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Blazor InvokeAsync - Custom JS


Hello,

I am currently trying to Invoke the api-keys.js file and run KTAccountAPIKeys.init in my Blazor File. My Component looks like this:


@inject IJSRuntime JS
@inject NavigationManager NavManager
@code {
protected override async Task OnAfterRenderAsync(bool firstRender)
{
if (firstRender)
{
var jsModule = await JS.InvokeAsync<IJSObjectReference>("import", NavManager.ToAbsoluteUri("assets/js/custom/account/api-keys/api-keys.js"));
}
}
}


This seems to load the file only, but not call the function in it. So I tried adding


jsModule.InvokeVoidAsync("KTAccountAPIKeys.init");



@inject IJSRuntime JS
@inject NavigationManager NavManager
@code {
protected override async Task OnAfterRenderAsync(bool firstRender)
{
if (firstRender)
{
var jsModule = await JS.InvokeAsync<IJSObjectReference>("import", NavManager.ToAbsoluteUri("assets/js/custom/account/api-keys/api-keys.js"));
jsModule.InvokeVoidAsync("KTAccountAPIKeys.init");
}
}
}


Trying to call the function in the scope. This also seems not to work, since the console says KTAccountAPIKeys.init is undefined.

Can you please tell me on how to load those functions correctly in from Metronics intended way? Every attempt to load them failed unless I exposed it to the window global scope which I think is not the way to go right?

Would appreciate some help.happyhappy


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Replies (3)


Hi,

Sorry for the late reply.

To fix your error you can follow the steps below.

  1. Open assets/js/custom/account/api-keys/api-keys.js
  2. At the end of the file add the following code to add global object instance.

    window.KTAccountAPIKeys = KTAccountAPIKeys;

  3. In your razor file initialize component using the code below:

    @using Starterkit._keenthemes.libs;

    @inject IKTTheme KTTheme;
    @inject IJSRuntime JS
    @inject NavigationManager NavManager

    <script suppress-error="BL9992" src="@KTTheme.GetAssetPath("js/custom/account/api-keys/api-keys.js")"></script>

    @code {
    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
    if (firstRender) {
    JS.InvokeVoidAsync("KTAccountAPIKeys.init");
    }
    }
    }




Regards,
Lauris Stepanovs,
Keenthemes Support Team

Thank you for the reply, well I understand the concept of setting methods to the global env. But isn't it better to request the file only on the component loaded and not global?

Your Solution will mean that I have to load the file in _LayoutScripts (If I remember the filename, correctly)

Isn't there any other way similar to my attempt above to load the specific JS file only needed for a specific component and then run the methods inside of it?

Also, your solution above works only if the data requests in OnInitializedAsync() isn't taking so long. Because otherwise if Razor is re-rendering stuff since it partially fetched data during OnInitialized --> OnAfterRenderAsync possbily gets called without the needed DOM Element for KTAccountAPIKeys to be present.

Is there any solution you suggest from the side of Metronics beside adding a flag like "IsCompletelyLoaded". Is there any helper function or similar which I can use in my C# to check if element is already present or similar?



Hi,

Yes, you can import and use JavaScript files as a module in your razor components.

  1. Export javascript instance from javascript file.

    export { KTAccountAPIKeys }

  2. Import javascript file as a module and trigger initialization function.

    @using Starterkit._keenthemes.libs;

    @inject IKTTheme KTTheme;
    @inject IJSRuntime JS
    @inject NavigationManager NavManager

    @code {
    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
    if (firstRender) {
    var module = await JS.InvokeAsync<IJSObjectReference>(
    "import", "./assets/js/custom/account/api-keys/api-keys.js");

    await module.InvokeVoidAsync("KTAccountAPIKeys.init");
    }
    }
    }




Regards,
Lauris Stepanovs,
Keenthemes Support Team
Text formatting options
Submit
Here's a how to add some HTML formatting to your comment:
  • <pre></pre> for JS codes block
  • <pre lang="html"></pre> for HTML code block
  • <pre lang="scss"></pre> for SCSS code block
  • <pre lang="php"></pre> for PHP code block
  • <code></code> for single line of code
  • <strong></strong> to make things bold
  • <em></em> to emphasize
  • <ul><li></li></ul>  to make list
  • <ol><li></li></ol>  to make ordered list
  • <h3></h3> to make headings
  • <a></a> for links
  • <img> to paste in an image
  • <blockquote></blockquote> to quote somebody
  • happy  :)
  • shocked  :|
  • sad  :(
Text formatting options
Submit
Here's a how to add some HTML formatting to your comment:
  • <pre></pre> for JS codes block
  • <pre lang="html"></pre> for HTML code block
  • <pre lang="scss"></pre> for SCSS code block
  • <pre lang="php"></pre> for PHP code block
  • <code></code> for single line of code
  • <strong></strong> to make things bold
  • <em></em> to emphasize
  • <ul><li></li></ul>  to make list
  • <ol><li></li></ol>  to make ordered list
  • <h3></h3> to make headings
  • <a></a> for links
  • <img> to paste in an image
  • <blockquote></blockquote> to quote somebody
  • happy  :)
  • shocked  :|
  • sad  :(