Gregory's Blog

ColdFusion arrays can't use zero as an index.


I should have known better, but I had forgot that you can't use a zero as an index when constructing a ColdFusion array. On this blog, I have 14 different themes, and 39 settings for each theme, and created an array stored in the application scope to store the values in. I wanted to use a zero as an index to identify the name of the theme, and then use 1 through 39 as the theme setting. However, when I tried this approach I received the following error: "A scalar value of type java.lang.String cannot be assigned to a 2-dimensional ColdFusion array." The problem was solved when I used 1 instead of 0 as the first index. I have always thought that this was odd as assigning a zero index shouldwork. Most other languages default to a zero on the first array item, and still mistakenly assumed that this would work here. Here was my original code that caused this error:

<!--- Theme --->
<cfset application.arrThemeSettingsFromIniStore[1][0] = "black"><!--- black --->
<!--- Theme variables --->
<cfset application.arrThemeSettingsFromIniStore[1][1] = trim(getSettingsByTheme('black').useCustomTheme)><!--- useCustomTheme --->
more custom theme settings...

The code should not use a zero based index like so:

<!--- Theme --->
<cfset application.arrThemeSettingsFromIniStore[1][1] = "black"><!--- black --->
<!--- Theme variables --->
<cfset application.arrThemeSettingsFromIniStore[1][2] = trim(getSettingsByTheme('black').useCustomTheme)><!--- useCustomTheme --->
more custom theme settings...

This entry was posted on May 25, 2019 at 2:31 AM and has received 811 views.

Data types may be different between ColdFusion and jQuery.


The component and the method are the same, but the evaluation of the return value is different between ColdFusion and jQuery. Be aware that if you don't declare and set the datatype of the structure elements independently; the datatypes can be interpreted differently depending upon where they are being evaluated.

This entry was posted on May 18, 2019 at 7:13 PM and has received 565 views.

JSON Parse Error in jQuery when using a Coldfusion function inside a .cfm page.


Late at night, I put a function inside a .cfm template and tried to consume it from Ajax, but I received a json parse error that was displayed in Chrome's console when trying to invoke a function within a .cfm page. I had forgot that ajax functions should not be consuming a .cfm page, and placed the exact same function within a component with a .cfc extension, and the issue went away. When a function is within a component with the access remote argument, ColdFusion will autogenerate a web services stub, but it does not do this within a .cfm page. If you receive a json parse error using logic that is known to create a valid json object within a .cfm page, try putting the same code in a .cfc component and consume it there. It may solve this parse error for you as well. The code below has a 'proxyControllerUrl' variable that was initially using a template with a .cfm extension, and it failed. However, when I put the same function within a .cfc extension, it worked.

function getAllThemeSettingsFromIniStore(themeId){

	// Get all of the theme properties stored in the ini configuration file.
	$.ajax({
		type: "get",
		url: "<cfoutput>#application.proxyControllerUrl#?</cfoutput>method=getAllThemeSettingsFromIniStore",//Works with a .cfc component, fails when the method is inside a .cfm template.
		data: { // method and the arguments
			themeId: themeId
		},
		dataType: "json",
		cache: false,
		success: function (data){
			// Pass the data to the getAllThemeSettingsResult function. 
			getAllThemeSettingsResult(data);
		},
		error: function(xhr, textStatus, error){
			console.log(xhr.statusText);//Parse error shows up here when inside a .cfm template. 
			console.log(textStatus);
			console.log(error);
		}
	});
}//... function

This entry was posted on May 18, 2019 at 4:26 AM and has received 922 views.

Set active kendo tab


There are two standard ways to activate a Kendo tab: 1) via Javascript, or 2) appending the k-state-active class to the HTML list. Both approaches are useful. However, I have had troubles using a javascript function to set the active tab when I had a button open up a new Kendo window, and then set the active tab based upon the URL variable that I sent along when opening up the Kendo window. For some odd reason, when I used the javascript method it would not process the scripts in the second tab. I could not figure out how, or even why, this method failed, but appending the k-state-active class to set the to tab worked just fine. I will share both options below. Option 1, use javascript and the select(tabIndex) method:

// Set the active tab if it was passed into the URL.
var tabName = <cfoutput>'#URL.tabName#'</cfoutput>
// Set the active tab if the tab argument is not a null string
if (tabName !=''){
	// Set the tab
	setContractDetailTab(tabName);
}
	
// function to select the appropriate detail tab.
function setContractDetailTab(tabName){
		
	if (tabName == 'contractDetail'){
		// Get the index. We are starting at 0, so the first tab will have a zero index.
			var tabIndex = 0;
		} else if (tabName == 'routing'){
			var tabIndex = 1;
		} else if (tabName == 'attachment'){
			var tabIndex = 2;
		}
		
		// Don't perform any actions until the dom is loaded.
		$(document).ready(function() {
			// Get a reference to the tab.
			var detailTabSrip = $("#detailTabSrip").kendoTabStrip().data("kendoTabStrip");
			// Select the tab. Make sure to use a timeout otherwise an error will occur and the kendo dropdowns will not be instantiated.
			setTimeout(function() {
				detailTabSrip.select(tabIndex);
			}, 500);
			 
		});	//document.ready
	}
}

Option 2) use the k-state-active Kendo class to select the active tab:

<div id="detailTabSrip" style="height:925px">
    <!--- Tab names. --->
    <ul>
        <li id="contractDetail" <cfif not isDefined("URL.tabName") or URL.tabName eq "">class="k-state-active"</cfif>>
        	<p>Contract Detail</p>
        </li>
        <li id="routing" <cfif isDefined("URL.tabName") and URL.tabName eq 'routing'>class="k-state-active"</cfif>>
        	<p>Routing</p>
        </li>
        <li id="attachment" <cfif isDefined("URL.tabName") and URL.tabName eq 'attachment'>class="k-state-active"</cfif>
            <p>Attachment</p>
        </li>         
    </ul>
</div>

This entry was posted on May 9, 2019 at 4:55 PM and has received 1134 views.

How to get both background and non-background images using the imagesLoaded library.


I use the imagesLoaded javascript library to determine when and what images are loaded and to provide a status on a pre-loader status screen. The imagesLoaded library has the ability to gather information on background images, and non-background images using the 'background: true/false' argument. If you need to get both background and non-background images, just run it twice switching the background arguments. I highly recommend using this library when you want to provide a 'please wait' dialog and show the load progress of a graphically intense site.

// Get the parallax images (non-background images).
$('.images').imagesLoaded({
	background: false
}).progress( function( instance, image ) {
	loadProgress();
});

// Get the background images in the scenes.
$('.bcg').imagesLoaded({
	background: true
}).progress( function( instance, image ) {
	loadProgress();
});

This entry was posted on May 9, 2019 at 1:35 AM and has received 683 views.




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