问题
Is there any function or ng-something to check if any of the displayed Checkboxes are checked?
I have the values through the ng-click="function()" and pass the values through. I can go by foot and check my array if any value is inside.
I want to activate/deactivate the "next"-button if any Checkbox is checked.
What's the easiest way?
回答1:
You can do something like:
function ChckbxsCtrl($scope, $filter) {
$scope.chkbxs = [{
label: "Led Zeppelin",
val: false
}, {
label: "Electric Light Orchestra",
val: false
}, {
label: "Mark Almond",
val: false
}];
$scope.$watch("chkbxs", function(n, o) {
var trues = $filter("filter")(n, {
val: true
});
$scope.flag = trues.length;
}, true);
}
And a template:
<div ng-controller="ChckbxsCtrl">
<div ng-repeat="chk in chkbxs">
<input type="checkbox" ng-model="chk.val" />
<label>{{chk.label}}</label>
</div>
<div ng-show="flag">I'm ON when band choosed</div>
</div>
Working: http://jsfiddle.net/cherniv/JBwmA/
UPDATE: Or you can go little bit different way , without using $scope's $watch() method, like:
$scope.bandChoosed = function() {
var trues = $filter("filter")($scope.chkbxs, {
val: true
});
return trues.length;
}
And in a template do:
<div ng-show="bandChoosed()">I'm ON when band choosed</div>
Fiddle: http://jsfiddle.net/uzs4sgnp/
回答2:
If you don't want to use a watcher, you can do something like this:
<input type='checkbox' ng-init='checkStatus=false' ng-model='checkStatus' ng-click='doIfChecked(checkStatus)'>
回答3:
If you have only one checkbox, you can do this easily with just ng-model:
<input type="checkbox" ng-model="checked"/>
<button ng-disabled="!checked"> Next </button>
And initialize $scope.checked in your Controller (default=false). The official doc discourages the use of ng-init in that case.
回答4:
Try to think in terms of a model and what happens to that model when a checkbox is checked.
Assuming that each checkbox is bound to a field on the model with ng-model then the property on the model is changed whenever a checkbox is clicked:
<input type='checkbox' ng-model='fooSelected' />
<input type='checkbox' ng-model='baaSelected' />
and in the controller:
$scope.fooSelected = false;
$scope.baaSelected = false;
The next button should only be available under certain circumstances so add the ng-disabled directive to the button:
<button type='button' ng-disabled='nextButtonDisabled'></button>
Now the next button should only be available when either fooSelected is true or baaSelected is true and we need to watch any changes to these fields to make sure that the next button is made available or not:
$scope.$watch('[fooSelected,baaSelected]', function(){
$scope.nextButtonDisabled = !$scope.fooSelected && !scope.baaSelected;
}, true );
The above assumes that there are only a few checkboxes that affect the availability of the next button but it could be easily changed to work with a larger number of checkboxes and use $watchCollection to check for changes.
回答5:
This is re-post for insert code also. This example included: - One object list - Each object hast child list. Ex:
var list1 = {
name: "Role A",
name_selected: false,
subs: [{
sub: "Read",
id: 1,
selected: false
}, {
sub: "Write",
id: 2,
selected: false
}, {
sub: "Update",
id: 3,
selected: false
}],
};
I'll 3 list like above and i'll add to a one object list
newArr.push(list1);
newArr.push(list2);
newArr.push(list3);
Then i'll do how to show checkbox with multiple group:
$scope.toggleAll = function(item) {
var toogleStatus = !item.name_selected;
console.log(toogleStatus);
angular.forEach(item, function() {
angular.forEach(item.subs, function(sub) {
sub.selected = toogleStatus;
});
});
};
$scope.optionToggled = function(item, subs) {
item.name_selected = subs.every(function(itm) {
return itm.selected;
})
$scope.txtRet = item.name_selected;
}
HTML:
<li ng-repeat="item in itemDisplayed" class="ng-scope has-pretty-child">
<div>
<ul>
<input type="checkbox" class="checkall" ng-model="item.name_selected" ng-click="toggleAll(item)"><span>{{item.name}}</span>
<div>
<li ng-repeat="sub in item.subs" class="ng-scope has-pretty-child">
<input type="checkbox" kv-pretty-check="" ng-model="sub.selected" ng-change="optionToggled(item,item.subs)"><span>{{sub.sub}}</span>
</li>
</div>
</ul>
</div>
<span>{{txtRet}}</span>
</li>
Fiddle: example
回答6:
I've a sample for multiple data with their subnode 3 list , each list has attribute and child attribute:
var list1 = {
name: "Role A",
name_selected: false,
subs: [{
sub: "Read",
id: 1,
selected: false
}, {
sub: "Write",
id: 2,
selected: false
}, {
sub: "Update",
id: 3,
selected: false
}],
};
var list2 = {
name: "Role B",
name_selected: false,
subs: [{
sub: "Read",
id: 1,
selected: false
}, {
sub: "Write",
id: 2,
selected: false
}],
};
var list3 = {
name: "Role B",
name_selected: false,
subs: [{
sub: "Read",
id: 1,
selected: false
}, {
sub: "Update",
id: 3,
selected: false
}],
};
Add these to Array :
newArr.push(list1);
newArr.push(list2);
newArr.push(list3);
$scope.itemDisplayed = newArr;
Show them in html:
<li ng-repeat="item in itemDisplayed" class="ng-scope has-pretty-child">
<div>
<ul>
<input type="checkbox" class="checkall" ng-model="item.name_selected" ng-click="toggleAll(item)" />
<span>{{item.name}}</span>
<div>
<li ng-repeat="sub in item.subs" class="ng-scope has-pretty-child">
<input type="checkbox" kv-pretty-check="" ng-model="sub.selected" ng-change="optionToggled(item,item.subs)"><span>{{sub.sub}}</span>
</li>
</div>
</ul>
</div>
</li>
And here is the solution to check them:
$scope.toggleAll = function(item) {
var toogleStatus = !item.name_selected;
console.log(toogleStatus);
angular.forEach(item, function() {
angular.forEach(item.subs, function(sub) {
sub.selected = toogleStatus;
});
});
};
$scope.optionToggled = function(item, subs) {
item.name_selected = subs.every(function(itm) {
return itm.selected;
})
}
jsfiddle demo
来源：https://stackoverflow.com/questions/20968170/how-to-check-if-any-checkbox-is-checked-in-angular