write one example of all the types of input you are study with the help of a web page
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Answer:
A crucial part of every web application, either related to biology and bioinformatics or not, it to gather user input about the data to be processed and likely, info on how the data should be processed in order to obtain the desired elaboration or output. This can be done through a web form. In order for the data to be structured so that the data processing script can elaborate it, the web form typically comprises various fields.
To use an example we have become familiar with in the previous chapter, let us imagine a web application where the user can input a nucleotide sequence, select a transformation mode between reverse, complement and reverse-complement, and then get the transformed sequence as an output (see here for an example of such a form, slightly more elaborated than the example we are discussing now). The form fields for this application’s web form could be “sequence” and “selected transformation”. For each of the fields, we wish to collect, through the form, a corresponding value. Sending the form data to a script by pressing the submit button equates to sending the script a number of field-value couples, as we will see more in depth later on.
HTML provides several form elements that can be used either individually or in combination to get the user input. The perfect element to collect a information for the “sequence” field from the user would be a text-area, see one below:
A text-area allows the user to input text in it, freely.
Although a second textarea could in theory be used to collect from the user information about the “selected transformation” field, you surely see why letting the user freely type the kind of selected transformation he wishes to apply to the sequence in a textarea is a poor choice. Remember that once the user presses the “Submit” button of the form, the data goes to a script that should be able to “understand” it and act accordingly. Therefore, to let the user select the desired transformation, other HTML form elements are better suited, such as for example a dropdown menu with a few pre-defined choices, also known as a select:
Explanation:
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