Custom Script for client side

custom script for validation any field length :



frappe.ui.form.on("IMEI", "validate", function(frm) {
        var imei_number = frm.doc.imei_number;
var len = imei_number.length ;
        if (len==15 ){
        cur_frm.set_value("imei_number", imei_number);
}
else{
frappe.msgprint(" IMEI number should be 15 number!!! please re enter the number ");
}
    });