I have a project in Angular 7 where I am displaying a list of places. Whenever I hover over a place, an AJAX function is triggered to save that information in the database.
However, I noticed that the AJAX function is being called multiple times when I hover over a single element. I only want it to be called once.
Below is the Angular code snippet I am using:
<div *ngFor="let place of mapData" (mouseover)="displayTagInfo($event)">
<div class="filter-name">{{place.name}}</div>
</div>
Within the mapData array object, add a key called hovered = false with an initial value of false. For every element where hovered = false, trigger the function displayTagInfo($event,place).
<div *ngFor="let place of mapData" (mouseover)="displayTagInfo($event,place)">
<div class="filter-name">{{place.name}}</div>
</div>
In your TypeScript file:
displayTagInfo(event,place){
if(!place.hovered){
//Do whatever you need to do in this block
place.hovered = true;
}
}
This method ensures that each element can only be hovered over once. Best of luck!
Essentially, the solution is to incorporate a boolean variable within the function that monitors whether the event has been triggered or not.
To properly implement this functionality, it is essential to initialize the variable within the constructor of the specific component you wish to monitor.
function displayTagInfo(event){
if (this.tagInfoDisplayHasBeenFired) {
return;
}
this.tagInfoDisplayHasBeenFired = true
//Place your code here
}
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