How to find variable in a String list in DukeScript

I have created a search word example but it seems that is not doing the string search when the button is clicked against a constant properly.

HTML:

<h1>Java Dictionary</h1>
<hr>
<h2 data-bind="text: searchPhrase"></h2>
<button data-bind:"click: changeFP">Search</button>

<h2 data-bind="text: foundPhrase, enable:isInCatalog"></h2>

JAVA:

package dew.demo.ko4j;
import net.java.html.json.*;

@Model(className="Dictionary", properties={
  @Property(name="searchPhrase", type=String.class),
  @Property(name="foundPhrase", type=String.class)
})

class Demo {

  @ComputedProperty static boolean isInCatalog(String searchPhrase) {
    if(searchPhrase.equalsIgnoreCase("Hello World!")){
      return true;
    }
     return false;
  }  

  @Function static void changeFP(Dictionary model){
    if( model.isIsInCatalog( ) ){
        model.setFoundPhrase("found");
    }
  }

  static {
    Dictionary model=new Dictionary("Hello World!","please click to search");
    model.applyBindings();
  }
}

PS: Please use DEW to try the example because it's where I tested.

EDIT: Ideal Scenario

1. the window shows "Hello World!" and "please cick to search" messages.
2. user clicks button button
3. "please cick to search" message changes to "found"

DEW should have shown you one syntax error in your HTML code by highlighting it in red color. The data-bind attribute on button is no valid html. You're using a colon ":" instead of equals "=". Therefore your action is never called.

When using NetBeans it's easier to spot, because NB also gives you the error message explaining what is wrong.

Here's the updated example.