blocks|key|2632233|text|在不能使用ng类时，我使用以下条件设置类attr+(例如，在设置SVG样式时)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2632234|ng-attr-class="{{someBoolean+&&+'class-when-true'+%7C%7C+'class-when-false'+}}"|code-block|syntax|javascript|2632235|同样的方法也适用于其他属性类型。|2632236|(我认为你需要在最新的不稳定角度使用ng-attr-，我目前在1.1.4)|2632237|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>I am using the following to conditionally set the class attr when ng-class can't be used (for example when styling SVG):</p>

<pre><code>ng-attr-class="{{someBoolean &amp;&amp; 'class-when-true' || 'class-when-false' }}"
</code></pre>

<p>The same approach should work for other attribute types.</p>

<p>(I think you need to be on latest unstable Angular to use ng-attr-, I'm currently on 1.1.4)</p>


blocks|key|2632262|text|在最新版本的角(1.1.5)中，它们包含了一个称为ngIf的条件指令。它不同于ngShow和ngHide，因为元素不隐藏，但根本不包含在DOM中。对于创建成本很高但没有使用的组件，它们非常有用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2632263|<h1+ng-if="editMode"+contenteditable=true>{{content.title}}</h1>|code-block|syntax|javascript|2632264|entityMap^0|P|4|13|6|1A|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

<p>In the latest version of Angular (1.1.5), they have included a conditional directive called <code>ngIf</code>.  It is different from <code>ngShow</code> and <code>ngHide</code> in that the elements aren't hidden, but not included in the DOM at all.  They are very useful for components which are costly to create but aren't used:</p>

<pre><code>&lt;h1 ng-if="editMode" contenteditable=true&gt;{{content.title}}&lt;/h1&gt;
</code></pre>


blocks|key|2632274|text|几个月前，我写了一个补丁来做这件事(在freenode上的#angularjs中有人问过这个问题后)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2632275|它可能不会被合并，但它非常类似于ngClass：https://github.com/angular/angular.js/pull/4269|offset|length|2632276|不管合并与否，现有的ng-attr-*组件可能适合您的需求(正如其他人所提到的)，尽管它可能比您建议的ngClass风格的功能更笨重。|2632277|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/angular/angular.js/pull/4269^0|0|O|1B|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

<p>I actually wrote a patch to do this a few months ago (after someone asked about it in #angularjs on freenode).</p>

<p>It probably won't be merged, but it's very similar to ngClass: <a href="https://github.com/angular/angular.js/pull/4269" rel="noreferrer">https://github.com/angular/angular.js/pull/4269</a></p>

<p>Whether it gets merged or not, the existing ng-attr-* stuff is probably suitable for your needs (as others have mentioned), although it might be a bit clunkier than the more ngClass-style functionality that you're suggesting.</p>


blocks|key|1842992|text|对于已接受的解决方案(由Ashley发布的解决方案)，所描述的方法仍然在DOM中打印属性，而不考虑分配给它的值是未定义的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1842993|例如，在具有ng模型和value属性的输入字段设置上：|1842994|<input+type="text"+name="myInput"+data-ng-attr-value="{{myValue}}"+data-ng-model="myModel"+/>|code-block|syntax|javascript|1842995|不管myValue后面是什么，值属性仍然会在DOM中被打印，从而解释。吴模型就会被推翻。|offset|length|style|BOLD|1842996|有点不愉快，但使用ng-if的诀窍是：|1842997|<input+type="text"+name="myInput"+data-ng-if="value"+data-ng-attr-value="{{myValue}}"+data-ng-model="myModel"+/>
<input+type="text"+name="myInput"+data-ng-if="!value"+data-ng-model="myModel"+/>|1842998|我建议在ng-if指令中使用更详细的检查:)|1842999|entityMap^0|0|0|0|F|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$K|10|L|11|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

<p>Regarding the accepted solution, the one posted by Ashley Davis, the method described still prints the attribute in the DOM, regardless of the fact that the value it has been assigned is undefined.</p>

<p>For example, on an input field setup with both an ng-model and a value attribute:</p>

<pre><code>&lt;input type="text" name="myInput" data-ng-attr-value="{{myValue}}" data-ng-model="myModel" /&gt;
</code></pre>

<p>Regardless of what's behind myValue, the <strong>value</strong> attribute still gets printed in the DOM, thus, interpreted. Ng-model then, becomes overridden.</p>

<p>A bit unpleasant, but using ng-if does the trick:</p>

<pre><code>&lt;input type="text" name="myInput" data-ng-if="value" data-ng-attr-value="{{myValue}}" data-ng-model="myModel" /&gt;
&lt;input type="text" name="myInput" data-ng-if="!value" data-ng-model="myModel" /&gt;
</code></pre>

<p>I would recommend using a more detailed check inside the ng-if directives :)</p>


blocks|key|522576|text|您可以用ng-attr前缀属性来表示角表达式。当表达式的结果未定义时，这将从属性中移除值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|522577|<a+ng-attr-href="{{value+%7C%7C+undefined}}">Hello+World</a>|code-block|syntax|javascript|522578|将产生(当价值为假时)|522579|<a+ng-attr-href="{{value+%7C%7C+undefined}}"+href>Hello+World</a>|522580|所以不要使用false，因为这会产生单词"false“作为值。|522581|<a+ng-attr-href="{{value+%7C%7C+false}}"+href="false">Hello+World</a>|522582|在指令中使用此技巧时。如果该指令缺少一个值，则该指令的属性将为false。|522583|例如，上面的内容将是错误的。|522584|function+post($scope,+$el,+$attr)+{
++++++var+url+=+$attr['href']+%7C%7C+false;
++++++alert(url+===+false);
}|522585|entityMap^0|4|7|0|0|0|0|6|5|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1A|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1B|8|@]|D|@]|E|$]]|$1|W|3|X|5|H|7|1C|8|@]|D|@]|E|$I|J]]|$1|Y|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|Z|$]]

<p>You can prefix attributes with <code>ng-attr</code> to eval an Angular expression. When the result of the expressions undefined this removes the value from the attribute.</p>

<pre><code>&lt;a ng-attr-href="{{value || undefined}}"&gt;Hello World&lt;/a&gt;
</code></pre>

<p>Will produce (when value is false)</p>

<pre><code>&lt;a ng-attr-href="{{value || undefined}}" href&gt;Hello World&lt;/a&gt;
</code></pre>

<p>So don't use <code>false</code> because that will produce the word "false" as the value.</p>

<pre><code>&lt;a ng-attr-href="{{value || false}}" href="false"&gt;Hello World&lt;/a&gt;
</code></pre>

<p>When using this trick in a directive. The attributes for the directive will be false if they are missing a value.</p>

<p>For example, the above would be false.</p>

<pre><code>function post($scope, $el, $attr) {
      var url = $attr['href'] || false;
      alert(url === false);
}
</code></pre>


blocks|key|522610|text|我是通过努力设置属性来完成这个任务的。并使用属性的布尔值控制属性的适用性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522611|下面是代码片段：|522612|<div+contenteditable="{{+condition+?+'true'+:+'false'}}"></div>|code-block|syntax|javascript|522613|我希望这能帮到你。|522614|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>I got this working by hard setting the attribute. And controlling the attribute applicability using the boolean value for the attribute.</p>

<p>Here is the code snippet:</p>

<pre><code>&lt;div contenteditable="{{ condition ? 'true' : 'false'}}"&gt;&lt;/div&gt;
</code></pre>

<p>I hope this helps.</p>


blocks|key|2632435|text|<h1+ng-attr-contenteditable="{{isTrue+%7C%7C+undefined+}}">{{content.title}}</h1>|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2632436|将产生当isTrue=true：<h1+contenteditable="true">{{content.title}}</h1>|2632437|当isTrue=false：<h1>{{content.title}}</h1>|2632438|entityMap^0|0|25|0|G|1D|0|E|Q|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

<p><code>&lt;h1 ng-attr-contenteditable="{{isTrue || undefined }}"&gt;{{content.title}}&lt;/h1&gt;</code></p>

<p>will produce when isTrue=true :
<code>&lt;h1 contenteditable="true"&gt;{{content.title}}&lt;/h1&gt;</code></p>

<p>and when isTrue=false :
<code>&lt;h1&gt;{{content.title}}&lt;/h1&gt;</code></p>


blocks|key|522680|text|为了获得一个属性来显示基于布尔检查的特定值，或者在布尔检查失败时被完全省略，我使用了以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522681|ng-attr-example="{{params.type+==+'test'+?+'itWasTest'+:+undefined+}}"|offset|length|style|CODE|522682|示例用法：|522683|<div+ng-attr-class="{{params.type+==+'test'+?+'itWasTest'+:+undefined+}}">|522684|会根据<div+class="itWasTest">的值输出params.type还是<div>？|522685|entityMap^0|0|0|1Y|0|0|0|22|0|3|N|U|B|17|5|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]|$D|12|E|13|F|G]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|O|$]]

<p>To get an attribute to show a specific value based on a boolean check, or be omitted entirely if the boolean check failed, I used the following:</p>

<p><code>ng-attr-example="{{params.type == 'test' ? 'itWasTest' : undefined }}"</code></p>

<p>Example usage:</p>

<p><code>&lt;div ng-attr-class="{{params.type == 'test' ? 'itWasTest' : undefined }}"&gt;</code></p>

<p>Would output <code>&lt;div class="itWasTest"&gt;</code> or <code>&lt;div&gt;</code> based on the value of <code>params.type</code></p>


blocks|key|522701|text|此外，您还可以使用如下表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522702|<h1+ng-attr-contenteditable="{{+editMode+?+true+:+false+}}"></h1>|code-block|syntax|javascript|522703|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Also you can use an expression like this:</p>

<pre><code>&lt;h1 ng-attr-contenteditable="{{ editMode ? true : false }}"&gt;&lt;/h1&gt;
</code></pre>


blocks|key|2632544|text|对于输入字段验证，可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2632545|<input+ng-model="discount"+type="number"+ng-attr-max="{{discountType+==+'%25'+?+100+:+undefined}}">|code-block|syntax|javascript|2632546|这将只在将max定义为%25的情况下将属性discountType应用于%25。|offset|length|style|CODE|2632547|entityMap^0|0|0|5|3|B|1|J|C|Y|1|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|N|$]]

<p>For input field validation you can do:</p>

<pre><code>&lt;input ng-model="discount" type="number" ng-attr-max="{{discountType == '%' ? 100 : undefined}}"&gt;
</code></pre>

<p>This will apply the attribute <code>max</code> to <code>100</code> only if <code>discountType</code> is defined as <code>%</code></p>


blocks|key|522726|text|如果您需要角2的解，那么它很简单，请使用下面这样的属性绑定，例如，您只想有条件地使输入读，然后加上方括号，后面跟着=符号和表达式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522727|<input+[readonly]="mode=='VIEW'">+|code-block|syntax|javascript|522728|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Just in case you need solution for Angular 2 then its simple, use property binding like below, e.g. you want to make input read only conditionally, then add in square braces the attrbute followed by = sign and expression.</p>

<pre><code>&lt;input [readonly]="mode=='VIEW'"&gt; 
</code></pre>


blocks|key|2632577|text|编辑:这个答案与Angular2%2B有关！对不起，我错过了标签！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2632578|原来的答案：|2632579|对于非常简单的情况，当您只想应用(或设置)一个属性(如果设置了某个输入值)时，它就像|2632580|<my-element+[conditionalAttr]="optionalValue+%7C%7C+false">|code-block|syntax|javascript|2632581|这和：|2632582|<my-element+[conditionalAttr]="optionalValue+?+optionalValue+:+false">|2632583|(因此，如果不给定optionalValue，则应用该表达式为false，而不应用属性。)|2632584|示例:我遇到了这样的情况:我允许应用颜色，但也可以应用任意样式，其中颜色属性不能像已经设置的那样工作(即使@+but+()颜色没有给出)：|2632585|@Component({
++selector:+"rb-icon",
++styleUrls:+["icon.component.scss"],
++template:+"<span+class="ic-{{icon}}"+[style.color]="color==color"+[ngStyle]="styleObj"+></span>",
})
export+class+IconComponent+{
+++@Input()+icon:+string;
+++@Input()+color:+string;
+++@Input()+styles:+string;

+++private+styleObj:+object;
...
}|2632586|因此，只有在颜色属性存在时才设置"style.color“，否则就可以使用”样式“字符串中的颜色属性。|2632587|当然，这也可以通过|2632588|[style.color]="color"+|2632589|和|2632590|@Input+color:+(string+%7C+boolean)+=+false;|2632591|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|19|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|1B|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1D|8|@]|9|@]|A|$]]|$1|S|3|T|5|H|7|1E|8|@]|9|@]|A|$I|J]]|$1|U|3|V|5|6|7|1F|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|H|7|1H|8|@]|9|@]|A|$I|J]]|$1|10|3|11|5|6|7|1I|8|@]|9|@]|A|$]]|$1|12|3|13|5|H|7|1J|8|@]|9|@]|A|$I|J]]|$1|14|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|15|$]]

<p><em>Edit</em>: This answer is related to Angular2+! Sorry, I missed the tag!</p>

<p><em>Original answer:</em></p>

<p>As for the very simple case when you only want to apply (or set) an attribute if a certain Input value was set, it's as easy as </p>

<pre><code>&lt;my-element [conditionalAttr]="optionalValue || false"&gt;
</code></pre>

<p>It's the same as:</p>

<pre><code>&lt;my-element [conditionalAttr]="optionalValue ? optionalValue : false"&gt;
</code></pre>

<p>(So optionalValue is applied if given otherwise the expression is false and attribute is not applied.)</p>

<p>Example: I had the case, where I let apply a color but also arbitrary styles, where the color attribute didn't work as it was already set (even if the @Input() color wasn't given):</p>

<pre><code>@Component({
  selector: "rb-icon",
  styleUrls: ["icon.component.scss"],
  template: "&lt;span class="ic-{{icon}}" [style.color]="color==color" [ngStyle]="styleObj" &gt;&lt;/span&gt;",
})
export class IconComponent {
   @Input() icon: string;
   @Input() color: string;
   @Input() styles: string;

   private styleObj: object;
...
}
</code></pre>

<p>So, "style.color" was only set, when the color attribute was there, otherwise the color attribute in the "styles" string could be used.</p>

<p>Of course, this could also be achieved with </p>

<pre><code>[style.color]="color" 
</code></pre>

<p>and</p>

<pre><code>@Input color: (string | boolean) = false;
</code></pre>


blocks|key|522746|text|才能做到这一点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522747|ng-attr-aria-current="{{::item.isSelected==true+?+'page'+:+undefined}}"|code-block|syntax|javascript|522748|这里的好处是，如果item.isSelected是假的，那么属性就不会被呈现。|522749|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>Was able to get this working: </p>

<pre><code>ng-attr-aria-current="{{::item.isSelected==true ? 'page' : undefined}}"
</code></pre>

<p>The nice thing here is that if item.isSelected is false then the attribute simply isn't rendered.</p>


<p>I need to be able to add for example "contenteditable" to elements, based on a boolean variable on scope.</p>

<p>Example use:</p>

<pre><code>&lt;h1 attrs="{'contenteditable=\"true\"': editMode}"&gt;{{content.title}}&lt;/h1&gt;
</code></pre>

<p>Would result in contenteditable=true being added to the element if <code>$scope.editMode</code> was set to <code>true</code>.
Is there some easy way to implement this ng-class like attribute behavior? I'm considering writing a directive and sharing if not.</p>

<p><strong>Edit:</strong> 
I can see that there seems to be some similarities between my proposed attrs directive and <a href="https://github.com/angular/angular.js/commit/55027132f3d57e5dcf94683e6e6bd7b0aae0087d#L1L233" rel="noreferrer">ng-bind-attrs, but it was removed in 1.0.0.rc3</a>, why so?</p>


What is the best way to conditionally apply attributes in AngularJS?

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例如，我需要能够根据作用域上的布尔变量向元素添加"contenteditable“。示例使用：<h1 attrs="{'contenteditable=\"true\"': editMode}">{{content.title}}</h1>如果将contenteditable=true设置为true，将导致将$scop...

问在AngularJS中有条件地应用属性的最佳方法是什么？
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