coldfusion.html.markdown

---
language: coldfusion
filename: learncoldfusion.cfm
contributors:
    - ["Wayne Boka", "http://wboka.github.io"]
    - ["Kevin Morris", "https://twitter.com/kevinmorris"]
---

ColdFusion is a scripting language for web development.
[Read more here.](http://www.adobe.com/products/coldfusion-family.html)

### CFML
_**C**old**F**usion **M**arkup **L**anguage_  
ColdFusion started as a tag-based language. Almost all functionality is available using tags.

```cfm
<em>HTML tags have been provided for output readability</em>

<!--- Comments start with "<!---" and end with "--->" --->
<!---
    Comments can
    also
    span
    multiple lines
--->

<!--- CFML tags have a similar format to HTML tags. --->
<h1>Simple Variables</h1>
<!--- Variable Declaration: Variables are loosely typed, similar to javascript --->
<p>Set <b>myVariable</b> to "myValue"</p>
<cfset myVariable = "myValue" />
<p>Set <b>myNumber</b> to 3.14</p>
<cfset myNumber = 3.14 />

<!--- Displaying simple data --->
<!--- Use <cfoutput> for simple values such as strings, numbers, and expressions --->
<p>Display <b>myVariable</b>: <cfoutput>#myVariable#</cfoutput></p><!--- myValue --->
<p>Display <b>myNumber</b>: <cfoutput>#myNumber#</cfoutput></p><!--- 3.14 --->

<hr />

<h1>Complex Variables</h1>
<!--- Declaring complex variables --->
<!--- Declaring an array of 1 dimension: literal or bracket notation --->
<p>Set <b>myArray1</b> to an array of 1 dimension using literal or bracket notation</p>
<cfset myArray1 = [] />
<!--- Declaring an array of 1 dimension: function notation --->
<p>Set <b>myArray2</b> to an array of 1 dimension using function notation</p>
<cfset myArray2 = ArrayNew(1) />

<!--- Outputting complex variables --->
<p>Contents of <b>myArray1</b></p>
<cfdump var="#myArray1#" /> <!--- An empty array object --->
<p>Contents of <b>myArray2</b></p>
<cfdump var="#myArray2#" /> <!--- An empty array object --->

<!--- Operators --->
<!--- Arithmetic --->
<h1>Operators</h1>
<h2>Arithmetic</h2>
<p>1 + 1 = <cfoutput>#1 + 1#</cfoutput></p>
<p>10 - 7 = <cfoutput>#10 - 7#<br /></cfoutput></p>
<p>15 * 10 = <cfoutput>#15 * 10#<br /></cfoutput></p>
<p>100 / 5 = <cfoutput>#100 / 5#<br /></cfoutput></p>
<p>120 % 5 = <cfoutput>#120 % 5#<br /></cfoutput></p>
<p>120 mod 5 = <cfoutput>#120 mod 5#<br /></cfoutput></p>

<hr />

<!--- Comparison --->
<h2>Comparison</h2>
<h3>Standard Notation</h3>
<p>Is 1 eq 1? <cfoutput>#1 eq 1#</cfoutput></p>
<p>Is 15 neq 1? <cfoutput>#15 neq 1#</cfoutput></p>
<p>Is 10 gt 8? <cfoutput>#10 gt 8#</cfoutput></p>
<p>Is 1 lt 2? <cfoutput>#1 lt 2#</cfoutput></p>
<p>Is 10 gte 5? <cfoutput>#10 gte 5#</cfoutput></p>
<p>Is 1 lte 5? <cfoutput>#1 lte 5#</cfoutput></p>

<h3>Alternative Notation</h3>
<p>Is 1 == 1? <cfoutput>#1 eq 1#</cfoutput></p>
<p>Is 15 != 1? <cfoutput>#15 neq 1#</cfoutput></p>
<p>Is 10 > 8? <cfoutput>#10 gt 8#</cfoutput></p>
<p>Is 1 < 2? <cfoutput>#1 lt 2#</cfoutput></p>
<p>Is 10 >= 5? <cfoutput>#10 gte 5#</cfoutput></p>
<p>Is 1 <= 5? <cfoutput>#1 lte 5#</cfoutput></p>

<hr />

<!--- Control Structures --->
<h1>Control Structures</h1>

<cfset myCondition = "Test" />

<p>Condition to test for: "<cfoutput>#myCondition#</cfoutput>"</p>

<cfif myCondition eq "Test">
    <cfoutput>#myCondition#. We're testing.</cfoutput>
<cfelseif myCondition eq "Production">
    <cfoutput>#myCondition#. Proceed Carefully!!!</cfoutput>
<cfelse>
    myCondition is unknown
</cfif>

<hr />

<!--- Loops --->
<h1>Loops</h1>
<h2>For Loop</h2>
<cfloop from="0" to="10" index="i">
	<p>Index equals <cfoutput>#i#</cfoutput></p>
</cfloop>

<h2>For Each Loop (Complex Variables)</h2>

<p>Set <b>myArray3</b> to [5, 15, 99, 45, 100]</p>

<cfset myArray3 = [5, 15, 99, 45, 100] />

<cfloop array="#myArray3#" index="i">
	<p>Index equals <cfoutput>#i#</cfoutput></p>
</cfloop>

<p>Set <b>myArray4</b> to ["Alpha", "Bravo", "Charlie", "Delta", "Echo"]</p>

<cfset myArray4 = ["Alpha", "Bravo", "Charlie", "Delta", "Echo"] />

<cfloop array="#myArray4#" index="s">
	<p>Index equals <cfoutput>#s#</cfoutput></p>
</cfloop>

<h2>Switch Statement</h2>

<p>Set <b>myArray5</b> to [5, 15, 99, 45, 100]</p>

<cfset myArray5 = [5, 15, 99, 45, 100] />

<cfloop array="#myArray5#" index="i">
	<cfswitch expression="#i#">
		<cfcase value="5,15,45" delimiters=",">
			<p><cfoutput>#i#</cfoutput> is a multiple of 5.</p>
		</cfcase>
		<cfcase value="99">
			<p><cfoutput>#i#</cfoutput> is ninety-nine.</p>
		</cfcase>
		<cfdefaultcase>
			<p><cfoutput>#i#</cfoutput> is not 5, 15, 45, or 99.</p>
		</cfdefaultcase> 
	</cfswitch> 
</cfloop>

<hr />

<h1>Converting types</h1>

<style>
	table.table th, table.table td {
		border: 1px solid #000000;
		padding: 2px;
	}
	
	table.table th {
		background-color: #CCCCCC;
	}
</style>

<table class="table" cellspacing="0">
	<thead>
		<tr>
			<th>Value</th>
			<th>As Boolean</th>
			<th>As number</th>
			<th>As date-time</th>
			<th>As string</th>
		</tr>
	</thead>
	<tbody>
		<tr>
			<th>"Yes"</th>
			<td>TRUE</td>
			<td>1</td>
			<td>Error</td>
			<td>"Yes"</td>
		</tr>
		<tr>
			<th>"No"</th>
			<td>FALSE</td>
			<td>0</td>
			<td>Error</td>
			<td>"No"</td>
		</tr>
		<tr>
			<th>TRUE</th>
			<td>TRUE</td>
			<td>1</td>
			<td>Error</td>
			<td>"Yes"</td>
		</tr>
		<tr>
			<th>FALSE</th>
			<td>FALSE</td>
			<td>0</td>
			<td>Error</td>
			<td>"No"</td>
		</tr>
		<tr>
			<th>Number</th>
			<td>True if Number is not 0; False otherwise.</td>
			<td>Number</td>
			<td>See &#34;Date-time values&#34; earlier in this chapter.</td>
			<td>String representation of the number (for example, &#34;8&#34;).</td>
		</tr>
		<tr>
			<th>String</th>
			<td>If "Yes", True <br>If "No", False <br>If it can be converted to 0, False <br>If it can be converted to any other number, True</td>
			<td>If it represents a number (for example, &#34;1,000&#34; or &#34;12.36E-12&#34;), it is converted to the corresponding number.</td>
			<td>If it represents a date-time (see next column), it is converted to the numeric value of the corresponding date-time object. <br>If it is an ODBC date, time, or timestamp (for example &#34;{ts &#39;2001-06-14 11:30:13&#39;}&#34;, or if it is expressed in a standard U.S. date or time format, including the use of full or abbreviated month names, it is converted to the corresponding date-time value. <br>Days of the week or unusual punctuation result in an error. <br>Dashes, forward-slashes, and spaces are generally allowed.</td>
			<td>String</td>
		</tr>
		<tr>
			<th>Date</th>
			<td>Error</td>
			<td>The numeric value of the date-time object.</td>
			<td>Date</td>
			<td>An ODBC timestamp.</td>
		</tr>
	</tbody>
</table>

<hr />

<h1>Components</h1>

<em>Code for reference (Functions must return something to support IE)</em>
```
```cfs
<cfcomponent>
	<cfset this.hello = "Hello" />
	<cfset this.world = "world" />

	<cffunction name="sayHello">
		<cfreturn this.hello & ", " & this.world & "!" />
	</cffunction>
	
	<cffunction name="setHello">
		<cfargument name="newHello" type="string" required="true" />
		
		<cfset this.hello = arguments.newHello />
		 
		<cfreturn true />
	</cffunction>
	
	<cffunction name="setWorld">
		<cfargument name="newWorld" type="string" required="true" />
		
		<cfset this.world = arguments.newWorld />
		 
		<cfreturn true />
	</cffunction>
	
	<cffunction name="getHello">
		<cfreturn this.hello />
	</cffunction>
	
	<cffunction name="getWorld">
		<cfreturn this.world />
	</cffunction>
</cfcomponent>

<cfset this.hello = "Hello" />
<cfset this.world = "world" />

<cffunction name="sayHello">
	<cfreturn this.hello & ", " & this.world & "!" />
</cffunction>

<cffunction name="setHello">
	<cfargument name="newHello" type="string" required="true" />
	
	<cfset this.hello = arguments.newHello />
	 
	<cfreturn true />
</cffunction>

<cffunction name="setWorld">
	<cfargument name="newWorld" type="string" required="true" />
	
	<cfset this.world = arguments.newWorld />
	 
	<cfreturn true />
</cffunction>

<cffunction name="getHello">
	<cfreturn this.hello />
</cffunction>

<cffunction name="getWorld">
	<cfreturn this.world />
</cffunction>


<b>sayHello()</b>
<cfoutput><p>#sayHello()#</p></cfoutput>
<b>getHello()</b>
<cfoutput><p>#getHello()#</p></cfoutput>
<b>getWorld()</b>
<cfoutput><p>#getWorld()#</p></cfoutput>
<b>setHello("Hola")</b>
<cfoutput><p>#setHello("Hola")#</p></cfoutput>
<b>setWorld("mundo")</b>
<cfoutput><p>#setWorld("mundo")#</p></cfoutput>
<b>sayHello()</b>
<cfoutput><p>#sayHello()#</p></cfoutput>
<b>getHello()</b>
<cfoutput><p>#getHello()#</p></cfoutput>
<b>getWorld()</b>
<cfoutput><p>#getWorld()#</p></cfoutput>
```

### CFScript
_**C**old**F**usion **S**cript_  
In recent years, the ColdFusion language has added script syntax to mirror tag functionality. When using an up-to-date CF server, almost all functionality is available using scrypt syntax.

## Further Reading

The links provided here below are just to get an understanding of the topic, feel free to Google and find specific examples.

1. [Coldfusion Reference From Adobe](https://helpx.adobe.com/coldfusion/cfml-reference/topics.html)
2. [Open Source Documentation](http://cfdocs.org/)