Javascript 通过angularjs中的2个指令将函数作为参数传递
我有一个任务项列表: 模板:Javascript 通过angularjs中的2个指令将函数作为参数传递,javascript,angularjs,angularjs-directive,angularjs-components,Javascript,Angularjs,Angularjs Directive,Angularjs Components,我有一个任务项列表: 模板: <div> <p class="assignment">{{ task.Assignment }}</p> <p class="assignment">{{ task.Assignee }}</p> <button class="btn btn-primary btn-sm" ng-click="backTask()"><i class="fas fa-arrow
<div>
<p class="assignment">{{ task.Assignment }}</p>
<p class="assignment">{{ task.Assignee }}</p>
<button class="btn btn-primary btn-sm" ng-click="backTask()"><i class="fas fa-arrow-left"></i></button>
<button class="btn btn-primary btn-sm" ng-click="advanceTask()"><i class="fas fa-arrow-right"></i></button>
<button class="btn btn-danger btn-sm" ng-click="deleteTask()"><i class="fas fa-trash-alt"></i></button>
</div>
{{task.assignment}
{{task.assignment}
任务列表中的任务:
模板:
<div id="{{ status }}" class="col-md-4 taskList">
<ul class="list-group">
<li class="list-group-item flex-column">To Do</li>
<li ng-repeat="task in tasks | filter:{Status: 0}" class="list-group-item list-group-item-danger">
<task
task="task"
back-Task="backTask()"
advance-Task="advanceTask()"
delete-Task="deleteTask()">
</task>
</li>
</ul>
</div>
要做的事
-
我需要从初始调用中传递back、advance和delete任务函数:
<task-List
status="todo"
tasks="tasks"
back-Task="backTask($event, task)"
advance-Task="advanceTask($event, task)"
delete-Task="deleteTask($event, task)">
</task-List>
到每个单独的任务(以便每个任务的按钮可以更改其属性)。在我当前的代码中,当最后一次调用按下按钮时,$event和task都未定义,在这种情况下,传递函数作为参数的正确方法是什么 我认为问题在于,当您实例化任务列表时,您直接调用函数
back task=“backTask($event,task)”
相反,您应该传递对函数的引用back Task=“backTask”
并在任务模板中的ng clicks中调用函数ng click=“backTask($event,Task)”
任务模板
<div>
<p class="assignment">{{ task.Assignment }}</p>
<p class="assignment">{{ task.Assignee }}</p>
<button class="btn btn-primary btn-sm" ng-click="backTask($event, task)"><i class="fas fa-arrow-left"></i></button>
<button class="btn btn-primary btn-sm" ng-click="advanceTask($event, task)"><i class="fas fa-arrow-right"></i></button>
<button class="btn btn-danger btn-sm" ng-click="deleteTask($event, task)"><i class="fas fa-trash-alt"></i></button>
</div>
{{task.assignment}
{{task.assignment}
任务列表模板
<div id="{{ status }}" class="col-md-4 taskList">
<ul class="list-group">
<li class="list-group-item flex-column">To Do</li>
<li ng-repeat="task in tasks | filter:{Status: 0}" class="list-group-item list-group-item-danger">
<task
task="task"
back-Task="backTask"
advance-Task="advanceTask"
delete-Task="deleteTask">
</task>
</li>
</ul>
</div>
要做的事
-
任务列表实例化
<task-List
status="todo"
tasks="tasks"
back-Task="backTask"
advance-Task="advanceTask"
delete-Task="deleteTask">
</task-List>
希望它能起作用并且有意义:)
另外,我不确定您是如何定义指令的,但请记住,在定义指令名称或属性时,您会在js声明中使用驼峰大小写,例如taskList,并在模板
中使用小写破折号分隔,例如任务组件的,使用带有的单向绑定这是我已经尝试过的,赋值和赋值都正确显示,但是单击按钮不会进行任何调用,这就是为什么我认为我需要从一开始就传递带有参数的函数。
app.component("task", {
bindings: { item: '<',
backTask: '&',
advanceTask: '&',
deleteTask: '&'
},
controller: function() {
this.backClick = (event) => this.backTask({$event: event});
this.advanceClick = (event) => this.advanceTask({$event: event});
this.deleteClick = (event) => this.deleteTask({$event: event});
},
template:
`<div>
<p class="assignment">{{ $ctrl.item.Assignment }}</p>
<p class="assignment">{{ $ctrl.item.Assignee }}</p>
<button ng-click="$ctrl.backClick($event)"><i class="fas fa-arrow-left"></i></button>
<button ng-click="$ctrl.advanceClick($event)"><i class="fas fa-arrow-right"></i></button>
<button ng-click="$ctrl.deleteClick($event)"><i class="fas fa-trash-alt"></i></button>
</div>`
});
app.component("taskList", {
bindings: { status: '<',
tasks: '<',
backTask: '&',
advanceTask: '&',
deleteTask: '&',
},
controller: function() {
this.backClick = (event,task) => backTask({$event:event, $task:task});
this.advanceClick = (event,task) => advanceTask({$event:event, $task:task});
this.deleteClick = (event,task) => advanceTask({$event:event, $task:task});
},
template:
`<div id="{{ $ctrl.status }}" class="col-md-4 taskList">
<ul class="list-group">
<li class="list-group-item flex-column">To Do</li>
<li ng-repeat="task in $ctrl.tasks | filter:{Status: 0}" class="list-group-item list-group-item-danger">
<task
item="task"
back-task="$ctrl.backClick($event,task)"
advance-task="$ctrl.advanceClick($event,task)"
delete-task="$ctrl.deleteClick($event,task)">
</task>
</li>
</ul>
</div>`
});
<task-list
status="vm.todo"
tasks="vm.tasks"
back-task="vm.backTask($event,$task)"
advance-task="vm.advanceTask($event,$task)"
delete-task="vm.deleteTask($event,$task)">
</task-list>