![]() ![]() In this section we'll build the HTML markup portion of the example. Important note: If the ability to hide the alternative content with JavaScript does not exist, the browser/user agent will be able to render the content ensuring accessibility and graceful degradation. This ensures graceful degradation of the script. When JavaScript is disabled the function no longer works, and the alternative content in the markup is revealed. If the user agent cannot interpret the JavaScript expressions, the alternative content in the markup is revealed. When JavaScript is enabled, the external function keeps the alternative content hidden. Associate the hook with an external JavaScript function, which sets up a parent-to-child relationship between the container and its content.Insert an unobtrusive JavaScript "hook" via an id attribute value in the parent container's opening tag.So, how can behavior intended by the HTML element be enabled in these antiquated/partially-capable JavaScript user agents? The workflow is as follows: If the user agents among your audience are unpredictable, however, replacing the element with another mechanism becomes significant. If your writing is targeted at modern, standards-based, compliant, and fully capable JavaScript user agents, employing the element is no problem. This has an impact on the accessibility of the content. User agents with partial/antiquated JavaScript capabilities however interpret the element correctly and do not show the content, but when JavaScript is disabled also do not show the content - it never gets rendered. User agents that do not support JavaScript will display the content within it. Modern user agents with JavaScript enabled will hide content contained within the tags, and reveal it when JavaScript is disabled. In his book "ppk on JavaScript", Peter-Paul Koch points out that the HTML element has a limitation. Palinkas, Senior Technical Writer, Information Architect © 2015 Contents Introduction Solving the problem Building the HTML markup Building the unobtrusive DOM/JavaScript SummaryĬode examples in this document are editable.Īfter editing, click Reset to restore the original code. Var tgtTags = document.getElementsByTagName('noscript') Īlert("Num of noscript tags: " + tgtTags.length) Īlert("Num of noscript tags: " + tgtTags.Author: Frank M. Window.addEventListener('load', onDocLoaded, false) (1) to fire on a button press, so you can see the effect in the DOM viewer of your browser's JS tools. Dunno, probably mostly irrelevant here anyway. either querySelector/querySelectorAll may have been the odd one out - returning an array that doesn't change as the document does. I forget the specifics, but I read about it the other day. The NodeList returned by getElementsByTagName is live and as such, changes size to reflect operations on the collection of elements it represents - this is why there's only one call needed to getElementsByTagName. Next, you don't need to use an id - you can grab it with any number of methods. I do this by waiting until all elements, images and scripts have been loaded. It wouldn't make any sense including jQuery just for this tiny script.)įirstly, you need to ensure that the tag exists when the javascript is called. But I plan on using the script on sites that do not use it. (I want to note that this site in fact uses jQuery. I use this to asynchronously load some stylsheets. The noscript tag is located inside the tag. I need to remove it because the code working with the element might be executed several times. ![]() Since I am accessing the element over an specific ID and using it's content a working solution might be changing the ID or emptying the content. Noscript.innerHTML = "" // doesn't do anything Noscript.outerHTML = "" // doesn't do anything (noscript) // noscript.parentNode is null I tried these: // The noscript tag has a id. I am trying to remove a tag with JavaScript. ![]()
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