I'm using Angular Material md-autocomplete in my project. In that I'm getting the suggest listing from the Service Host via ajax call using $http service.
Issue: $http issue - Values can't be returned before a promise is resolved in
md-autocompleteAngular MaterialMy Requirement: I need an updated Suggestion List using remote data sources in
md-autocompleteAngular Material - Ajax$httpservice.
I used the approach as mentioned in Angular Material link https://material.angularjs.org/latest/demo/autocomplete
Source Code:
Scenario 1:
HTML Source Code:
<md-autocomplete flex required
md-input-name="autocompleteField"
md-no-cache="true"
md-input-minlength="3"
md-input-maxlength="18"
md-selected-item="SelectedItem"
md-search-text="searchText"
md-items="item in querySearch(searchText)"
md-item-text="item.country" Placeholder="Enter ID" style="height:38px !important;">
<md-item-template>
<span class="item-title">
<span md-highlight-text="searchText" md-highlight-flags="^i"> {{item.country}} </span>
</md-item-template>
</md-autocomplete>
AngularJS Script:
//bind the autocomplete list when text change
function querySearch(query) {
var results = [];
$scope.searchText = $scope.searchText.trim();
if (query.length >=3) {
results = LoadAutocomplete(query);
}
return results;
}
//load the list from the service call
function LoadAutocomplete(id) {
var countryList = [];
$http({
method: "post",
url: "https://www.bbminfo.com/sample.php",
params: {
token: id
}
})
.success(function (response) {
countryList = response.records;
});
return countryList;
}
Scenario 2:
HTML with AngularJS Source Code:
<!DOCTYPE html>
<html>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.css">
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-animate.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-aria.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-messages.min.js"></script>
<!-- Angular Material Library -->
<script src="http://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<p>Person to Select:</p>
<md-autocomplete
ng-disabled="isDisabled"
md-no-cache="noCache"
md-selected-item="selectedItem"
md-search-text-change="searchTextChange()"
md-search-text="searchText"
md-selected-item-change="selectedItemChange(item)"
md-items="item in Person"
md-item-text="item.Name"
md-min-length="0"
placeholder="Which is your favorite Person?">
<md-item-template>
<span md-highlight-text="ctrl.searchText" md-highlight-flags="^i">{{item.country}}</span>
</md-item-template>
<md-not-found>
No Person matching "{{searchText}}" were found.
</md-not-found>
</md-autocomplete>
<br/>
</div>
<script>
var app = angular.module('myApp', ['ngMaterial']);
app.controller('myCtrl', function ($scope, $http, $q) {
$scope.searchText = "";
$scope.Person = [];
$scope.selectedItem = [];
$scope.isDisabled = false;
$scope.noCache = false;
$scope.selectedItemChange = function (item) {
alert("Item Changed");
}
$scope.searchTextChange = function () {
$http({
method: "POST",
url: "https://www.bbminfo.com/sample.php",
params: {
token: $scope.searchText
}
})
.success(function (response) {
$scope.Person = response.records;
});
}
});
</script>
</body>
</html>In Scenario 1, I used the function to fetch the filtered list md-items="item in querySearch(searchText)". But in Scenario 2, I used a $scope variable md-items="item in Person"
Kindly refer the Snapshots
Snapshot 1:
Here I'm searching for indian but it shows the result for india. I debugged the issue in Firefox Browser Firebug, see the above Snapshot 1 it shows, the request was sent for the search term indian via POST Method and I got the response of one matching items as a JSON Object successfully, which is shown in the bottom of SnapShot 1
The issue I find out in this case, the Values can't be returned before a promise is resolved
Steps I tried:
Case 1: I used the AngularJS filter in UI md-items="item in Person | filter: searchText", it gives the filtered list of previously fetched remote data not a currently fetched remote data. While on Backspacing the character in the textbox it shows the improper suggestion list.
Case 2: I tried to update the changes in UI by calling $scope.$apply() within a $http service, but it fails. Because $http service calling the $scope.$apply() by default, show it throws me an error Error: [$rootScope:inprog].... Finally in this attempt I failed.
Case 3: I created a function, within the function I'm manually called the $scope.$apply(), within the function I manually pushed and poped one dummy item to the $scope variable which is bind in the md-autocomplete. But I failed in this attempt. Because here also I got a same output as same as in the snapshot.
function Ctrlm($scope) {
$scope.messageToUser = "You are done!";
setTimeout(function () {
$scope.$apply(function () {
$scope.dummyCntry = [
{
sno: 0,
country: ""
},
];
$scope.Person.push($scope.dummyCntry);
var index = $scope.Person.indexOf($scope.dummyCntry);
$scope.Person.splice(index, 1);
});
}, 10);
}
Case 4: I did the same approach as like "Case 3" within the $scope.$watchCollection. Here also I got a setback.
$scope.$watchCollection('Person', function (newData, oldDaata) {
$scope.dummyCntry = [
{
sno: 0,
country: ""
},
];
newData.push($scope.dummyCntry);
var index = newData.indexOf($scope.dummyCntry);
newData.splice(index, 1);
});
Case 5: Instead of $http service, I used the jquery ajax call. In that I used the $scope.apply() to update the UI manually. I failed in this attempt once again, here also I got the same output.
$scope.searchTextChange = function () {
if (($scope.searchText != undefined) && ($scope.searchText != null)) {
$.ajax({
type: 'GET',
url: "https://www.bbminfo.com/sample.php?token=" + $scope.searchText,
success: function (response) {
$scope.$apply(function () {
$scope.Person = response.records;
});
},
error: function (data) {
$scope.$apply(function () {
$scope.Person = [];
});
},
async: true
});
} else {
$scope.Person = [];
}
}
In all the attempts I can't able to fix the issue.
@georgeawg https://stackoverflow.com/users/5535245/georgeawg suggested me to post a new question, he stated, "write a new question that describes what you are actually trying to accomplish, include the desired behavior, a summary of the work you've done so far to solve the problem, and a description of the difficulty you are having solving it."
Reference Questions which I was posted in the earlier
My Requirement: I need an updated Suggestion List using remote data sources in Angular Material
md-autocomplete- Ajax$httpservice.
Kindly assist me in this regards.
For Testing Purpose Use the following Source Code
Use the following URL for Remote Data Source: https://bbminfo.com/sample.php?token=ind
The Remote Data Source URL contains the List of Countries Name.
Directly Test the Code by click the below Run Code Snippet button.
Complete HTML with AngularJS Source Code:
<!DOCTYPE html>
<html>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.css">
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-animate.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-aria.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-messages.min.js"></script>
<!-- Angular Material Library -->
<script src="http://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<p>Country to Select:</p>
<md-content>
<md-autocomplete
ng-disabled="isDisabled"
md-no-cache="noCache"
md-selected-item="selectedItem"
md-search-text-change="searchTextChange()"
md-search-text="searchText"
md-selected-item-change="selectedItemChange(item)"
md-items="item in Person"
md-item-text="item.country"
md-min-length="0"
placeholder="Which is your favorite Country?">
<md-item-template>
<span md-highlight-text="searchText" md-highlight-flags="^i">{{item.country}}</span>
</md-item-template>
<md-not-found>
No Person matching "{{searchText}}" were found.
</md-not-found>
</md-autocomplete>
</md-content>
<br/>
</div>
<script>
var app = angular.module('myApp', ['ngMaterial']);
app.controller('myCtrl', function ($scope, $http, $q) {
$scope.searchText = "";
$scope.Person = [];
$scope.selectedItem = [];
$scope.isDisabled = false;
$scope.noCache = false;
$scope.selectedItemChange = function (item) {
alert("Item Changed");
}
$scope.searchTextChange = function () {
$http({
method: "post",
url: "https://www.bbminfo.com/sample.php",
params: {
token: $scope.searchText
}
})
.success(function (response) {
$scope.Person = response.records;
});
}
});
</script>
</body>
</html>
