Svelte: The selection issue that's not updating [CSS glitch]

I am utilizing a Svelte Selection component to fetch and display data in a dropdown. Users have the ability to select different properties, which is functioning correctly. However, I am encountering an issue when attempting to preselect certain options despite trying various methods.

{#if properties.length > 0 && selectedProperties.length > 0}
<div class="pb-16">
    <label for="propertyDropdown">Select Company Properties:</label>
    <select id="propertyDropdown" bind:value={selectedProperties} on:change={handlePropertySelection}
            class="styled-dropdown"
            multiple>
        {#each properties as {name, label}}
        <option title={name} value={name}>{label}</option>
        {/each}
    </select>
</div>
{/if}

To prefill the selection with the method onMount, I set the selectedProperties:

let selectedProperties: string[];
...
const handleCodeReceived = async function (code: string) {
    try {
        accessToken = await handleAuthentication(code) ?? "";
        if (accessToken) {
            properties = await fetchCompanyProperties(accessToken);

            const selectedOptions = Array.from(properties.filter((property) => !property.hidden).map((option) => option.name));
            selectedProperties = selectedOptions;
        }
    } catch (error: any) {
        errorMessage = error.message;
    }
};

It is worth noting that manual selection works as expected, and when manually selecting one element, the preselected elements are automatically also selected. This indicates that the selectedProperties array contains the correct data, suggesting a potential issue with the Svelte UI state. Any assistance on this matter would be highly appreciated.

const handlePropertySelection = (event: Event) => {
    const selectElement = event.target as HTMLSelectElement;
    const selectedOptions = Array.from(selectElement.selectedOptions).map((option) => option.value);
    selectedProperties = selectedOptions;
};

I

Answer №1

Shoutout to @Thomas Hennes' helpful REPL which revealed that the issue at hand was actually completely unrelated to the original code and quite silly in nature.

As it turns out, the selection logic was functioning perfectly fine all along. The misinterpretation stemmed from the CSS style making it appear as though the selection wasn't happening:

.styled-dropdown option {
    /*This line caused the confusion: 
    background-color: #fff;*/
    color: #333;
    padding: 10px;
    cursor: pointer;
}

I have decided to keep this response here just in case anyone else encounters a similar stumbling block like me.

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