Meteor controlling copying and pasting in a text field - meteor

Question

I am trying to prevent copying and pasting white spaces in the username field inside my Meteor app template but I am always getting an error as shown below, can someone please tell me what I am doing wrong / missing and is there any other way to control content pasted in a text field in Meteor template? Thanks
Template.UserRegisteration.events({
'input #username':function(e,t){
this.value = this.value.replace(/\s/g,'');
}
});
Error:
Uncaught TypeError: Cannot read property 'replace' of undefined

Answer 1

this is the context is the data context where the input id="username field is.
To get the field's DOM element use e.currentTarget instead of this.

Answer 2

As Akshat mentioned to get field DOM element use e.currentTarget instead of this, back to your question code sample please try the following
Template.UserRegisteration.events({
'input #username':function(e,t){
var text = e.currentTarget.value;
e.currentTarget.value = text.replace(/\s/g,'');
}
});

Answer 3

The following example sets out how to extract and set the value of a DOM element within a Meteor event:
https://www.meteor.com/try/4
Template.body.events({
"submit .new-task": function (event) {
// This function is called when the new task form is submitted
var text = event.target.text.value;
Tasks.insert({
text: text,
createdAt: new Date() // current time
});
// Clear form
event.target.text.value = "";
// Prevent default form submit
return false;
}
});
Within a Meteor events block, "this" is not the DOM element so you cannot call a value on it.