Reference no: EM132104022

Problem: Create a web page that contains a table of buttons that should apply various styles to a paragraph according to the specifications listed in subsequent sections.

The web page must provide the user a preview of the new style before the change is applied.

The page must also support resetting the style back to the default using event handlers and functions.

You will need use the getElementById() JS method to address multiple HTML elements within your webpage.

In the body of the page create a table with 4 rows such that: the first and second rows have 4 cells, the third row has a single cell, and the fourth row has 2 cells. Fill in the table as described below so that it is similar to the following example

The first row will contain the column headings. They contain the following text: Font Size, Font Family, Font Color, and Background Color.

The second row will contain the buttons that will change the property described in the respective column. Give each button a value[1] (attribute) that corresponds to the new value that will be assigned to the respective property. E.g., underneath "Font Size" the button must display the text "14pt".

Second Row must contain the following values: FontSize:14pt FontFamily:Verdana FontColor:Red BackgroundColor:Yellow

The third row must contain a paragraph element. You will need a single td element (Hint: use colspan). The paragraph tag must have an id attribute, and for the content of the paragraph write about the advantages/disadvantages of the DuckDuckGo search engine vs Google search engine.

The fourth row will contain two buttons with the attribute value set to Reload and Define.

Use an internal style sheet with CSS rules that accomplish the following:

Set the paragraph element's font color to black, background color to white, font size to 12pt, and font family to "Arial".

Set the td element's width to 180px, and height to 80px

Set the th element's text align to center.

Set the input element's width to 100% and font family to "Times New Roman".

Change the background color of all th elements to any color of your choice.

Part b-II - Event handlers & JavaScript

For each button in the second row add an onclick event handler that will update the style of the paragraph to the value1 indicated by the button. Use document.getElementById() function to refer to the paragraph by the id you gave it earlier.

For each heading in the first row add an ondblclick event handler to each th element that will reset the style of the paragraph to the defaults you defined in the style sheet for the paragraph element.

For each button in the second row use the onmouseover event handler to give the user a preview of the style that will be applied by modifying the style of the button itself to reflect the change.[2] Use the onmouseout event handler to reset the style back to the default values

(Hint: The default values are the same as what you have explicitly specified in your internal CSS. Use this.style.property=value to change the button's style for the onmouseover and onmouseout event handlers. )

For the Reload button the onclick event handler should reload the page by calling the window.location.reload() function.

For the Define button the onclick event handler should define a word selected or highlighted by the user, using a custom function named defineSelection(), that will be described next. (Note: you must use either Chrome or Firefox for this part, IE will not render this properly.)

Add a script element to the head element that contains the defineSelection() function declaration:

The basic syntax for declaring a function can be found in your notes, on pg. 24 in the DOM Scripting textbook, or by Googling "JavaScript function."

This function must have a single statement (highlighted in yellow) that will change the window location to a Google search results page. In the statement we are concatenating two strings (a URL and the string returned by the getSelection() window method) and assigning the result to the window location property.

window.location='https://www.google.com/search?hl=en&q=define:'+window.getSelection();

Part b-III - Test cases

When you click on a button in the second row it should change the style of the paragraph in the way indicated by the button.

When you double click on a property name in the first row (event handler in the th element) it should change the style of the paragraph back to the default (specified by you in the style sheet).

When you move your mouse over a button in the second row the button's style should change in the way indicated by the button. (i.e., in the way that the paragraph's style would change if you clicked on the button (test case 2).) When you move your mouse off of the button the button's style should change back to its default.

When you click on the reload button the page should reload.

When you select a word in the paragraph (highlight it with your cursor by clicking and holding as you move the cursor over a word) and then click the define button, a Google page with the definition of the word should load. (Note: you cannot use IE for this step, IE does not correctly implement the getSelection() window method.)

[1] value in this context refers to the value attribute of the input element, i.e., the text displayed on the button, not value in the CSS sense of property and property value.

[2] E.g., if the button will change the color of the paragraph text to red when clicked on, then moving the cursor over the button should change the color of the button text to red (e.g., this.style.color='red'). When the user moves the cursor off of the button the color of the button should change back to the default color (black).