Hosting the InfoPath Form Control in a Web Browser in .NET

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menu item on the Tools menu in InfoPath design mode) When choosing a submit connection in the Data Connection Wizard, select the To a hosting environment, such as an ASPNET page or a hosting application option Every SubmitToHost connection you create will be given a name that you choose We suggest naming each connection appropriately so you can handle them in your host page when that submit connection is executed Notice that there is only one SubmitToHost event handler in your ASPNET host page to handle any number of SubmitToHost connections by the form The best way to handle this many-to-one mapping is to look at the name of the SubmitToHost connection and run whatever code should be associated with that connection name Listing 1817 shows one possible example of how you might handle this mapping, which should clarify this concept
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Listing 1817: How to Handle Multiple SubmitToHost Form Connections in a Host Page
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switch (eAdapterName) { case "NewCustomerData": // write code here to handle SubmitToHost // by the "NewCustomerData" connection break; case "UpdatedPro le": // handles the connection named break;
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"UpdatedPro le"
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// handle more SubmitToHost connections as necessary default: throw new NotImplementedException( "This SubmitToHost connection is not implemented: + eAdapterName); }
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There are several cases when the form needs the host page to do something, but it shouldn t be considered a submit action A key example of using such functionality is when you re trying to do something that InfoPath Forms Services doesn t support, such as showing a message box dialog We mentioned in 14 that you cannot show a dialog box message using rules when a form is lled out in the browser However, you can use a host page to work around that limitation and show a dialog! In this sample, we ll show you how to show a dialog box with a custom message Although this
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18: Hosting InfoPath
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Submit Is Asynchronous
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Submitting a browser-enabled form, including by using SubmitToHost, is always asynchronous Let s explain what this means and give a simple example Recall from 17 that Forms Services records the formediting actions within the browser Only occasionally will the form require a postback to communicate the changes with the server Say, for example, you have a Button control in your form template that runs form code The code behind the Button may do something similar to the following: switch views, submit the form, and set a data source field to a value Notice that submit is not the last action When the Button click is replayed on the server, the order of operations is the following: switch views, set a data source field to a value, and finally send data back to the browser with a pending submit action No matter what actions happen before submit, submit is always added as a pending action when data is sent back to the form Ultimately, the pending submit action requires another (automatic) postback to actually execute
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is just a simple example, you can take the ideas we present and let your imagination run wild with possibilities! Earlier in this chapter we introduced the NotifyHost method You ll be glad to know that this method also works with hosted browser forms Simply call it within your InfoPath form code, and Forms Services res the NotifyHost event handler in the ASPNET page For this example, we re going to call NotifyHost behind a Button control in the LifeInsurance_ BrowserEnabled_NotifyHost sample form template The purpose of the Button is to check the form for errors and pass them as a string to the host However, if there aren t any errors, the button still shows a dialog as a proofof-concept The code behind the new Button (called Validate Form) is shown in Listing 1818 (Notice the escaping of the backslash characters so the JScript code properly decodes the carriage return and newline characters)
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