I was wondering what would be the best way to execute a java-script code only on specific pages.
Let's imagine we have a template-based web-site, rewrite rule for the content ist set, jquery available and it basically looks like this:
<!DOCTYPE html>
<html>
<head>
<script src="script.js"></script>
</head>
<body>
...
include $content;
..
</body>
</html>
content 'info' contains a button, we want something to happen on click, content 'alert' should give us a message when you hover a text field.
What is the best way to trigger these actions, without running into an error, because the object is not found?
Option one: using window.location.pathname
$(document).ready(function() {
if (window.location.pathname == '/info.php') {
$("#button1").click(function(){
//do something
})
}else if(window.location.pathname == '/alert.php'){
$("#mytextfield").hover(){
alert('message');
}
}
Option two: checking if elements exist
$(document).ready(function() {
if ($("#button1").length > 0) {
$("#button1").click(function(){
//do something
})
}else if ($("#mytextfield").length > 0){
$("#mytextfield").hover(){
alert('message');
}
}
Option three: include the script in the loaded template
//stands for itself
Is there a better solution? Or do I have to get along with one of these solutions?
Your experience, usage, or any links related to this topic are appreciated.
//EDIT:
I might have choosen a bad example, the actual code would be somethin like:
mCanvas = $("#jsonCanvas");
mMyPicture = new myPicture (mCanvas);
where the myPicture constructor get's the context of the canvas element, and throws an error, if mCanvas is undefined.
See Question&Answers more detail:
os 
