I am currently working with the following directive in my select.
ng-options="option.value as option.title for option in exportTypes"The array $scope.exportTypes contains objects with attributes title, value, and generatesFile. I would like to include the generatesFile attribute as a data-generates-file attribute on each <option> generated for this select element.
Could you provide any advice on how to accomplish this task?
Perhaps someone will correct me, but I believe achieving this level of control with ng-options may not be possible. Angular typically handles the select element for you when using ng-options, which is convenient most of the time but may limit flexibility in certain scenarios. While I'm unsure about the specific benchmarks you're referring to, I would venture to say that utilizing ng-repeat on the option elements could offer similar performance compared to using ng-options.
You might consider implementing something like the following:
<select ng-model="selectedExportType">
<option ng-repeat="exportType in exportTypes" data-generates-file="{{exportType.generatesFile}}" value="{{exportType.value}}">
{{exportType.title}}
</option>
</select>
However, this approach assumes the necessity of having that attribute present. If your only requirement is accessing that attribute within the select element, then utilizing ng-options proves advantageous. By removing the option.value as portion from your select statement, you receive the entire object back from your array upon selection.
http://plnkr.co/edit/6XPaficTbbzozSQqo6uE?p=preview
In the provided demo, you can observe that the selected item comprises the complete object, inclusive of the someAttr property that was never utilized in the select element. This property remains hidden upon inspecting the DOM, as Angular manages these details internally.
Here is a custom directive that allows you to add additional attributes when using ng-options with <select>, eliminating the need for ng-repeat
.directive('optionsCustomAttr', function ($parse) {
return {
priority: 0,
require: 'ngModel',
link: function (scope, iElement, iAttrs) {
scope.addCustomAttr = function (attr, element, data, fnDisableIfTrue) {
$("option", element).each(function (i, e) {
var locals = {};
locals[attr] = data[i];
$(e).attr(iAttrs.customAttrName ? iAttrs.customAttrName : 'custom-attr', fnDisableIfTrue(scope, locals));
});
};
var expElements = iAttrs['optionsCustomAttr'].match(/(.+)\s+for\s+(.+)\s+in\s+(.+)/);
var attrToWatch = expElements[3];
var fnDisableIfTrue = $parse(expElements[1]);
scope.$watch(attrToWatch, function (newValue) {
if (newValue)
scope.addCustomAttr(expElements[2], iElement, newValue, fnDisableIfTrue);
});
}
};
})
In your HTML select element,
<select ng-model="selectedExportType" ng-options="option.value as option.title for option in exportTypes"
options-custom-attr="option.generatesFile for option in exportTypes"
custom-attr-name="data-generates-file">
</select>
Note: This directive is based on the concept of optionsDisabled mentioned in this thread
Here's a more streamlined approach:
<select ng-model="selectedItem" ng-options="item as item.name for item in items" option-style="items"></select>
A custom directive can be used to modify the style of each option tag.
angular.directive('optionStyle', function ($compile, $parse) {
return {
restrict: 'A',
priority: 10000,
link: function optionStylePostLink(scope, elem, attrs) {
var allItems = scope[attrs.optionStyle];
var options = elem.find("option");
for (var i = 0; i < options.length; i++) {
angular.element(options[i]).css("color", allItems[i].yourWantedValue);
}
}
};
});
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