columns click function,can not get "this"
david030918 opened this issue · comments
hi,
I want to add a click event to columns,and set a dialog visable
but in click function,I got "this" is binded to event object.
data() {
return {
lastId: 16,
}
},
....
In option->taskList->columns:
{
html: true,
events:{
click({event, data}) {
console.log(this.lastId++) <- [this.lastId] is undefined
}
I would appreciate for any help.
Events are not binded to Events c'mon ;) but this
inside function in option events for sure are not pointing to your containing component.
This is intended behavior - this is up to you what you bind to your events - you can also use scoped variable in your function to get your component data.
gantt-elastic does not want to know anything about parent component - it should be kind of sandboxed and self contained thing.
I don't know how you mount gantt (as standalone component? as component in other component?) so I can't really help - more code is needed to help.
I suggest to mount via app = new Vue(....)
option, so app will contain all your data, and then inside click handler you can use app.lastId
data property.
let app;
const tasks ={/*...*/};
const options = {
/*...*/
click({event, data}){
// app is assigned here for sure because no click event will be fired before vue initialisation,
// after vue is mounted and start working, click event will be fired, and after vue is mounted app is assigned
app.lastId++;
}
/*...*/
};
app = new Vue({
el:'#gantt',
template:`<gantt-elastic :tasks="tasks" :options="options"></gantt-elastic>`,
components: {
ganttElastic: GanttElastic
},
data() {
return {
tasks: tasks,
options: options,
lastId:16,
};
}
});
You can also define function before and bind it to your app (javascript is really elastic and I like it for this :) ).
let app; // for now let it be here and wait for assignment
function myClickHandlerBluePrint({event, data}){
this.lastId++;
}
const myClickHandler = myClickHandlerBluePrint.bind(app);
const options = {
/* ... */
click: myClickHandler, // WHAAAAAT :O ?
/* ... */
};
app = new Vue({ // let assign vue instance to app variable
/* ... */
data(){
return {
tasks,
options,
lastId:16,
};
}
/* ... */
})