What is the best way to wait for JSON to finish loading in CasperJS?

While navigating a website that produces a substantial JSON response, I encounter an issue where the connection is closed before the complete response is received after triggering a click event:

casper.then(function li10() {
    casper.click(SEARCH_BUTTON_CSS);
});

Even after waiting for the URL to show up, it doesn't seem to be enough:

casper.then(function li11() {
    casper.waitForUrl(/\/search-results\/p\?/,
                      function() { 
                          var search_url = casper.getCurrentUrl();
                          console.log('found search results, url = ' + search_url);
                      },
                      function() { 
                          console.log('failed to find search results');
                          casper.exit();
                      },
                      10000);
});

So my question is: What can I reliably wait for to ensure that the JSON data has fully loaded before moving on to the next step?

Answer №1

It seems like the process involves entering a search query, clicking a button, and then using JavaScript to request data via Ajax for an expected JSON response which is then displayed.

casper.waitForUrl() specifically waits for a change in page URL, not related to asynchronous resources like AJAX responses.

You have two options:

  • Determine the exact URL being requested during the search and use casper.waitForResource() to wait for that resource to load.
  • Create a unique selector that will only appear after the search results have been successfully loaded onto the page, using casper.waitForSelector().

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