OnClick without jQuery
JavascriptOnclickJavascript Problem Overview
How to make onclick without jQuery, with no extra code in HTML, such as:
<a href="#" onclick="tramtramtram">
Just using an external js file?
<script type="text/javascript" src="functions.js"></script>
I need to replace this code:
$("a.scroll-up, a.scroll-down").click(function(){
SNavigate($(this).attr("href").substr(7));return false;
});
Javascript Solutions
Solution 1 - Javascript
When this anchor will contain only one function to handle on click, than you can just write
document.getElementById('anchorID').onclick=function(){/* some code */}
otherwise, you have to use DOM method addEventListener
function clickHandler(){ /* some code */ }
var anchor = document.getElementById('anchorID');
if(anchor.addEventListener) // DOM method
anchor.addEventListener('click', clickHandler, false);
else if(anchor.attachEvent) // this is for IE, because it doesn't support addEventListener
anchor.attachEvent('onclick', function(){ return clickHandler.apply(anchor, [window.event]}); // this strange part for making the keyword 'this' indicate the clicked anchor
also remember to call the above code when all elements are loaded (eg. on window.onload)
-- edit
I see you added some details. If you want to replace the code below
$("a.scroll-up, a.scroll-down").click(function(){SNavigate($(this).attr("href").substr(7));return false;});
with sth that doesn't use jQuery, this should do the job
function addEvent(obj, type, fn) {
if (obj.addEventListener)
obj.addEventListener(type, fn, false);
else if (obj.attachEvent)
obj.attachEvent('on' + type, function() { return fn.apply(obj, [window.event]);});
}
addEvent(window, 'load', function(){
for(var i=0, a=document.anchors, l=a.length; i<l;++i){
if(a[i].className == 'scroll-up' || a[i].className == 'scroll-down'){
addEvent(a[i], 'click', function(e){ SNavigate(this.href.substr(7)); e.returnValue=false; if(e.preventDefault)e.preventDefault();return false});
}
}
});
Solution 2 - Javascript
how about this :
document.getElementById("lady").onclick = function () {alert('onclick');};
Solution 3 - Javascript
W3C suggests:
element.addEventListener('click',doSomething,false)
Microsoft uses:
element.attachEvent('onclick',doSomething)
You can do some feature detection and determine which call to use.
Solution 4 - Javascript
With no extra code in the html, here's a way to do it:
<html><body><head><script> // This script could be in an external JS file
function my_handler(elt) {
alert("Yay!");
return false;
}
function setup() {
document.getElementById('lady').onclick = my_handler;
}
window.onload = setup;
</script></head>
<body><a href='#' id='lady'>Test</a></body>
</html>
Solution 5 - Javascript
<script>
function tramtramtram(){
alert("tram it!");
}
</script>
<a href="#" onclick="tramtramtram()">tramtram</a>
Solution 6 - Javascript
var el =document.getElementById('lady'); el.addEventListener( "click", tramtramtram, false );
Solution 7 - Javascript
Execute this script when document loads (replacing alert with your stuff):
var rgLinks = document.getElementsByTagName("A");
for (var x=0; x<rgLinks.length; x++) {
el = rgLinks[x];
if (el.className == 'scroll-down' || el.className == 'scroll-down')
{
el.onclick = function () {alert('onclick');};
}
}
Maybe that is what you are asking about...
Solution 8 - Javascript
Just use the onclick attribute.
<a href="#" onclick="functionName(someParam)">
Or to do it from javascript,
document.getElementById("anchorID").onclick = function(){
some code
};
Solution 9 - Javascript
You need to use getElementById to add the onclick handler. However you need to initiate your code somewhere. Without jQuery you can only use the body onload handler:
<body onload="myinitfunction()">
myinitfunction can be in an external js file.