How to catch a user input - meteor

I need to catch an user's input, precisely one specific button. I caught this in this way
Template.main.events({
'keypress input': function (e) {
if (e.charCode === 32) {
console.log("Hit");
};
}
});
and in the template it's something like this
<template name="main">
{{test_var}}
<input type="text">
</template>
It's works, but i need it without an input box on a page.

Template events are restricted to the piece of DOM contained within the template, and within that piece only form elements respond to keyboard events. To capture global keyboard events, you should use jQuery.
Template.main.rendered = function() {
$(document).on('keypress.mainTemplate', function() {
...
});
};
Template.main.destroyed = function() {
$(document).off('keypress.mainTemplate');
});

Related

Removing a window event listener in Template.onDestroyed

I have two templates that each contain a Vimeo iframe player. I'm using FlowRouter to render the templates through {{> Template.dynamic template=main}} on the main layout.
In both templates I add listeners for video events in onCreated
Template.view.onCreated( function() {
var self = this;
if (window.addEventListener) {
window.addEventListener('message', function(event) {
viewMessageReceived(event, self)}, false);
} else {
window.attachEvent('onmessage', function(event){
viewMessageReceived(event, self)}, false);
}
});
and destroy them in onDestroyed
Template.view.onDestroyed( function() {
if (window.removeEventListener) {
console.log('view remove');
window.removeEventListener('message', function(event) {
viewMessageReceived(event, self)}, false);
} else {
window.detachEvent('onmessage', function(event){
viewMessageReceived(event, self)}, false);
}
});
And here is the function being called by the anonymous event handler:
function viewMessageReceived(event, self) {
// Handle messages from the vimeo player only
if (!(/^https?:\/\/player.vimeo.com/).test(event.origin)) {
return false;
}
if (self.playerOrigin === '*') {
self.playerOrigin = event.origin;
}
var data = JSON.parse(event.data);
switch (data.event) {
case "ready":
initializePlayer(self);
break;
case "playProgress":
self.playerTime.set(data.data.seconds);
if (self.duration === '*') self.duration = data.data.duration;
break;
case "play":
self.playerStatus.set("playing");
break;
case "pause":
self.playerStatus.set("paused");
break;
}
}
When I switch to a different template, onDestroyed runs and my console.log('view remove') fires, as expected.
But then when I navigate to the page that loads the other template with a video player, a Vimeo "playProgress" message arrives that is received by the event handler in the previous video template, which was supposed to have been removed a while ago. This throws an error because the previous template has been destroyed.
Uncaught TypeError: Cannot read property 'contentWindow' of undefined
which comes from the last line in this function:
function post(template, action, value) {
console.log('view action: %s value: %s', action, value);
var data = {method: action};
if (value) data.value = value;
var message = JSON.stringify(data);
template.player[0].contentWindow.postMessage(message, template.playerOrigin);
}
Each of the video-containing templates have their own .js file, so they each have a their own post function declaration. My understanding is that defining a function that way scopes the function just to the page.
It's only one message that arrives for the wrong player. After that, they arrive for the currently loaded player.
Why does the Vimeo message event arrive or get handled after I've already destroyed the template and when I've moved to another player?
A quote from the W3Schools website regarding the removeEventListener() method:
// Attach an event handler to <div>
document.getElementById("myDIV").addEventListener("mousemove", myFunction);
// Remove the event handler from <div>
document.getElementById("myDIV").removeEventListener("mousemove", myFunction);
Note: To remove event handlers, the function specified with the
addEventListener() method must be an external function, like in the
example above (myFunction).
Anonymous functions, like "element.removeEventListener("event",
function(){ myScript });" will not work.
For this to work, you'll need to move your function definition somewhere outside of the onRendered and onDestroyed events, and just pass the function name in the add/remove event listeners.

Meteor: Most "Meteoric" way to clear form fields

I'm working on an example CRUD application with Meteor.js and am not sure how best to empty out the fields of a form. I need it in two places: when the Submit button is clicked, and when the Cancel button is clicked.
I implemented it this way by creating a utility function called clearFormFields() that just uses jQuery to empty their contents, but it doesn't feel as "Meteoric" as it should; I feel it should be scoped better so it doesn't have a global visibility. What am I doing wrong?
function clearFormFields() {
$("#description").val("");
$("#priority").val("");
}
Template.todoNew.events({
'click #cancel': function(event) {
event.preventDefault();
Session.set('editing', false);
clearFormFields();
},
'submit form': function(event) {
event.preventDefault();
var theDocument = {
description: event.target.description.value,
priority: event.target.priority.value
};
if (Session.get("editing")) {
Meteor.call("updateTodo", theDocument, Session.get('theDocumentId'))
}
else {
Meteor.call("insertTodo", theDocument);
}
Session.set('editing', false);
clearFormFields();
/* Could do this twice but hate the code duplication.
description: event.target.description.value = "";
priority: event.target.priority.value = "";
*/
}
});
You could use the native reset method of the DOM form node ?
"submit form":function(event,template){
event.preventDefault();
// ...
template.find("form").reset();
}
http://www.w3schools.com/jsref/met_form_reset.asp
The DOM object that originated the event can be accessed and reset from through event.target.reset();
"submit form":function(event){
event.preventDefault();
//...
event.target.reset();
}
http://docs.meteor.com/#/full/eventmaps

Meteor.renderList alway end up in [elseFunc]

I'm new to Meteor.
Trying to render items from collection but Meteor.renderList(observable, docFunc, [elseFunc]) alway go to elseFunc.
this.ComponentViewOrdersFlow = Backbone.View.extend({
template: null,
initialize: function() {
var frag;
Template.ordersFlow.events = {
"click a": function(e) {
return App.router.aReplace(e);
}
};
this.template = Meteor.render(function() {
return Template.ordersFlow();
});
console.log(Colors);
frag = Meteor.renderList(
Colors.find(),
function(color) {
console.log(color);
},
function() {
console.log('else consdition');
}
);
},
render: function() {
this.$el.html(this.template);
return this;
}
});
Initially I thought that Collection is empty, but console.log(Colors) shows that there are items in collection. Moreover if I use Meteor.render(... -> Template.colors({colors: Colors.find()}) ) it renders template end show Collection items there.
Meteor version 0.6.6.3 (Windows 7, 64bit)
Mongo - connected to MongoLab
Thank you for any help.
Jev.
Can't really explain this well in the comments, so here is a very, very simple example of using the Meteor template engine. This is a 100% functional app, showcasing basic reactivity. Note that I never call render() or renderList() anywhere.
All this app does is show a button, that when clicked, adds a number to a list. The number is reactively added to the list, even though I never do anything to make that reactivity explicit. Meteor's templates are automatically reactive! Try it out - this is all of the code.
numbers.html:
<body>
{{> numberList}}
</body>
<template name="numberList">
<ul>
{{#each numbers}}
<li>{{number}}</li>
{{/each}}
</ul>
<button>Click Me</button>
</template>
numbers.js:
var Numbers = new Meteor.Collection("numbers");
if (Meteor.isClient) {
Template.numberList.numbers = function() {
return Numbers.find();
};
var idx = 0;
Template.numberList.events({
"click button": function() {
Numbers.insert({
number: idx
});
idx++;
}
});
}

How to implement editable text in Meteor and DRY?

I have come up with a methodology for making editable text in my Meteor app. However, it does not follow the DRY paradigm and I'd like to change that but I am not too good with Javascript yet...
Suppose I have a table cell with some text and I'd like to double click it to edit it. I created a template variable to handle this:
<td class="itemName">
{{#unless editItemName}}
{{name}}
{{else}}
<input class="editItemName" type="text" value="{{name}}" style="width:100px;">
{{/unless}}
</td>
I then create an event to execute this transition on a double-click:
Template.inventoryItemDetail.events = {
'dblclick td.itemName': function (evt) {
Session.set("editItemName",true);
},
'blur input.editItemName': function () {
Session.set("editItemName",null);
},};
I also reused the ok_cancel code from the ToDo's example app (but that's sort of irrelevant):
// Returns an event_map key for attaching "ok/cancel" events to
// a text input (given by selector)
var okcancel_events = function (selector) {
return 'keyup '+selector+', keydown '+selector+', focusout '+selector;
};
// Creates an event handler for interpreting "escape", "return", and "blur"
// on a text field and calling "ok" or "cancel" callbacks.
var make_okcancel_handler = function (options) {
var ok = options.ok || function () {};
var cancel = options.cancel || function () {};
return function (evt) {
if (evt.type === "keydown" && evt.which === 27) {
// escape = cancel
cancel.call(this, evt);
evt.currentTarget.blur();
} else if (evt.type === "keyup" && evt.which === 13) {
// blur/return/enter = ok/submit if non-empty
var value = String(evt.target.value || "");
if (value) {
ok.call(this, value, evt);
evt.currentTarget.blur();
}
else {
cancel.call(this, evt);
evt.currentTarget.blur();
}
}
};
};
Template.inventoryItemDetail.events[ okcancel_events('input.editItemName') ] = make_okcancel_handler({
ok: function (value) {
Items.update(this._id, {$set: {name: value}});
}
});
Finally, I have to tie this Session variable to the template variable:
Template.inventoryItemDetail.editItemName = function () {
return Session.get("editItemName");
};
So right now, I have repeated all of this again and again for each editable text field and it all works, but it seems like terribly programming practice. I have found various editable text utilities on Github but I don't entirely understand them and none of them are for Meteor!
I'd really like to expand my knowledge of Meteor and Javascript by creating a tool that allows me to have editable text without repeating myself this ridiculous amount for each editable text field.
Thanks,
Chet
https://github.com/nate-strauser/meteor-x-editable-bootstrap for the package.
http://vitalets.github.io/x-editable/docs.html for the docs.
I just implemented this in my project and I won't ever go back to contenteditable.

How can I delay a reactive Meteor template from updating an HTML template variable, when a Meteor.call() updates the database instantly?

I'm developing a keno game. When the user presses the start button a Meteor.Call() executes everything for that card pick. Including updating the user balance. I have a setTimeout for the winning numbers, so that they display over a period of about 20 seconds. The problem is that when the call is made, the balance updates instantly, and then the numbers start displaying with the delay. I not familiar with how to solve this. I appreciate any help.
server-side:
Meteor.methods({
process: function(){
// generate numbers
// update user balance
}
});
client-side:
Template.keno.events({
'click #start' : function(){
Meteor.call('process',function(err,numbers){
//setTimeout on displaying numbers
// as setTimeout displays numbers, balance already updated. I need to delay
// the balance update, until all numbers are displayed.
// otherwise, the player see that they won before all numbers come out.
});
}
});
** Update **
The only help I need is to understand how to make a variable like {{balance}} unreactive, until I finish the setTimeout, and then have it update. Should I be using sessions? Should I not use a template variable and instead, insert the balance with jquery? It's just a simple solution, the difficulty is that I don't know what function / method I'm looking for that can help me turn off the reactivity for a set amount of time, and then update, after the Meteor.call() for then numbers finishes it's setTimeout.
If I understand your situation correctly, you need the template {{balance}} expression to be set at a time you decide vs. when the collection gets a result from the server. So you could use Session to set a value when you like. Below is an example:
<body>
{{> game}}
</body>
<template name="game">
<button id="process">Process</button>
<div>{{firstNumber}}</div>
<div>{{secondNumber}}</div>
<div>balance: {{balance}}</div>
</template>
if (Meteor.isClient) {
Template.game.events({
'click #process': function (e, tmpl) {
Meteor.call('process', function (err, result) {
Session.set('firstNumber', result[0]);
setTimeout(function () {
Session.set('secondNumber', result[1]);
Session.set('balance', result[0] + result[1]);
}, 2000);
});
}
});
Template.game.helpers({
firstNumber: function () { return Session.get('firstNumber'); },
secondNumber: function () { return Session.get('secondNumber'); },
balance: function () { return Session.get('balance'); }
});
}
if (Meteor.isServer) {
function randomNumber () {
return Math.floor(Math.random() * 100);
}
Meteor.methods({
process: function () {
return [randomNumber(), randomNumber()];
}
});
}
Try to wrap your Meteor.call() inside the setTimeout() itself, like:
Template.keno.events({
'click #start' : function(){
setTimeout(function(){
Meteor.call('process',function(){
//do something.
});
}, 20000);
}
});
Maybe the solution is to use reactivity on a duplicated collection :
You set your main collection on server side only.
You create another collection on the client side that will be a duplicate collection but used only for display
Then you pusblish the main collection to the client.
On the client side, you set all required observer on it that will replicate all modification on the duplicated collection. But this way you can manage animation or any other wished features. All actions on client side will do call on server-side but it won't affect immediatly the templates because the templates only use the duplicated collections.
I hope it will help you.
OK, so I threw this demo together in 5 mins, works though.
Here's the demo: http://keno-test.meteor.com/
Of course it needs LOT's more work, but the delayed thing works.
HTML:
<head>
<title>keno-test</title>
</head>
<body>
{{> hello}}
</body>
<template name="hello">
<input id="callCardThing" type="button" value="Start card-thing" />
<h1>Here are the cards!</h1>
<ul>
{{#each cards}}
<li>{{value}}</li>
{{/each}}
</ul>
</template>
JS:
Cards = new Meteor.Collection('cards');
if (Meteor.isClient) {
Deps.autorun(function () {
Meteor.subscribe("cards");
});
Template.hello.events({
"click #callCardThing": function (event) {
Meteor.call("doCardThingOnServer");
}
});
Template.hello.helpers({
cards: function () {
return Cards.find({});
}
});
}
if (Meteor.isServer) {
Meteor.startup(function () {
Meteor.publish("cards", function () {
return Cards.find({});
});
});
Meteor.methods({
doCardThingOnServer: function () {
// I remove all the cards every time just for the demo…
Cards.remove({});
var numberOfcards = 10;
var counter = Meteor.setInterval(function () {
Cards.insert({value: 'whatever! no: '+numberOfcards });
numberOfcards--;
if (numberOfcards < 1) Meteor.clearInterval(counter);
}, 1500);
}
});
}
Ok, so how about conditional {{balance}} rendering?
var shouldRender = false;
setTimeout(function () {
shouldRender = true;
}, 2000);
Template.template_name.shouldRender = function () {
return shouldRender;
}
{{#if shouldRender}}
{{>balance}}
{{/if}}
Have a look at the Atmosphere animation package : https://atmosphere.meteor.com/package/animation!
I've just done this package to explore one way of doing animation on database reactivity.
You have to register a cursor and the template to animate. There is a project that will show you how to do that.
I hope it will help you.

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