Table method validateField() in D365 F&O - X++ Code

X++ Programming Language >   D365 Table >   Table Methods  

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Answer:

Method validateField() is used for validation only and will return true or false. If the return value is false, the application user will be prevented to continue changing a field value.

Exampl: Let’s override validateField for MyFirstTable to verify the condition that CustName must be have > 3 characters.

public boolean validateField(fieldId _fieldIdToCheck)
{
    boolean ret;
    ret = super(_fieldIdToCheck);
    if (ret)
    {
    switch (_fieldIdToCheck)
    {
    case fieldnum(MyFirstTable, custName):
        if (strlen(this.custName) <= 3)
        ret = checkFailed("Customer name must be longer than 3 characters.");
    }
    }
    return ret;
}

After adding this method, open table MyFirstTable using Table browser and press Ctrl+N, in the new record try to enter less than 3 characters for field custName, Ax will throw warning message stating "Customer name must be longer than 3 characters." And you will be asked to enter value again. Thus we validate the data to be entered for a specific field.

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