How to add and remove text to a string using jQuery -

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i have web form hidden input field follows:

<input id="requiredfields" name="requiredfields" type="hidden" value="firstname,lastname,email,phone">

i want add , remove ",location" based on condition using jquery follows:

$('input[name="locationstatus"]:radio').on("change", function() {     if ($('input[name="locationstatus"]:radio:checked').val() == 'yes') {         /* need syntax append text ',location' #requiredfields string */     }     else {         /* need syntax remove text ',location' #requiredfields string */     } });

thanks

using jquery's .val() update value of requiredfields

$('input[name="locationstatus"]:radio').on("change", function() {     if ($('input[name="locationstatus"]:radio:checked').val() == 'yes') {         $('#requiredfields').val($('#requiredfields').val() + ',location');     }     else {         $('#requiredfields').val($('#requiredfields').val().replace(',location',''));     } });

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