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Javascript If Else Statement

Posted on 2011-02-14
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Last Modified: 2012-05-11
What is the correct format to write javascript code that has an if else element to it? I have a form that is programmed in Java and each question on the form is broken up into sections. At the end of each section you have many options you can A.go on to next section B.save and exit form or C. write in javascript if there is more than one way to handle the question. An example of this is: If yes, go to next question, if no, jump to section 5. How would I write this portion of code in javascript?
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Question by:anshealth
11 Comments
 
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Assisted Solution

by:CCSOFlag
CCSOFlag earned 166 total points
ID: 34892384
not entirely sure what you are wanting, but no there is not a "goto" in javascript.  You need to use if else statements combined with functions to do what you want.

For example:

function Section5()
{
...code...
}

if (A)
{
...some code...
}
else if (B)
{
...some code...
}
else
{
  Section5();
}
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Expert Comment

by:Dave Baldwin
ID: 34892407
Further info on this page: http://www.w3schools.com/js/js_if_else.asp
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Accepted Solution

by:
Michel Plungjan earned 167 total points
ID: 34894421
@anshealth your question is very poorly worded and has no example code. If I were to ask the same question I would do something like

In the following html I have a form with several sections. After each section I need to have 3 choices
1) go to next section
2) save and exit and
3) write ???

<form>
part 1:
<input type="..." />

part 2:
<input type="..." />

part 3:
<input type="..." />
</form>

How do I write a function that.....

-----------------------

And please use the Code link under the comment box to put in code, or wrap in [ code ] code here [ /code ] like
this example here

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Expert Comment

by:Proculopsis
ID: 34894706

Here's a sample if else:

  if ( option == "next" ) {
    announce( "You selected 'Go to next section'." );
  } else {
    if ( option == "save" ) {
      announce( "You selected 'Save and Exit'." );
    } else {
      if ( option == "write" ) {
        announce( "You selected 'Write'." );
      }
    }
  }

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...but if you have many options then you might want to consider a switch statement:

  switch ( option ) {
    case "next":
      announce( "You selected 'Go to next section'." );
    break;
    case "save":
      announce( "You selected 'Save and Exit'." );
    break;
    case "write":
      announce( "You selected 'Write'." );
    break;
  }

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Here is a full working example:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_26821019.html</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">

jQuery(document).ready( function () {

  $("input.action").click( action );

});

function action() {
  var option = $(this).attr("id");

  switch ( option ) {
    case "next":
      announce( "You selected 'Go to next section'." );
    break;
    case "save":
      announce( "You selected 'Save and Exit'." );
    break;
    case "write":
      announce( "You selected 'Write'." );
    break;
  }

/* ***********************
  if ( option == "next" ) {
    announce( "You selected 'Go to next section'." );
  } else {
    if ( option == "save" ) {
      announce( "You selected 'Save and Exit'." );
    } else {
      if ( option == "write" ) {
        announce( "You selected 'Write'." );
      }
    }
  }
*********************** */

}

function announce( message ) {
  $("#result").text( message );
}

</script>
</head>
<body>

<input id="next" class="action" type="button" value="Next section" />  
<input id="save" class="action" type="button" value="Save and exit" />  
<input id="write" class="action" type="button" value="Write" />  

<fieldset><legend>Result</legend><span id="result">Click a button...</span></fieldset>

</body>
</html>

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Expert Comment

by:Michel Plungjan
ID: 34894739
Keen, are we?
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LVL 82

Expert Comment

by:leakim971
ID: 34906406
What about an object like this one ?
The number of each choice is the index of the next question(section)
var questions = [
	{
		"question":"What is your sexe",
		"choices": [{"Male":4}, {"Female":1}]
	},
	{ 
		"question":"Have you ever acouchi??",
		"choices": [{"Yes":2}, {"No":4}]
	},
	{ 
		"question":"How many children?",
		"choices": [{"Less or equal than 2":4}, {"More than 2":3}]
	},
	{ 
		"question":"At the same time?",
		"choices": [{"Yes":4}, {"No":4}]
	},
	{ 
		"question":"Test ended\nDo you want to restart it?",
		"choices": [{"Yes":5}, {"No":null}]
	}
	];

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0
 
LVL 82

Assisted Solution

by:leakim971
leakim971 earned 167 total points
ID: 34907668
Check this :


<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Question/Answer</title>
    <script language="javascript" type="text/javascript">
        var nextQuestionIndex = 0
        var questions = [{"question":"What is your sexe?","choices":[{"Male":4},{"Female":1}]},{"question":"Have you ever acouchi?","choices":[{"Yes":2},{"No":4}]},{"question":"How many children?","choices":[{"Less or equal than 2":4},{"More than 2":3}]},{"question":"At the same time?","choices":[{"Yes":4},{"No":4}]},{"question":"Test ended<br />Do you want to restart it?","choices":[{"Yes":0},{"No":-1}]}];
        var answers = [];
        window.onload = nextQA;

        function nextQA() {
            var choicesTable = document.getElementById("choices");
            var inputs = choicesTable.getElementsByTagName("input");
            for(var i=0;i<inputs.length;i++) {
                if(inputs[i].type=="radio" && inputs[i].checked) {
                    saveAnswer(inputs[i]);
                    nextQuestionIndex = inputs[i].value;
                }
            }
            if(nextQuestionIndex>=0) {
                if(nextQuestionIndex == 0) answers = [];
                document.getElementById("question").innerHTML = questions[nextQuestionIndex].question;
                while(choicesTable.rows.length>0) choicesTable.deleteRow(0);
                for(var i=0;i<questions[nextQuestionIndex].choices.length;i++) {
                    insertNewRowInTable(choicesTable, questions[nextQuestionIndex].choices[i])
                }
            }
            else {
                saveAnswers(answers);
                alert("bye!");
                location.href = "http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_26821019.html#a34906406"
            }
        }
        
        function insertNewRowInTable(table, obj) {
            for(var j in obj) break;            
            var row = table.insertRow(table.rows.length);
            var td = row.insertCell(0);
            
            try { rb = document.createElement("<input type=\"radio\" name=\"QA\" />"); } catch(e) { rb = document.createElement("input"); }
            rb.setAttribute("type","radio");
            rb.setAttribute("value",obj[j]);
            rb.setAttribute("name","QA");
            var lb = document.createElement("label");
            lb.innerHTML = j;
            td.appendChild(rb);
            td.appendChild(lb);
        }
        
        function saveAnswer(radio) {
            answers.push(radio.parentElement.getElementsByTagName("label")[0].innerHTML);
        }
        
        function saveAnswers(myArray) {
            // ajax operation to save the array in the database
        }

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <h1 id="question"></h1>
    <table id="choices"></table>
    <br />
    <input type="button" value="Next" onclick="nextQA();" />
    </form>
</body>
</html>

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Expert Comment

by:Michel Plungjan
ID: 34908878
Assuming our quiet asker use ASP
0
 
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Expert Comment

by:leakim971
ID: 34908975
eh eh @mplungjan
I checked its other posts before ;-) and we can remove the first line and  runat="server" lines 4 and 62, no problem
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LVL 75

Expert Comment

by:Michel Plungjan
ID: 34909064
'k...
0
 

Author Closing Comment

by:anshealth
ID: 34909210
thx
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