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Validating dynamically created textboxes

We can get the list of string values by using the GetNames static method of the Enum class and we can simply cast an instance of the enumeration to an integer in order to get its index. The constructor signature will have a parameter defining the path to the configuration file. We now need to determine whether the placeHolderControl has an entry in the hash table of the validatorCollections hash table. In this way, when we come to setting the specific values of a validator defined in a ValidatorCollections node, we can quickly access the correct "default values" hash table. Load the individual validator collection A sample configuration document validator collection for a password field is given below. We override the OnInit method so that we can take the additional steps necessary to create an instance of the user control. In order to avoid the manager being created time and again for every PlaceHolder on every Web form, we place it in the application cache. The event model of the Microsoft. This behavior doesn't happen by magic; we will have to implement it in our code. If necessary, these default property values can be overridden for a given validator. Each row is a trade that has 14 columns, representing the trade details. Secondly, the ControlToValidate attribute will match the ID property of some user input control to which all the dynamically created validator controls identified in the collection will be applied.

Validating dynamically created textboxes


Once this is complete, whenever the event is raised on the validation control, it will invoke the specified method from the instance of the user control. However, using the placeHolderControl variable makes the code a little easier to read and understand at the expense of a overhead of a few extra clock cycles and a miniscule memory consumption. When the Web page is rendered to the client browser, the validation controls we have dynamically created will be included and the user's input will be validated as defined by the configuration file. I think the Textbox that is created from control tool box is an activex control and so it is not the same as MSForms. This single page loads various user controls as specified by the "page" Request parameter. The cost of reflection from a throughput and performance perspective is too great. I will definitely try it. So, somewhere on the Web form that has a user input field for, say, an e-mail address, there will be a PlaceHolder control with an ID of "email". I cannot have two textboxes with the same name. We override the OnInit method so that we can take the additional steps necessary to create an instance of the user control. The one that we use allows us to create a delegate for or you can think of it as a function pointer to a specified instance method on a given class. The need for creation occurs in two situations: I do not want to put items on a form and repeat the code and events for all of them. As such, a delegate is equivalent a type-safe function pointer. This is shown below. We invoke GetEvent on the validation control's Type object to get information about the specified event. As there will be a number of user input fields, there will be a set of ValidatorCollection nodes, and these will be held in a single ValidatorSets node of the configuration file. Then it happened again. Using reflection, we get a PropertyInfo object that will allow us to set the value of the control's property. The ID attribute of the ValidatorCollection will match the PlaceHolder's ID property on the Web form in order to connect the user input field with the collection of validators that should to be created and applied. This behavior doesn't happen by magic; we will have to implement it in our code. In this way, when we come to setting the specific values of a validator defined in a ValidatorCollections node, we can quickly access the correct "default values" hash table. Dynamic Validation Manager Constructor The constructor needs to create the data structures shown in Figure 1, above. If necessary, these default property values can be overridden for a given validator. Related Books Introduction and Confession I'd like to say that the ideas in this article were based on something noble, such as the hope of freeing the Web developer to focus on implementing business logic, or maybe a desire to create a framework that helps provide a more consistent user interface, but it just wasn't that way.

Validating dynamically created textboxes


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