Validation Types
How many different ways or types of validation can we carry out.- → Scenarios: When to Validation
- → Required Inputs
- → Min-Length Validation
- → Data Type Validation
- → Custom Expression Validation
Custom Expression Validation
Whether a field is required or not, a field can be checked against a number of custom expressions. If a field is not required, the custom expression validation is checked only if the input has value.The input attribute data-val-checkAgainst is used to specify a number pre-defined type of expressions.
You can test for the following types of custom expressions:
Equal To | Another Input | An Array | Numeric Operators | String Operators | Date Operators | RegEx Expression
Equal To Another Input
Supply the ID selector of another input in the data-val-checkAgainst attribute that the value of the input field must match exactly. This is useful, as an example, for retype or confirmation fields like retype email or password.Example:
<input type="text" name="compare1" id="compare1" data-val-required="1" value="United States" /> <input type="text" name="compare2" data-val-required="1" data-val-checkAgainst="#compare1" />