1
Just add following functions to your web page's body tag.
one drawback is it will not work in mozilla, but we have another workaround for this,just add onmousedown function also in the body tag:
as we added in body tag, you can add these functions in any elements of your web pages for preventing selection
Posted on 1:30 AM by prajeesh and filed under
Tips and Tricks
In my previous post I discussed about disabling the right context menu in a web page , here we can discuss on how to prevent text selection in the web page, if you want to prevent normal users copying content of your web page then it will be useful.
Just add following functions to your web page's body tag.
- <body ondragstart="return false;" onselectstart="return false;">
one drawback is it will not work in mozilla, but we have another workaround for this,just add onmousedown function also in the body tag:
- <body ondragstart="return false;" onselectstart="return false;" onmousedown ="return false;" >
as we added in body tag, you can add these functions in any elements of your web pages for preventing selection
0
Alternatively, you can show an alert saying "Right click disabled" if you call a function from body tag's oncontextmenu event, for eg:-
Disclaimer: I have tested this functions in IE7 and Mozilla 3.0 only , it will not work in Opera.
Enjoy coding
Posted on 9:46 PM by prajeesh and filed under
Tips and Tricks
Some websites does not allow right click context menu option for security reasons, you can also achieve this by adding following code to your body tag of the page.
- <body oncontextmenu="return false;" >
Alternatively, you can show an alert saying "Right click disabled" if you call a function from body tag's oncontextmenu event, for eg:-
- <script language ="javascript">
- function contextalert() {
- alert("Right click disabled");
- return false;
- }
- </script>
- <body oncontextmenu="return contextalert();" >
Disclaimer: I have tested this functions in IE7 and Mozilla 3.0 only , it will not work in Opera.
Enjoy coding
0
Please note that it will not work in Mozilla.
Posted on 9:12 PM by prajeesh and filed under
Tips and Tricks
In some websites you may have noticed a fade effect while browsing the pages, we may feel an ajax effect and may not feel slow page load, just add the following meta tag to your page before the body tag.
- <meta http-equiv="Page-Exit" content="progid:DXImageTransform.Microsoft.Fade(duration=.9)">
Please note that it will not work in Mozilla.
2
Sometimes you may need to call a method in the parent page from a child user control, for eg:- we have a user control with New, Save, Delete buttons and based on the page type we may need to call appropreate methods.
Before going to actual aim of this post we must have an idea about delegates and event handlers.
What is a delegate & how should we use it?
A deligate is just like a function pointer in c/c++ , delegates can be used to call a method where the call method can be determined only at run time.
How can we declare, instantiate and call a deligate?
Suppose we have a method to add two numbers and display the result in the webpage.
Step 1 : Declaring a delegate
where delegate is a keyword and void is the return type of the delegate.
Step 2: Instantiating and calling the delegate
where "objDisDelegate" is the delegate variable and "AddNumbers" is the function to be called, note that signature of the AddNumbers function must be similer to the delegate we declared, that is it must accept two integer parameters and returns void, when we instantiate the delegate object we are pointing the AddNumbers function to the delegate variable, we can use delegate variable to call the method by passing the values, here we are calling only one function using this delegate this is called single cast delegate, you can also use delegates to call multiple functions also this type of delegates are called multi cast delegates.
Calling a method in a parent page from a user control :
Suppose we have two text boxes and an add button in the user control and we want to call a method to add two numbers declared in the parent page and display result in the same page.
Step 1: Declare the delegate and event in user control.
Step 2:Passing the parmeters to the delegate from click event of the Add button in the user control
Step 3:Declare the add method in parent page.
Step 4: Instantiate the delegate from the page load event of the parent page.
and you are done, hope you enjoyed this post.
Before going to actual aim of this post we must have an idea about delegates and event handlers.
What is a delegate & how should we use it?
A deligate is just like a function pointer in c/c++ , delegates can be used to call a method where the call method can be determined only at run time.
How can we declare, instantiate and call a deligate?
Suppose we have a method to add two numbers and display the result in the webpage.
Step 1 : Declaring a delegate
- public delegate void SumOfTheNumbers(int a, int b);
where delegate is a keyword and void is the return type of the delegate.
Step 2: Instantiating and calling the delegate
- DisplayNumbersDelegate objDisDelegate = new DisplayNumbersDelegate(AddNumbers);
- objDisDelegate(5 ,10 );
where "objDisDelegate" is the delegate variable and "AddNumbers" is the function to be called, note that signature of the AddNumbers function must be similer to the delegate we declared, that is it must accept two integer parameters and returns void, when we instantiate the delegate object we are pointing the AddNumbers function to the delegate variable, we can use delegate variable to call the method by passing the values, here we are calling only one function using this delegate this is called single cast delegate, you can also use delegates to call multiple functions also this type of delegates are called multi cast delegates.
Calling a method in a parent page from a user control :
Suppose we have two text boxes and an add button in the user control and we want to call a method to add two numbers declared in the parent page and display result in the same page.
Step 1: Declare the delegate and event in user control.
- public delegate void SumOfTheNumbers(int a, int b);
- public event SumOfTheNumbers sumnos;
Step 2:Passing the parmeters to the delegate from click event of the Add button in the user control
- protected void btnAdd_Click(object sender, EventArgs e)
- {
- sumnos(int.Parse(txtBoxNum1.Text), int.Parse(txtBoxNum2.Text));
- }
Step 3:Declare the add method in parent page.
- public void sumofthenumber(int a, int b)
- {
- Response.Output.Write("sum of{0} and {1} is : {3} ",a,b,a+b);
- }
Step 4: Instantiate the delegate from the page load event of the parent page.
- protected void Page_Load(object sender, EventArgs e)
- {
- delControl1.sumnos += new TestProject.UserControls.delControl.SumOfTheNumbers(sumofthenumber);
- }
and you are done, hope you enjoyed this post.
0
Me and my wife Dhanya are enjoying the new life of parenthood with her :).
See her photo taken on 28th day :
Posted on 9:52 PM by prajeesh and filed under
Personal
Eventhough it is a tech blog, in this post i would like to share my happiness of being a father. We blessed with a baby girl on October 20th this year (2009) , we named her "Prarthana" meaning is Prayer.Me and my wife Dhanya are enjoying the new life of parenthood with her :).
See her photo taken on 28th day :
