Angular: Real-time monitoring of changes in the attribute value of a modal dialog and applying or removing a class to the element

I cannot seem to figure out a solution for the following issue: I have two sibling div elements. The second one contains a button that triggers a modal dialog with a dark overlay. However, in my case, the first div appears on top of the modal dialog due to stacking order. While I understand the concept behind this, I need to find a workaround without altering the existing structure.

The modal dialog has a boolean attribute named "opened". Is there a way for me to dynamically monitor the value of this attribute and use ngClass to adjust the z-index of the second sibling element to ensure it is always displayed above all other elements when the modal is open? This adjustment should be removed once the modal is closed.

Any suggestions or assistance would be greatly appreciated.

<div style='z-index: 2'></div>
<div style='z-index: 1'>
    <button (click)="openModal()">Open modal</button>
    <div id="modal" style='z-index: 3'>Here is the modal content</div>
</div>
angulartypescriptattributesmodal-dialogz-index

Answer №1

If you're considering changing the structure, I suggest looking at @Drenai's approach in the comments. However, if altering the structure isn't an option, here's a CSS solution inspired by W3Schools.

Start by maintaining a boolean variable in your controller to track whether the modal is open or not (let's call it isModalOpened).

export class MyComponent {
    public isModalOpened = false;
}

In your stylesheet, set the position of div#modal to fixed and stretched across the screen. This will act as the overlay for the modal content, while the modal itself will be the actual box.

/* the modal (background) */
#modal {
    position: fixed;                     
    z-index: 1;                          
    left: 0;
    top: 0;
    width: 100%;                         
    height: 100%;                        
    overflow: auto;                      
    background-color: rgb(0,0,0);        
    background-color: rgba(0,0,0,0.4);   
}

/* modal box */
.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%; 
}

/* modal close button */
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

In your HTML, wrap the modal content within a .modal-content div, and use isModalOpened to conditionally show the modal only when it's opened.

<div>In 1st div tag.</div>

<div>
    <button (click)="isModalOpened = true">Open modal</button>

    <div id="modal" *ngIf="isModalOpened">

        <div class="modal-content">
           <p>Here is the modal content</p>

           <button class="close" (click)="isModalOpened = false">&times;</button>
        </div>

    </div>

</div>

When the "Open modal" button is clicked, isModalOpened is set to true, and clicking the modal's close button sets it back to false. This ensures that the open and close functionality of the modal works smoothly, while also resolving the z-index issue with the help of position: fixed.

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