Working with Forms in Java

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155 Working with Forms
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The server could return a value of failure along with a descriptive error message and some suggestions for available user names similar to the one entered by the user
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Which is the right approach Well, that is up to you Neither Ajax nor Dojo proscribes your actions However, later when we study Dojo widgets, we ll see that widgets have a more standard (but still flexible) way of handling error messages
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155 Working with Forms
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Many of the pages in a typical business application collect data on forms and send that data to the server for some kind of processing So working with form data in JavaScript is very common How does the use of Ajax and Dojo influence how we work with form data Developers may think that because they are using Ajax to submit data to the server instead of using the standard form submit that they don t need to use forms anymoreThis is incorrect for a number of reasons Forms will still be used because even though the application may be making Ajax Remoting requests prior to form submission, the form will usually still be submitted as the final step of entering data on a pageThis reduces the amount of new development on the server since the service used to process form submission without Ajax has probably already been coded Another reason to continue to use forms in Ajax applications is that forms are just a darn good way to organize data in the browser Related data elements can be grouped together by keeping them within a form tag Multiple forms can reside on the same page to separate groups of data Also the browser gives us some convenient shortcuts for referencing data fields that are within forms For example, review the following HTML snippet that follows It defines a simple form with two data fields and a submit button
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<form action="submitForm" name="userInfo" method="POST"> First Name: <input type="text" name="firstName"/> <br/> Last Name: <input type="text" name="lastName"/> <br/> <input type="submit"> </form>
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When the DOM is built for these fields, they can be referenced by the following shorthand Notice how the browser builds a DOM that contains elements with names corresponding to the existing form and form data elements Remember, upper/lower case is important!
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firstName = documentuserInfofirstName; lastName = documentuserInfolastName;
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15
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Ajax Remoting
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And, finally, another good reason to continue to use forms in your application (rather than just using the <input> tags alone) is that Dojo provides many useful functions for working with data held in forms, which we discuss now
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1551 Dojo Function dojoformToObject
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Because JavaScript is an Object Oriented programming language, as developers, we naturally want to work with our data as objects Dojo provides a function (formToObject) for converting the data in a form to an object so that we can work with it more easily Let s look at the API for dojoformToObject
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Table 156
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Summary:
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Description of dojoformToObject Function
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dojoformToObject(formNode) This function will return an object with properties corresponding to the form fields in the form specified in formNode The function returns the values encoded in an HTML form as string and number properties in an object Disabled form elements, buttons, and other non-value form elements are skipped Multi-select elements are returned as an array of string values The names of the form elements will be the same as the property names in the returned object Upper and lower case will be maintained in the property names
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Method Signature:
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Parameter: formNode
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DOM form element used to extract form element names and values The formNode may be a reference to a form DOM element It may also be a string containing the id of the form element
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One of the most useful features of this function is that the form node can be identified by either a reference to a DOM node or by the id of the node Usage Example This example assumes the existence of the following form
<form action="submitForm" name="userInfo" id="form1" method="POST"> First Name: <input type="text" name="firstName"/> <br/> Last Name: <input type="text" name="lastName"/> <br/> <input type="submit"> </form>
Notice how we are now using the id attribute in the form tagThe following function call returns an object representing the form