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Drop-down lists, check boxes, and radio buttons
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When adding a FIELD, a number of WIDGET options are available that configure how a user can enter content. Select lists, check boxes and radio buttons are used when a user must select a predetermined value; see Figure 4-14 for an example of each. Each field type can be configured so a user is forced to select a single value from the field or multiple values. A select list with Number of values set to 1 returns a drop-down field list, while values greater than 1 return a box-style selector. Similarly, check boxes are displayed when multiple values are allowed, and radio buttons are displayed when a single value is required. A single on/off or yes/no check box is also available.
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Figure 4-14. There are four different types of select lists, check boxes, and radio buttons depending on configuration settings. Note that this is a composite image displaying all the available configuration settings. Select lists, check boxes, and radio buttons consist of a label and a key. The label is the value the user selects; in Figure 4-15, the words One, Two, and Three are labels. The key is the value saved in the database and is not shown to the user. The value saved can be either numeric or text but needs to be selected when creating the field and cannot change afterward. Generally speaking, saving the value as a number is preferred, although either will work fine.
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ADDING CONTENT TYPES AND FIELDS
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Figure 4-15. Number of values determines the number of selections a user can make, while the Allowed values list contains the key (the value saved in database) and label (the value displayed to user). There are three different field types you can select: boolean, list, and term reference. Boolean is the only field type with an on/off check box that saves one value if the user selects the check box and another value if the check box is not selected. You can also use a list to create a single check box, but it will save a value only if the check box is selected; if the check box is not selected, then a value is not saved. List (text) is the only field type allowing text to be saved in the database.
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Files and images can be added to content types allowing for multiple files and images to be associated with a single node. Files and images are uploaded into a folder on the server, and Drupal saves file information (file name, type, and so on) in a database table. This is important to note: files and images are not saved in a database. Rather, they are saved in a specific folder within the files directory. This is important because it can cause a lot of problems if you change the file directory after files have been uploaded. See Figure 4-16 for a file uploaded to a node with the Description and Include file in display fields enabled.
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Figure 4-16. The file upload field with Description and Include file in display fields enabled Configuring files and images are similar in many aspects. Both share the following settings:
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Allowed file extensions File directory Maximum upload size (note that maximum size also depends on settings in the php.ini config file) Upload destination
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Any number of Allowed file ex tensions can be added and must be separated with a space or comma; do not include the leading dot (for example, use pdf rather than .pdf). See Figure 4-17 for an example. The File directory setting is the location on your server where uploaded files are stored. Depending on upload destination, a file or image may be uploaded to the private or public directory (see 2 for details). This brings up another good point: if you change a field from public files to private files (or vice versa), files do not automatically transfer from one folder to the other. This means you will need to move the files or images yourself, or users will receive an error message when they try to download. I recommend saving each file type or image field type in its own directory. Otherwise, files from multiple fields will live in the same directory and will cause havoc if you ever need to update a field or content type.
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Figure 4-17. Shared settings between image and file field types Maximum file size can be entered as bytes (such as 1024), kilobytes (such as 500KB), or megabytes (such as 10MB). You are also limited by the maximum upload size as configured in the php.ini file, which overrides any settings in Drupal. For example, you may set a 100MB maximum upload size in Drupal, but if php.ini is configured for a maximum 2MB upload, then you can upload only a 2MB file. See Figure 4-18 for an example image upload with the Alternate te x t and Title fields enabled. The Image field type has several settings specific to images. The minimum and maximum image size can be set in pixels. If an image is larger than the maximum image resolution allowed, the file is resized to the entered width and height. Images smaller than minimum image resolution are not allowed for upload; see Figure 4-19 for details. Select Enable Alt field and Enable Title field to display the alternate text and title fields on the image upload field. Alternate text is displayed when the image is not available and is often used by search engines to categorize images. The title is displayed when the mouse pointer is placed over the image. The Preview image style setting determines how the image displays on the node creation form after it is uploaded.
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