As a web developer, you must have come across situations where you need to show or hide certain content on your website based on certain conditions. This is where conditional tags in HTML come into play. Conditional tags allow you to add logic to your HTML code so that certain content is displayed only when certain conditions are met. In this article, we will discuss how to use conditional tags effectively in HTML.
If you're a blogger using the Blogger platform, you may have heard of conditional tags. These tags are a powerful tool that allow you to show or hide content based on certain conditions. They can be inserted in the HTML code of your template, as well as in an HTML/JavaScript gadget, and are extremely useful for customizing the look and feel of your blog.
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Blogger conditional tags work on a simple principle: a condition is defined, and the content is executed according to a particular case. This makes it possible to target specific pages, URLs, or even individual posts. The syntax for using conditional tags is relatively straightforward, and follows a basic structure:
<b:if cond='Condition'>
--- Content to show if the condition is true ---
<b:else/>
--- Content to show if the condition is false ---
</b:if>
One of the most common uses of conditional tags is to show or hide widgets based on the page type. This can be achieved using the data:blog.pageType variable, which returns the type of page being displayed. For example, to show a widget only on the homepage of your blog, you can use the following code:
<b:if cond='data:blog.url == data:blog.homepageUrl'>
--- Widget content to show on the homepage ---
</b:if>
Similarly, you can use conditional tags to show content only on specific label pages, archives pages, or static pages. Here are some examples:
Show widget only on label pages
<!-- Show widget only on label pages -->
<b:if cond='data:blog.searchLabel'>
--- Widget content to show on label pages ---
</b:if>
Show widget only on specific label page
<
!-- Show widget only on specific label page -->
<b:if cond='data:blog.searchLabel == "your_label"'>
--- Widget content to show on label page "your_label" ---
</b:if>
Show widget only on archives pages
<!-- Show widget only on archives pages -->
<b:if cond='data:blog.pageType == "archive"'>
--- Widget content to show on archives pages ---
</b:if>
Show widget only on static pages
<!-- Show widget only on static pages -->
<b:if cond='data:blog.pageType != "static_page"'>
--- Widget content to show on static pages ---
</b:if>
The data:blog.pageType variable can also be used to target all pages except for individual posts. For example, to show a widget on all pages except for post pages, you can use the following code:
<b:if cond='data:blog.pageType == "index"'>
--- Widget content to show on all pages except post pages ---
</b:if>
In addition to page type, there are many other conditions that can be used with conditional tags. These include the number of comments on a post, whether a post has a jump link, whether comments are allowed, and whether the blog is being viewed on a mobile device.
Here are some blogger conditional tags examples:
<!-- Show widget only if post has backlinks -->
<b:if cond='data:post.showBacklinks'>
--- Widget content to show if post has backlinks ---
</b:if>
<!-- Show widget only if display name is "specific-name" -->
<b:if cond='data:displayname == "specific-name"'>
--- Widget content to show if display name is "specific-name" ---
</b:if>
<!-- Show widget only if post has a specific number of comments -->
<b:if cond='data:post.numComments == [number_here]'>
--- Widget content to show if post has [number_here] comments ---
</b:if>
<!-- Show widget only if post has a specific number of comments -->
<b:if cond='data:post.numComments == [number_here]'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if post has a jump link -->
<b:if cond='data:post.hasJumpLink'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if comments are allowed on the post -->
<b:if cond='data:post.allowComments'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if blog has a meta description -->
<b:if cond='data:blog.metaDescription'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if blog is being viewed on mobile device -->
<b:if cond='data:mobile'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if blog has a title -->
<b:if cond='data:title'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if blog title is not empty -->
<b:if cond='data:title != ""'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if post thumbnails are set to false/true -->
<b:if cond='data:showThumbnails == "false/true"'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if post snippets are set to false/true -->
<b:if cond='data:showSnippets == "false/true"'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if post has a thumbnail image -->
<b:if cond='data:post.thumbnail'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if blog is set to display posts as a list -->
<b:if cond='data:display == "list"'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if blog URL matches label URL -->
<b:if cond='data:blog.url == data:label.url'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if post frequency numbers are enabled -->
<b:if cond='data:showFreqNumbers'>
<!-- Your conditional content goes here -->
</b:if>
<!-- Show widget only if images are enabled -->
<b:if cond='data:useImage'>
<!-- Your conditional content goes here -->
</b:if>
In conclusion, conditional tags are a powerful tool that allow web developers and bloggers to show or hide content based on specific conditions. With conditional tags, it is possible to customize the look and feel of a website or blog by displaying different content on different pages, targeting specific user actions, or detecting specific device types. The syntax for using conditional tags is relatively straightforward, and a variety of conditions can be used to achieve the desired results and you can follow the official document for more information, By leveraging conditional tags effectively, web developers and bloggers can create a more engaging and personalized user experience for their visitors.
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