I am reverse ordering some number strings with the orderBy directive that can be used in conjunction with ngRepeat.
<div ng-repeat="item in standings| orderBy:['-points', '-gd', 'team_name']">
<p>{{item.gd}}
</div>
So it is ordering (in order of priority) 'points', then 'gd' (goal difference), then 'team_name' (alphabetically).
The gd value correctly orders by descending value. The problem I have is with negative number values. In this instance, numbers are returned as strings, and the orderBy function doesn't understand "-2" as being less than "-1", but the opposite.
How can I get ng-repeat to parse the number values into integers, particularly to solve this ordering issue with minus numbers?
I considered making a filter, e.g: {{item.gd | *filterHere* }}, but this wouldn't be seen by the initial ng-repeat directive, which needs to take the source value as an integer.
Any help would be appreciated.
UPDATE:
I tried this filter, but when I call it in my ng-repeat, it returns nothing:
app.filter('stringToInteger', function() {
return function(input) {
angular.forEach(input, function(value) {
parseInt(value.gd);
})
};
return input;
});
In the View:
<p ng-repeat="item in standings | orderBy: '-gd' | stringToInteger">GD = {{item.gd}}</p>
the filter should be like this.
app.filter('stringToInteger', function() {
return function(input) {
angular.forEach(input, function(value) {
value.gd = parseInt(value.gd);
})
return input;
};
});
Use it like this .
<tr ng-repeat="team in teams | stringToInteger | orderBy:'-gd'">
Plunker link for more reference.
https://plnkr.co/edit/GRfMJnRdT1Gu5RXO9elA?p=preview
Related
My best attempts at finding a solution to this have come up empty. Basically I want to do something like this in my html:
<div data-ng-repeat="tag in allTags">
<h3>{{tag}}</h3>
<uib-accordion>
<div uib-accordion-group data-ng-repeat="item in displayItems | filter: tagFilter: tag">
tagFilter looks like this:
$scope.tagFilter = function(item, tag) {
if(item.tags.indexOf(tag) === -1) {
return false;
}
return true;
}
Each item in displayItems is an object that has an array of tags, so display items looks something like this:
[
{ title: "Item 1 Title", body: "Some escaped HTML Content", tags: ["tag1", "tag2", "tag3"]},
{ title: "Item 2 Title", body: "Some escaped HTML Content", tags: ["tag2", "tag4"] }
]
and I want it to appear under all headings to which it belongs. The problem is I can't figure out how to properly pass the value of 'tag' to tagFilter. In the code above the parameter tag in codeFilter is just equal to 0 no matter what.
The problem here is actually in the semantics of the Filter syntax. More specifically, the syntax you're using above is for when you're defining an Angular Filter using the ngApp.filter(...) syntax... i.e., a filter that's registered for the entire application and can be used anywhere. In that scenario the 3rd parameter in your filter statement is the value you want to pass to the registered filter.
In your case, you're defining a filter function inside your controller which changes how the filter works. Specifically, you cannot pass dynamic values to a filter function inside a controller. When you use a function as the filter expression, it has the following signature:
function(value, index, array) {}
and then gets called in the filter statement just by the function name, so:
array|filter:filterfunction - with no params or parenthesis.
value is the value of the current item (in the array) being filtered, index is the index of that item in the array, and array is the whole array being filtered. You cannot "pass" a value to this expression, but you can use a controller or scope variable if it applies. In your case it doesn't because the value you want to filter on is inside a repeater.
To achieve what you want, you need to make your $scope.tagFilter into an actual Angular Filter, like so:
ngApp.filter('tagFilter', function($filter)
{
return function(items, searchValue)
{
// initialize array to return
var filtered = [];
angular.forEach(items, function(obj)
{
// use filter to find matching tags (3rd param means EXACT search - set to False for wildcard match)
var objFilter = ($filter("filter")(obj.tags, searchValue, true))[0];
// If a matching tag was found, add it to the filtered array
if (objFilter) filtered.push(obj);
});
return filtered;
};
});
The above assumes you've saved your angular.module(...) bootstrap to a variable named ngApp. Once this filter is registered, your current filter syntax should work as expected!
Assuming displayItems is an array,
<div uib-accordion-group data-ng-repeat="item in displayItems.filter(tagFilter(tag))" >
should do the trick.
Figured out a way to do this based on this blog post: https://toddmotto.com/everything-about-custom-filters-in-angular-js/
Basically I had to create my own custom filter rather than using angulars predicate filter
The Javascript:
ng.module('faq').filter(
'tagFilter', function() {
return function(items, tag) {
return items.filter(function(item) {
if(item.tags.indexOf(tag) === -1) {
return false;
}
return true;
});
}
}
)
The HTML:
<div uib-accordion-group data-ng-repeat="item in displayItems | tagFilter: tag">
Still don't know why the original version was not working, so if anyone can answer that 10 points to them.
I'm trying to filter data based on the select and input fields. Here is part of my code:
<select ng-change="students.changeValue(changeFilter)" ng-model="changeFilter">
<option ng-selected="true" value="name">Name</option>
<option value="age">Age</option>
</select>
<input ng-model="searchPhrase" />
name and age are example keys that I have. Here is my data generator structure:
<div ng-class="{breakLine: $index % 3 === 0}"
class="student-item col-md-4"
ng-repeat="s in students.studentsList | filter:{searchFilter: searchPhrase}">
The searchFilter is supposed to be a key that is set from a variable but it doesn't work. If I make there something like: filter:{name: searchPhrase} then it works because I have such keys in my data structures.
Here is a part of the controller:
.controller('StudentsListCtrl', ['$scope', function($scope) {
$scope.searchFilter = '';
this.changeValue = function(val) {
console.log(val); ---> gives key or age on change
$scope.searchFilter = val;
}
So when I manually write e.g.: | filter:{name: searchPhrase} then it works. But when I pass 'name' (i.e. the key) in a variable like: | filter:{searchFilter: searchPhrase} then it's broken...
How can I fix this?
You should use the last option described in filter documentation for the expression:
function(value, index, array): A predicate function can be used to write arbitrary filters. The function is called for each element of the array, with the element, its index, and the entire array itself as arguments.
In the controller, you define the predicate, e.g.
$scope.personFilter = function(person) {
// return true if this person should be displayed
// according to the defined filter
}
and use it in the ng-repeat filter, e.g.
<ul>
<li ng-repeat="p in persons | filter:personFilter">{{p.name}} ({{p.age}})</li>
</ul>
See the plunker for a demo. Note I choose age as a string to simplify the predicate function. You can refine it according to your needs.
Write a function in your $scope to generate the object that is passed to the filter:
$scope.getFilterObject = function() {
var filterObject = {};
filterObject[$scope.searchFilter] = $scope.searchPhrase;
return filterObject;
}
Use it as the argument in the filter:
ng-repeat="s in students.studentsList | filter:getFilterObject()"
I'm writing an Angular app that will read a magnetic stripe card from a USB device. When I swipe a test card, I get a string back containing the card number. For example, ;12345?, where 12345 is the card number.
The data my app uses doesn't include these "control characters", so I'd like to strip them out of the search string if the string starts with a ; and ends with a ?.
When I write a custom filter:
angular.module('app.filters', [])
.filter('stripcardcontrolcharacters', function() {
return function(text) {
if(text.substring(0, 1) === ";" && text.substring(text.length - 1) === "?") {
return text.substring(1, text.length - 1);
}
};
});
It fails because I'm ng-repeating over an array, and not the string that I've searched for.
How would I get what string I'm filtering for and strip the characters from it?
EDIT: Current suggestion is to use a filter to modify the array to ADD in the control characters so filter: can find it. I might go with that for now, but I'm still curious to know if you can write such a filter
You're passing the entire array to your filter via
ng-repeat="user in users | stripcardcontrolcharacters ...
If that's how you want it to work, you would need to treat it as an array, for example
return function(textArray) {
var invalidChars = /\D/g; // just an example
return textArray.map(text => {
console.log(text);
return text.replace(invalidChars, '');
});
}
You are probably applying the filter to the array, not the string itself.
Look at this example:
angular.module('test', [])
.controller('testController', function($scope){
$scope.names = ['John Doe', 'Jane Doe'];
})
// The test filter
.filter('strip', function(){
return function(str) {
return str.substring(1, str.length - 1);
};
});
And here is how to use it:
<body ng-app="test" ng-controller="testController">
<p ng-repeat="name in names">
{{name | strip }}
</p>
</body>
Note that I'm applying the filter where I use the value, not in the ng-repeat statement.
And here is the working plunker
I am having trouble ordering strings containing characters that are not in the English alphabet ( š,č,ž,..)
Here is the fiddle: http://fiddle.jshell.net/vhhgh/
The letters are from the Slovenian alphabet.
It's been a while, but I found other solution: fiddle
HTML:
<div ng-app='test'>
<h2>Users</h2>
<div ng-controller="UsersCtrl">
<ul>
<li ng-repeat="user in users | localeCompareString">
{{user.surname}} {{user.name}}
</li>
</ul>
</div>
</div>
JS:
(function(angular) {
'use strict';
var test=angular.module('test',[])
.controller('UsersCtrl', ['$scope',function($scope) {
$scope.users = [
{name:'Ben', surname:'Živkovič'},
{name:'Ken', surname:'AlGore'},
{name:'Erica', surname:'Červ'},
{name:'Jane', surname:'Šinigoj'},
{name:'Kevin', surname:'Sort'},
{name:'Roger', surname:'Willson'},
{name:'Kim', surname:'Zorro'}
];
}]).filter('localeCompareString',function(){
return function (items) {
//window.console.log(items);
items.sort(function (a, b) {
return a.surname.localeCompare(b.surname);
});
return items;
};
});
})(window.angular);
Ordering arrays of strings with "foreign" letters isn't as easy to do as you might think. Actally, it can be a right pain in the ... to get right. The problem boils down to the fact that the Unicode charset contains (pretty much) all charactrers in existance, so a universal lexicographical sorting isn't possible since different countries all have different ways they expect the sorting to be handled.
To get around this, I've found TCollator, a small library aiming at fixing that issue, very useful.
You can compare two strings with the String.localeCompare() method. It's then easy to create your own filter to sort your array:
MyApp.filter('myOrderBy', function () {
return function (array, property, reverse) {
var result = array.sort(function (object1, object2) {
if (angular.isUndefined(property)) {
return object1.localeCompare(object2);
}
return object1[property].localeCompare(object2[property]);
});
return reverse ? result.reverse() : result;
};
});
Starting from AngularJS 1.5.7, orderBy takes an optional comparator function. The docs contain an example involving a locale-sensitive comparator.
I have a set of tiles that display a certain number depending on which option is selected by the user. I would now like to implement a sort by whatever number is shown.
The code below shows how I've implemented it (by gettting/setting a value in the parent cards scope). Now, because the orderBy function takes a string, I tried to set a variable in the card scope called curOptionValue and sort by that, but it doesn't seem to work.
So the question becomes, how to I create a custom sort function?
<div ng-controller="aggViewport" >
<div class="btn-group" >
<button ng-click="setOption(opt.name)" ng-repeat="opt in optList" class="btn active">{{opt.name}}</button>
</div>
<div id="container" iso-grid width="500px" height="500px">
<div ng-repeat="card in cards" class="item {{card.class}}" ng-controller="aggCardController">
<table width="100%">
<tr>
<td align="center">
<h4>{{card.name}}</h4>
</td>
</tr>
<tr>
<td align="center"><h2>{{getOption()}}</h2></td>
</tr>
</table>
</div>
</div>
and controller :
module.controller('aggViewport',['$scope','$location',function($scope,$location) {
$scope.cards = [
{name: card1, values: {opt1: 9, opt2: 10}},
{name: card1, values: {opt1: 9, opt2: 10}}
];
$scope.option = "opt1";
$scope.setOption = function(val){
$scope.option = val;
}
}]);
module.controller('aggCardController',['$scope',function($scope){
$scope.getOption = function(){
return $scope.card.values[$scope.option];
}
}]);
Actually the orderBy filter can take as a parameter not only a string but also a function. From the orderBy documentation: https://docs.angularjs.org/api/ng/filter/orderBy):
function: Getter function. The result of this function will be sorted
using the <, =, > operator.
So, you could write your own function. For example, if you would like to compare cards based on a sum of opt1 and opt2 (I'm making this up, the point is that you can have any arbitrary function) you would write in your controller:
$scope.myValueFunction = function(card) {
return card.values.opt1 + card.values.opt2;
};
and then, in your template:
ng-repeat="card in cards | orderBy:myValueFunction"
Here is the working jsFiddle
The other thing worth noting is that orderBy is just one example of AngularJS filters so if you need a very specific ordering behaviour you could write your own filter (although orderBy should be enough for most uses cases).
The accepted solution only works on arrays, but not objects or associative arrays. Unfortunately, since Angular depends on the JavaScript implementation of array enumeration, the order of object properties cannot be consistently controlled. Some browsers may iterate through object properties lexicographically, but this cannot be guaranteed.
e.g. Given the following assignment:
$scope.cards = {
"card2": {
values: {
opt1: 9,
opt2: 12
}
},
"card1": {
values: {
opt1: 9,
opt2: 11
}
}
};
and the directive <ul ng-repeat="(key, card) in cards | orderBy:myValueFunction">, ng-repeat may iterate over "card1" prior to "card2", regardless of sort order.
To workaround this, we can create a custom filter to convert the object to an array, and then apply a custom sort function before returning the collection.
myApp.filter('orderByValue', function () {
// custom value function for sorting
function myValueFunction(card) {
return card.values.opt1 + card.values.opt2;
}
return function (obj) {
var array = [];
Object.keys(obj).forEach(function (key) {
// inject key into each object so we can refer to it from the template
obj[key].name = key;
array.push(obj[key]);
});
// apply a custom sorting function
array.sort(function (a, b) {
return myValueFunction(b) - myValueFunction(a);
});
return array;
};
});
We cannot iterate over (key, value) pairings in conjunction with custom filters (since the keys for arrays are numerical indexes), so the template should be updated to reference the injected key names.
<ul ng-repeat="card in cards | orderByValue">
<li>{{card.name}} {{value(card)}}</li>
</ul>
Here is a working fiddle utilizing a custom filter on an associative array: http://jsfiddle.net/av1mLpqx/1/
Reference: https://github.com/angular/angular.js/issues/1286#issuecomment-22193332
The following link explains filters in Angular extremely well. It shows how it is possible to define custom sort logic within an ng-repeat.
http://toddmotto.com/everything-about-custom-filters-in-angular-js
For sorting object with properties, this is the code I have used:
(Note that this sort is the standard JavaScript sort method and not specific to angular) Column Name is the name of the property on which sorting is to be performed.
self.myArray.sort(function(itemA, itemB) {
if (self.sortOrder === "ASC") {
return itemA[columnName] > itemB[columnName];
} else {
return itemA[columnName] < itemB[columnName];
}
});
To include the direction along with the orderBy function:
ng-repeat="card in cards | orderBy:myOrderbyFunction():defaultSortDirection"
where
defaultSortDirection = 0; // 0 = Ascending, 1 = Descending