How to solve HTMX Partial Page Load issue caused by parallel script download?

Question

By default the browser downloads and executes the script as soon as it reaches it in html file(unless defer or async attributes are used to force parallel download), So if you include a JS Library and then write the script dependent on the JS Library everything works fine.

However I've noticed that it's not the case with a partial pages. If it contains a library and script dependent on it, then before the library is downloaded and executed, the remaining scripts are called which create a problem as they were dependent on library.

In my example I use HTMX partial page load to load HTML content which includes Plotly.js library and after it, html code and JS script required to create a chart. E.g.

<script src="https://cdn.plot.ly/plotly-2.20.0.min.js" charset="utf-8"></script>
<div>
    <div id="f657405b-14c4-4ca1-aef4-88d5842739f5" class="plotly-graph-div" style="height:256px; width:100%;"></div>
    <script type="text/javascript">
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false, "responsive": true})};
    </script>
</div>

When I refresh the page it loads perfectly as JS Library is downloaded and executed before chart's html and script. however in partial page load, before JS library is downloaded and executed, each plot's JS script is called which raises the error:

Uncaught ReferenceError: Plotly is not defined

So, How can serial load be enforced in partial pages?

or alternatively is there a better way to include JS libraries for specific pages to avoid this issue?

Could you try to wrap the chart creating JS inside a [`htmx.onLoad()` method](https://htmx.org/api/#onLoad)? — Dauros, Apr 17 '23 at 10:18
That won't work unless I write an event to call each script that that requires a library. even then by the time event is called, scripts are called before library is loaded. — Towhid, Apr 20 '23 at 11:08
[htmx:beforeRequest](https://htmx.org/events/#htmx:beforeRequest) event can be used to load libraries before a partial page load. but it's not an elegant solution as it's both hard to implement in large projects and it's slow as the page-load will be done after libraries are downloaded which is slow. — Towhid, Apr 20 '23 at 11:46

score 1 · Answer 1 · answered Apr 25 '23 at 20:11

Have you tried to import the Plotly lib inside each plots' JS script? Something like this should work:

<script type="module">
  import 'https://cdn.plot.ly/plotly-2.20.0.min.js';
  window.PLOTLYENV=window.PLOTLYENV || {}; if (document.getElementById("f657405b-14c4-4ca1-aef4-88d5842739f5")) {Plotly.newPlot("f657405b-14c4-4ca1-aef4-88d5842739f5",[{"labels":["Newly 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false, "responsive": true})};
</script>

Note that your script must be of type="module". Alternatively you can use a dynamic import:

<script>
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</script>

score 1 · Answer 2 · answered Apr 27 '23 at 11:19

I think you should not load dependencies on each refresh. But in case it is necessary you need to insert your scripts dynamically and on their load event proceed with the rest of the code. Benefit also will be that the dependency can be loaded just once into the head of the main page.

function addScript( src, callback ) {
  var s = document.createElement( 'script' );
  s.setAttribute( 'src', src );
  s.onload=callback;
  document.body.appendChild( s );
}

In the callback you can initialize plotly so together it would look like this:

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        s.setAttribute( 'src', src );
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        document.body.appendChild( s );
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    addScript("https://cdn.plot.ly/plotly-2.20.0.min.js", initPlotly);
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See https://stackoverflow.com/a/69616316/5173936 for dynamic script loading

How to solve HTMX Partial Page Load issue caused by parallel script download?

2 Answers2

Linked