Angular ng-repeat add bootstrap row every 3 or 4 c

2019-01-02 19:58发布

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问题:

I'm looking for the right pattern to inject a bootstrap row class every each 3 columns. I need this because cols doesn't have a fixed hight (and I don't want to fix one), so it breaks my design !

Here is my code :

<div ng-repeat="product in products">
    <div ng-if="$index % 3 == 0" class="row">
        <div class="col-sm-4" >
            ...
        </div>
    </div>
</div>

But it does only display one product in each row. What I want as final result is :

<div class="row">
    <div class="col-sm4"> ... </div>
    <div class="col-sm4"> ... </div>
    <div class="col-sm4"> ... </div>
</div>
<div class="row">
    <div class="col-sm4"> ... </div>
    <div class="col-sm4"> ... </div>
    <div class="col-sm4"> ... </div>
</div>

Can I achieve this with only ng-repeat pattern (without directive or controller) ? The docs introduce ng-repeat-start and ng-repeat-end but I can't figure out how to use it is this use case ! I feel like this is something we often use in bootstrap templating ! ? Thanks

回答1:

The top voted answer, while effective, is not what I would consider to be the angular way, nor is it using bootstrap's own classes that are meant to deal with this situation. As @claies mentioned, the .clearfix class is meant for situations such as these. In my opinion, the cleanest implementation is as follows:

<div class="row">
    <div ng-repeat="product in products">
        <div class="clearfix" ng-if="$index % 3 == 0"></div>
        <div class="col-sm-4">
            <h2>{{product.title}}</h2>
        </div>
    </div>
</div>

This structure avoids messy indexing of the products array, allows for clean dot notation, and makes use of the clearfix class for its intended purpose.

回答2:

I know it's a bit late but it still might help someone. I did it like this:

<div ng-repeat="product in products" ng-if="$index % 3 == 0" class="row">
    <div class="col-xs-4">{{products[$index]}}</div>
    <div class="col-xs-4" ng-if="products.length > ($index + 1)">{{products[$index + 1]}}</div>
    <div class="col-xs-4" ng-if="products.length > ($index + 2)">{{products[$index + 2]}}</div>
</div>

jsfiddle

回答3:

Okay, this solution is far simpler than the ones already here, and allows different column widths for different device widths.

<div class="row">
    <div ng-repeat="image in images">
        <div class="col-xs-6 col-sm-4 col-md-3 col-lg-2">
            ... your content here ...
        </div>
        <div class="clearfix visible-lg" ng-if="($index + 1) % 6 == 0"></div>
        <div class="clearfix visible-md" ng-if="($index + 1) % 4 == 0"></div>
        <div class="clearfix visible-sm" ng-if="($index + 1) % 3 == 0"></div>
        <div class="clearfix visible-xs" ng-if="($index + 1) % 2 == 0"></div>
    </div>
</div>

Note that the % 6 part is supposed to equal the number of resulting columns. So if on the column element you have the class col-lg-2 there will be 6 columns, so use ... % 6.

This technique (excluding the ng-if) is actually documented here: Bootstrap docs

回答4:

While what you want to accomplish may be useful, there is another option which I believe you might be overlooking that is much more simple.

You are correct, the Bootstrap tables act strangely when you have columns which are not fixed height. However, there is a bootstrap class created to combat this issue and perform responsive resets.

simply create an empty <div class="clearfix"></div> before the start of each new row to allow the floats to reset and the columns to return to their correct positions.

here is a bootply.

回答5:

Thanks for your suggestions, you got me on the right way !

Let's go for a complete explanation :

By default AngularJS http get query returns an object
So if you want to use @Ariel Array.prototype.chunk function you have first to transform object into an array.

And then to use the chunk function IN YOUR CONTROLLER otherwise if used directly into ng-repeat, it will brings you to an infdig error. The final controller looks :

// Initialize products to empty list
$scope.products = [];

// Load products from config file
$resource("/json/shoppinglist.json").get(function (data_object)
{
    // Transform object into array
    var data_array =[];
    for( var i in data_object ) {
        if (typeof data_object[i] === 'object' && data_object[i].hasOwnProperty("name")){
            data_array.push(data_object[i]);
        }
    }
    // Chunk Array and apply scope
    $scope.products = data_array.chunk(3);
});

And HTML becomes :

<div class="row" ng-repeat="productrow in products">

    <div class="col-sm-4" ng-repeat="product in productrow">

On the other side, I decided to directly return an array [] instead of an object {} from my JSON file. This way, controller becomes (please note specific syntax isArray:true) :

    // Initialize products to empty list 
    $scope.products = [];

    // Load products from config file
    $resource("/json/shoppinglist.json").query({method:'GET', isArray:true}, function (data_array)
    {
        $scope.products = data_array.chunk(3);
    });

HTML stay the same as above.

OPTIMIZATION

Last question in suspense is : how to make it 100% AngularJS without extending javascript array with chunk function ... if some people are interested in showing us if ng-repeat-start and ng-repeat-end are the way to go ... I'm curious ;)

ANDREW'S SOLUTION

Thanks to @Andrew, we now know adding a bootstrap clearfix class every three (or whatever number) element corrects display problem from differents block's height.

So HTML becomes :

<div class="row">

    <div ng-repeat="product in products">

        <div ng-if="$index % 3 == 0" class="clearfix"></div>

        <div class="col-sm-4"> My product descrition with {{product.property}}

And your controller stays quite soft with removed chunck function :

// Initialize products to empty list 
        $scope.products = [];

        // Load products from config file
        $resource("/json/shoppinglist.json").query({method:'GET', isArray:true}, function (data_array)
        {
            //$scope.products = data_array.chunk(3);
            $scope.products = data_array;
        });

回答6:

Based on Alpar solution, using only templates with anidated ng-repeat. Works with both full and partially empty rows:

<div data-ng-app="" data-ng-init="products='soda','beer','water','milk','wine']" class="container">
    <div ng-repeat="product in products" ng-if="$index % 3 == 0" class="row">
        <div class="col-xs-4" 
            ng-repeat="product in products.slice($index, ($index+3 > products.length ? 
            products.length : $index+3))"> {{product}}</div>
    </div>
</div>

JSFiddle

回答7:

You can do it without a directive but i'm not sure it's the best way. To do this you must create array of array from the data you want to display in the table, and after that use 2 ng-repeat to iterate through the array.

to create the array for display use this function like that products.chunk(3)

Array.prototype.chunk = function(chunkSize) {
    var array=this;
    return [].concat.apply([],
        array.map(function(elem,i) {
            return i%chunkSize ? [] : [array.slice(i,i+chunkSize)];
        })
    );
}

and then do something like that using 2 ng-repeat

<div class="row" ng-repeat="row in products.chunk(3)">
  <div class="col-sm4" ng-repeat="item in row">
    {{item}}
  </div>
</div>

回答8:

I've just made a solution of it working only in template. The solution is

    <span ng-repeat="gettingParentIndex in products">
        <div class="row" ng-if="$index<products.length/2+1">    <!-- 2 columns -->
            <span ng-repeat="product in products">
                <div class="col-sm-6" ng-if="$index>=2*$parent.$index && $index <= 2*($parent.$index+1)-1"> <!-- 2 columns -->
                    {{product.foo}}
                </div>
            </span>
        </div>
    </span>

Point is using data twice, one is for an outside loop. Extra span tags will remain, but it depends on how you trade off.

If it's a 3 column layout, it's going to be like

    <span ng-repeat="gettingParentIndex in products">
        <div class="row" ng-if="$index<products.length/3+1">    <!-- 3 columns -->
            <span ng-repeat="product in products">
                <div class="col-sm-4" ng-if="$index>=3*$parent.$index && $index <= 3*($parent.$index+1)-1"> <!-- 3 columns -->
                    {{product.foo}}
                </div>
            </span>
        </div>
    </span>

Honestly I wanted

$index<Math.ceil(products.length/3)

Although it didn't work.

回答9:

Just another little improvement about @Duncan answer and the others answers based on clearfix element. If you want to make the content clickable you will need a z-index > 0 on it or clearfix will overlap the content and handle the click.

This is the example not working (you can't see the cursor pointer and clicking will do nothing):

<div class="row">
    <div ng-repeat="product in products">
        <div class="clearfix" ng-if="$index % 3 == 0"></div>
        <div class="col-sm-4" style="cursor: pointer" ng-click="doSomething()">
            <h2>{{product.title}}</h2>
        </div>
    </div>
</div>

While this is the fixed one:

<div class="row">
    <div ng-repeat-start="product in products" class="clearfix" ng-if="$index % 3 == 0"></div>
    <div ng-repeat-end class="col-sm-4" style="cursor: pointer; z-index: 1" ng-click="doSomething()">
            <h2>{{product.title}}</h2>
    </div>
</div>

I've added z-index: 1 to have the content raise over the clearfix and I've removed the container div using instead ng-repeat-start and ng-repeat-end (available from AngularJS 1.2) because it made z-index not working.

Hope this helps!

Update

Plunker: http://plnkr.co/edit/4w5wZj

回答10:

i solved this using ng-class

<div ng-repeat="item in items">
    <div ng-class="{ 'row': ($index + 1) % 4 == 0 }">
        <div class="col-md-3">
            {{item.name}}
        </div>
    </div>
</div>

回答11:

The best way to apply a class is to use ng-class.It can be used to apply classes based on some condition.

<div ng-repeat="product in products">
   <div ng-class="getRowClass($index)">
       <div class="col-sm-4" >
           <!-- your code -->
       </div>
   </div>

and then in your controller

$scope.getRowClass = function(index){
    if(index%3 == 0){
     return "row";
    }
}

回答12:

Little bit modification in @alpar 's solution

<div data-ng-app="" data-ng-init="products=['A','B','C','D','E','F', 'G','H','I','J','K','L']" class="container">
    <div ng-repeat="product in products" ng-if="$index % 6 == 0" class="row">
        <div class="col-xs-2" ng-repeat="idx in [0,1,2,3,4,5]">
        {{products[idx+$parent.$index]}} <!-- When this HTML is Big it's useful approach -->
        </div>
    </div>
</div>

jsfiddle

回答13:

After combining many answers and suggestion here, this is my final answer, which works well with flex, which allows us to make columns with equal height, it also checks the last index, and you don't need to repeat the inner HTML. It doesn't use clearfix:

<div ng-repeat="prod in productsFiltered=(products | filter:myInputFilter)" ng-if="$index % 3 == 0" class="row row-eq-height">
    <div ng-repeat="i in [0, 1, 2]" ng-init="product = productsFiltered[$parent.$parent.$index + i]"  ng-if="$parent.$index + i < productsFiltered.length" class="col-xs-4">
        <div class="col-xs-12">{{ product.name }}</div>
    </div>
</div>

It will output something like this:

<div class="row row-eq-height">
    <div class="col-xs-4">
        <div class="col-xs-12">
            Product Name
        </div>
    </div>
    <div class="col-xs-4">
        <div class="col-xs-12">
            Product Name
        </div>
    </div>
    <div class="col-xs-4">
        <div class="col-xs-12">
            Product Name
        </div>
    </div>
</div>
<div class="row row-eq-height">
    <div class="col-xs-4">
        <div class="col-xs-12">
            Product Name
        </div>
    </div>
    <div class="col-xs-4">
        <div class="col-xs-12">
            Product Name
        </div>
    </div>
    <div class="col-xs-4">
        <div class="col-xs-12">
            Product Name
        </div>
    </div>
</div>

回答14:

This worked for me, no splicing or anything required:

HTML

<div class="row" ng-repeat="row in rows() track by $index">
    <div class="col-md-3" ng-repeat="item in items" ng-if="indexInRange($index,$parent.$index)"></div>
</div>

JavaScript

var columnsPerRow = 4;
$scope.rows = function() {
  return new Array(columnsPerRow);
};
$scope.indexInRange = function(columnIndex,rowIndex) {
  return columnIndex >= (rowIndex * columnsPerRow) && columnIndex < (rowIndex * columnsPerRow) + columnsPerRow;
};

回答15:

Born Solutions its best one, just need a bit tweek to feet the needs, i had different responsive solutions and changed a bit

<div ng-repeat="post in posts">
    <div class="vechicle-single col-lg-4 col-md-6 col-sm-12 col-xs-12">
    </div>
    <div class="clearfix visible-lg" ng-if="($index + 1) % 3 == 0"></div>
    <div class="clearfix visible-md" ng-if="($index + 1) % 2 == 0"></div>
    <div class="clearfix visible-sm" ng-if="($index + 1) % 1 == 0"></div>
    <div class="clearfix visible-xs" ng-if="($index + 1) % 1 == 0"></div>
</div>

回答16:

Try this Example

<!DOCTYPE html>
<html>
<head>
	<title></title>

	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular.min.js"></script>
	<script type="text/javascript">
		var app = angular.module('myApp', []);

		app.controller('myCtrl', function ($scope,$filter) {
			$scope.products =[{
				id:1,
				name:'aa',
			},{
				id:2,
				name:'bb',
			},{
				id:3,
				name:'cc',
			},{
				id:4,
				name:'dd',
			},{
				id:5,
				name:'ee',
			}];
		});

	</script>
</head>
<body ng-app="myApp">
	<div ng-controller="myCtrl">
		<div ng-repeat="product in products" ng-if="$index % 3 == 0" class="row">
			<div class="col-xs-4">{{products[$index]}}</div>
			<div class="col-xs-4" ng-if="products.length > ($index + 1)">{{products[$index + 1]}}</div>
			<div class="col-xs-4" ng-if="products.length > ($index + 2)">{{products[$index + 2]}}</div>
		</div>
	</div>
</body>
</html>

回答17:

Building on Alpar's answer, here's a more generalised way to split a single list of items into multiple containers (rows, columns, buckets, whatever):

<div class="row" ng-repeat="row in [0,1,2]">
  <div class="col" ng-repeat="item in $ctrl.items" ng-if="$index % 3 == row">
    <span>{{item.name}}</span>
  </div>
</div>

for a list of 10 items, generates:

<div class="row">
  <div class="col"><span>Item 1</span></div>
  <div class="col"><span>Item 4</span></div>
  <div class="col"><span>Item 7</span></div>
  <div class="col"><span>Item 10</span></div>
</div> 
<div class="row">
  <div class="col"><span>Item 2</span></div>
  <div class="col"><span>Item 5</span></div>
  <div class="col"><span>Item 8</span></div>
</div> 
<div class="row">
  <div class="col"><span>Item 3</span></div>
  <div class="col"><span>Item 6</span></div>
  <div class="col"><span>Item 9</span></div>
</div>

The number of containers can be quickly coded into a controller function:

JS (ES6)

$scope.rowList = function(rows) {
  return Array(rows).fill().map((x,i)=>i);
}
$scope.rows = 2;

HTML

<div class="row" ng-repeat="row in rowList(rows)">
  <div ng-repeat="item in $ctrl.items" ng-if="$index % rows == row">
    ...

This approach avoids duplicating the item markup (<span>{{item.name}}</span> in this case) in the source template - not a huge win for a simple span, but for a more complex DOM structure (which I had) this helps keep the template DRY.

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