ng-options how to set first select always blank
JavascriptAngularjsOptionsJavascript Problem Overview
I am using angularjs in a project and in which I am using ng-options for generating
Javascript Solutions
Solution 1 - Javascript
This will do the work for you:
<select size="3" ng-model="item" ng-options="s.name for s in itemlist">
<option value="">Select Option</option>
</select>
Solution 2 - Javascript
For anyone out there that treat "null" as valid value for one of the options (so imagine that "null" is a value of one of the items in typeOptions in example below), I found that simplest way to make sure that automatically added option is hidden is to use ng-if.
<select ng-options="option.value as option.name for option in typeOptions">
<option value="" ng-if="false"></option>
</select>
Why ng-if and not ng-hide? Because you want css selectors that would target first option inside above select to target "real" option, not the one that's hidden. It gets useful when you're using protractor for e2e testing and (for whatever reason) you use by.css() to target select options.
Kevin - Sưu Tầm
Solution 3 - Javascript
You can forgo using the ng-options and use ng-repeat instead and make the first option blank. See example below.
<select size="3" ng-model="item">
<option value="?" selected="selected"></option>
<option ng-repeat="s in itemlist" value="{{s.value}}">{{s.name}}</option>
</select>
Solution 4 - Javascript
It appears that your best option would be to have the blank item included as the first item in itemlist.
Solution 5 - Javascript
The solution above will corrupt the model with junk data. Please use the directive to reset the model in the right way JS:
Directive"
.directive('dropDown', function($filter) {
return {
require: 'ngModel',
priority: 100,
link: function(scope, element, attr, ngModel) {
function parse(value) {
if (value) {
if(value === "")
{
return "crap"
}
else
{
return value;
}
} else {
return;
}
}
ngModel.$parsers.push(parse);
}
};
});
Solution 6 - Javascript
I had same problem and after a lot of googling,I understood the main issue was related to my angular version, if you use Angular 1.6.x, just use the ng-value directive and it will work as expected.
also I set an initial value in my controller, like this :
$scope.item = 0;
Solution 7 - Javascript
<select ng-model="dataItem.platform_id"
ng-options="item.id as item.value for item in platformList"
ng-init="dataItem.platform_id=dataItem.platform_id||platformList[0].id"></select>
Solution 8 - Javascript
Controller
$scope.item = '';
$scope.itemlist = {
'' = '',
'Item 0' = 1,
'Item 1' = 2,
'Item 2' = 3
};
HTML
<select data-ng-model="item" data-ng-options="v as k for (k, v) in itemlist"></select>