Print from iOS devices to AirPrint compatible printers

plugin.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<plugin xmlns="http://www.phonegap.com/ns/plugins/1.0"
+        id="de.appplant.maintcall.cordova.plugin.printer"
+        version="0.0.1">
+
+    <name>Printer</name>
+
+    <engines>
+        <engine name="cordova" version=">=3.0.0" />
+    </engines>
+
+    <!-- ios -->
+    <platform name="ios">
+
+        <config-file target="config.xml" parent="/*">
+		<feature name="Printer">
+			<param name="ios-package" value="CDVPlugin"/>
+		</feature>
+        </config-file>
+
+        <js-module src="www/printer.js" name="printer">
+            <clobbers target="plugin.printer" />
+        </js-module>
+
+	<header-file src="src/ios/CDVPrinter.h" />
+	<source-file src="src/ios/CDVPrinter.m" />
+
+    </platform>
+
+</plugin>

src/ios/CDVPrinter.h

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+//
+//  PrintPlugin.h
+//  Print Plugin
+//
+//  Created by Ian Tipton (github.com/itip) on 02/07/2011.
+//  Copyright 2011 Ian Tipton. All rights reserved.
+//  MIT licensed
+//
+
+#import <Foundation/Foundation.h>
+#import <Cordova/CDVPlugin.h>
+
+
+@interface CDVPrinter : CDVPlugin {
+    NSString* successCallback;
+    NSString* failCallback;
+    NSString* printHTML;
+    
+    //Options
+    NSInteger dialogLeftPos;
+    NSInteger dialogTopPos;
+}
+
+@property (nonatomic, copy) NSString* successCallback;
+@property (nonatomic, copy) NSString* failCallback;
+@property (nonatomic, copy) NSString* printHTML;
+
+//Print Settings
+@property NSInteger dialogLeftPos;
+@property NSInteger dialogTopPos;
+
+//Print HTML
+- (void) print:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options;
+
+//Find out whether printing is supported on this platform.
+- (void) isPrintingAvailable:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options;
+
+@end

src/ios/CDVPrinter.m

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+//
+//  PrintPlugin.m
+//  Print Plugin
+//
+//  Created by Ian Tipton (github.com/itip) on 02/07/2011.
+//  Copyright 2011 Ian Tipton. All rights reserved.
+//  MIT licensed
+//
+
+#import "CDVPrinter.h"
+
+@interface CDVPrinter (Private)
+-(void) doPrint;
+-(void) callbackWithFuntion:(NSString *)function withData:(NSString *)value;
+- (BOOL) isPrintServiceAvailable;
+@end
+
+@implementation CDVPrinter
+
+@synthesize successCallback, failCallback, printHTML, dialogTopPos, dialogLeftPos;
+
+/*
+ Is printing available. Callback returns true/false if printing is available/unavailable.
+ */
+- (void) isPrintingAvailable:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options{
+    NSUInteger argc = [arguments count];
+	
+	if (argc < 1) {
+		return;	
+	}
+    
+    
+    NSString *callBackFunction = [arguments objectAtIndex:0];
+    [self callbackWithFuntion:callBackFunction withData:
+            [NSString stringWithFormat:@"{available: %@}", ([self isPrintServiceAvailable] ? @"true" : @"false")]];
+    
+}
+
+- (void) print:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options{
+    NSUInteger argc = [arguments count];
+	
+	if (argc < 1) {
+		return;	
+	}
+    self.printHTML = [arguments objectAtIndex:0];
+    
+    if (argc >= 2){
+        self.successCallback = [arguments objectAtIndex:1];
+    }
+    
+    if (argc >= 3){
+        self.failCallback = [arguments objectAtIndex:2];
+    }
+    
+    if (argc >= 4){
+        self.dialogLeftPos = [[arguments objectAtIndex:3] intValue];
+    }
+    
+    if (argc >= 5){
+        self.dialogTopPos = [[arguments objectAtIndex:4] intValue];
+    }
+    
+    
+    
+    
+    [self doPrint];
+
+}
+
+- (void) doPrint{
+    if (![self isPrintServiceAvailable]){
+        [self callbackWithFuntion:self.failCallback withData: @"{success: false, available: false}"];
+        
+        return;
+    }
+    
+    UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];
+    
+    if (!controller){
+        return;
+    }
+    
+	if ([UIPrintInteractionController isPrintingAvailable]){        
+		//Set the priner settings
+        UIPrintInfo *printInfo = [UIPrintInfo printInfo];
+        printInfo.outputType = UIPrintInfoOutputGeneral;
+        controller.printInfo = printInfo;
+        controller.showsPageRange = YES;
+        
+        
+        //Set the base URL to be the www directory.
+        NSString *dbFilePath = [[NSBundle mainBundle] pathForResource:@"www" ofType:nil ];
+        NSURL *baseURL = [NSURL fileURLWithPath:dbFilePath];
+                
+        //Load page into a webview and use its formatter to print the page 
+		UIWebView *webViewPrint = [[UIWebView alloc] init];
+		[webViewPrint loadHTMLString:printHTML baseURL:baseURL];
+        
+        //Get formatter for web (note: margin not required - done in web page)
+		UIViewPrintFormatter *viewFormatter = [webViewPrint viewPrintFormatter];
+        controller.printFormatter = viewFormatter;
+        controller.showsPageRange = YES;
+        
+        
+		void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) =
+		^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
+            if (!completed || error) {
+                [self callbackWithFuntion:self.failCallback withData:
+                    [NSString stringWithFormat:@"{success: false, available: true, error: \"%@\"}", error.localizedDescription]];
+                
+			}
+            else{
+                [self callbackWithFuntion:self.successCallback withData: @"{success: true, available: true}"];
+            }
+        };
+        
+        /*
+         If iPad, and if button offsets passed, then show dilalog originating from offset
+         */
+        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad &&
+            dialogTopPos != 0 && dialogLeftPos != 0) {
+            [controller presentFromRect:CGRectMake(self.dialogLeftPos, self.dialogTopPos, 0, 0) inView:self.webView animated:YES completionHandler:completionHandler];
+        } else {
+            [controller presentAnimated:YES completionHandler:completionHandler];
+        }
+    }
+}
+
+-(BOOL) isPrintServiceAvailable{
+  
+    Class myClass = NSClassFromString(@"UIPrintInteractionController");
+    if (myClass) {
+        UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];
+        return (controller != nil) && [UIPrintInteractionController isPrintingAvailable];
+    }
+  
+    
+    return NO;
+}
+
+#pragma mark -
+#pragma mark Return messages
+                 
+-(void) callbackWithFuntion:(NSString *)function withData:(NSString *)value{
+    if (!function || [@"" isEqualToString:function]){
+        return;
+    }
+    
+    NSString* jsCallBack = [NSString stringWithFormat:@"%@(%@);", function, value];
+    [self writeJavascript: jsCallBack];
+}
+
+@end

www/printer.js

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+
+/**
+ * Printer Plugin
+ * Copyright (c) 2011 Ian Tipton (github.com/itip)
+ * MIT licensed
+ */
+
+var PrintPlugin = function() {
+
+}
+
+PrintPlugin.prototype.callbackMap = {};
+PrintPlugin.prototype.callbackIdx = 0;
+
+/*
+ print      - html string or DOM node (if latter, innerHTML is used to get the contents). REQUIRED.
+ success    - callback function called if print successful.     {success: true}
+ fail       - callback function called if print unsuccessful.  If print fails, {error: reason}. If printing not available: {available: false}
+ options    -  {dialogOffset:{left: 0, right: 0}}. Position of popup dialog (iPad only).
+ */
+PrintPlugin.prototype.print = function(printHTML, success, fail, options) {
+    if (typeof printHTML != 'string'){
+        console.log("Print function requires an HTML string. Not an object");
+        return;
+    }
+
+
+    //var printHTML = "";
+
+    var dialogLeftPos = 0;
+    var dialogTopPos = 0;
+
+
+    if (options){
+        if (options.dialogOffset){
+            if (options.dialogOffset.left){
+                dialogLeftPos = options.dialogOffset.left;
+                if (isNaN(dialogLeftPos)){
+                    dialogLeftPos = 0;
+                }
+            }
+            if (options.dialogOffset.top){
+                dialogTopPos = options.dialogOffset.top;
+                if (isNaN(dialogTopPos)){
+                    dialogTopPos = 0;
+                }
+            }
+        }
+    }
+
+    var key = 'print' + this.callbackIdx++;
+    window.plugins.printPlugin.callbackMap[key] = {
+        success: function(result) {
+            delete window.plugins.printPlugin.callbackMap[key];
+            success(result);
+        },
+        fail: function(result) {
+            delete window.plugins.printPlugin.callbackMap[key];
+            fail(result);
+        }
+    };
+
+    var callbackPrefix = 'window.plugins.printPlugin.callbackMap.' + key;
+    return cordova.exec("PrintPlugin.print", printHTML, callbackPrefix + '.success', callbackPrefix + '.fail', dialogLeftPos, dialogTopPos);
+};
+
+/*
+ * Callback function returns {available: true/false}
+ */
+PrintPlugin.prototype.isPrintingAvailable = function(callback) {
+    var key = 'isPrintingAvailable' + this.callbackIdx++;
+    window.plugins.printPlugin.callbackMap[key] = function(result) {
+        delete window.plugins.printPlugin.callbackMap[key];
+        callback(result);
+    };
+
+    var callbackName = 'window.plugins.printPlugin.callbackMap.' + key;
+    cordova.exec("PrintPlugin.isPrintingAvailable", callbackName);
+};
+
+cordova.addConstructor(function() {
+    if(!window.plugins){
+        window.plugins = {};
+    }
+    window.plugins.printPlugin = new PrintPlugin();
+});