Combine [NgStyle] With Condition (if..else)

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最佳答案

Using a ternary operator inside the ngStyle binding will function as an if/else condition.

<div [ngStyle]="{'background-image': 'url(' + value ? image : otherImage + ')'}"></div>

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One can also use this kind of condition:

<div [ngStyle]="myBooleanVar && {'color': 'red'}"></div>

It requires a bit less string concatenation...

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The previous answers did not work for me, so I decided to improve this.

You should work with url(''), and not with value.

<li *ngFor="let item of items">
<div
class="img-wrapper"
[ngStyle]="{'background-image': !item.featured ? 'url(\'images/img1.png\')' : 'url(\'images/img2.png\')'}">
</div>
</li>

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You can use this as follows:

<div [style.background-image]="value ? 'url(' + imgLink + ')' : 'url(' + defaultLink + ')'"></div>

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Use:

[ngStyle]="{'background-image': 'url(' +1=1 ? ../../assets/img/emp-user.png : ../../assets/img/emp-default.jpg + ')'}"

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To add and simplify Günter Zöchbauer's the example incase using (if...else) to set something else than background image :

<p [ngStyle]="value == 10 && { 'font-weight': 'bold' }">

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<h2 [ngStyle]="serverStatus == 'Offline'? {'color': 'red'{'color':'green'}">Server with ID: \{\{serverId}} is \{\{getServerStatus()}} </h2>

or you can also use something like this:

<h2 [ngStyle]="{backgroundColor: getColor()}">Server with ID: \{\{serverId}} is \{\{getServerStatus()}}</h2>

and in the *.ts

getColor(){return this.serverStatus === 'Offline' ? 'red' : 'green';}

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I have used the below code in my existing project

<div class="form-group" [ngStyle]="{'border':isSubmitted && form_data.controls.first_name.errors?'1px solid red':'' }">
</div>

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Trying to set background color based on condition:


Consider variable x with some numeric value.
<p [ngStyle]="{ backgroundColor: x > 4 ? 'lightblue' : 'transparent' }">
This is a sample Text
</p>

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[ngStyle] with condition based if and else case.

<label for="file" [ngStyle]="isPreview ? {'cursor': 'default'} : {'cursor': 'pointer'}">Attachment</label>