Svelecte

Remote fetching

Fetching capabilities are defined by fetch property - URL of desired endpoint. Svelecte automatically resolves “fetch mode” by [query] placeholder in fetch property.

When this placeholder [qyery] is presents, svelecte operates in “query” mode. Otherwise switches to “init” mode, where remote endpoint is requested, when component is mounted.

<!-- remote fetch is triggered when user types -->
<Svelecte fetch="https://example.com/url?search=[query]">

<!-- remote fetch is triggered on mount -->
<Svelecte fetch="https://example.com/url">
<!-- remote fetch is triggered when user types -->
<Svelecte fetch="https://example.com/url?search=[query]">

<!-- remote fetch is triggered on mount -->
<Svelecte fetch="https://example.com/url">

Fetching default value

Since v4.0 fetching initial value happens automatically on mount, regardless of “fetch mode”. In v3 it was possible only in init mode.

<script>
  let value="my-value";
  let multiValue=['one','two','three'];
</script>
<!-- URL requested: https://example.com/url?search=init&init=my-value  -->
<Svelecte fetch="https://example.com/url?search=[query]" bind:value>

<!-- URL requested: https://example.com/url?init=my-value  -->
<Svelecte fetch="https://example.com/url" bind:value>

<!-- Multiselect -->
<!-- URL requested: https://example.com/url?search=init&init=one,two,three  -->
<Svelecte multiple fetch="https://example.com/url?search[query]" bind:value={multiValue} />
<script>
  let value="my-value";
  let multiValue=['one','two','three'];
</script>
<!-- URL requested: https://example.com/url?search=init&init=my-value  -->
<Svelecte fetch="https://example.com/url?search=[query]" bind:value>

<!-- URL requested: https://example.com/url?init=my-value  -->
<Svelecte fetch="https://example.com/url" bind:value>

<!-- Multiselect -->
<!-- URL requested: https://example.com/url?search=init&init=one,two,three  -->
<Svelecte multiple fetch="https://example.com/url?search[query]" bind:value={multiValue} />

Manually re-fetching value in “query” mode

Imagine scenario, you have component in query mode with default value set. And you need to change default value, but still keep the same fech mode.

By default changing value='blue' to value='red' wouldn’t change the value. You need to call refetchWith(newValue) API method.

<script>
  let value = ['blue'];
  let el;

  function onClick() {
    el.refetchWith('red');
  }
</script>

<Svelecte bind:this={el} fetch="https://example.com/url?search=[query]" bind:value />
<button on:click={onClick}>Change selected value to red</button>
<script>
  let value = ['blue'];
  let el;

  function onClick() {
    el.refetchWith('red');
  }
</script>

<Svelecte bind:this={el} fetch="https://example.com/url?search=[query]" bind:value />
<button on:click={onClick}>Change selected value to red</button>

Results to:

⚠️ Caution with objects

When using objects as value (with valueAsObject property set), you always need to set strictMode to false. Otherwise initial value won’t be set. Also using refetchWith method has no meaning, because you can set object value directly, no need for fetch request.

  • fetchCallback: Function Response transform function. It contains JSON-ized response. If not specified, one of following properties are tried in given order: data, items, options or response JSON itself as a fallback. Svelecte expects array to be returned.
  • fetchResetOnBlur: boolean Setting to false will keep fetched results in dropdown.
  • minQuery: number Force minimal length of input text to trigger remote request.
  • Settings skipSort: true on searchProps to avoid re-ordering search results. More about search settings at Searching page.

User-provided fetch function

In v4.0 whole fetch-related functionality has been reworked and it’s no longer possible to provide your own fetch function. Properties fetch and fetchProps should be enough for every use case.

Made with Svelte ❤ by Martin Skocik.
♦
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