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Add comments to it by filling in the blank comments numbers 1 through 32. (The first...

Add comments to it by filling in the blank comments numbers 1 through 32. (The first few comments are HTML comments, not JavaScript comments, and are bracketed according to <!- this is an HTML comment>.)


<!DOCTYPE html>
<html>
<body onload="handleFormAction()">


<h2>Form handling example in JavaScript</h2>
<h3>(Or, John Doe meets Robbie Robot)</h3>
<h4>Instructions: Fill in the form. Then fill in comments 1 through 23 in the JavaScript code!</h4>


<form target="_blank" action= > <!- 1: replace this placeholder HTML comment with a real comment>
Type your first name:
<br> <!- 2: replace this placeholder HTML comment with a real comment>
<input type="text" name="firstName" value="John"> <!- 3: replace this placeholder HTML comment with a real comment>
<br>
...and last name:
<br>
<input type="text" name="lastName" value="Doe">
<br>
<input type="submit" value="Click to submit form"> <!- 4: replace this placeholder HTML comment with a real comment>
</form>
<br><br>

<p id="demo"> <!- 5: replace this placeholder HTML comment with a real comment>
<b>The analysis of the form data will appear here:</b>
</p>

<script>
//6
function handleFormAction(){
//7
if (window.location.href.indexOf("?")>-1)
//8
processFormData();
}
//9
function processFormData(){
//10
var fullURLstring=window.location.href;
//11
document.getElementById('demo').innerHTML
+= "<br>fullURLstring is: "+fullURLstring;
//12
var separate_argsPassedIn=fullURLstring.split("?");
//13
document.getElementById('demo').innerHTML
+= "<br>fullURLstring is: "+ separate_argsPassedIn;
//14
document.getElementById('demo').innerHTML
+= "<br>Notice '?' is removed and parts are now separated by a comma";
//15
var tempArray=['a','b','c','d','e'];
//16
document.getElementById('demo').innerHTML
+= "<br>array ['a','b','c','d','e'] prints out as: "
+ tempArray;
//17
document.getElementById('demo').innerHTML
+= "<br>That should remind you what .split() returns.";
//18
var argsPassedIn=separate_argsPassedIn[1];
//19
document.getElementById('demo').innerHTML
+= "<br>"+argsPassedIn;
//20
var arrayOfArgs=argsPassedIn.split("&");
//21
document.getElementById('demo').innerHTML
+= "<br>"+arrayOfArgs;
//22
var arg1=arrayOfArgs[0];
//23
var arg2=arrayOfArgs[1];
//24
document.getElementById('demo').innerHTML
+= "<br>"+arg1;
//25
document.getElementById('demo').innerHTML
+= "<br>"+arg2;
//26
var separate_firstName = arg1.split("=");
//27
var separate_lastName = arg2.split("=");
//28
var firstName=separate_firstName[1];
//29
var lastName =separate_lastName [1];
//30
document.getElementById('demo').innerHTML
+= "<br>"+firstName;
//31
document.getElementById('demo').innerHTML
+= "<br>"+lastName;
//32
document.getElementById('demo').innerHTML
+= "<br>Good afternoon, "+lastName+". I am Robot, but please call me Robbie. May I call you "+firstName+"?";
}
</script>

</body>
</html>

engineering   Computer-Science   
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Homework Answers

Answer #1

Each line number refers to each comment:

  1. Open form in new Tab.
  2. Break to next line.
  3. Take name input as text.
  4. Submit the form.
  5. provide unique id = "demo" to paragraph tag.
  6. ** Javascript for Form Handling **
  7. Checks for a valid get request
  8. Calls processFormData function
  9. Define ProcessFormData function
  10. Get window url.
  11. adds window url to the p tag w
  12. Splits the string on "?" to obtain GET params
  13. adds request param to p tag
  14. add string to p tag
  15. initialize array
  16. append array as html in p tag
  17. appends line break and string to p tag
  18. get the first argument for list
  19. append argument 1 to p tag
  20. creates array of passed in argument split at "&"
  21. append the created array to p tag
  22. get first element from arrayOfArgs
  23. get second element from arrayOfArgs
  24. append arg1 to p tag
  25. append arg2 to p tag
  26. split arg1 at "=" to get form input value
  27. split arg2 at "="
  28. get first_name from splited array
  29. get last name from splited array
  30. append first name to p tag
  31. append last name to p tag
  32. append string to p tag with last name and first name included

Hope this helps!

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