I'm trying to execute several pl/sql blocks in a Dynamic Action, with feedback to the end user with a modal dialog reporting the current satus.
Something like:
Processing Step 1...
/*Run pl/sql code for step 1*/
Processing Step 2...
/*Run pl/sql code for Step 2*/
and so on...
Both, the pl/sql and javascript code, run as intended but when I combined them on a Dynamic Action in the sequence:
1 - Execute Javascript
2 - Execute PL/SQL block /* With wait for result option checked*/
3 - Execute Javascript
4 - Execute PL/SQL block
The status dialog is not been shown, however the pl/sql blocks are completed without problems.
I realize that this must be something related to javascript not been multithreaded, so I've moved the pl/sql block to application processes and run them as ajax calls like this:
function something(){
var get;
var result = 0;
updateStatus('Running Step1');
get = new htmldb_Get(null,$v('pFlowId'),'APPLICATION_PROCESS=P6_STEP_1',0);
result = get.get();
if(result > 0){
updateStatus('Running Step 2');
get = new htmldb_Get(null,$v('pFlowId'),'APPLICATION_PROCESS=P6_STEP_2',0);
result = get.get();
}
closeStatusDialog();
}
But still, as before, the processes run fine but the dialog doesn't appear. Finally I added a setTimeOut function to each call, like this:
function something(){
var get;
var result = 0;
updateStatus('Running Step1');
get = new htmldb_Get(null,$v('pFlowId'),'APPLICATION_PROCESS=P6_STEP_1',0);
result = setTimeOut(get.get(),500);
if(result > 0){
updateStatus('Running Step 2');
get = new htmldb_Get(null,$v('pFlowId'),'APPLICATION_PROCESS=P6_STEP_2',0);
result = setTimeOut(get.get(),500);
}
closeStatusDialog();
}
But still nothing. What can I do to get this running as needed?.
I've checked the browser console and no exeptions are been thrown, likewise with the pl/sql blocks.
I've solved it, although the solution doesn't rely on dynamic actions, just javascript and applicacion processes. I'm posting this for anyone with a similar problem.
The htmldb_Get Javascript object is an oracle-apex wrapper for the XMLHttpRequest AJAX object. Poorly documented though.
I've found a copy of the code (at the bottom) and it turns out it has another function called GetAsync that allows to pass a function as a parameter to asign it to the onreadystatechange attribute on the XMLHttpRequest object, which will be executed each time the attribute readyState of the underlying XMLHttpRequest changes.
The function passed as a parameter can't have parameters on its own definition.
So, instead of calling get() on the htmldb_Get object you need to call GetAsync(someFunction)
With this solution in my case:
function something(){
var get;
get = new htmldb_Get(null,$v('pFlowId'),'APPLICATION_PROCESS=P6_STEP_1',0);
get.GetAsync(someFunctionStep1);
}
function someFunctionStep1(){
if(p.readyState == 0){ /*p is the underlying XMLHttpRequest object*/
console.log("request not initialized");
updateStatus('Running Step 1');
} else if(p.readyState == 1){
console.log("server connection established");
} else if(p.readyState == 2){
console.log("request received");
} else if(p.readyState == 3){
console.log("processing request");
} else if(p.readyState == 4){
console.log("request finished and response is ready");
callStep2();
}
}
function callStep2(){
var get;
get = new htmldb_Get(null,$v('pFlowId'),'APPLICATION_PROCESS=P6_STEP_2',0);
get.GetAsync(someFunctionStep2);
}
function someFunctionStep2(){
if(p.readyState == 0){
console.log("request not initialized");
updateStatus('Running Step 2');
} else if(p.readyState == 1){
console.log("server connection established");
} else if(p.readyState == 2){
console.log("request received");
} else if(p.readyState == 3){
console.log("processing request");
} else if(p.readyState == 4){
console.log("request finished and response is ready");
closeDialog();
}
}
Here's the htmldb_get definition, at the end is the GetAsync function
/*
str should be in the form of a valid f?p= syntax
*/
function htmldb_Get(obj,flow,req,page,instance,proc,queryString) {
//
// setup variables
//
this.obj = $x(obj); // object to put in the partial page
this.proc = proc != null ? proc : 'wwv_flow.show'; // proc to call
this.flow = flow != null ? flow : $x('pFlowId').value; // flowid
this.request = req != null ? req : ''; // request
this.page = page; // page
this.params = ''; // holder for params
this.response = ''; // holder for the response
this.base = null; // holder fot the base url
this.queryString = queryString!= null ? queryString : null ; // holder for passing in f? syntax
this.syncMode = false;
//
// declare methods
//
this.addParam = htmldb_Get_addParam;
this.add = htmldb_Get_addItem;
this.getPartial = htmldb_Get_trimPartialPage;
this.getFull = htmldb_Get_fullReturn;
this.get = htmldb_Get_getData;
this.url = htmldb_Get_getUrl;
this.escape = htmldb_Get_escape;
this.clear = htmldb_Get_clear;
this.sync = htmldb_Get_sync;
this.setNode = setNode;
this.replaceNode = replaceNode
//
// setup the base url
//
var u = window.location.href.indexOf("?") > 0 ?
window.location.href.substring(0,window.location.href.indexOf("?"))
: window.location.href;
this.base = u.substring(0,u.lastIndexOf("/"));
if ( this.proc == null || this.proc == "" )
this.proc = u.substring(u.lastIndexOf("/")+1);
this.base = this.base +"/" + this.proc;
//
// grab the instance form the page form
//
if ( instance == null || instance == "" ) {
var pageInstance = document.getElementById("pInstance");
if ( typeof(pageInstance) == 'object' ) {
this.instance = pageInstance.value;
}
} else {
this.instance = instance;
}
//
// finish setiing up the base url and params
//
if ( ! queryString ) {
this.addParam('p_request', this.request) ;
this.addParam('p_instance', this.instance);
this.addParam('p_flow_id', this.flow);
this.addParam('p_flow_step_id',this.page);
}
function setNode(id) {
this.node = html_GetElement(id);
}
function replaceNode(newNode){
var i=0;
for(i=this.node.childNodes.length-1;i>=0;i--){
this.node.removeChild(this.node.childNodes[i]);
}
this.node.appendChild(newNode);
}
}
function htmldb_Get_sync(s){
this.syncMode=s;
}
function htmldb_Get_clear(val){
this.addParam('p_clear_cache',val);
}
//
// return the queryString
//
function htmldb_Get_getUrl(){
return this.queryString == null ? this.base +'?'+ this.params : this.queryString;
}
function htmldb_Get_escape(val){
// force to be a string
val = val + "";
val = val.replace(/\%/g, "%25");
val = val.replace(/\+/g, "%2B");
val = val.replace(/\ /g, "%20");
val = val.replace(/\./g, "%2E");
val = val.replace(/\*/g, "%2A");
val = val.replace(/\?/g, "%3F");
val = val.replace(/\\/g, "%5C");
val = val.replace(/\//g, "%2F");
val = val.replace(/\>/g, "%3E");
val = val.replace(/\</g, "%3C");
val = val.replace(/\{/g, "%7B");
val = val.replace(/\}/g, "%7D");
val = val.replace(/\~/g, "%7E");
val = val.replace(/\[/g, "%5B");
val = val.replace(/\]/g, "%5D");
val = val.replace(/\`/g, "%60");
val = val.replace(/\;/g, "%3B");
val = val.replace(/\?/g, "%3F");
val = val.replace(/\#/g, "%40");
val = val.replace(/\&/g, "%26");
val = val.replace(/\#/g, "%23");
val = val.replace(/\|/g, "%7C");
val = val.replace(/\^/g, "%5E");
val = val.replace(/\:/g, "%3A");
val = val.replace(/\=/g, "%3D");
val = val.replace(/\$/g, "%24");
//val = val.replace(/\"/g, "%22");
return val;
}
//
// Simple function to add name/value pairs to the url
//
function htmldb_Get_addParam(name,val){
if ( this.params == '' )
this.params = name + '='+ ( val != null ? this.escape(val) : '' );
else
//this.params = this.params + '&'+ name + '='+ ( val != null ? val : '' );
this.params = this.params + '&'+ name + '='+ ( val != null ? this.escape(val) : '' );
return;
}
//
// Simple function to add name/value pairs to the url
//
function htmldb_Get_addItem(name,value){
this.addParam('p_arg_names',name);
this.addParam('p_arg_values',value);
}
//
// funtion strips out the PPR sections and returns that
//
function htmldb_Get_trimPartialPage(startTag,endTag,obj) {
setTimeout(html_processing,1);
if (obj) {this.obj = $x(obj);}
if (!startTag){startTag = '<!--START-->'};
if (!endTag){endTag = '<!--END-->'};
var start = this.response.indexOf(startTag);
var part;
if ( start >0 ) {
this.response = this.response.substring(start+startTag.length);
var end = this.response.indexOf(endTag);
this.response = this.response.substring(0,end);
}
if ( this.obj ) {
if(this.obj.nodeName == 'INPUT'){
if(document.all){
gResult = this.response;
gNode = this.obj;
var ie_HACK = 'htmldb_get_WriteResult()';
setTimeout(ie_HACK,100);
}else{
this.obj.value = this.response;
}
}else{
if(document.all){
gResult = this.response;
gNode = this.obj;
var ie_HACK = 'htmldb_get_WriteResult()';
setTimeout(ie_HACK,100);
}else{
this.obj.innerHTML = this.response;
}
}
}
//window.status = 'Done'
setTimeout(html_Doneprocessing,1);
return this.response;
}
var gResult = null;
var gNode = null
function htmldb_get_WriteResult(){
if(gNode && ( gNode.nodeName == 'INPUT' || gNode.nodeName == 'TEXTAREA')){
gNode.value = gResult;
}else{
gNode.innerHTML = gResult;
}
gResult = null;
gNode = null;
return;
}
//
// function return the full response
//
function htmldb_Get_fullReturn(obj) {
setTimeout(html_processing,1);
if (obj) { this.obj = html_GetElement(obj);}
if ( this.obj ) {
if(this.obj.nodeName == 'INPUT'){
this.obj.value = this.response;
}else{
if(document.all){
gResult = this.response;
gNode = this.obj;
var ie_HACK = 'htmldb_get_WriteResult()';
setTimeout(ie_HACK,10);
}else{
this.obj.innerHTML = this.response;
}
}
}
setTimeout(html_Doneprocessing,1);
return this.response;
}
//
// Perform the actual get from the server
//
function htmldb_Get_getData(mode,startTag,endTag){
html_processing();
var p;
try {
p = new XMLHttpRequest();
} catch (e) {
p = new ActiveXObject("Msxml2.XMLHTTP");
}
try {
var startTime = new Date();
p.open("POST", this.base, this.syncMode);
p.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
p.send(this.queryString == null ? this.params : this.queryString );
this.response = p.responseText;
if ( this.node )
this.replaceNode(p.responseXML);
if ( mode == null || mode =='PPR' ) {
return this.getPartial(startTag,endTag);
} if ( mode == "XML" ) {
setTimeout(html_Doneprocessing,1);
return p.responseXML;
} else {
return this.getFull();
}
} catch (e) {
setTimeout(html_Doneprocessing,1);
return;
}
}
function html_Doneprocessing(){
document.body.style.cursor="default";
}
function html_processing(){
document.body.style.cursor="wait";
}
/*
this adds better aysnc functionality
to the htmldb_Get object
pVar is the function that you want to call when the xmlhttp state changes
in the function specified by pVar the xmlhttp object can be referenced by the variable p
*/
htmldb_Get.prototype.GetAsync = function(pVar){
try{
p = new XMLHttpRequest();
}catch(e){
p = new ActiveXObject("Msxml2.XMLHTTP");
}
try {
var startTime = new Date();
p.open("POST", this.base, true);
if(p) {
p.onreadystatechange = pVar;
p.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
p.send(this.queryString == null ? this.params : this.queryString );
return p;
}
}catch(e){
return false;
}
}
/* PDF OUTPUT */
/*Gets PDF src XML */
function htmldb_ExternalPost(pThis,pRegion,pPostUrl){
var pURL = 'f?p='+html_GetElement('pFlowId').value+':'+html_GetElement('pFlowStepId').value+':'+html_GetElement('pInstance').value+':FLOW_FOP_OUTPUT_R'+pRegion
document.body.innerHTML = document.body.innerHTML + '<div style="display:none;" id="dbaseSecondForm"><form id="xmlFormPost" action="' + pPostUrl + '?ie=.pdf" method="post" target="pdf"><textarea name="vXML" id="vXML" style="width:500px;height:500px;"></textarea></form></div>';
var l_El = html_GetElement('vXML');
var get = new htmldb_Get(l_El,null,null,null,null,'f',pURL.substring(2));
get.get();
get = null;
setTimeout('html_GetElement("xmlFormPost").submit()',10);
return;
}
function $xml_Control(pThis){
this.xsl_string = '<?xml version="1.0"?><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"><xsl:output method="html"/><xsl:param name="xpath" /><xsl:template match="/"><xsl:copy-of select="//*[#id=$xpath]"/></xsl:template></xsl:stylesheet>';
if(document.all){
this.xsl_object = new ActiveXObject("Msxml2.FreeThreadedDOMDocument.3.0");
this.xsl_object.async=false;
this.xsl_object.loadXML(this.xsl_string)
tmp = new ActiveXObject("Msxml2.XSLTemplate.3.0");
tmp.stylesheet = this.xsl_object;
this.xsl_processor = tmp.createProcessor();
}else{
this.xsl_object = (new DOMParser()).parseFromString(this.xsl_string, "text/xml");
this.xsl_processor = (new XSLTProcessor());
this.xsl_processor.importStylesheet(this.xsl_object);
this.ownerDocument = document.implementation.createDocument("", "test", null);
}
this.xml = pThis;
this.CloneAndPlace = _CloneAndPlace;
return
function _CloneAndPlace(pThis,pThat,pText){
var lThat = $x(pThat);
if(document.all){
this.xsl_processor.addParameter("xpath", pThis);
this.xsl_processor.input = this.xml;
this.xsl_processor.transform;
var newFragment = this.xsl_processor.output;
}else{
this.xsl_processor.setParameter(null, "xpath", pThis);
var newFragment = this.xsl_processor.transformToFragment(this.xml,this.ownerDocument);
}
if(lThat){
if(document.all){
lThat.innerHTML='';
lThat.innerHTML=newFragment;
}else{
lThat.innerHTML='';
lThat.appendChild(newFragment);
}
/*
in IE newFragment will be a string
in FF newFragment will be a dome Node (more useful)
*/
return newFragment;
}
}
}
I have a piece of JavaScript code that is working fine in IE but in chrome onreadystatechange event does not fire.
var oXml = document.createElement("XML");
document.body.appendChild(oXml);
oS = new Object();
oS.sXmlHttp = null;
oS.aXmlHttp = null;
oS.fPending = true;
oS.nextCall = null;
oS.lastCall = null;
oS.url = url;
oS._oXml = oXml;
oS.ns = new Array();
oS.nsalias = new Array();
if (options != null) {
oS.fSeq = options.reuseConnection;
oS.SOAPHeader = options.SOAPHeader;
}
if (oS.fSeq == null)
oS.fSeq = false;
_sdl[url] = oS;
oXml.service = userName;
oXml.onreadystatechange = getWsdl //event funtion not fires in chrome;
oXml.src = url;
In above code onreadystatechange not fires in chrome.
Any help please?
The problem is not that chrome not fires the event. It is just that the event does not exist.
var oXml = document.createElement("XML");
console.log( typeof oXml.onreadystatechange ); // this prints "undefined"
I am using this code to preload image and reference them later by id.
It's working in most browsers and on ipad, but IE8 generates this error:
'Unable to get property 'target' of undefined null reference'
This is my code:
var images = [{id:"kids", url:"assets/driekids.png"}, {id:"title",url:"assets/gametitle.png"}];
var assets = [];
var fnCallback = fn;
var loaded = 0;
this.startLoading = function() {
var t = this;
for(var i = 0;i<images.length;i++){
var r = new Image();
r.src = images[i].url;
r.name = images[i].id;
r.onload = function(){t.checkLoaded();};
}
}
this.checkLoaded = function(e) {
this.assets[e.target.name] = e.target;
loaded++;
if(loaded == images.length) fnCallback();
}
My question: is this way of image preloading, by using new Image(), possible on IE8?
In IE you get the event object like this:
window.event
so you will have to make modifications to your code:
this.startLoading = function() {
var t = this;
for(var i = 0;i<images.length;i++){
var r = new Image();
r.src = images[i].url;
r.name = images[i].id;
r.onload = t.checkLoaded; // you dont want an anonymous function here
}
}
this.checkLoaded = function(e) {
// get the event object for both IE and other browsers
var event = e || window.event;
var target = e.target || event.srcElement ;
this.assets[target.name] = target;
loaded++;
if(loaded == images.length) fnCallback();
}
This app https://developer.mozilla.org/en-US/demos/detail/meet-me-there/launch accepts uploaded photos, attaches a qr code to them, and then allows you to share them. I've attached below the JavaScript for everything except the QR functionality. The app doesn't use jQuery, but at the beginning it assigns a function to the $.
window.onload = function(){
var $ = function(id){
console.log(id);
return document.getElementById(id);
},
When I run the app with the console.log in the above position, it shows that quite a few 'ids' are getting passed through that console.log(id). As the file loads, it logs 'surface', 'cam' and 'upload' and, as you engage the app, it logs 'result', 'sharer', 'uploadedURL' and many others. Problem is that I don't see how everything keeps getting passed through that function for the console.log to log the different 'id's at that point in the code. Therefore, I wonder what the significance of '$' is in this context (no jQuery). Specifically, by creating that '$' function, is it called anytime that any of the other events with $ are run, such as $('upload').onclick = function(){...
Is it working similar to how adding a prototype is working in jquery by using $.prototype.function() in jquery. If so, where does it get this functionality from if there's no jQuery.
window.onload = function(){
var $ = function(id){
console.log(id);
return document.getElementById(id);
},
canvas = $('surface'),
ctx = canvas.getContext('2d'),
watcher, loc='No location provided', located;
$('cam').onchange = function(event){
console.log(event);
console.trace();
var files = event.target.files,
file;
if (files && files.length > 0) {
file = files[0];
try {
var URL = window.URL || window.webkitURL || window.mozURL;
var imgURL = URL.createObjectURL(file);
var img = new Image();
img.id = "tester";
//Load it onto the canvas
img.onload = function() {
console.trace();
canvas.width = this.width;
canvas.height = this.height;
$('info').innerHTML = ("Width: " + this.width + "px, Height: " + this.height + "px");
$('result').width = 400;
$('result').height = (400 / (this.width/this.height)) >> 0;
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
var codeSize = (canvas.height/4) >> 0;
var imgn = new Image();
imgn.onload = function(){
ctx.drawImage(imgn, (canvas.width-5- codeSize), (canvas.height-5-codeSize), codeSize, codeSize);
$('result').src = canvas.toDataURL();
}
imgn.src = (QR.encode(loc, codeSize, 5));
}
img.src = imgURL;
} catch (e) {
console.log("error: " + e);
}
}
},
// borrowed this functionality from cgack's demo
// https://developer.mozilla.org/en-US/demos/detail/snap-and-share
$('upload').onclick = function(){
$('infomsg').style.display = 'block';
var url = "http://api.imgur.com/2/upload.json",
params = new FormData(),
http = new XMLHttpRequest();
params.append('key','29a8b1db1d8fda0df87006def2307242');
params.append('image',canvas.toDataURL().split(',')[1]);
http.open("POST", url);
http.onload = function() {
var url = JSON.parse(http.responseText).upload.links.imgur_page;
$('uploadedUrl').href = url;
$('uploadedUrl').innerHTML = url;
$('shareFb').href = ("http://www.facebook.com/sharer.php?u="+url);
$('shareTwitter').href = ("http://twitter.com/intent/tweet?url="+url);
$('sharer').style.display = 'block';
$('infomsg').style.display = 'none';
};
http.send(params);
console.log(params);
};
watcher = navigator.geolocation.watchPosition(function(position){
console.trace();
console.log("navigator");
loc = "geo:" + position.coords.latitude + "," +position.coords.longitude;
located = true;
}, function(error){
if(error.code == error.PERMISSION_DENIED || error.code == error.POSITION_UNAVAILABLE)
alert('damn, we were not able to locate you. sorry.');
}
);
};
$ is just a variable name, like any other. It has no special meaning.
"Problem is that I don't see how everything keeps getting passed through that function for the console.log to log the 'id' at that point in the code."
Any time you see $, it's a reference to the function. So a () after it invokes it with the given argument. It's just like any other function, just with a funny name referencing it.
"Therefore, I wonder what the significance of '$' is in this context (no jQuery). Specifically, by creating that '$' function, is it called anytime that any of the other events with $ are run"
Again, no real significance. It's just a function name. If you renamed all the instances of $ to byId, it would behave the same.
window.onload = function(){
// var $ = function(id){
var byId = function(id){
console.log(id);
return document.getElementById(id);
},
canvas = foo('surface'),
ctx = canvas.getContext('2d'),
watcher, loc='No location provided', located;
byId('cam').onchange = function(event){
/* a bunch of code */
},
byId('upload').onclick = function(){
/* a bunch of code */
};
// rest of the code
};
I'm trying to configure CKEditor so that it could embed YouTube videos directly... I saw there's a proposed patch but I want to keep the original CKEditor distribution as it is, so I was wondering if it's possible to "monkey patch" CKEditor at runtime so that if the user types a YouTube URL inside the Flash dialog, the URL gets transformed to allow embedding.
I've tried this:
CKEDITOR.on('dialogDefinition', function(ev){
if (dialogName == 'flash'){
var infotab = dialogDefinition.getContents('info');
var f = dialogDefinition.onOk;
dialogDefinition.onOk = function(ev) {
var cur = this.getContentElement('info', 'src').getValue();
var newurl = cur.replace('youtube.com/watch?v=', 'youtube.com/v/');
if (cur != newurl) {
this.getContentElement('info', 'src').setValue(newurl);
};
f(ev);
}
}
}
but it won't work, since inside f the code uses this, and my "patch" changes it...
If you attach the onOK to another property of dialogDefinition, this will be correct within it (I think).
CKEDITOR.on('dialogDefinition', function(ev){
if (dialogName == 'flash'){
var infotab = dialogDefinition.getContents('info');
dialogDefinition.oldOnOk = dialogDefinition.onOk; //change here
dialogDefinition.onOk = function(ev) {
var cur = this.getContentElement('info', 'src').getValue();
var newurl = cur.replace('youtube.com/watch?v=', 'youtube.com/v/');
if (cur != newurl) {
this.getContentElement('info', 'src').setValue(newurl);
};
dialogDefinition.oldOnOk(ev); //and change here
}
}
}
Or use Function.apply:
CKEDITOR.on('dialogDefinition', function(ev){
if (dialogName == 'flash'){
var infotab = dialogDefinition.getContents('info');
var f = dialogDefinition.onOk;
dialogDefinition.onOk = function(ev) {
var cur = this.getContentElement('info', 'src').getValue();
var newurl = cur.replace('youtube.com/watch?v=', 'youtube.com/v/');
if (cur != newurl) {
this.getContentElement('info', 'src').setValue(newurl);
};
f.apply(this, ev); //change here
}
}
}