Encountered an issue in Angular 6: Unable to access property '0' of undefined

There's an error popping up in the console saying, Cannot read property '0' of undefined, but surprisingly I'm still getting the expected result.

Below is my HTML code snippet:

<div class="col-md-3">
  <div class="slider-product">
    <a href="#">
      <img src="{{featureProducts[0].img_path}}" alt="Image" style="max-width:100%;">
      <span class="tag">{{featureProducts[0].cat_name}}</span>
      <div>
        <a class="title">{{featureProducts[0].name}}</a>
      </div>
      <div class="price">
        <i class="fa fa-inr"></i> {{featureProducts[0].min_price}}
      </div>
    </a>
  </div>
</div>

This is how the equivalent TypeScript function looks like:

getFeatureProducts(){
this.httpClient.get(this.baseUrl+`/getFeatureProducts`)
  .subscribe(
    (data:any[]) => {
      if(data.length) {
      this.featureProducts = data;
      }else{
      this.featureProducts = null;         
    }
    }
    )}

The variable featureProducts is declared within the class as shown below:

featureProducts: any;

I understand there's a possible workaround for this issue, such as creating separate variables like so:

In TypeScript file:

imgpath0 = this.featureProducts[0].imgPath;

And then using this new variable directly in the HTML as demonstrated here:

{{imgPath0}}

However, this solution might not be ideal considering the number of properties to display in HTML without declaring too many extra variables in TypeScript.

Please note: I prefer not to loop through using 'for' in HTML. Instead, I'd like to fetch the properties similar to typical JSON retrieval methods.

Answer №1

To delay the rendering of the div until the featureProducts object is populated, you can utilize the following code:

*ngIf="featureProducts && featureProducts[0]"
.

<div class="slider-product" *ngIf="featureProducts && featureProducts[0]">
   <a href="#">
      <img src="{{featureProducts[0].img_path}}" alt="Image" style="max-width:100%;">
      <span class="tag">{{featureProducts[0].cat_name}}</span>
      <div>
        <a class="title">{{featureProducts[0].name}}</a>
      </div>
      <div class="price">
        <i class="fa fa-inr"></i> {{featureProducts[0].min_price}}
      </div>
   </a>
</div>

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