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CSCI128 - Lab 11 - Solved

Introduction to Web Technology 

 Programming Exercise 

 Question 1. Create a web page and display the following:​ 

 
The web page allows the user to enter the coordinates of the 3 vertices of a triangle.

When the user clicks the button, then draw the triangle .

 

A median of a triangle is a straight line from a vertex to the midpoint of the opposite side. The drawing demonstrates a mathematical fact that: the 3 median lines intersect in a single point (which is called the triangle's centroid).

 

             

This is a sample code for draggable elements:

<tagName id="..."           draggable="true"           onDragStart="dragStart(event)"> 

 ... 

</tagName> 

 

function dragStart(event) 



  // get the drag element id   var dragId = event.target.id; 

  console.log("dragId=" + dragId); 

      

  // store the drag element id into the dataTransfer object   event.dataTransfer.setData("dragId", dragId); } 
 

 

This is a sample code for droppable elements:

<tagName id="..."  

         onDrop="drop(event)"           onDragOver="dragOver(event)"> 

 ... 

</tagName> 

 

function dragOver(event) 



  event.preventDefault(); 

}  

function drop(event) 



  // get the drop element ID   var dropId = event.target.id; 

  console.log("dropId=" + dropId); 

      

  // retrieve the drag element id from the dataTransfer object   var dragId = event.dataTransfer.getData("dragId");   console.log("dragId=" + dragId); 

      

  // do the dropping logic 

  // TO-DO 


Question 2. Create a web page and display the following:​ 

 

  

 

When an animal is dropped into a matching text then the corresponding counter is increased by 1. For example, if the cat is dropped correctly 3 times and the dog is dropped correctly 11 times then the web page shows the following:

 

  

 

 

             

Question 3. Create a web page and display the following:​ 

 

  

When an animal is dropped into a matching text then the web page will be updated in the following manner. For example, if the cat is dropped correctly 2 times and the dog is dropped correctly 3 times then the web page shows the following:

 

  

 


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