Tips on incorporating personalized javascript functions into Durandal

I am currently working on my first project using the Durandal framework to create a basic website. I have encountered an issue while trying to incorporate a simple JavaScript function. My goal is to execute the function after the DOM has loaded, but I am unsure how to connect it to the existing viewmodel. The problem arises when the function gets called before the DOM loads, and the targeted div ID "sb-search" does not yet exist.

My initial attempt was to include the function in the viewmodel:

define(["plugins/router"], function (router) {

var vm = {
        viewAttached: viewAttached
    };

    return {
        router: router
    };

    function attached() {
        new UISearch(document.getElementById('sb-search'));
    }

    return vm;

});

Unfortunately, this approach did not work as intended.

If anyone could offer assistance, I would greatly appreciate it. Even a straightforward tutorial demonstrating how to use "document.write('Hello World')" would be beneficial. Thank you!

Answer №1

This may not be directly related, however, I feel compelled to contribute additional insights to the discussion. It is advisable not to scan the entire global document within the attached handler. This is because composed views may not be fully attached at that point, and making assumptions about the global state can lead to issues. Furthermore, optimizing performance by targeting specific elements instead of scanning the entire DOM is recommended.

When invoking the attached function in Durandal, the root DOM element of the view bound to the view model is passed as the first argument. Utilize this to narrow down your search scope. If dealing with a child or composed view, utilize the compositionComplete handler which triggers after all composition is complete. For parent views, leverage the second argument provided in these functions. If you find this process overly complex, it might indicate design flaws; seeking guidance on MVVM principles could be beneficial.

Additional Notes:

The comments highlight:

  • The importance of exporting the correct function (attached should not be confused with viewAttached),
  • The deprecation of viewAttached in favor of attached when defining an attachment handler for Durandal,
  • A reminder to include an anonymous object with a router property before returning the vm (view model) to avoid any unintended leftovers from previous tests that may have been inadvertently copied and pasted.

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