How to validate the fields in Subpanel when users click at Save button

I've tried it already. recordlist.js is used for listing of each module.

I tried this one clients/base/views/subpanel-list/subpanel-list.js

But I don't know what event I need to use.

Please help me.

I've put my code below.

({
extendsFrom:'SubpanelListView',
initialize: function(options){
this._super('initialize', [options]);
this.context.on('button:save_button:click', this.do_check_case_topic, this); // Please help me to check this line
},
do_check_case_topic: function(event) {
console.log("In Check Save Event");

},

});

I've tried it already. recordlist.js is used for listing of each module.

I tried this one clients/base/views/subpanel-list/subpanel-list.js

But I don't know what event I need to use.

Please help me.

I've put my code below.

({
extendsFrom:'SubpanelListView',
initialize: function(options){
this._super('initialize', [options]);
this.context.on('button:save_button:click', this.do_check_case_topic, this); // Please help me to check this line
},
do_check_case_topic: function(event) {
console.log("In Check Save Event");

},

});