anujgarg Posted December 2, 2008 Share Posted December 2, 2008 we call a javascript function by two ways- <a href='javascript:fnName(id)'>ABC</a> and <a href='' onclick='fnName(id)'>ABC</a> What is the difference between these two? Also, which one is fast? Link to comment https://forums.phpfreaks.com/topic/135117-general-javascript-question/ Share on other sites More sharing options...
elite_prodigy Posted December 2, 2008 Share Posted December 2, 2008 You'll get better help on this in the Javascript forum on on down toward the bottom of the index page. Link to comment https://forums.phpfreaks.com/topic/135117-general-javascript-question/#findComment-703778 Share on other sites More sharing options...
RichardRotterdam Posted December 2, 2008 Share Posted December 2, 2008 we call a javascript function by two ways- actually there are more ways such as placing an event listener. This is one i prefer because you dont have to browse through all the html to find what link has what function. <a href='javascript:fnName(id)'>ABC</a> when javascript is disabled nothing will happen and <a href='a_link.html' onclick='fnName(id)'>ABC</a> What is the difference between these two? Also, which one is fast? when javascript is disabled now it will go to a_link.html Link to comment https://forums.phpfreaks.com/topic/135117-general-javascript-question/#findComment-703868 Share on other sites More sharing options...
KevinM1 Posted December 2, 2008 Share Posted December 2, 2008 The first version of the link uses what is called a pseudo-protocol to invoke the JavaScript. http:// and ftp:// are real protocols. javascript: is meant to be used within the href attribute of a link, much like those protocols. Like Dj Kat said above, if JavaScript is turned off, then any link using the pseudo-protocol will be broken. The second version uses an inline event handler. Again, like Dj Kat said, if JavaScript is disabled, the URL in the href attribute will be followed. I don't know if one is faster than the other. The second option is the best of those two choices. I prefer to not use inline event handlers, though, because it couples site structure (the HTML) to site behavior (the JavaScript). Instead, I code unobtrusively, like so: <html> <head> <title>Blah</title> <script type="text/javascript"> window.onload = function() { var myLink = document.getElementById('myLink'); myLink.onclick = someFunction; function someFunction() { alert("My id is: " + this.id); return false; //make sure the link IS NOT FOLLOWED } } </script> </head> <body> <a href="http://www.google.com" id="myLink">Clicky</a> </body> </html> Same functionality, but editing, maintaining, and debugging the JavaScript just got a whole lot easier as it's all in one centralized location, and not sprinkled throughout the HTML. The code, with very little modification (remove window.onload = function() { }), could even be placed in an external file, usable by the entire site, much like external CSS files. Link to comment https://forums.phpfreaks.com/topic/135117-general-javascript-question/#findComment-703899 Share on other sites More sharing options...
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