Angular.js: How to change div width based on user input

Question

I have an input box which accepts the value for div width. Using angular.js, How can you change div's width based on user input? I have implemented following code after referring this fiddle.http://jsfiddle.net/311chaos/vUUf4/4/

Markup:

 <input type="text" id="gcols" placeholder="Number of Columns" ng-model="cols" ng-change="flush()"/>

<div getWidth rowHeight=cols ng-repeat="div in divs">{{$index+1}} aaaaaa</div>

controller.js

var grid = angular.module('gridApp', []);

grid.controller('control', ['$scope', function ($scope) {

    /* code for repeating divs based on input*/
    $scope.divs = new Array();
    $scope.create=function(){ //function invoked on button's ng-click
            var a = $scope.cols;
            for(i=0;i<a;i++)
            {
                $scope.divs.push(a);
            }
            alert($scope.divs);
        };


}]);

grid.directive('getWidth', function () {
    return {
        restrict: "A",
        scope: {
            "rowHeight": '='
        },
        link: function (scope, element) {

            scope.$watch("rowHeight", function (value) {
                console.log(scope.rowHeight);
                $(element).css('width', scope.rowHeight + "px");
            }, false);
        }
    }
});

function appCtrl($scope) {
    $scope.cols = 150;   //just using same input value to check if working


}

UPDATE My ultimate goal is to set width of that div. When I call inline CSS like following I achieve what I want.

<div get-width row-height="{{cols}}" ng-repeat="div in divs" style="width:{{cols}}px">{{$index+1}} aaaaaa</div>

But this wouldn't be always efficient if number of divs goes high. So, again question remains, how to do this via angular script?

Kristiyan Kostadinov · Accepted Answer · 2016-06-08 19:32:56Z

30

Use ng-style="{width: cols + 'px'}", instead of style.

link to the docs: http://docs.angularjs.org/api/ng.directive:ngStyle

edited Jun 8, 2016 at 19:32

answered Jan 4, 2014 at 12:22

Kristiyan Kostadinov

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3 Comments

Sujit Y. Kulkarni Over a year ago

I've read many times that, often writing inline style is not a good practice. So if your element is gonna be repeated 100 times, it wouldn't be a good practice. That's why I'm avoiding writing inline style here. Would it be ok, if you're using ng-style?

Kristiyan Kostadinov Over a year ago

Writing inline styles isn't usually a good practise but in this case this is the only thing that can be done to resize the element. As fro ng-style AFAIK it still add style="" but you can map scope variable to it so you could do something like ng-style="styles" and add the styles in the scope like: $scope.styles = {width: something + 'px'}

kcstricks Over a year ago

{{cols}} doesn't seem to work in newer Angular versions. If you're having this problem, try (cols) instead.

Nikola Nikolić · Accepted Answer · 2014-01-03 13:28:29Z

0

You have an error in yor angular syntax. You Should use

ng-repeat="div in divs track by $index"

Also you should use attrs.$observe instead of $watch.

Working demo (updated): http://jsfiddle.net/nidzix/UKHyL/40/

edited Jan 3, 2014 at 13:28

answered Jan 3, 2014 at 12:43

Nikola Nikolić

3662 silver badges17 bronze badges

5 Comments

Sujit Y. Kulkarni Over a year ago

strange. That is working in fiddle. But not when brought into my code. When i don't write 'track by' it works fine, else does not.

Nikola Nikolić Over a year ago

Did you properly include angular library, controller and app name?

Sujit Y. Kulkarni Over a year ago

Yes definitely. Script is called properly, otherwise rest of code wouldn't have worked. Controller and app name is also fine. But I've placed directive after controller, is that fine?

Nikola Nikolić Over a year ago

Yes, it doesn't matter. Fiddle is completely transparent, so there is no hidden code, and simple copy paste should be working. If you have other changes in your code they can have also impact to the result.

Sujit Y. Kulkarni Over a year ago

Hey sorry for late reply. Thing is, I c/ped your fiddle as it is. So on my local, when I remove 'track by $index' part, it works fine. But when I remove the same part while on fiddle, it doesn't react. And vice-a-verse.

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