Select2 start with input field instead of dropdown

2019-01-21 22:27发布

站内文章 / JavaScript
26 0 0

问题:

I use the js library select2. This is a screenshot of what I have now:
Start:

Click on dropdown:

Now is it possible to have an input field to start with and not directly a dropdownlist? I know it's possible because you can find it on the select2 site. An example is this:

But the documentation is very brief. This is what I have now:

<input type="text" name="questions[question1]" id="question1" class="question1" style="width:500px"/>

function createQuestionTags(data, question_number){
  $(".question" + question_number).select2({
    createSearchChoice: function (term, data) {
      if ($(data).filter(function () {
        return this.text.localeCompare(term) === 0;
      }).length === 0) {
        return {
          id: term,
          text: term
        };
      }
    },
    data: data,
    placeholder: "Enter Question",
    allowClear:true
  });
}

(The data is received from an ajax call)

回答1:

What you are seeing is actually a multi-select or multi-value drop down box in that example. It is not a single value drop down box like you are using in your code. Per the Select2 website, select2 will detect that you are trying to use a multi-select box and will automatically apply that styling instead of the default (drop down arrow, etc.).

If you in fact need a single value drop down box, there is no direct way to make it display with the formatting of the multi-select so that it looks like a regular input box. There may be a way to fake it by adding or removing CSS classes. I played around a bit but couldn't find one.

Since you don't want the formatting, the search box, or the multi-select capability (I'm assuming) you probably don't need to use the select2 library.

Update: It looks like you're not the first person to try to do this. They plan to add this feature but it might be a while: https://github.com/ivaynberg/select2/issues/1345



回答2:

The only workaround that I could come up with is to use both multiple: true and maximumSelectionSize: 1 when setting up.

Please see my example here: http://jsfiddle.net/DanEtchy/Lnf8j/



回答3:

This is possible in Select2 4.0.0 with the new selection adapters. You can swap out the SingleSelection with a MultipleSelection (including any relevant decorators) and it should behave as expected.

$.fn.select2.amd.require([
  'select2/selection/multiple',
  'select2/selection/search',
  'select2/dropdown',
  'select2/dropdown/attachBody',
  'select2/dropdown/closeOnSelect',
  'select2/compat/containerCss',
  'select2/utils'
], function (MultipleSelection, Search, Dropdown, AttachBody, CloseOnSelect, ContainerCss, Utils) {
  var SelectionAdapter = Utils.Decorate(
    MultipleSelection,
    Search
  );
  
  var DropdownAdapter = Utils.Decorate(
    Utils.Decorate(
      Dropdown,
      CloseOnSelect
    ),
    AttachBody
  );
  
  $('.inline-search').select2({
    dropdownAdapter: DropdownAdapter,
    selectionAdapter: SelectionAdapter
  });
  
  $('.dropdown-search').select2({
    selectionAdapter: MultipleSelection
  });
  
  $('.autocomplete').select2({
    dropdownAdapter: DropdownAdapter,
    selectionAdapter: Utils.Decorate(SelectionAdapter, ContainerCss),
    containerCssClass: 'select2-autocomplete'
  });
});
.select2-selection__choice__remove {
  display: none !important;
}

.select2-container--focus .select2-autocomplete .select2-selection__choice {
  display: none;
}
<link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.css" rel="stylesheet"/>

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.full.js"></script>

<p>With an inline search box</p>

<select style="width: 200px" class="inline-search">
  <option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option>
</select>

<p>With the search box in the dropdown</p>

<select style="width: 200px" class="dropdown-search">
  <option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option>
</select>

<p>With the selection hidden when it is focused</p>

<select style="width: 200px" class="autocomplete">
  <option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option>
</select>

By default, Select2 will set up the dropdown to have the search (instead of the selection container) which you will need to override if you want to perfectly emulate a multiple select.



回答4:

Instead of Select2 the better choice would be selectize because Select2 seems dead

The usage is easy:

$('select').selectize(options);

Here is number of examples how to use and customize selectize



回答5:

In my case, I wanted the user's selections from the dropdown to appear in a list below the dropdown, rather than working like a regular dropdown list. So this workaround worked for me:

$('#myselect').select2({
    multiple:true
})
.on('select2:select', function (e) {
    //clear the input box after a selection is made
    $(this).val([]).trigger('change');
});

Of course that won't work if you want the selected item to stay selected in select2's input box like it does with a regular select2 multiselect list.



回答6:

Custom implementation using Bootstrap styling, simple but functional:

var elements = $(document).find('select.form-control');
for (var i = 0, l = elements.length; i < l; i++) {
  var $select = $(elements[i]), $label = $select.parents('.form-group').find('label');
  
  $select.select2({
    allowClear: false,
    placeholder: $select.data('placeholder'),
    minimumResultsForSearch: 0,
    theme: 'bootstrap',
		width: '100%' // https://github.com/select2/select2/issues/3278
  });
  
  // Trigger focus
  $label.on('click', function (e) {
    $(this).parents('.form-group').find('select').trigger('focus').select2('focus');
  });
  
  // Trigger search
  $select.on('keydown', function (e) {
    var $select = $(this), $select2 = $select.data('select2'), $container = $select2.$container;
    
    // Unprintable keys
    if (typeof e.which === 'undefined' || $.inArray(e.which, [0, 8, 9, 12, 16, 17, 18, 19, 20, 27, 33, 34, 35, 36, 37, 38, 39, 44, 45, 46, 91, 92, 93, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 123, 124, 144, 145, 224, 225, 57392, 63289]) >= 0) {
      return true;
    }

    // Already opened
    if ($container.hasClass('select2-container--open')) {
      return true;
    }

    $select.select2('open');

    // Default search value
    var $search = $select2.dropdown.$search || $select2.selection.$search, query = $.inArray(e.which, [13, 40, 108]) < 0 ? String.fromCharCode(e.which) : '';
    if (query !== '') {
      $search.val(query).trigger('keyup');
    }
  });

  // Format, placeholder
  $select.on('select2:open', function (e) {
		var $select = $(this), $select2 = $select.data('select2'), $dropdown = $select2.dropdown.$dropdown || $select2.selection.$dropdown, $search = $select2.dropdown.$search || $select2.selection.$search, data = $select.select2('data');
    
    // Above dropdown
    if ($dropdown.hasClass('select2-dropdown--above')) {
      $dropdown.append($search.parents('.select2-search--dropdown').detach());
    }

    // Placeholder
    $search.attr('placeholder', (data[0].text !== '' ? data[0].text : $select.data('placeholder')));
  });
}
/* !important not needed with less */

.form-group {
  padding: 25px;
}

.form-group.above {
  position: absolute;
  bottom: 0; left: 0; right: 0;
}

.select2-container--open .select2-selection {
    box-shadow: none!important;
}

.select2-container--open .select2-selection .select2-selection__arrow {
    z-index: 9999; /* example */
}

.select2-dropdown {
  /* .box-shadow(@form-control-focus-box-shadow); (from select2-boostrap */
  -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(102, 175, 233, 0.6);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(102, 175, 233, 0.6);
  
  /* border-color: @input-border-focus; */
  border-color: #66afe9;
  border-top-width: 1px!important;
  border-top-style: solid!important;
  /* border-top-left-radius: @input-border-radius; */
  border-top-left-radius: 4px!important;
  /* border-top-right-radius: @input-border-radius; */
  border-top-right-radius: 4px!important;
  
  /* margin-top: -@input-height-base; */
  margin-top: -34px!important;
}

.select2-dropdown .select2-search {
    padding: 0;
}

.select2-dropdown .select2-search .select2-search__field {
  
  /* !important not needed using less */
  border-top: 0!important;
  border-left: 0!important;
  border-right: 0!important;
  border-radius: 0!important;
  
  /* padding: @padding-base-vertical @padding-base-horizontal; */
  padding: 6px 12px;
  
  /* height: calc(@input-height-base - 1px); */
  height: 33px;
}

.select2-dropdown.select2-dropdown--above {
  /* border-bottom: 1px solid @input-border-focus; */
  border-bottom: 1px solid #66afe9!important;
  /* border-bottom-left-radius: @input-border-radius; */
  border-bottom-left-radius: 4px!important;
  /* border-bottom-right-radius: @input-border-radius; */
  border-bottom-right-radius: 4px!important;
  /* margin-top: @input-height-base; */
  margin-top: 34px!important;
}

.select2-dropdown.select2-dropdown--above .select2-search .select2-search__field {
  /* border-top: 1px solid @input-border; */
  border-top: 1px solid #66afe9!important;
  border-bottom: 0!important;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.1/css/select2.min.css" rel="stylesheet"/>
<link href="https://select2.github.io/select2-bootstrap-theme/css/select2-bootstrap.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.1/js/select2.full.min.js"></script>
<div class="form-group">
  <label class="control-label">Below example (click label to focus)</label>
  <select class="form-control" id="select2-single-box" name="select2-single-box" data-placeholder="Pick your choice" data-tabindex="1">
    <option></option>
    <option value="1">First choice</option>
    <option value="2">Second choice</option>
    <option value="3">Third choice</option>
    <option value="4">Fourth choice</option>
    <option value="5">Fifth choice</option>
    <option value="6">Sixth choice</option>
    <option value="7">Seventh choice</option>
    <option value="8">Eighth choice</option>
    <option value="9">Ninth choice</option>
  </select>
</div>
<div class="form-group above">
  <label class="control-label">Above example (click label to focus)</label>
  <select class="form-control" id="select2-single-box" name="select2-single-box" data-placeholder="Pick your choice" data-tabindex="2">
    <option></option>
    <option value="1">First choice</option>
    <option value="2">Second choice</option>
    <option value="3">Third choice</option>
    <option value="4">Fourth choice</option>
    <option value="5">Fifth choice</option>
    <option value="6">Sixth choice</option>
    <option value="7">Seventh choice</option>
    <option value="8">Eighth choice</option>
    <option value="9">Ninth choice</option>
  </select>
</div>

Select2's minimumInputLength: 1 option can hide the dropdown on focus/open...

Update: Code cleanup, don't open dropdown on focus.



回答7:

Matt,)

this work

    $('.search-town-flat').select2({
        multiple: true,
        placeholder: "Enter values",
        allowClear: true,
        maximumSelectionLength: 2,
        theme      : "classic"
    }).on('select2:select', function (e) {
        $(this).val([]).trigger('change');
        $(this).val([e.params.data.id]).trigger("change");
    });


回答8:

$.fn.select2.amd.require([
  'select2/selection/multiple',
  'select2/selection/search',
  'select2/dropdown',
  'select2/dropdown/attachBody',
  'select2/dropdown/closeOnSelect',
  'select2/compat/containerCss',
  'select2/utils'
], function (MultipleSelection, Search, Dropdown, AttachBody, CloseOnSelect, ContainerCss, Utils) {
  var SelectionAdapter = Utils.Decorate(
    MultipleSelection,
    Search
  );
  
  var DropdownAdapter = Utils.Decorate(
    Utils.Decorate(
      Dropdown,
      CloseOnSelect
    ),
    AttachBody
  );
  
  $('.inline-search').select2({
    dropdownAdapter: DropdownAdapter,
    selectionAdapter: SelectionAdapter
  });
  
  $('.dropdown-search').select2({
    selectionAdapter: MultipleSelection
  });
  
  $('.autocomplete').select2({
    dropdownAdapter: DropdownAdapter,
    selectionAdapter: Utils.Decorate(SelectionAdapter, ContainerCss),
    containerCssClass: 'select2-autocomplete'
  });
});
.select2-selection__choice__remove {
  display: none !important;
}

.select2-container--focus .select2-autocomplete .select2-selection__choice {
  display: none;
}
<link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.css" rel="stylesheet"/>

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.full.js"></script>

<p>With an inline search box</p>

<select style="width: 200px" class="inline-search">
  <option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option>
</select>

<p>With the search box in the dropdown</p>

<select style="width: 200px" class="dropdown-search">
  <option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option>
</select>

<p>With the selection hidden when it is focused</p>

<select style="width: 200px" class="autocomplete">
  <option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option><option value="AL">Alabama</option>
  <option value="AK">Alaska</option>
  <option value="AZ">Arizona</option>
</select>



回答9:

I simply formatted a standard input box with CSS to look like a Select2() dropdown:

input {
    width: 100%;
    padding: 7px 5px;
    margin: 1px 0;
    display: inline-block;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}


标签： javascript jquery drop-down-menu input jquery-select2
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