Develop Reference

Query selector to select Button A only if site does not have Button B

I'm creating a Chrome Browser Extension that clicks some buttons automatically whenever they appear. I'm using arrive.js for the watching, which uses a query Selector to watch for the html elements to click on.
var buttonA = 'a[data-test="begin-session-button"]'
var buttonB = 'a[data-test="skill-header-practice-button"]'
document.arrive(buttonA, function () {
document.querySelector(buttonA).click();
});
document.arrive(buttonB, function () {
document.querySelector(buttonB).click();
});
The Problem I have is some sites have both buttons buttonA and buttonB. As of now both buttons would be clicked and it is a matter of luck which one gets clicked last.
Whenever there is a site with buttonA and buttonB, only click buttonA. So I'm looking to alter the query for buttonB like:
document.arrive(buttonB + ' :not:' + buttonA, function () {
document.querySelector(buttonB).click();
});
As a query in the Chrome Browser Console this would look like:
document.querySelector(
'a[data-test="skill-header-practice-button] ' +
':not:a[data-test="begin-session-button"]'
)
This is bad syntax and not working in the chrome brower console. How would the Correct Syntax look like?

Could you not do something like this
document.arrive(buttonA, function () {
document.querySelector(buttonA).click();
});
document.arrive(buttonB, function () {
if(document.querySelector(buttonA) == null){
document.querySelector(buttonB).click();
}
});
I can't say that I have used the arrive library before though so I could be completely wrong

i guess this is simpler to do it "programatically" than with complex selectors, something like (works with your code because buttonA is global, be careful that this var must be accessible to the function):
var buttonA = 'a[data-test="begin-session-button"]'
var buttonB = 'a[data-test="skill-header-practice-button"]'
document.arrive(buttonA, function () {
document.querySelector(buttonA).click();
});
document.arrive(buttonB, function () {
var buttA = document.querySelector(buttonA);
if(buttA === null){
document.querySelector(buttonB).click();
}
});

HTML href onclick will not trigger javascript function

I have been asked to update my question so here goes:
I have records in a database, some of which have wave file names attached. I am looping through the database and wanting to write out the word "Play" in a column under a header named Audio File. When "Play" is clicked on, the audio player plays the file and turns the href word to "Pause". When my code loops through these records, it is assigning a separate ID to each href. For me to call the function that starts the audio player, I need to send an audioControl ID (aControl) variable as well as the src source file (thissource) variable for the audio player - hence the & and " in the function call. When I use the onclick event in a button, it triggers the function. However, when I click the href link (which is what I want instead of a button) nothing happens. I am not sure which part of the code is messy, as I found the function code on the internet. Thank-you in advance for any and all help.
No matter what I do, my href onclick will not trigger a javascript function. I have taken the return false out of the function and put it in the href but that doesn't work either. I have put the same onclick code in a button and it triggers great.
HTML:
<a href='#' onclick='passvariables(" & aControl & "," & thissource & ");'>Play</a>
Javascript:
function passvariables(aControl, thissource)
{
var yourAudio= new Audio();
yourAudio.src = thissource;
yourAudio.type = 'audio/wav';
ctrl = document.getElementById(aControl);
ctrl.onclick = function ()
{
// Update the Button
var pause = ctrl.innerHTML === 'Pause';
ctrl.innerHTML = pause ? 'Play' : 'Pause';
// Update the Audio
var method = pause ? 'pause' : 'play';
yourAudio[method]();
// Prevent Default Action
return false;
}
}

Just have onclick call passvariables without the return and have passvariables return false.

You can try:
window.passvariables = function(aControl, thissource) {
// Your code
};
My guess if that your function is defined within another function (executed onload for instance). Hence "passvariables" is not defined in the "window" scope.

I saw you updated your questions that's good :)
First I recommend you to use the javascript library jquery which is easier to manipulate the DOM and you can easily find ressources and help on this site.
Here's what your code should look. I haven't tested it but it's a good overview of what this should be.
Put this in the <head> section of your HTML code
<script src="http://code.jquery.com/jquery-1.12.0.min.js"></script>
<script>
$(document).ready(function() {
//Assigning onClick function for every HTML tags having the css class "Play"
$('.Play').click(function(){
if($(this).html() == "Play"){
//retrieving information about the audio
var waveFile = $(this).attr("data-waveFile");
var audioId = $(this).attr("data-audioId");
//calling the startAudio function and assign the Audio object to myAudioObject
var myAudioObject = startAudio(waveFile, audioId);
if(myAudioObject){
//Audio started playing
$(this).html("Pause");
}else{
alert("error while starting to play file");
}
}else{
var isPaused = pauseAudio(myAudioObject);
if(isPaused){
//The pauseAudio function returned true so the audio is paused
$(this).html("Play");
}else{
alert("error while pausing");
}
}
});
//Functions to manage audio Player
function startAudio(waveFile, audioId){
audioObject = document.getElementById("audio");
audioObject.src = waveFile;
audioObject.play();
return true;
}
function pauseAudio(){
//do whatever to pause
audioObject = document.getElementById("audio");
audioObject.pause();
return true;
}
});
</script>
in the <body> section of your HTML code where you construct the table using database datas :
<table>
<tr>
<td>Song name</td>
<td>Action</td>
</tr>
<tr>
<td><%=WaveFile%></td>
<td>Play</td>
</tr>
</table>
<audio id="audio"></audio>
Note the <%=WaveFile%> and <%=AudioId%> should be the values you get from the database in your loop

Thank-you everyone for your help! I finally got it working! Here is the code:
yAudio = "'yourAudio" & thisline & "'"
aControl = "'audioControl" & thisline & "'"
thissource = "'/WaveFiles/" & RS.Fields("AudioIssues") &"'"
R"<td width=12 class=allprint>Play</td>"
// Call and play audio via JavaScript
$(document).ready(function()
{
var aElement = document.createElement('audio');
$('.Play').click(function()
{
if($(this).html() == "Play")
{
var waveFile = $(this).attr("data-waveFile");
var audioID = $(this).attr("data-audioId");
aElement.setAttribute('src', waveFile);
aElement.load()
aElement.addEventListener("load", function()
{
aElement.play();
$(this).html("Stop");
$(".duration span").html(aElement.duration);
$(".filename span").html(aElement.src);
}, true);
aElement.play();
$(this).html("Stop");
}
else
{
var waveFile = $(this).attr("data-waveFile");
var audioID = $(this).attr("data-audioId");
aElement.setAttribute('src', waveFile);
aElement.pause();
$(this).html("Play");
}
});
});

Detecting a form.submit() performed via JavaScript

In my page there is a frame that belongs to the same domain. The content of this frame is varied and relatively unpredictable. Whenever a user clicks a button (inside the frame) that performs a post, I need to execute a function that performs some UI tasks. The problem is that I cannot edit the source of these frames for reasons beyond my control. Some of these buttons are simple form submit buttons, but others do not directly submit the form, but instead have an onclick handler that performs some checks and might submit.
Here is the problem: How do I detect if one of these onclick handlers called form.submit()? If there's no handler, then obviously I can set up a handler for onsubmit(), but is not the case for all of these buttons.
This is my code so far:
function addEventBefore(element, type, before, after) {
var old = element['on' + type] || function() {};
before = before || function() {};
after = after || function() {};
element['on' + type] = function () {
before();
old();//I can't modify this old onclick handler
after();
};
}
function setup() {
console.log('setup');
}
function takedown() {
// In this method, I want to know if old() caused a form submit
console.log('takedown');
}
function $includeFrames(jQuery, selector) {
return jQuery(selector).add(jQuery('iframe').contents().find(selector));
}
var a = $includeFrames($, 'input[type="submit"], input[type="button"]').each(function() {
var elem = $(this)[0];
addEventBefore(elem, 'click', setup, takedown);
});

In the onload event of the iframe you'll need to hook up an event listener to each form in the iframed page. You need to do this on every load, as each fresh page needs new listeners.
$("#someIframe").on('load',function() {
$(this).contents().find("form").each(function() {
$(this).on('submit',function() {... your code...})
})
}

The solution that worked for me came from a friend of mine. The solution is to shim the form.submit() function.
$(function() {
var el = document.getElementById('myform');
el.submit = function(fn) {
return function() {
myFunctionGoesHere();
fn.apply(this, arguments);
};
}(el.submit);
});
Here is a working example: http://jsfiddle.net/hW6Z4/9/

Getting a form to submit from JavaScript?

I have a form in a JSP as follows:
<form action = "<c:url value = '/displayVisualisation' />"
title = "${item.visDescription}"
method = "post" onClick = "return confirmRequest('Do you want to change to
another visualisation type?');">
<input class = "text" type = "text" value = "${item.visTypeName}">
</form>
Which calls a Javascript method as follows:
function confirmRequest(questionText) {
var confirmRequest = confirm(questionText);
if (confirmRequest) {
return true;
}
else {
return false;
}
}
To ask the user for a reply to the question asked. However, the confirm prompt appears but does not perform the displayVisualisation action!
Can anyone suggest why or help me implement this correctly?
In other examples, where the action is triggered by clicking a graphic, all is well.

Since you are using onclick, return true; in your confirmRequest function is simply allowing the rest of the clickHandler chain to be executed. I think you also need to explicitly submit the form at this time, in the true case.
Here is one way to do that, using only javascript:
function confirmRequest(questionText) {
var confirmRequest = confirm(questionText);
if (confirmRequest) {
document.forms[0].submit();
return true;
}
else {
return false;
}
}

TinyMCE - Adding a Key Binding CNRTL-S COMMAND-S to call an AJAX save Function

I'd like to learn how to bind a CNRTL-S or COMMAND-S to call a function that I have on my page which AJAX saves the textarea content's
How can I bind those two commands? I used to use the following when it was just a textarea, but since adding TinyMCE it no longer works. Suggestions?
// Keybind the Control-Save
jQuery('#text_area_content').bind('keydown', 'ctrl+s',function (evt){
saveTextArea();
return false;
});
// Keybind the Meta-Save Mac
jQuery('#text_area_content').bind('keydown', 'meta+s',function (evt){
saveTextArea();
return false;
});
Thanks

To use a custom method for saving, i declare my saving function in the tinymce.init method
tinyMCE.init({
// General options
mode: "none",
/* some standard init params, plugins, ui, custom styles, etc */
save_onsavecallback: saveActiveEditor,
save_oncancelcallback: cancelActiveEditor
});
Then i define the function itself
function saveActiveEditor() {
var activeEditor = tinyMCE.activeEditor;
var saveUrl = "http://my.ajax.path/saveStuff";
var idEditor = activeEditor.id;
var contentEditor = activeEditor.getContent();
/* the next line is for a custom language listbox to edit different locales */
var localeEditor = activeEditor.controlManager.get('lbLanguages').selectedValue;
$.post(saveUrl ,
{ id: idEditor, content: contentEditor, locale: localeEditor },
function(results) {
if (results.Success) {
// switch back to display instead of edit
return false;
}
else {
activeEditor.windowManager.alert('Error saving data');
return false;
}
},
'json'
);
return false;
}
Don't forget to return false to override the default save action that posts back your data to the server.
edit to add: i only let the user change one tinymce instance at a time. You may want to change the locating the current instance to something else :)
edit #2: TinyMce already catches the Ctrl+s binding to process the data. Since it also cleans up html and is able to handle specific rules it's given when saving, the solution i propose is to plug your way of saving in tinyMce instead of fully overriding the Ctrl+s binding

The problem here is that the tinymce iframe does not delegate the events to the parent window. You can define custom_shortcuts in tinymce and/or use the following syntax:
// to delegate it to the parent window i use
var create_keydown_event = function(combo){
var e = { type : 'keydown' }, m = combo.split(/\+/);
for (var i=0, l=m.length; i<l; i++){
switch(m[i]){
case 'ctrl': e.metaKey = true;
case 'alt': case 'shift': e[m[i] + 'Key'] = true; break;
default : e.charCode = e.keyCode = e.which = m[i].toUpperCase().charCodeAt(0);
}
}
return e;
}
var handler = function(){
setTimeout(function(){
var e = create_keydown_event(combo);
window.parent.receiveShortCutEvent(e);
}, 1);
}
//ed.addShortcut(combo, description, handler);
ed.addShortcut('ctrl+s', 'save_shortcut', handler);
in the parent window you need a function receiveShortCutEvent which will sort out what to do with it