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html.js
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html.js
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define(["./_base/kernel", "./_base/lang", "./_base/array", "./_base/declare", "./dom", "./dom-construct", "./parser"],
function(kernel, lang, darray, declare, dom, domConstruct, parser) {
// module:
// dojo/html
// summary:
// TODOC
var html = lang.getObject("dojo.html", true);
/*=====
dojo.html = {
// summary:
// TODO
};
html = dojo.html;
=====*/
// the parser might be needed..
// idCounter is incremented with each instantiation to allow asignment of a unique id for tracking, logging purposes
var idCounter = 0;
html._secureForInnerHtml = function(/*String*/ cont){
// summary:
// removes !DOCTYPE and title elements from the html string.
//
// khtml is picky about dom faults, you can't attach a style or <title> node as child of body
// must go into head, so we need to cut out those tags
// cont:
// An html string for insertion into the dom
//
return cont.replace(/(?:\s*<!DOCTYPE\s[^>]+>|<title[^>]*>[\s\S]*?<\/title>)/ig, ""); // String
};
/*====
dojo.html._emptyNode = function(node){
// summary:
// removes all child nodes from the given node
// node: DOMNode
// the parent element
};
=====*/
html._emptyNode = domConstruct.empty;
html._setNodeContent = function(/* DomNode */ node, /* String|DomNode|NodeList */ cont){
// summary:
// inserts the given content into the given node
// node:
// the parent element
// content:
// the content to be set on the parent element.
// This can be an html string, a node reference or a NodeList, dojo.NodeList, Array or other enumerable list of nodes
// always empty
domConstruct.empty(node);
if(cont) {
if(typeof cont == "string") {
cont = domConstruct.toDom(cont, node.ownerDocument);
}
if(!cont.nodeType && lang.isArrayLike(cont)) {
// handle as enumerable, but it may shrink as we enumerate it
for(var startlen=cont.length, i=0; i<cont.length; i=startlen==cont.length ? i+1 : 0) {
domConstruct.place( cont[i], node, "last");
}
} else {
// pass nodes, documentFragments and unknowns through to dojo.place
domConstruct.place(cont, node, "last");
}
}
// return DomNode
return node;
};
// we wrap up the content-setting operation in a object
declare("dojo.html._ContentSetter", null,
{
// node: DomNode|String
// An node which will be the parent element that we set content into
node: "",
// content: String|DomNode|DomNode[]
// The content to be placed in the node. Can be an HTML string, a node reference, or a enumerable list of nodes
content: "",
// id: String?
// Usually only used internally, and auto-generated with each instance
id: "",
// cleanContent: Boolean
// Should the content be treated as a full html document,
// and the real content stripped of <html>, <body> wrapper before injection
cleanContent: false,
// extractContent: Boolean
// Should the content be treated as a full html document, and the real content stripped of <html>, <body> wrapper before injection
extractContent: false,
// parseContent: Boolean
// Should the node by passed to the parser after the new content is set
parseContent: false,
// parserScope: String
// Flag passed to parser. Root for attribute names to search for. If scopeName is dojo,
// will search for data-dojo-type (or dojoType). For backwards compatibility
// reasons defaults to dojo._scopeName (which is "dojo" except when
// multi-version support is used, when it will be something like dojo16, dojo20, etc.)
parserScope: kernel._scopeName,
// startup: Boolean
// Start the child widgets after parsing them. Only obeyed if parseContent is true.
startup: true,
// lifecyle methods
constructor: function(/* Object */params, /* String|DomNode */node){
// summary:
// Provides a configurable, extensible object to wrap the setting on content on a node
// call the set() method to actually set the content..
// the original params are mixed directly into the instance "this"
lang.mixin(this, params || {});
// give precedence to params.node vs. the node argument
// and ensure its a node, not an id string
node = this.node = dom.byId( this.node || node );
if(!this.id){
this.id = [
"Setter",
(node) ? node.id || node.tagName : "",
idCounter++
].join("_");
}
},
set: function(/* String|DomNode|NodeList? */ cont, /* Object? */ params){
// summary:
// front-end to the set-content sequence
// cont:
// An html string, node or enumerable list of nodes for insertion into the dom
// If not provided, the object's content property will be used
if(undefined !== cont){
this.content = cont;
}
// in the re-use scenario, set needs to be able to mixin new configuration
if(params){
this._mixin(params);
}
this.onBegin();
this.setContent();
this.onEnd();
return this.node;
},
setContent: function(){
// summary:
// sets the content on the node
var node = this.node;
if(!node) {
// can't proceed
throw new Error(this.declaredClass + ": setContent given no node");
}
try{
node = html._setNodeContent(node, this.content);
}catch(e){
// check if a domfault occurs when we are appending this.errorMessage
// like for instance if domNode is a UL and we try append a DIV
// FIXME: need to allow the user to provide a content error message string
var errMess = this.onContentError(e);
try{
node.innerHTML = errMess;
}catch(e){
console.error('Fatal ' + this.declaredClass + '.setContent could not change content due to '+e.message, e);
}
}
// always put back the node for the next method
this.node = node; // DomNode
},
empty: function() {
// summary
// cleanly empty out existing content
// destroy any widgets from a previous run
// NOTE: if you don't want this you'll need to empty
// the parseResults array property yourself to avoid bad things happening
if(this.parseResults && this.parseResults.length) {
darray.forEach(this.parseResults, function(w) {
if(w.destroy){
w.destroy();
}
});
delete this.parseResults;
}
// this is fast, but if you know its already empty or safe, you could
// override empty to skip this step
html._emptyNode(this.node);
},
onBegin: function(){
// summary
// Called after instantiation, but before set();
// It allows modification of any of the object properties
// - including the node and content provided - before the set operation actually takes place
// This default implementation checks for cleanContent and extractContent flags to
// optionally pre-process html string content
var cont = this.content;
if(lang.isString(cont)){
if(this.cleanContent){
cont = html._secureForInnerHtml(cont);
}
if(this.extractContent){
var match = cont.match(/<body[^>]*>\s*([\s\S]+)\s*<\/body>/im);
if(match){ cont = match[1]; }
}
}
// clean out the node and any cruft associated with it - like widgets
this.empty();
this.content = cont;
return this.node; /* DomNode */
},
onEnd: function(){
// summary
// Called after set(), when the new content has been pushed into the node
// It provides an opportunity for post-processing before handing back the node to the caller
// This default implementation checks a parseContent flag to optionally run the dojo parser over the new content
if(this.parseContent){
// populates this.parseResults if you need those..
this._parse();
}
return this.node; /* DomNode */
},
tearDown: function(){
// summary
// manually reset the Setter instance if its being re-used for example for another set()
// description
// tearDown() is not called automatically.
// In normal use, the Setter instance properties are simply allowed to fall out of scope
// but the tearDown method can be called to explicitly reset this instance.
delete this.parseResults;
delete this.node;
delete this.content;
},
onContentError: function(err){
return "Error occurred setting content: " + err;
},
_mixin: function(params){
// mix properties/methods into the instance
// TODO: the intention with tearDown is to put the Setter's state
// back to that of the original constructor (vs. deleting/resetting everything regardless of ctor params)
// so we could do something here to move the original properties aside for later restoration
var empty = {}, key;
for(key in params){
if(key in empty){ continue; }
// TODO: here's our opportunity to mask the properties we don't consider configurable/overridable
// .. but history shows we'll almost always guess wrong
this[key] = params[key];
}
},
_parse: function(){
// summary:
// runs the dojo parser over the node contents, storing any results in this.parseResults
// Any errors resulting from parsing are passed to _onError for handling
var rootNode = this.node;
try{
// store the results (widgets, whatever) for potential retrieval
var inherited = {};
darray.forEach(["dir", "lang", "textDir"], function(name){
if(this[name]){
inherited[name] = this[name];
}
}, this);
this.parseResults = parser.parse({
rootNode: rootNode,
noStart: !this.startup,
inherited: inherited,
scope: this.parserScope
});
}catch(e){
this._onError('Content', e, "Error parsing in _ContentSetter#"+this.id);
}
},
_onError: function(type, err, consoleText){
// summary:
// shows user the string that is returned by on[type]Error
// override/implement on[type]Error and return your own string to customize
var errText = this['on' + type + 'Error'].call(this, err);
if(consoleText){
console.error(consoleText, err);
}else if(errText){ // a empty string won't change current content
html._setNodeContent(this.node, errText, true);
}
}
}); // end declare()
html.set = function(/* DomNode */ node, /* String|DomNode|NodeList */ cont, /* Object? */ params){
// summary:
// inserts (replaces) the given content into the given node. dojo.place(cont, node, "only")
// may be a better choice for simple HTML insertion.
// description:
// Unless you need to use the params capabilities of this method, you should use
// dojo.place(cont, node, "only"). dojo.place() has more robust support for injecting
// an HTML string into the DOM, but it only handles inserting an HTML string as DOM
// elements, or inserting a DOM node. dojo.place does not handle NodeList insertions
// or the other capabilities as defined by the params object for this method.
// node:
// the parent element that will receive the content
// cont:
// the content to be set on the parent element.
// This can be an html string, a node reference or a NodeList, dojo.NodeList, Array or other enumerable list of nodes
// params:
// Optional flags/properties to configure the content-setting. See dojo.html._ContentSetter
// example:
// A safe string/node/nodelist content replacement/injection with hooks for extension
// Example Usage:
// dojo.html.set(node, "some string");
// dojo.html.set(node, contentNode, {options});
// dojo.html.set(node, myNode.childNodes, {options});
if(undefined == cont){
console.warn("dojo.html.set: no cont argument provided, using empty string");
cont = "";
}
if(!params){
// simple and fast
return html._setNodeContent(node, cont, true);
}else{
// more options but slower
// note the arguments are reversed in order, to match the convention for instantiation via the parser
var op = new html._ContentSetter(lang.mixin(
params,
{ content: cont, node: node }
));
return op.set();
}
};
return html;
});