Whenever I declare it, the onclick method is executed

I have been attempting to define an onclick method that would trigger a function to clear and reconstruct the display, revealing more detailed information about the clicked item. However, I am facing an issue where the assigned onclick method is executed immediately upon assignment, resulting in only one item's details being displayed.

If you eliminate the line i.node.onclick, you will see five randomly positioned items that can be hovered over but not clicked on.

HTML

<html>  
   <head>  
      <title>Raphael Play</title>  
      <script type="text/javascript" src="Raphael.js"></script>  
      <script type="text/javascript" src="Test.js"></script>  
      <style type="text/css">  
        #map 
        {  
           width: 500px;  
           border: 1px solid #aaa;  
        }  
      </style>  
   </head>  
   <body>  
      <div id="map"></div>  
   </body>  
</html>  

JavaScript

var map;
var items = new Array();

window.onload = function() 
{  
   map = new Raphael(document.getElementById('map'), 500, 500);  

   for(cnt = 0; cnt < 5; cnt++)
   {
      var x = 5 + Math.floor(Math.random() * 490);
      var y = 5 + Math.floor(Math.random() * 490);

      items[cnt] = new Item(x, y);

      var i = map.circle(items[cnt].x, items[cnt].y, 8).attr({fill: "#000", stroke: "#f00", title: items[cnt].name}); 
      i.node.onclick = detailView(items[cnt]);
   }
} 

function Item(x, y)
{
   this.x = x;
   this.y = y;
   this.name = "Item[" + x + "," + y + "]";
}

function detailView(dv)
{
   map.clear();

   map.circle(250, 250, 25).attr({fill: "#0f0", stroke: "#f00", title: dv.name});
}

Answer №1

To start, create a helper function:

  function generateDetailFunction(item) {
    return function() { showDetails(item); };
  }

Next, assign the click handler in the following way:

  element.onclick = generateDetailFunction(items[index]);

The purpose of the helper function is to create a function that, when triggered, will execute your "showDetails()" function and pass along the corresponding item to be displayed. The issue in your initial code was that it directly called "showDetails()" during initialization instead of returning a function for the "onclick" attribute, which can be resolved by using the suggested helper function.

Answer №2

To make it work properly, you should assign a function to i.node.onclick instead of just the result of calling detailView(items[cnt]). The current setup sets i.node.onclick to the return value of detailView, which is undefined.

In order for it to function as expected, detailView should be modified to return a function itself.

function detailView(dv){
  return function(){
    map.clear();
    map.circle(250, 250, 25).attr({fill: "#0f0", stroke: "#f00", title: dv.name});
  };
}

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