Javascript "delete value" and "delete data" instructions

Question

User206383436 posted

Hi,

I have a piece of Javascript code that contains the following 2 blocks of instructions. They are part of 2 different functions. Both functions get the value of a hidden control. One function performs delete value and the other function performs delete data. I will very much appreciate if you explain what these delete operations do.

 var token = $('input[type=hidden][name=__RequestVerificationToken]', document).val();
delete value['__RequestVerificationToken'];

var token = $('input[type=hidden][name=__RequestVerificationToken]', document).val();
delete data['__RequestVerificationToken'];

Respectfully,
Jorge Maldonado

Answer 1

User-719153870 posted

Hi Jorge,

JORGEMAL

var token = $('input[type=hidden][name=__RequestVerificationToken]', document).val();

This is a Multiple Attribute Selector, you can find some related samples here or more detailed information here.

The 'document' is a context in jQuery selector which can  specify scope of your selector, 'document' usually means the whole current page.

You can also see realted information when you type this syntax( $(','), the commar ) in VS, like below:

JORGEMAL

delete value['__RequestVerificationToken'];

The delete method in JS is used to delete a property of one object.

The strange thing is that in your demo, it seems in a wrong syntax. It should be object['property'] not attibute['property value']. Are you missing some code here?

Usually, we use removeAttr() method to remove an attribute of a control.

Hope this will help.

Best Regard,

Yang Shen

Answer 2

User-474980206 posted

you don't show enough code to know what objects value or data represent. but the code is deleting the  '__RequestVerificationToken' property of each.

Answer 3

User538199814 posted

Thanks for solution. I was also searching same.