Using Angular 4, you can dynamically insert values into an inline style through interpolation

I am currently teaching myself Angular 4 and have a question regarding the following code snippet:

<div class="progress">
    <div class="progress-bar" role="progressbar" aria-valuenow="0" aria-
valuemin="0" aria-valuemax="100" style="width {{ item.percent_position}}%;">
{{ item.percent_position }}</div>
</div>

I am attempting to dynamically adjust the width of the progress bar based on the value of {{item.percent_position}}

When I try using [style]="width: {{ item.percent_position }}%;", I encounter this error:
Uncaught Error: Quotes are not supported for evaluation! Statement: {{item.percent_position}}%;

Here is what I am aiming for: https://i.sstatic.net/99uC8.png

However, the current result with the existing code is shown here: https://i.sstatic.net/8GYcB.png

htmlcssangularbootstrap-4

Answer №1

When incorporating square brackets, you are establishing a binding to an expression. Therefore, the suggested solution provided by Angular may not function as expected since it requires executable JS:

 [style]="width: {{ item.percent_position }}%;"

On the other hand, the following alternative should operate without issue:

 [style.width]="item.percent_position + '%' "

If there are multiple styles that need to be bound, you can utilize ngStyle to bind to an object:

 [ngStyle]="{ 'width': item.percent_position + '%' }"

In any scenario, if square brackets are utilized, ensure that what is being bound is an executable expression!

Answer №2

After some experimentation, I discovered that the original style method didn't produce the desired outcome. Instead, I decided to incorporate a personalized class and utilize that for the styling. Here's an example:

<div class="{{ item.customClass }}">

Hopefully, this alternative solution proves beneficial to anyone browsing through this content.

Answer №3

Instead of using style attribute, you have the option to utilize [ngStyle]. 

<div [ngStyle]="{'width':containerWidth}"></span>

Answer №4

[ngStyle]="{'background': dynamicColor}"

Similar to how I implemented it for a element

examination

where the color variable is passed in as part of a component.

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