Tips for recognizing the custom element that initiated a core-ajax request (as indicated by the core-ajax response)

I am currently utilizing Polymer to create a series of custom elements, specifically post-cards. Each post-card contains a thumbnail image that expands to display the original image when clicked. The link to the original image is fetched from an ajax call to the imgur API using a core-ajax component.

After experimenting with two different approaches, I am still uncertain about the optimal solution:

1. Embedding a core-ajax component within each post-card element.

While this method seems functional, I find it lacking in elegance.

2. Utilizing a single core-ajax component to handle all API requests.

Post-list.html

<core-ajax 
  url="{{imgur_url}}"
  handleAs="json"
  on-core-response="{{handleResponse}}">
</core-ajax>

<template repeat="{{post, postIndex in posts}}">
    <post-card post={{post}} id={{postIndex}} on-img-tap={{imgurRequest}}>
</template>

The main issue I encounter with this approach is the difficulty in identifying which specific post-card element initiated the request upon receiving the response from core-ajax.

I have considered creating a new custom element by extending core-ajax, allowing me to pass and retrieve the post-card's ID as a parameter in the response. However, I believe there must be a simpler solution available, right?

Thank you for your assistance.

Answer №1

Assuming that you have a structure like this.$.ajaxId.go(); within your imgurRequest function (in relation to the second solution), one approach could be to pass the postIndex as ajax parameters. Your modified imgurRequest function would appear as follows:

imgurRequest: function(e, detail, sender) {
  var postIndex = e.target.templateInstance.model.postIndex;
  // Assigning the value of postIndex to a property bound to ajax parameter list here ...
  this.$.ajaxId.go();
}

By implementing this method, you can differentiate between various post cards while utilizing the same function and core-ajax element. It is important for the server to return the received id back to the client in order for this to work properly.

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