html - Masked input field is being cleared if it is not completely entered - 


<input id="format_thisformat" name="format_thisformat" type="hidden" value="##-##-##-##" />

so, know go on, basically, issue input field being cleared if complete mask isn't being entered (for example, if "12-44" being input, field clear, if "12-34-56-78" entered, field stay. want ability allow partial inputs. ideas how can edit line accomplish trying achieve? i'm assuming it's issue line, i'm not going post thousands , thousands of lines of code because won't make sense, custom api in visual basic spa.

you can add event listener , check if input valid:

let input = document.getelementbyid('format_thisformat');    input.addeventlistener('blur', (e) => {    if(!e.target.value.match(/\d{2}-\d{2}-\d{2}/g)){      e.target.value = '';    }  })
<input id="format_thisformat" name="format_thisformat" type="text" />


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