SP2013: Disable text or number field once populated

Question

I am looking for a jQuery script to conditionally disable two field types:

1. Disable a text field if it is not blank and
2. Disable a number field once it is non zero.

I see many posts on disabling People Pickers and Date fields, but not the above.

Thank you for you help.

Answer 1

Assuming you want to disable the form fields on Edit form.

For Single line of text field: Consider column name is - Title

$(document).ready(function(){
    if($("input[title^='Title']").val()) {
        $("input[title^='Title']").attr("disabled", "disabled");
    
        //$("input[title^='Title']").attr("readonly", "readonly");
    }
});

For Number field: Consider column name is - Content Amount

$(document).ready(function(){
    if($("input[title^='Content Amount']").val() != "0") {
        $("input[title^='Content Amount']").attr("disabled", "disabled");
        
        //$("input[title^='Content Amount']").attr("readonly", "readonly");
    }
});