Substituting missing data with the string "null" using AngularJS

Question

Substituting missing data with the string "null" using AngularJS

I am struggling to display a table in an HTML page using ng-repeat. The issue arises when most of the entries in the table are null, as I am unable to replace them with either an empty space or the string "null". I attempted to use {{ row || 'null' }} but it did not provide the desired result. Whenever the table is generated, it becomes messy if there are a large number of null values present.

     <table>
        <tr>
            <th ng-repeat="colname in sqldata.collist">{{colname}}</th>
        </tr>
        <tr ng-repeat="rows in sqldata.tablist">
            <td ng-repeat="row in rows">{{ row || 'null' }}</td>
        </tr>
    </table>

https://i.sstatic.net/WQNJo.jpg

javascript angularjs

Answer 1

Answer №1

Have you tried using the classic ng-show and ng-hide technique to display content only if a value is 'null'?

Swap out

{{ row || 'null' }}

with

<div ng-show="row">{{row}}/div>
<div ng-hide="row">null</div>

Answer 2

Have you tried using the classic ng-show and ng-hide technique to display content only if a value is 'null'?

Swap out

{{ row || 'null' }}

with

<div ng-show="row">{{row}}/div>
<div ng-hide="row">null</div>

Answer 3

Answer №2

Opting for a filter is a superior choice. This approach eliminates the need for duplicate DOM elements, utilizing a hidden and shown element instead. It also ensures that your view remains free of excess logic.

Furthermore, implementing a filter standardizes the 'no data' message throughout your application, making it applicable to almost all data binding scenarios.

<div ng-app="test" ng-controller="ClientCtrl">
    <div ng-repeat="elem in elems">
        {{elem | isempty}}
    </div>
</div>

Your JavaScript code:

angular.module('test', []).filter('isempty', function() {
    return function(input) {
        return isEmpty(input) ? 'No Value' : input;
    };

    function isEmpty (i){
        return (i === null || i === undefined);
    }
})

Link to JSFiddle example: http://jsfiddle.net/5hqp5wxc/

Documentation: https://docs.angularjs.org/guide/filter

Answer 4

Opting for a filter is a superior choice. This approach eliminates the need for duplicate DOM elements, utilizing a hidden and shown element instead. It also ensures that your view remains free of excess logic.

Furthermore, implementing a filter standardizes the 'no data' message throughout your application, making it applicable to almost all data binding scenarios.

<div ng-app="test" ng-controller="ClientCtrl">
    <div ng-repeat="elem in elems">
        {{elem | isempty}}
    </div>
</div>

Your JavaScript code:

angular.module('test', []).filter('isempty', function() {
    return function(input) {
        return isEmpty(input) ? 'No Value' : input;
    };

    function isEmpty (i){
        return (i === null || i === undefined);
    }
})

Link to JSFiddle example: http://jsfiddle.net/5hqp5wxc/

Documentation: https://docs.angularjs.org/guide/filter

Answer 5

Answer №3

One alternative is using ng-if
 <table>
        <tr>
            <th ng-repeat="colname in sqldata.columns">{{colname}}</th>
        </tr>
        <tr ng-repeat="rows in sqldata.tablelist">
            <td ng-repeat="row in rows">
              <span ng-if="row" >{{ row }} </span>
              <span ng-if="!row" > empty </span>
            </td>
        </tr>
    </table>

Answer 6

One alternative is using ng-if
 <table>
        <tr>
            <th ng-repeat="colname in sqldata.columns">{{colname}}</th>
        </tr>
        <tr ng-repeat="rows in sqldata.tablelist">
            <td ng-repeat="row in rows">
              <span ng-if="row" >{{ row }} </span>
              <span ng-if="!row" > empty </span>
            </td>
        </tr>
    </table>

Substituting missing data with the string "null" using AngularJS

Answer №1

Answer №2

Answer №3

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