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88 lines
2.3 KiB
88 lines
2.3 KiB
;(function(undefined) {
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'use strict';
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if (typeof sigma === 'undefined')
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throw 'sigma is not declared';
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// Initialize package:
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sigma.utils.pkg('sigma.parsers');
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sigma.utils.pkg('sigma.utils');
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/**
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* Just an XmlHttpRequest polyfill for different IE versions.
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*
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* @return {*} The XHR like object.
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*/
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sigma.utils.xhr = function() {
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if (window.XMLHttpRequest)
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return new XMLHttpRequest();
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var names,
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i;
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if (window.ActiveXObject) {
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names = [
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'Msxml2.XMLHTTP.6.0',
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'Msxml2.XMLHTTP.3.0',
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'Msxml2.XMLHTTP',
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'Microsoft.XMLHTTP'
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];
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for (i in names)
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try {
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return new ActiveXObject(names[i]);
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} catch (e) {}
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}
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return null;
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};
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/**
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* This function loads a JSON file and creates a new sigma instance or
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* updates the graph of a given instance. It is possible to give a callback
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* that will be executed at the end of the process.
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*
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* @param {string} url The URL of the JSON file.
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* @param {object|sigma} sig A sigma configuration object or a sigma
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* instance.
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* @param {?function} callback Eventually a callback to execute after
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* having parsed the file. It will be called
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* with the related sigma instance as
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* parameter.
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*/
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sigma.parsers.json = function(url, sig, callback) {
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var graph,
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xhr = sigma.utils.xhr();
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if (!xhr)
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throw 'XMLHttpRequest not supported, cannot load the file.';
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xhr.open('GET', url, true);
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xhr.onreadystatechange = function() {
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if (xhr.readyState === 4) {
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graph = JSON.parse(xhr.responseText);
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// Update the instance's graph:
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if (sig instanceof sigma) {
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sig.graph.clear();
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sig.graph.read(graph);
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// ...or instantiate sigma if needed:
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} else if (typeof sig === 'object') {
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sig.graph = graph;
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sig = new sigma(sig);
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// ...or it's finally the callback:
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} else if (typeof sig === 'function') {
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callback = sig;
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sig = null;
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}
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// Call the callback if specified:
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if (callback)
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callback(sig || graph);
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}
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};
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xhr.send();
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};
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}).call(this);
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