
<div data-bind="if: $root.questions.editQuestionDialog.question">
<div class="control-group" data-bind="with:questions, visible: $root.questions.editQuestionDialog.question().parentOption == null ">
<div class="controls-row">
<label class="span10 wellLabel">Question Group</label>
</div>
<div class="controls controls-row">
<table>
<tr>
<td>
<select data-bind="visible: (!editQuestionDialog.addGroupIsActive() && !editQuestionDialog.questionIsDisabled()) , value : editQuestionDialog.question().questionGroupId,
options: groups,
optionsText: 'name',
optionsValue : 'id'"></select>
<input type="text" data-bind="visible:editQuestionDialog.addGroupIsActive() && !editQuestionDialog.questionIsDisabled(), textInput:editQuestionDialog.newGroupName, hasFocus:editQuestionDialog.addGroupHasFocus, event: { keyup: editQuestionDialog.inputnewGroupkeyUp }" />
<input type="text" disabled data-bind="visible:!editQuestionDialog.addGroupIsActive() && editQuestionDialog.questionIsDisabled(), value:editQuestionDialog.groupName()" />
</td>
<td>
<label class="btn btn-info" data-bind="visible: !editQuestionDialog.addGroupIsActive() && !editQuestionDialog.questionIsDisabled() , click:editQuestionDialog.addGroup" type="button">Add new group</label>
<label class="btn btn-primary" data-bind="visible:editQuestionDialog.addGroupIsActive , click:editQuestionDialog.saveGroup">Save Group</label>
<label class="btn btn-danger" data-bind="visible:editQuestionDialog.viewCancel, click:editQuestionDialog.closeAddGroup">Cancel</label>
</td>
</tr>
</table>
</div>
</div>
<div data-bind="visible:questions.editQuestionDialog.question().questionGroupId">
<div data-bind="if:questions.editQuestionDialog.question().parentOption">
<div class="well">
<span class="label label-info">Sub question</span>
<ul class="breadcrumb">
<li><a href="#" data-bind="click: questions.editQuestionDialog.openParentQuestion, text:questions.editQuestionDialog.question().parentOption.question.order()+1 + '. ' + questions.editQuestionDialog.question().parentOption.question.text() "></a></li>
<li>/</li>
<li> <span data-bind=" text:questions.editQuestionDialog.question().parentOption.text()"></span></li>
</ul>
</div>
</div>
<div class="controls controls-row">
<label class="span7 wellLabel">Question</label>
<label class="span3 wellLabel">Required</label>
</div>
<div class="controls controls-row">
<input type="text" id="editQuestiontext" class="input-medium span7" data-bind="textInput: $root.questions.editQuestionDialog.question().text, enable:!$root.questions.editQuestionDialog.questionIsDisabled() && $root.questions.editQuestionDialog.question().canBeDeleted" maxlength="300" />
<select class="span3" data-bind="enable:!$root.questions.editQuestionDialog.questionIsDisabled() && $root.questions.editQuestionDialog.question().canBeDeleted, options: $root.questions.editQuestionDialog.isCorrectOptions, optionsText: 'text', optionsValue: 'value', value:$root.questions.editQuestionDialog.question().isRequired"></select>
</div>
<div class="controls controls-row">
<label class="span10 wellLabel">Type of question</label>
</div>
<div class="controls-row" data-bind="disable:$root.questions.editQuestionDialog.questionIsDisabled()">
<div id=questionTypeChoice class="btn-group" data-bind="with:$root.questions.editQuestionDialog">
<button class="btn" type="button" data-bind="click:function(){setQuestionType(2);}, css :{'btn-primary' :question().type() == 2}">Yes/No</button>
<button class="btn" type="button" data-bind="click:function(){setQuestionType(1);},css :{'btn-primary' : question().type() == 1}">Free text</button>
<button class="btn" type="button" data-bind="click:function(){setQuestionType(3);},css :{'btn-primary' : question().type() == 3}">Single choice</button>
<button class="btn" type="button" data-bind="click:function(){setQuestionType(4);},css :{'btn-primary' : question().type() == 4}">Multi choice</button>
</div>
</div>
</div>
<div data-bind="visible: $root.questions.editQuestionDialog.showOptions">
<div class="controls controls-row">
<label class="wellLabel span10">Options</label>
</div>
<div class="controls controls-row">
<table class="table">
<thead>
<tr class="primary">
<th>Text</th>
<th>Is correct</th>
<th colspan="3">Points</th>
</tr>
</thead>
<tbody data-bind="visible: $root.questions.editQuestionDialog.question().type() > 2">
<tr class="success">
<td class="span4">
<input type="text" class="span5" data-bind="enable: !$root.questions.editQuestionDialog.questionIsDisabled() && $root.questions.editQuestionDialog.question().canBeDeleted, textInput:$root.questions.editQuestionDialog.newOption.text, hasFocus:$root.questions.editQuestionDialog.newOption.hasFocus" />
</td>
<td class="span2">
<select class="span1" data-bind="enable:!$root.questions.editQuestionDialog.questionIsDisabled() && $root.questions.editQuestionDialog.question().canBeDeleted, options: $root.questions.editQuestionDialog.isCorrectOptions, optionsText : 'text', optionsValue:'value', value :$root.questions.editQuestionDialog.newOption.isCorrect "></select>
</td>
<td class="span2">
<select class="span1" data-bind="enable:!$root.questions.editQuestionDialog.questionIsDisabled() && $root.questions.editQuestionDialog.question().canBeDeleted, options:$root.questions.editQuestionDialog.pointValues, value:$root.questions.editQuestionDialog.newOption.point"></select>
</td>
<td class="span2">
<button class="btn btn-primary" data-bind="visible: !$root.questions.editQuestionDialog.questionIsDisabled(), click: $root.questions.editQuestionDialog.addNewOption, enable:$root.questions.editQuestionDialog.newOption.text().length > 0">Add</button>
</td>
</tr>
</tbody>
<div disabled>
<tbody id="dataGrid" data-bind="foreach: $root.questions.editQuestionDialog.optionsForType">
<tr class="sortable-bulk moveCursor", draggable="true" data-bind="disable:$root.questions.editQuestionDialog.questionIsDisabled(), event:{drop: function(data,e) {$root.questions.editQuestionDialog.doOptionDrop(e,data);},
dragover:function(data,e) {$root.questions.editQuestionDialog.doAllowOptionDrop(e,data);},
dragleave:function(data,e) {$root.questions.editQuestionDialog.doDragOptionLeave(e,data);},
dragstart:function(data,e) {return $root.questions.editQuestionDialog.doOptionDrag(e,data);}}">
<td class="span4" >
<div>
<div>
<input id="optText" onclick="this.focus(); this.blur(); this.focus();" type="text" class="span5" data-bind="enable: !$root.questions.editQuestionDialog.questionIsDisabled() && $root.questions.editQuestionDialog.question().canBeDeleted, textInput:text"/></td>
</div>
</div>
<td class="span2">
<select class="span1" data-bind="enable: !$root.questions.editQuestionDialog.questionIsDisabled() && $root.questions.editQuestionDialog.question().canBeDeleted, options: $root.questions.editQuestionDialog.isCorrectOptions, optionsText : 'text', optionsValue:'value', value :isCorrect, event : {change : $root.questions.editQuestionDialog.isCorrectHasChanged}"></select>
</td>
<td class="span2">
<select class="span1" data-bind="enable: !$root.questions.editQuestionDialog.questionIsDisabled() && $root.questions.editQuestionDialog.question().canBeDeleted, options:$root.questions.editQuestionDialog.pointValues, value:point"></select>
</td>
<td class="span4">
<button class="btn btn-danger" data-bind="click: $root.questions.editQuestionDialog.removeOption, visible: $root.questions.editQuestionDialog.question().type() > 2 && !$root.questions.editQuestionDialog.questionIsDisabled()">Remove</button>
<button class="btn btn-info" data-bind="visible : $root.questions.editQuestionDialog.question().parentOption == null && $root.questions.editQuestionDialog.question().type() != 4 && !$root.questions.editQuestionDialog.questionIsDisabled(), click: $root.questions.editQuestionDialog.addSubQuestion, text: subQuestion.text() != null ? 'Edit sub question' : 'Create sub' ">Sub question</button>
<button class="btn btn-info" data-bind="visible : $root.questions.editQuestionDialog.question().parentOption == null && $root.questions.editQuestionDialog.question().type() != 4 && $root.questions.editQuestionDialog.questionIsDisabled() && subQuestion.text() != null , click: $root.questions.editQuestionDialog.addSubQuestion, text: subQuestion.text() != null ? 'Show sub question' : null ">Sub question</button>
</td>
</tr>
</tbody>
</div>
</table>
</div>
</div>
</div>
</form>
</div>
<div>
<button style="margin: 0px 5px 0px 0px" class="btn pull-right" data-bind="click: questions.editQuestionDialog.close">Close</button>
<button style="margin: 0px 5px 0px 0px" class="btn btn-warning pull-right" data-bind="click: questions.editQuestionDialog.clearQuestion, enable: $root.questions.editQuestionDialog.question().canBeDeleted">Clear</button>
<button style="margin: 0px 5px 0px 0px" class="btn btn-info pull-right" data-bind="click: questions.editQuestionDialog.saveQuestion, enable:questions.editQuestionDialog.questionIsValid && $root.questions.editQuestionDialog.question().canBeDeleted">Save</button>
</div>
</div>
</div>
该代码是同一文件中的所有代码，该表达式可在所有其他位置使用，但文件底部的“保存”和“清除”按钮除外。可能是什么问题呢？您是否需要为数据绑定编写不同的表达式：可见和启用？
答案 0 :(得分：0)
我通过仅将表单内部的按钮向上移动几行来解决此问题。不太确定为什么会这样，但是我猜想它与绑定有关，就像有人说的那样。