Editable 'Select' element

问题

I would like to have a select element in the form but besides the options in the dropdown, it would be useful to be able to edit it and add new option but not with another input text, I need all in once. Is it possible?

回答1:

Nothing is impossible. Here's a solution that simply sets the value of a text input whenever the value of the <select> changes: Demo on JSFiddle
Rendering has been tested on Firefox and Google Chrome.

<style>
  .select-editable { position:relative; background-color:white; border:solid grey 1px;  width:120px; height:18px; }
  .select-editable select { position:absolute; top:0px; left:0px; font-size:14px; border:none; width:120px; margin:0; }
  .select-editable input { position:absolute; top:0px; left:0px; width:100px; padding:1px; font-size:12px; border:none; }
  .select-editable select:focus, .select-editable input:focus { outline:none; }
</style>

<div class="select-editable">
  <select onchange="this.nextElementSibling.value=this.value">
    <option value=""></option>
    <option value="115x175 mm">115x175 mm</option>
    <option value="120x160 mm">120x160 mm</option>
    <option value="120x287 mm">120x287 mm</option>
  </select>
  <input type="text" name="format" value=""/>
</div>

You can also do this in HTML5 with the input list attribute and <datalist> element:

<input list="browsers" name="browser">
<datalist id="browsers">
  <option value="Internet Explorer">
  <option value="Firefox">
  <option value="Chrome">
  <option value="Opera">
  <option value="Safari">
</datalist>

回答2:

Similar to answer above but without the absolute positioning:

<select style="width: 200px; float: left;" onchange="this.nextElementSibling.value=this.value">
    <option></option>
    <option>1</option>
    <option>2</option>
    <option>3</option> 
</select>
<input style="width: 185px; margin-left: -199px; margin-top: 1px; border: none; float: left;"/>

So create a input box and put it over the top of the combobox

回答3:

Based on the other answers, here is a first draft for usage with knockout:

Usage

      <div data-bind="editableSelect: {options: optionsObservable, value: nameObservable}"></div>

Knockout data binding

composition.addBindingHandler('editableSelect',
  {
    init: function(hostElement, valueAccessor) {

      var optionsObservable = getOptionsObservable();
      var valueObservable = getValueObservable();

      var $editableSelect = $(hostElement);
      $editableSelect.addClass('select-editable');

      var editableSelect = $editableSelect[0];

      var viewModel = new editableSelectViewModel(optionsObservable, valueObservable);
      ko.applyBindingsToNode(editableSelect, { compose: viewModel });

      //tell knockout to not apply bindings twice
      return { controlsDescendantBindings: true };

      function getOptionsObservable() {
        var accessor = valueAccessor();
        return getAttribute(accessor, 'options');
      }

      function getValueObservable() {
        var accessor = valueAccessor();
        return getAttribute(accessor, 'value');
      }
    }
  });

View

<select
  data-bind="options: options, event:{ focus: resetComboBoxValue, change: setTextFieldValue} "
  id="comboBox"
  ></select>
<input
  data-bind="value: value, , event:{ focus: textFieldGotFocus, focusout: textFieldLostFocus}"
  id="textField"
  type="text"/>

ViewModel

define([
  'lodash',
  'services/errorHandler'
], function(
  _,
  errorhandler
) {

  var viewModel = function(optionsObservable, valueObservable) {

    var self = this;
    self.options = optionsObservable();
    self.value = valueObservable;
    self.resetComboBoxValue = resetComboBoxValue;
    self.setTextFieldValue = setTextFieldValue;
    self.textFieldGotFocus = textFieldGotFocus;
    self.textFieldLostFocus = textFieldLostFocus;

    function resetComboBoxValue() {
      $('#comboBox').val(null);
    }

    function setTextFieldValue() {
      var selection = $('#comboBox').val();
      self.value(selection);
    }

    function textFieldGotFocus() {
      $('#comboBox').addClass('select-editable-input-focus');

    }

    function textFieldLostFocus() {
      $('#comboBox').removeClass('select-editable-input-focus');
    }

  };
  errorhandler.includeIn(viewModel);

  return viewModel;
});

CSS

.select-editable {

  display: block;
  width: 100%;
  height: 31px;
  padding: 6px 12px;
  font-size: 12px;
  line-height: 1.42857143;
  color: #555555;
  background-color: #ffffff;
  background-image: none;
  border: 1px solid #cccccc;
  border-radius: 0px;
  -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
  -webkit-transition: border-color ease-in-out .15s, -webkit-box-shadow ease-in-out .15s;
  -o-transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
  transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;padding: 0;
}


.select-editable select {
  outline:0;
  padding-left: 10px;
  border:none;
  width:100%;
  height: 29px;
}


.select-editable input {
  outline:0;
  position: relative;
  top: -27px;
  margin-left: 10px;
  width:90%;
  height: 25px;
  border:none;
}

.select-editable select:focus {
  outline:0;
  border: 1px solid #66afe9;
  -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, 0.6);
  box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, 0.6);
}




.select-editable input:focus {
  outline:0;
}

.select-editable-input-focus {
outline:0;
  border: 1px solid #66afe9 !important;
  -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, 0.6);
  box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, 0.6);
}

回答4:

A bit more universal <select name="env" style="width: 200px; position:absolute;" onchange="this.nextElementSibling.value=this.value">
    <option></option>
    <option>1</option>
    <option>2</option>
    <option>3</option> 
</select>
<input style="width: 178px; margin-top: 1px; border: none; position:relative; left:1px; margin-right: 25px;" value="123456789012345678901234"/>layout ...

来源：https://stackoverflow.com/questions/2141357/editable-select-element