writefreely/static/js/h.js

258 lines
6.2 KiB
JavaScript

/**
* H.js
*
* Lightweight, extremely bare-bones library for manipulating the DOM and
* saving some typing.
*/
var Element = function(domElement) {
this.el = domElement;
};
/**
* Creates a toggle button that adds / removes the given class name from the
* given element.
*
* @param {Element} $el - The element to modify.
* @param {string} onClass - The class to add to the given element.
* @param {function} onFunc - Additional actions when toggling on.
* @param {function} offFunc - Additional actions when toggling off.
*/
Element.prototype.createToggle = function($el, onClass, onFunc, offFunc) {
this.on('click', function(e) {
if ($el.el.className === '') {
$el.el.className = onClass;
onFunc(new Element(this), e);
} else {
$el.el.className = '';
offFunc(new Element(this), e);
}
e.preventDefault();
}, false);
};
Element.prototype.on = function(event, func) {
events = event.split(' ');
var el = this.el;
if (el == null) {
console.error("Error: element for event is null");
return;
}
var addEvent = function(e) {
if (el.addEventListener) {
el.addEventListener(e, func, false);
} else if (el.attachEvent) {
el.attachEvent(e, func);
}
};
if (events.length === 1) {
addEvent(event);
} else {
for(var i=0; i<events.length; i++) {
addEvent(events[i]);
}
}
};
Element.prototype.setClass = function(className) {
if (this.el == null) {
console.error("Error: element to set class on is null");
return;
}
this.el.className = className;
};
Element.prototype.removeClass = function(className) {
if (this.el == null) {
console.error("Error: element to remove class on is null");
return;
}
var regex = new RegExp(' ?' + className, 'g');
this.el.className = this.el.className.replace(regex, '');
};
Element.prototype.text = function(text, className) {
if (this.el == null) {
console.error("Error: element for setting text is null");
return;
}
if (this.el.textContent !== text) {
this.el.textContent = text;
if (typeof className !== 'undefined') {
this.el.className = this.el.className + ' ' + className;
}
}
};
Element.prototype.insertAfter = function(newNode) {
if (this.el == null) {
console.error("Error: element for insertAfter is null");
return;
}
this.el.parentNode.insertBefore(newNode, this.el.nextSibling);
};
Element.prototype.remove = function() {
if (this.el == null) {
console.error("Didn't remove element");
return;
}
this.el.parentNode.removeChild(this.el);
};
Element.prototype.hide = function() {
if (this.el == null) {
console.error("Didn't hide element");
return;
}
this.el.className += ' effect fade-out';
};
Element.prototype.show = function() {
if (this.el == null) {
console.error("Didn't show element");
return;
}
this.el.className += ' effect';
};
var H = {
getEl: function(elementId) {
return new Element(document.getElementById(elementId));
},
save: function($el, key) {
localStorage.setItem(key, $el.el.value);
},
load: function($el, key, onlyLoadPopulated) {
var val = localStorage.getItem(key);
if (onlyLoadPopulated && val == null) {
// Do nothing
return;
}
$el.el.value = val;
},
set: function(key, value) {
localStorage.setItem(key, value);
},
get: function(key, defaultValue) {
var val = localStorage.getItem(key);
if (val == null) {
val = defaultValue;
}
return val;
},
remove: function(key) {
localStorage.removeItem(key);
},
exists: function(key) {
return localStorage.getItem(key) !== null;
},
createPost: function(id, editToken, content, created) {
var summaryLen = 200;
var titleLen = 80;
var getPostMeta = function(content) {
var eol = content.indexOf("\n");
if (content.indexOf("# ") === 0) {
// Title is in the format:
//
// # Some title
var summary = content.substring(eol).trim();
if (summary.length > summaryLen) {
summary = summary.substring(0, summaryLen) + "...";
}
return {
title: content.substring("# ".length, eol),
summary: summary,
};
}
var blankLine = content.indexOf("\n\n");
if (blankLine !== -1 && blankLine <= eol && blankLine <= titleLen) {
// Title is in the format:
//
// Some title
//
// The body starts after that blank line above it.
var summary = content.substring(blankLine).trim();
if (summary.length > summaryLen) {
summary = summary.substring(0, summaryLen) + "...";
}
return {
title: content.substring(0, blankLine),
summary: summary,
};
}
// TODO: move this to the beginning
var title = content.trim();
var summary = "";
if (title.length > titleLen) {
// Content can't fit in the title, so figure out the summary
summary = title;
title = "";
if (summary.length > summaryLen) {
summary = summary.substring(0, summaryLen) + "...";
}
} else if (eol > 0) {
summary = title.substring(eol+1);
title = title.substring(0, eol);
}
return {
title: title,
summary: summary
};
};
var post = getPostMeta(content);
post.id = id;
post.token = editToken;
post.created = created ? new Date(created) : new Date();
post.client = "Pad";
return post;
},
getTitleStrict: function(content) {
var eol = content.indexOf("\n");
var title = "";
var newContent = content;
if (content.indexOf("# ") === 0) {
// Title is in the format:
// # Some title
if (eol !== -1) {
// First line should start with # and end with \n
newContent = content.substring(eol).leftTrim();
title = content.substring("# ".length, eol);
}
}
return {
title: title,
content: newContent
};
},
};
var He = {
create: function(name) {
return document.createElement(name);
},
get: function(id) {
return document.getElementById(id);
},
$: function(selector) {
var els = document.querySelectorAll(selector);
return els;
},
postJSON: function(url, params, callback) {
var http = new XMLHttpRequest();
http.open("POST", url, true);
// Send the proper header information along with the request
http.setRequestHeader("Content-type", "application/json");
http.onreadystatechange = function() {
if (http.readyState == 4) {
callback(http.status, JSON.parse(http.responseText));
}
}
http.send(JSON.stringify(params));
},
};
String.prototype.leftTrim = function() {
return this.replace(/^\s+/,"");
};