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101502026 #48

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76 changes: 39 additions & 37 deletions homework/content.js
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Original file line number Diff line number Diff line change
@@ -1,37 +1,39 @@
'use strict';

(function() {
var _wrapper = document.querySelector('#note-content-wrapper');

function start() {
window.addEventListener('note-open', function(event) {
var note = event.detail;
resetWrapper();
drawNote(note);
});
}

function resetWrapper() {
_wrapper.innerHTML = '';
}

function drawNote(note) {
var title = note.title;
var h = document.createElement('h2');
h.textContent = title;
var passages = note.passages;
var buff = document.createDocumentFragment();
passages.forEach(function(passage) {
var p = document.createElement('p');
p.classList.add('note-passage');
p.textContent = passage;
buff.appendChild(p);
});
_wrapper.appendChild(h);
_wrapper.appendChild(buff);
}

document.addEventListener('DOMContentLoaded', function(event) {
start();
});
})();
'use strict';

function Content() {
this._wrapper = document.querySelector('#note-content-wrapper');
}

Content.prototype = {

start : function () {
window.addEventListener('note-open', (function(event) {
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@snowmantw snowmantw Nov 7, 2015

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Instead of using an anonymous function, set the listener as this and handle events with handleEvent method is better.

var note = event.detail;
this.resetWrapper();
this.drawNote(note);
}).bind(this));
},
resetWrapper : function () {
this._wrapper.innerHTML = '';
},

drawNote : function (note) {
var title = note.title;
var h = document.createElement('h2');
h.textContent = title;
var passages = note.passages;
var buff = document.createDocumentFragment();
passages.forEach(function(passage) {
var p = document.createElement('p');
p.classList.add('note-passage');
p.textContent = passage;
buff.appendChild(p);
});
this._wrapper.appendChild(h);
this._wrapper.appendChild(buff);
}
};
var content = new Content();
document.addEventListener('DOMContentLoaded', function(event) {
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@snowmantw snowmantw Nov 7, 2015

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It's better to put all startup code like this in one method, rather than two native handlers like this.

content.start();
});
165 changes: 86 additions & 79 deletions homework/list.js
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Original file line number Diff line number Diff line change
@@ -1,79 +1,86 @@
'use strict';

(function() {

var _listNoteContent = [];
var _wrapper = document.querySelector('#note-list-wrapper');

function start() {
fetchList(function(data) {
updateList(data);
drawList();
preloadFirstNote();
});
window.addEventListener('click', function(event) {
onNoteOpen(event);
});
}

function onNoteOpen(event) {
if (event.target.classList.contains('note-title')) {
var id = event.target.dataset.noteId;
var content = _listNoteContent[id];
window.dispatchEvent(new CustomEvent('note-open',
{ detail: content }));
};
}

function preloadFirstNote() {
if (_listNoteContent.length !== 0) {
var content = _listNoteContent[0];
window.dispatchEvent(new CustomEvent('note-open',
{ detail: content }));
}
}

function updateList(list) {
_listNoteContent = list;
}

function drawList() {
var list = _listNoteContent;
var ul = document.createElement('ul');
ul.id = 'note-title-list';
var buff = document.createDocumentFragment();
list.forEach(function(note, i) {
var li = document.createElement('li');
li.dataset.noteId = i;
li.classList.add('note-title');
li.textContent = note.title;
// Note: buff is captured, so we now have a
// little closure naturally.
buff.appendChild(li);
});
ul.appendChild(buff);
_wrapper.appendChild(ul);
}

function fetchList(afterFetch) {
var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://127.0.0.1:8000/demo-list-notes.json', true);
xhr.responseType = 'json';
xhr.onreadystatechange = function(e) {
// Watch out: we have a mysterious unknown 'this'.
if (this.readyState === 4 && this.status === 200) {
var listData = this.response;
// The flow ends here.
afterFetch(listData);
} else if (this.status !== 200 ){
// Ignore error in this case.
}
};
xhr.send();
}

document.addEventListener('DOMContentLoaded', function(event) {
start();
});

})();
'use strict';

function List() {
this._listNoteContent = [];
this._wrapper = document.querySelector('#note-list-wrapper');
}

List.prototype = {
start : function () {
this.fetchList().then(function (data){
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@snowmantw snowmantw Nov 7, 2015

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You can re-write the chain as

this.fetchList().then(this.updateList.bind(this))
                      .then(this.drawList.bind(this))

It's more concise.

console.log(this);
this.updateList(data);
}.bind(this)).then(
this.drawList.bind(this)
).then(
this.preloadFirstNote.bind(this)
);
window.addEventListener('click', function(event) {
this.onNoteOpen(event).bind(this);
});
},

onNoteOpen : function (event) {
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@snowmantw snowmantw Nov 7, 2015

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Well it's a convention to prefix with on to handle the corresponding event, rather than to fire it. So, you should rename this function as onClick and to dispatch the note-open.

if (event.target.classList.contains('note-title')) {
var id = event.target.dataset.noteId;
var content = this._listNoteContent[id];
window.dispatchEvent(new CustomEvent('note-open',
{ detail: content }));
};
},

preloadFirstNote : function () {
if (this._listNoteContent.length !== 0) {
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@snowmantw snowmantw Nov 7, 2015

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nit: It's better to put the condition outside a function wholly wrapped by only one branch.

var content = this._listNoteContent[0];
window.dispatchEvent(new CustomEvent('note-open',
{ detail: content }));
}
},

updateList : function (list) {
this._listNoteContent = list;
},

drawList : function () {
var list = this._listNoteContent;
var ul = document.createElement('ul');
ul.id = 'note-title-list';
var buff = document.createDocumentFragment();
list.forEach(function(note, i) {
var li = document.createElement('li');
li.dataset.noteId = i;
li.classList.add('note-title');
li.textContent = note.title;
// Note: buff is captured, so we now have a
// little closure naturally.
buff.appendChild(li);
});
ul.appendChild(buff);
this._wrapper.appendChild(ul);
},

fetchList : function () {
return new Promise(function (resolve, reject) {
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@snowmantw snowmantw Nov 7, 2015

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Good, you have successfully "Promisified" the method.

var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://127.0.0.1:8000/homework/demo-list-notes.json', true);
xhr.responseType = 'json';
xhr.onreadystatechange = function(e) {
// Watch out: we have a mysterious unknown 'this'.
if (this.readyState === 4 && this.status === 200) {

var listData = this.response;
// The flow ends here.
resolve(listData);
} else if (this.status !== 200 ){
// Ignore error in this case.
}
};
xhr.send();
});
}
};
var list = new List();
document.addEventListener('DOMContentLoaded', function(event) {
list.start();
});