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ssrs barcode font not printing Download Free Trial for VB . NET Code 128 Generator , Creating and Drawing Code 128 in VB . NET , ASP.NET Web Forms and Windows Forms applications, with ... visual basic barcode scanner input Figure 5-9. Encoding special HTML characters The HtmlEncode() method is particularly useful if you re retrieving values from a database and you aren t sure whether the text is valid HTML. You can use the HtmlDecode() method to revert the text to its normal form if you need to perform additional operations or comparisons with it in your code. Along with the HtmlEncode() and HtmlDecode() methods, the HttpServerUtility class also includes UrlEncode() and UrlDecode() methods. Much as HtmlEncode() allows you to convert text to valid HTML with no special characters, UrlEncode() allows you to convert text into a form that can be used in a URL. This technique is particularly useful if you want to pass information from one page to another by tacking it onto the end of the URL. You ll see this technique demonstrated in 7. Here we use the Zend_Db_Select class that we first used in 8. For short queries such as in Listing 10-2, I tend not to bother using this class, but when the query gets longer as in this listing, it is definitely worth using. This query retrieves the number of rows for the current blog that have the given tag (this value should be only 1 or 0 since the same tag can t be used more than once for a post). This method returns true if the count is greater than zero. The next function we ll look at is addTags(), which is shown in Listing 10-4. This function begins once again by making sure the record is loaded and then continues by cleaning the tags that have been passed in using the $tags argument. This function will accept either a string or an array of strings to use as the tags. Listing 10-4. Adding One or More Tags to a Post Using addTags() (BlogPost.php) public function addTags($tags) { if (!$this->isSaved()) return; if (!is_array($tags)) $tags = array($tags); // first create a clean list of tags $_tags = array(); foreach ($tags as $tag) { $tag = trim($tag); if (strlen($tag) == 0) continue; $_tags[strtolower($tag)] = $tag; } // now insert each into the database, first ensuring // it doesn't already exist for the current post $existingTags = array_map('strtolower', $this->getTags()); foreach ($_tags as $lower => $tag) { if (in_array($lower, $existingTags)) continue; $data = array('post_id' => $this->getId(), 'tag' => $tag); $this->_db->insert('blog_posts_tags', $data); } } As part of this function, we must first ensure that no duplicates have been passed to the function. We are ignoring case in the tags (so AJAX and Ajax would be treated as the same tag). In this chapter, you ve seen how ASP.NET controls fire events that you can handle in your code. Although server controls are the most common source of events, there s another type of event that you ll occasionally encounter: application events. Application events aren t nearly as important in an ASP .NET application as the events fired by server controls, but you might vb.net code 128 font VB . NET Code 128 Generator generate , create barcode Code 128 ...
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