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clarify use of placeholders (#4660)

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alexweissman 2017-10-11 22:42:44 -04:00
parent 444906bb6d
commit 93c163965d
1 changed files with 33 additions and 14 deletions
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45
pages/10.placeholders/docs.md
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@ -13,7 +13,7 @@ Select2 supports displaying a placeholder value using the `placeholder` configur
The most common situation is to use a string of text as your placeholder value. The most common situation is to use a string of text as your placeholder value.
**In order for a string placeholder value to appear**, you must have a blank `<option>` as the first option in your `<select>` control. This is because the browser tries to select the first option by default. If your first option were non-empty, the browser would display this instead of the placeholder. Note that this issue does not apply to multiple selects. ### Single select placeholders
<div class="s2-example"> <div class="s2-example">
<p> <p>
@ -21,22 +21,41 @@ The most common situation is to use a string of text as your placeholder value.
<option></option> <option></option>
</select> </select>
</p> </p>
<p>
<select class="js-example-placeholder-multiple js-states form-control" multiple="multiple"></select>
</p>
</div> </div>
<pre data-fill-from=".js-code-placeholder"></pre> ```html
<select class="js-example-placeholder-single js-states form-control">
<option></option>
</select>
```
<script type="text/javascript" class="js-code-placeholder"> <pre data-fill-from="#example-placeholder-single-select"></pre>
$(".js-example-placeholder-single").select2({
placeholder: "Select a state",
allowClear: true
});
$(".js-example-placeholder-multiple").select2({ <script type="text/javascript" id="example-placeholder-single-select" class="js-code-placeholder">
placeholder: "Select a state" $(".js-example-placeholder-single").select2({
}); placeholder: "Select a state",
allowClear: true
});
</script>
>>> **For single selects only**, in order for the placeholder value to appear, you must have a blank `<option>` as the first option in your `<select>` control. This is because the browser tries to select the first option by default. If your first option were non-empty, the browser would display this instead of the placeholder.
### Multi-select placeholders
For multi-selects, you must **not** have an empty `<option>` element:
<select class="js-example-placeholder-multiple js-states form-control" multiple="multiple"></select>
```html
<select class="js-example-placeholder-multiple js-states form-control" multiple="multiple"></select>
```
<pre data-fill-from="#example-placeholder-multi-select"></pre>
<script type="text/javascript" id="example-placeholder-multi-select" class="js-code-placeholder">
$(".js-example-placeholder-multiple").select2({
placeholder: "Select a state"
});
</script> </script>
>>> Select2 uses the `placeholder` attribute on multiple select boxes, which requires IE 10+. You can support it in older versions with [the Placeholders.js polyfill](https://github.com/jamesallardice/Placeholders.js). >>> Select2 uses the `placeholder` attribute on multiple select boxes, which requires IE 10+. You can support it in older versions with [the Placeholders.js polyfill](https://github.com/jamesallardice/Placeholders.js).