Hi All,
I wrote some code but it doesn't work.
------------------------------------------
<html>
<head>
<script src="my_broken_script.js"></script>
</head>
<body>
Hello World
</body>
</html>
------------------------------------------
// my_broken_script.js
var MyClass = {
init : function() {
var injectCode = '<button onclick="MyClass.btnClickHandler"
id="btn1">Button 1</button>';
var bd = document.body;
bd.innerHTML = injectCode + bd.innerHTML;
},
btnClickHander : function() {
alert('Done');
}
}
MyClass.init(); // <-- Error
------------------------------------------
Browser says "MyClass" has no property. But if I replace
onclick="MyClass.btnClickHandler" with onclick="alert(0)", it works. How
to bind an event to MyClass.btnClickHander ?
BTW: If I bind this event using Prototype, it works.
--
Xu, Qian (stanleyxu)
8  1104 
"Xu, Qian" wrote:
------------------------------------------
<html>
<head>
<script src="my_broken_script.js"></script>
</head>
<body>
Hello World
</body>
</html>
------------------------------------------
// my_broken_script.js
var MyClass = {
init : function() {
var injectCode = '<button onclick="MyClass.btnClickHandler"
id="btn1">Button 1</button>';
var bd = document.body;
bd.innerHTML = injectCode + bd.innerHTML;
},
btnClickHander : function() {
alert('Done');
}
}
MyClass.init(); // <-- Error
------------------------------------------
Browser says "MyClass" has no property. But if I replace
onclick="MyClass.btnClickHandler" with onclick="alert(0)", it works. How
to bind an event to MyClass.btnClickHander ?
A few changes help:
<html>
<head>
<script src="my_broken_script.js"></script>
</head>
<body>
Hello World
</body onload = MyClass.init()>
----------^ so that the DOM is complete
</html>
// my_broken_script.js
var MyClass = {
init : function() {
var injectCode = '<button onclick="MyClass.btnClickHandler()"
------------------------------------------------------------------^ brackets
id="btn1">Button 1</button>';
var bd = document.body;
bd.innerHTML = injectCode + bd.innerHTML;
},
btnClickHandler : function() {
----------------^ spelling "l" missing
alert('Done');
}
}
// MyClass.init();
^ now in onload
Tom
Tom de Neef wrote:
>
// MyClass.init();
^ now in onload
Tom
Thanks, but this does not help. I am more interested in Why?
--
Best regards
Xu, Qian (stanleyxu) http://stanleyxu2005.blogspot.com/
Tom de Neef wrote:
>
// MyClass.init();
^ now in onload
Tom
Thanks Tom, but this does not help. I am more interested in Why?
One thing I do not get, when button is clicked successfully,
MyClass.btnClickHandler would be called. I called "alert(this.tagName)",
it is "BUTTON" not "MyClass". The "this" pointer should not be MyClass?
--
Best regards
Xu, Qian (stanleyxu) http://stanleyxu2005.blogspot.com/
"Xu, Qian"wrote:
>>
// MyClass.init();
^ now in onload
Tom
Thanks Tom, but this does not help. I am more interested in Why?
One thing I do not get, when button is clicked successfully,
MyClass.btnClickHandler would be called. I called "alert(this.tagName)",
it is "BUTTON" not "MyClass". The "this" pointer should not be MyClass?
I suggested three changes. I tested the code with these changes. It works
fine.
Tom
Xu, Qian escribió:
<html>
<head>
<script src="my_broken_script.js"></script>
</head>
<body>
Hello World
</body>
</html>
------------------------------------------
// my_broken_script.js
var MyClass = {
init : function() {
var injectCode = '<button onclick="MyClass.btnClickHandler"
id="btn1">Button 1</button>';
var bd = document.body;
bd.innerHTML = injectCode + bd.innerHTML;
},
btnClickHander : function() {
alert('Done');
}
}
MyClass.init(); // <-- Error
I get this error:
bd has no properties
bd.innerHTML = injectCode + bd.innerHTML;
You call init() from <headtag, with no timer or event handling. At
that point, it's likely that the isn't any <bodyyet.
You should launch init() when page has loaded or when DOM is ready:
window.onload=function(){
MyClass.init();
};
The above lines are only a quick example, it's not the recommended way
to do it because you'll overwrite any other onload actions you may have
defined. If you get the addEvent() function from: http://dean.edwards.name/weblog/2005/10/add-event2/
.... you could change this into:
addEvent(window, "load", function(){
MyClass.init();
});
You can also Google for "onDomReady" or "domReady".
--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://bits.demogracia.com
-- Mi web de humor al baño María: http://www.demogracia.com
--
Tom de Neef wrote:
"Xu, Qian"wrote:
>>// MyClass.init();
^ now in onload
Tom
Thanks Tom, but this does not help. I am more interested in Why?
One thing I do not get, when button is clicked successfully,
MyClass.btnClickHandler would be called. I called "alert(this.tagName)",
it is "BUTTON" not "MyClass". The "this" pointer should not be MyClass?
I suggested three changes. I tested the code with these changes. It works
fine.
Tom
Thanks, it was my fault.
1. It works when I use attachEventListner (for Firefox)
2. I should write
this.btnClickHander = function() {
// accessing methods or properties of another class works now ;)
}
--
Xu, Qian (stanleyxu) http://stanleyxu2005.blogspot.com
Álvaro G. Vicario wrote:
Xu, Qian escribió:
><html>
<head>
<script src="my_broken_script.js"></script>
</head>
<body>
Hello World
</body>
</html>
------------------------------------------
// my_broken_script.js
var MyClass = {
init : function() {
var injectCode = '<button onclick="MyClass.btnClickHandler"
id="btn1">Button 1</button>';
var bd = document.body;
bd.innerHTML = injectCode + bd.innerHTML;
},
btnClickHander : function() {
alert('Done');
}
}
MyClass.init(); // <-- Error
I get this error:
bd has no properties
bd.innerHTML = injectCode + bd.innerHTML;
You call init() from <headtag, with no timer or event handling. At
that point, it's likely that the isn't any <bodyyet.
You should launch init() when page has loaded or when DOM is ready:
window.onload=function(){
MyClass.init();
};
The above lines are only a quick example, it's not the recommended way
to do it because you'll overwrite any other onload actions you may have
defined. If you get the addEvent() function from:
http://dean.edwards.name/weblog/2005/10/add-event2/
... you could change this into:
addEvent(window, "load", function(){
MyClass.init();
});
You can also Google for "onDomReady" or "domReady".
Thanks for the tip. Yes, I should wait until the DOM tree has been
loaded completely. Currently I use attachEventListner for Firefox and it
works.
--
Xu, Qian (stanleyxu) http://stanleyxu2005.blogspot.com
this.btnClickHander = function() {
I think you still miss an "l": Handler instead of Hander
Tom
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