Page selector with external pagination should not reload page with every keystroke

[bayy]

Version: ui-grid - v3.0.0-RC.18-d9b2314 - 2015-01-06

I have useExternalPagination set to true. With the current implementation, if I want to go to page 123, when I input 2 after 1, the page 12 is loaded, and then I can type in 3, which loads page 123.

I also have difficulty in loading page 23 directly, because I cannot just delete 1 and then put in 23 without triggering page reload. I have to go through reloading of page 1, 12, 2, and 23 to get to page 23.

Basically the problem is that the page should not be reloaded with every keystroke.

[PaulL1]

@brianchance: any thoughts on this?

[brianchance]

Could use ngModelOptions and debounce, but that is a 1.3 only feature. Could supply your own pager template with it on if using 1.3.

Otherwise, I guess you would need to tab off, but that behavior may not be expected or use a custom directive to implement the debounce.

[bayy]

Maybe, a new button such as 'Go'/'Goto Page' can be added, and only when this button is clicked with a valid input number, the new page will be loaded. This may be better than the debounce solution, since with debounce with a timeout value, it is still possible that the page reload happens before the customer finishes entering the number.

Just a suggestion.

[brianchance]

This pager panel has an ng-model-options for debounce (250), add to an app.run. You will need the latest unstable release that merged paging and pagination. You could also use the ng-model-option updateOn: 'blur' so it updates when they tab off.

$templateCache.put('ui-grid/pagination',
  "<div class=\"ui-grid-pager-panel\" ui-grid-pager ng-show=\"grid.options.enablePaginationControls\"><div class=\"ui-grid-pager-container\"><div class=\"ui-grid-pager-control\"><button type=\"button\" ng-click=\"paginationApi.seek(1)\" ng-disabled=\"cantPageBackward()\"><div class=\"first-triangle\"><div class=\"first-bar\"></div></div></button> <button type=\"button\" ng-click=\"paginationApi.previousPage()\" ng-disabled=\"cantPageBackward()\"><div class=\"first-triangle prev-triangle\"></div></button> <input type=\"number\" ng-model=\"grid.options.paginationCurrentPage\" min=\"1\" ng-model-options=\"{ debounce: 250 }\" max=\"{{ paginationApi.getTotalPages() }}\" required> <span class=\"ui-grid-pager-max-pages-number\" ng-show=\"paginationApi.getTotalPages() > 0\">/ {{ paginationApi.getTotalPages() }}</span> <button type=\"button\" ng-click=\"paginationApi.nextPage()\" ng-disabled=\"cantPageForward()\"><div class=\"last-triangle next-triangle\"></div></button> <button type=\"button\" ng-click=\"paginationApi.seek(paginationApi.getTotalPages())\" ng-disabled=\"cantPageToLast()\"><div class=\"last-triangle\"><div class=\"last-bar\"></div></div></button></div><div class=\"ui-grid-pager-row-count-picker\"><select ng-model=\"grid.options.paginationPageSize\" ng-options=\"o as o for o in grid.options.paginationPageSizes\"></select><span class=\"ui-grid-pager-row-count-label\">&nbsp;{{sizesLabel}}</span></div></div><div class=\"ui-grid-pager-count-container\"><div class=\"ui-grid-pager-count\"><span ng-show=\"grid.options.totalItems > 0\">{{showingLow}} - {{showingHigh}} of {{grid.options.totalItems}} {{totalItemsLabel}}</span></div></div></div>"
);

If you wanted to add a button, bind the text box to a temporary model (say grid.options.tempPaginationCurrentPage), then use the paginationApi.seek(page) function in the onclick of the button, passing the temporary value.

[npoirey]

Another possibility until an option is added is doing something like that, less likely to break in my opinion.
This update the grid on blur or "enter" keypress.

In an app.run

 //update the template cache so that we can trigger the pagination change only on enter or blur
 function updateGridPaginationTemplate(){
   var paginationTemplate = $templateCache.get('ui-grid/pagination');
   $templateCache.put('ui-grid/pagination',
     paginationTemplate.replace('class="ui-grid-pager-control-input"', 'class="ui-grid-pager-control- input" update-on-enter ng-model-options="{updateOn: \'blur\'}"'));
 }

and somewhere in your app declare the directive to update on enter:

angular.module('app').directive('updateOnEnter', function() {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function(scope, element, attrs, ctrl) {
            element.bind("keyup", function(ev) {
                if (ev.keyCode == 13) {
                    ctrl.$commitViewValue();
                    scope.$apply(ctrl.$setTouched);
                }
            });
        }
    }
});