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332 lines
11 KiB
JavaScript
332 lines
11 KiB
JavaScript
/*
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Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojo.html"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.html"] = true;
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dojo.provide("dojo.html");
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// the parser might be needed..
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dojo.require("dojo.parser");
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(function(){ // private scope, sort of a namespace
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// idCounter is incremented with each instantiation to allow asignment of a unique id for tracking, logging purposes
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var idCounter = 0,
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d = dojo;
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dojo.html._secureForInnerHtml = function(/*String*/ cont){
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// summary:
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// removes !DOCTYPE and title elements from the html string.
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//
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// khtml is picky about dom faults, you can't attach a style or <title> node as child of body
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// must go into head, so we need to cut out those tags
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// cont:
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// An html string for insertion into the dom
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//
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return cont.replace(/(?:\s*<!DOCTYPE\s[^>]+>|<title[^>]*>[\s\S]*?<\/title>)/ig, ""); // String
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};
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/*====
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dojo.html._emptyNode = function(node){
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// summary:
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// removes all child nodes from the given node
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// node: DOMNode
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// the parent element
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};
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=====*/
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dojo.html._emptyNode = dojo.empty;
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dojo.html._setNodeContent = function(/* DomNode */ node, /* String|DomNode|NodeList */ cont){
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// summary:
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// inserts the given content into the given node
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// node:
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// the parent element
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// content:
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// the content to be set on the parent element.
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// This can be an html string, a node reference or a NodeList, dojo.NodeList, Array or other enumerable list of nodes
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// always empty
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d.empty(node);
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if(cont) {
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if(typeof cont == "string") {
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cont = d._toDom(cont, node.ownerDocument);
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}
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if(!cont.nodeType && d.isArrayLike(cont)) {
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// handle as enumerable, but it may shrink as we enumerate it
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for(var startlen=cont.length, i=0; i<cont.length; i=startlen==cont.length ? i+1 : 0) {
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d.place( cont[i], node, "last");
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}
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} else {
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// pass nodes, documentFragments and unknowns through to dojo.place
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d.place(cont, node, "last");
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}
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}
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// return DomNode
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return node;
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};
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// we wrap up the content-setting operation in a object
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dojo.declare("dojo.html._ContentSetter", null,
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{
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// node: DomNode|String
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// An node which will be the parent element that we set content into
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node: "",
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// content: String|DomNode|DomNode[]
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// The content to be placed in the node. Can be an HTML string, a node reference, or a enumerable list of nodes
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content: "",
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// id: String?
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// Usually only used internally, and auto-generated with each instance
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id: "",
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// cleanContent: Boolean
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// Should the content be treated as a full html document,
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// and the real content stripped of <html>, <body> wrapper before injection
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cleanContent: false,
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// extractContent: Boolean
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// Should the content be treated as a full html document, and the real content stripped of <html>, <body> wrapper before injection
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extractContent: false,
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// parseContent: Boolean
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// Should the node by passed to the parser after the new content is set
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parseContent: false,
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// lifecyle methods
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constructor: function(/* Object */params, /* String|DomNode */node){
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// summary:
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// Provides a configurable, extensible object to wrap the setting on content on a node
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// call the set() method to actually set the content..
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// the original params are mixed directly into the instance "this"
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dojo.mixin(this, params || {});
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// give precedence to params.node vs. the node argument
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// and ensure its a node, not an id string
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node = this.node = dojo.byId( this.node || node );
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if(!this.id){
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this.id = [
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"Setter",
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(node) ? node.id || node.tagName : "",
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idCounter++
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].join("_");
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}
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},
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set: function(/* String|DomNode|NodeList? */ cont, /* Object? */ params){
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// summary:
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// front-end to the set-content sequence
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// cont:
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// An html string, node or enumerable list of nodes for insertion into the dom
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// If not provided, the object's content property will be used
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if(undefined !== cont){
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this.content = cont;
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}
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// in the re-use scenario, set needs to be able to mixin new configuration
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if(params){
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this._mixin(params);
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}
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this.onBegin();
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this.setContent();
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this.onEnd();
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return this.node;
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},
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setContent: function(){
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// summary:
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// sets the content on the node
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var node = this.node;
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if(!node) {
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// can't proceed
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throw new Error(this.declaredClass + ": setContent given no node");
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}
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try{
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node = dojo.html._setNodeContent(node, this.content);
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}catch(e){
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// check if a domfault occurs when we are appending this.errorMessage
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// like for instance if domNode is a UL and we try append a DIV
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// FIXME: need to allow the user to provide a content error message string
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var errMess = this.onContentError(e);
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try{
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node.innerHTML = errMess;
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}catch(e){
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console.error('Fatal ' + this.declaredClass + '.setContent could not change content due to '+e.message, e);
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}
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}
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// always put back the node for the next method
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this.node = node; // DomNode
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},
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empty: function() {
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// summary
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// cleanly empty out existing content
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// destroy any widgets from a previous run
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// NOTE: if you dont want this you'll need to empty
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// the parseResults array property yourself to avoid bad things happenning
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if(this.parseResults && this.parseResults.length) {
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dojo.forEach(this.parseResults, function(w) {
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if(w.destroy){
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w.destroy();
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}
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});
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delete this.parseResults;
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}
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// this is fast, but if you know its already empty or safe, you could
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// override empty to skip this step
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dojo.html._emptyNode(this.node);
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},
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onBegin: function(){
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// summary
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// Called after instantiation, but before set();
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// It allows modification of any of the object properties
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// - including the node and content provided - before the set operation actually takes place
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// This default implementation checks for cleanContent and extractContent flags to
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// optionally pre-process html string content
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var cont = this.content;
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if(dojo.isString(cont)){
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if(this.cleanContent){
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cont = dojo.html._secureForInnerHtml(cont);
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}
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if(this.extractContent){
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var match = cont.match(/<body[^>]*>\s*([\s\S]+)\s*<\/body>/im);
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if(match){ cont = match[1]; }
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}
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}
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// clean out the node and any cruft associated with it - like widgets
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this.empty();
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this.content = cont;
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return this.node; /* DomNode */
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},
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onEnd: function(){
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// summary
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// Called after set(), when the new content has been pushed into the node
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// It provides an opportunity for post-processing before handing back the node to the caller
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// This default implementation checks a parseContent flag to optionally run the dojo parser over the new content
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if(this.parseContent){
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// populates this.parseResults if you need those..
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this._parse();
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}
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return this.node; /* DomNode */
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},
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tearDown: function(){
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// summary
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// manually reset the Setter instance if its being re-used for example for another set()
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// description
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// tearDown() is not called automatically.
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// In normal use, the Setter instance properties are simply allowed to fall out of scope
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// but the tearDown method can be called to explicitly reset this instance.
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delete this.parseResults;
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delete this.node;
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delete this.content;
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},
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onContentError: function(err){
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return "Error occured setting content: " + err;
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},
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_mixin: function(params){
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// mix properties/methods into the instance
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// TODO: the intention with tearDown is to put the Setter's state
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// back to that of the original constructor (vs. deleting/resetting everything regardless of ctor params)
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// so we could do something here to move the original properties aside for later restoration
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var empty = {}, key;
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for(key in params){
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if(key in empty){ continue; }
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// TODO: here's our opportunity to mask the properties we dont consider configurable/overridable
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// .. but history shows we'll almost always guess wrong
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this[key] = params[key];
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}
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},
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_parse: function(){
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// summary:
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// runs the dojo parser over the node contents, storing any results in this.parseResults
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// Any errors resulting from parsing are passed to _onError for handling
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var rootNode = this.node;
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try{
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// store the results (widgets, whatever) for potential retrieval
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this.parseResults = dojo.parser.parse({
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rootNode: rootNode,
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dir: this.dir,
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lang: this.lang
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});
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}catch(e){
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this._onError('Content', e, "Error parsing in _ContentSetter#"+this.id);
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}
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},
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_onError: function(type, err, consoleText){
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// summary:
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// shows user the string that is returned by on[type]Error
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// overide/implement on[type]Error and return your own string to customize
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var errText = this['on' + type + 'Error'].call(this, err);
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if(consoleText){
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console.error(consoleText, err);
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}else if(errText){ // a empty string won't change current content
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dojo.html._setNodeContent(this.node, errText, true);
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}
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}
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}); // end dojo.declare()
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dojo.html.set = function(/* DomNode */ node, /* String|DomNode|NodeList */ cont, /* Object? */ params){
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// summary:
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// inserts (replaces) the given content into the given node. dojo.place(cont, node, "only")
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// may be a better choice for simple HTML insertion.
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// description:
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// Unless you need to use the params capabilities of this method, you should use
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// dojo.place(cont, node, "only"). dojo.place() has more robust support for injecting
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// an HTML string into the DOM, but it only handles inserting an HTML string as DOM
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// elements, or inserting a DOM node. dojo.place does not handle NodeList insertions
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// or the other capabilities as defined by the params object for this method.
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// node:
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// the parent element that will receive the content
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// cont:
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// the content to be set on the parent element.
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// This can be an html string, a node reference or a NodeList, dojo.NodeList, Array or other enumerable list of nodes
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// params:
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// Optional flags/properties to configure the content-setting. See dojo.html._ContentSetter
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// example:
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// A safe string/node/nodelist content replacement/injection with hooks for extension
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// Example Usage:
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// dojo.html.set(node, "some string");
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// dojo.html.set(node, contentNode, {options});
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// dojo.html.set(node, myNode.childNodes, {options});
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if(undefined == cont){
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console.warn("dojo.html.set: no cont argument provided, using empty string");
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cont = "";
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}
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if(!params){
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// simple and fast
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return dojo.html._setNodeContent(node, cont, true);
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}else{
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// more options but slower
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// note the arguments are reversed in order, to match the convention for instantiation via the parser
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var op = new dojo.html._ContentSetter(dojo.mixin(
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params,
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{ content: cont, node: node }
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));
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return op.set();
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}
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};
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})();
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}
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