So I am trying to access all of a specific class name and then eventually ad an event listener to them. I'm doing it this way because I am building a hightcharts graph and cannot add click events specifically to the legend items. So after the graph is build I am trying to access the buttons and then add the event listener.
getButtons() {
let buttons = document.getElementsByClassName('legend-btn');
console.log(buttons);
console.log(buttons[0]);
},
The first console.log comes back with an HTMLCollection with a length of 48 (I know very long but for now it's more testing purposes than anything).
The second console.log comes back as undefined. Any ideas why? I was hoping to do something like this:
for (let i = 0; i < buttons.length; i++) {
buttons[i].addEventListener('click', function () {
changebackground(event);
});
}
Any suggestions for how I can add the click event for the newly built highcharts graph?
May I suggest that you try:
for (let button of buttons) {
button.addEventListener('click', changebackground);
}
I am not sure why you intended to call changebackground(event): in order to do that, you'd have to put event in the event listener's parentheses. Better pass changebackground directly (assuming it does take an event as a parameter).
I'm not quite sure about what I'm telling you: hard to tell without seeing more of the context.
Related
I'm trying to attach an event handler to the keyDown event in a canvas element. Here is a simplified version of my code.
class CanvasFun{
CanvasElement canvas;
CanvasFun(this.canvas){
print("Game is loading!");
this.canvas.onKeyDown.listen(handleInput);
}
void handleInput(e)
{
//breakpoint is never hit
print(e.keyCode);
}
}
I've removed some of the drawing code. In my main function I simply query the canvas element and pass it to my CanvasFun constructor.
I've also tried doing it this way:
void main() {
var canvas = query("#Game");
canvas.onKeyDown.listen(handleInput);
var canvasFun = new CanvasFun(canvas);
}
void handleInput(e)
{
print(e.keyCode);
}
The reason why the event is not firing is because the focus is on the document (or some other element like an input, for example). And in fact, canvas element even when focused does not fire an event. Some elements do, like input elements.
The solution is to listen to key down events from the document or window:
window.onKeyDown.listen(handleInput);
document.onKeyDown.listen(handleInput); // You already noticed this worked.
John McCutchan has written a nice Dart package to help handle keyboard input. You can read more about it here: http://dartgamedevs.org/blog/2012/12/11/keyboard-input/
Note that this library helps you handle input "correctly". You do not want to do any "work" in the input handling, instead you simply want to register that a key was pressed. You can check the state of any key presses inside of your requestAnimationFrame callback.
Hope that helps!
There exists a workaround to get the canvas-element accept KeyboardEvents:
Problems handling KeyboardEvents on DartFlash
Once you add the tabindex-attribute to your canvas-element, it can get the focus and then it will receive KeyboardEvents.
It looks like I can get it to work if I register the event on the document rather than the canvas element.
document.onKeyDown.listen(handleInput);
I have a problem with JQuery table sorter pager plugin.
I am trying to use paging with AJAX call. It seems to work OK for most cases, but I am unable to get the sorting working.
The problem is that when the request is made it always looks like (assuming the code from example here):
http:/mydatabase.com?page=0&size=100&{sortList:col}
just like the last parameter {sortList:col} is never actually replaced with proper sorting column.
If I'm reading the example correctly the request for sortList = [[2,0],[3,0]] should actually look like:
http:/mydatabase.com?page=0&size=100&col[2]=0&col[3]=0
But in my case it never is. Also when I click on the header the sorting is performed, but no request is made.
Is there anything I am missing in the linked example?
EDIT
The first part of my problem has been solved by replacing the plugin with the newest version.
For the second part, I still cannot get a request when clicking (sorting) columns. The ajaxProcessing function is almost exactly the same as in the example here, only headers variable is renamed.
As Mottie sugested I am posting an example result from AJAX call (MS MVC JsonResult):
{
"total_rows":1,
"headers":["Id.","Date","User name","File name","status","Hash","Link"],
"rows":[
{
"Id":"21",
"ReceiveDate":"02.12.2012",
"UserName":"John Doe",
"FileName":"test.txt",
"Status":"",
"Hash":"4A71FD2E12F7E04ED0C04E17476BD1BC5F823C8F",
"FileNameLink":"\u003ca style=\"padding-left:10px\" href=\"GetFile?Id=21&fileName=test.txt\"\u003eSave\u003c/a\u003e"
}]
}
Regards
I apologize, but I didn't get a chance to thoroughly test the latest changes to the pager. Some of the code was written by someone else, so I might have missed something obvious.
Anyway, this might be the bug that is causing you problems. It resets the table to the first page after each sort... I'll have fixed in the next update.
In the pager plugin, lines 460-470 is this code:
.bind('filterEnd.pager sortEnd.pager', function() {
//Prevent infinite event loops from occuring by setting this in all moveToPage calls and catching it here.
if ($.data(table, 'pagerUpdateTriggered')) {
$.data(table, 'pagerUpdateTriggered', false);
return;
}
c.page = 0;
updatePageDisplay(table, c);
moveToPage(table, c);
changeHeight(table, c);
})
Just change the c.page = 0 to this:
if (e.type === 'filterEnd') { c.page = 0; }
and add an e to the function(e).
I'm trying to dynamically populate a select tag at load time (latest jQM version) using a custom template filling function.
If the fn is called in the "pagebeforechange" event, the select tag is properly initialized. Since this event is called on every page transition, I thought of moving the fn to the 'pageinit' event. This does not work, presumably because the DOM is not yet fully available. How can I coerce jQM to inject content in a page only once? Currently, I am using a kludge. There surely must be a smarter way. Thanks for any suggestions.
$(document).bind('pageinit', function () {
InitSelTagTest("#selActTag", "tplTag"); // Does not work.
});
$(document).bind("pagebeforechange", function (e, data) {
if ($("#selActTag").children().size() === 0) {
InitSelTagTest("#selActTag", "tplTag"); // Kludge, but it works
}
});
function InitSelTagTest(el,tpl) { // Append all tags to element el
var lstAllTags = JSON.parse($("#hidTag").val()); // Create tag array
// Retrieve html content from template.
var cbeg = "//<![" + "CDATA[", cend = "//]" + "]>";
var rslt = tmpl(tpl, { ddd: lstAllTags }).replace(cbeg, ").replace(cend,");
$(el).html(rslt).trigger("create"); // Add to DOM.
}
EDIT
In response to Shenaniganz' comment, it seems that the "pagebeforecreate" event could do the trick ie.
$("#pgAct").live("pagebeforecreate", function () {
// Populate tag select. Works. Traversed only once.
InitSelTag("#selActTag", "tplTag");
});
I'm not sure I fully understand your question but I'll throw a few things out there and you let me know if I can extend further.
To make something trigger only once on page load you can try to implement a regular JQuery $(document).ready(function(){}) aka $(function(){}) for the exact reason why JQuery Mobile users are told not to use it. It triggers only once on DOM load. Further pages don't trigger it because they're being switched via Ajax.
Other than that, on regular dynamic content loading you take a look at the following example I put together for someone else earlier:
http://jsbin.com/ozejif/1/edit
I would like to know how to compose a click mouseevent of different objects in one listener, if ever that's possible.
What I wanted to do is make this listener universal for all the button clicks like:
stage.addEventListener(MouseEvent.CLICK,clicker);
function clicker (e:MouseEvent):void{
if (frame2_btn is clicked){
gotoAndPlay(3);
stage.removeEventListener(MouseEvent.CLICK,clicker);
}
if (frame3_btn is clicked){
gotoAndPlay(4);
stage.removeEventListener(MouseEvent.CLICK,clicker);
}
}
What is the way to do this?
It's really possible to write such function as all event bubbled through hierarchy (upward direction). And you can get the object that is responsible for generating that event using target attribute.
Here's a demo code for your reference ( For Actionscript and Haxe)
stage.addEventListener(MouseEvent.CLICK,clicker);
function clicker (e:MouseEvent):void{
if (e.target.name == "frame2_btn") {
gotoAndPlay(3);
stage.removeEventListener(MouseEvent.CLICK,clicker);
}
if (e.target.name == "frame3_btn"){
gotoAndPlay(4);
stage.removeEventListener(MouseEvent.CLICK,clicker);
}
}
Just make a extra attribute name in your every object( Sprite, shape,...there are many of them) which makes their identification little easier.
Hope this help you
Best Deepak
if you have a simple button, it should work no problem, if it's a movieclip, that acts as a button, then the children will give you a different name.
what do you get when you try
stage.addEventListener(MouseEvent.CLICK,clicker);
function clicker (e:MouseEvent):void{
trace(e.target.name);
}
I have two g:textfields
in the first one I should write a number lets say 12 and in the g:textfield next to it it should load the predetermined name for number 12.
The first one is named 'shipper' and the other 'shipperName'
Whenever I write the code 12 in the 'shipper' txtfield, it should return the name of the shipper in the 'shipperName' box.
Thanks in advance!
Examples:
If I write the number 12 it should return USPS
http://i53.tinypic.com/2i90mc.jpg
And every number should have a different 'shipperName'
Thanks again!
That's quite easy if you'll use jQuery. Check out the event handlers ("blur" is the one you want which occurs when the user leaves the numerical box).
For example:
$("#shipper").blur(function() {
$("#shipperName").load(
"${createLink(controller: 'shipper', action: 'resolveShipper')}?id=" +
$("#shipper").val()
);
});
The $(this).val() at the end is the value of the input field the user just left.
And the "ShipperController.resolveShipper" action would look something like this:
def resolveShipper = {
render text: Shipper.get(params.id).name, contentType: "text/plain"
}
There are other things you might want to do, like automatically filling in the shipperName field as the user types without leaving the edit field, probably after a delay. However the event handler stays the same, just the event is changing (from "blur" to "change" or something like this)
To relate two strings, it's easiest to use an object to create a dictionary/ map, as shown below;
$('#input1').bind('keyup',function() {
var map = {
"1":"One",
"2":"Fish",
"3":"Bar"
};
$('#input2').val(map[$(this).val()]);
});
You can see this in action here: http://www.jsfiddle.net/dCy6f/
If you want the second value only to update when the user has finished typing into the first input field, change "keyup" to "change".