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Thursday, February 9, 2017

Angular Material - Autocomplete

md-autocomplete, an Angular Directive, is used as a special input control with an inbuilt drop-down to show all possible matches to a custom query. This control acts as a real-time suggestion box as soon as the user types in the input area.
<md-autocomplete> can be used to provide search results from local or remote data sources.md-autocomplete caches results when performing a query. After first call, it uses the cached results to eliminate unnecessary server requests or lookup logic and it can be disabled.

Attributes

S.N.Parameter & Description
1* md-items
An expression in the format of item in items to iterate over matches for your search.
2md-selected-item-change
An expression to be run each time a new item is selected.
3md-search-text-change
An expression to be run each time the search text updates.
4md-search-text
A model to bind the search query text to.
5md-selected-item
A model to bind the selected item to.
6md-item-text
An expression that will convert your object to a single string.
7placeholder
Placeholder text that will be forwarded to the input.
8md-no-cache
Disables the internal caching that happens in autocomplete.
9ng-disabled
Determines whether or not to disable the input field.
10md-min-length
Specifies the minimum length of text before autocomplete will make suggestions.
11md-delay
Specifies the amount of time (in milliseconds) to wait before looking for results.
12md-autofocus
If true, will immediately focus the input element.
13md-autoselect
If true, the first item will be selected by default.
14md-menu-class
This will be applied to the dropdown menu for styling.
15md-floating-label
This will add a floating label to autocomplete and wrap it in md-input-container.
16md-input-name
The name attribute given to the input element to be used with FormController.
17md-input-id
An ID to be added to the input element.
18md-input-minlength
The minimum length for the input's value for validation.
19md-input-maxlength
The maximum length for the input's value for validation.
20md-select-on-match
When set as true, autocomplete will automatically select exact the item if the search text is an exact match.

Example

The following example showcases the use of md-autocomplete directive to showcase use of autocomplete.
am_autocomplete.htm
<html lang="en" >
   <head>
      <link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.css">
      <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
      <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-animate.min.js"></script>
      <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-aria.min.js"></script>
      <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-messages.min.js"></script>
      <script src="https://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.js"></script>
   <script language="javascript">
        angular
           .module('firstApplication', ['ngMaterial'])
           .controller('autoCompleteController', autoCompleteController);

        function autoCompleteController ($timeout, $q, $log) {
           var self = this;
           self.simulateQuery = false;
           self.isDisabled    = false;
           // list of states to be displayed
           self.states        = loadStates();
           self.querySearch   = querySearch;
           self.selectedItemChange = selectedItemChange;
           self.searchTextChange   = searchTextChange;
           self.newState = newState;
           function newState(state) {
              alert("This functionality is yet to be implemented!");
           }    
           function querySearch (query) {
              var results = query ? self.states.filter( createFilterFor(query) ) : self.states, deferred;
              if (self.simulateQuery) {
                 deferred = $q.defer();
                 $timeout(function () { 
                       deferred.resolve( results ); 
                    }, 
              Math.random() * 1000, false);
                 return deferred.promise;
              } else {
                 return results;
              }
           }
           function searchTextChange(text) {
              $log.info('Text changed to ' + text);
           }
           function selectedItemChange(item) {
              $log.info('Item changed to ' + JSON.stringify(item));
           }
           //build list of states as map of key-value pairs
           function loadStates() {
              var allStates = 'Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware,\
                 Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana,\
                 Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana,\
                 Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina,\
                 North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina,\
                 South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia,\
                 Wisconsin, Wyoming';
              return allStates.split(/, +/g).map( function (state) {
                 return {
                    value: state.toLowerCase(),
                    display: state
                 };
              });
           }
           //filter function for search query
           function createFilterFor(query) {
              var lowercaseQuery = angular.lowercase(query);
              return function filterFn(state) {
                 return (state.value.indexOf(lowercaseQuery) === 0);
              };
           }
        }  
   </script>      
   </head>
   <body ng-app="firstApplication" ng-cloak>
      <div ng-controller="autoCompleteController as ctrl" layout="column" ng-cloak>
         <md-content class="md-padding">
            <form ng-submit="$event.preventDefault()">
               <p><code>md-autocomplete</code> can be used to provide search results from local or remote data sources.</p>
               <md-autocomplete
                  ng-disabled="ctrl.isDisabled"
                  md-no-cache="ctrl.noCache"
                  md-selected-item="ctrl.selectedItem"
                  md-search-text-change="ctrl.searchTextChange(ctrl.searchText)"
                  md-search-text="ctrl.searchText"
                  md-selected-item-change="ctrl.selectedItemChange(item)"
                  md-items="item in ctrl.querySearch(ctrl.searchText)"
                  md-item-text="item.display"
                  md-min-length="0"
                  placeholder="US State?">
                  <md-item-template>
                     <span md-highlight-text="ctrl.searchText" md-highlight-flags="^i">{{item.display}}</span>
                  </md-item-template>
                  <md-not-found>
                     No states matching "{{ctrl.searchText}}" were found.
                     <a ng-click="ctrl.newState(ctrl.searchText)">Create a new one!</a>
                  </md-not-found>
               </md-autocomplete>
               <br/>
               <md-checkbox ng-model="ctrl.simulateQuery">Show progress for results?</md-checkbox>
               <md-checkbox ng-model="ctrl.noCache">Disable caching?</md-checkbox>
               <md-checkbox ng-model="ctrl.isDisabled">Disable?</md-checkbox>
               <p><code>md-autocomplete</code> caches results when performing a query.  After first call, it uses the cached results to eliminate unnecessary server requests or lookup logic and it can be disabled.</p>
            </form>
         </md-content>
      </div>
   </body>
</html>

Result

Verify the result.
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