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311 lines
10 KiB
311 lines
10 KiB
5 years ago
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<!DOCTYPE html>
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<html>
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<head>
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<title>Dynamic Preview of Textarea with MathJax Content</title>
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<!-- Copyright (c) 2012-2018 The MathJax Consortium -->
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<style>
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.changed { color: red }
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</style>
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<script type="text/x-mathjax-config">
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MathJax.Hub.Config({
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TeX: {
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equationNumbers: {autoNumber: "AMS"},
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extensions: ["begingroup.js"],
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noErrors: {disabled: true}
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},
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showProcessingMessages: false,
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tex2jax: { inlineMath: [['$','$'],['\\(','\\)']] }
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});
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</script>
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<script type="text/javascript" src="../MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
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<script>
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var Preview = {
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typeset: null, // the typeset preview area (filled in by Init below)
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preview: null, // the untypeset preview (filled in by Init below)
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buffer: null, // the new preview to be typeset (filled in by Init below)
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numbers: [], // the equation numbers per paragraph
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labels: [], // the equation labels per paragraph
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defs: [], // the definitions per paragraph
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oldtext: '', // used to see if an update is needed
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pending: false, // true when a restart is in the MathJax queue
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colorDelay: 400, // how long to leave changed paragraphs colored
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ctimeout: null, // timeout for changed style remover
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labelDelay: 1250, // how long to wait before reprocessing for label changes
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ltimeout: null, // timeout for changed labels
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//
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// Get the preview and buffer DIV's
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//
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Init: function () {
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this.typeset = document.getElementById("MathPreview");
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this.buffer = document.createElement("div");
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this.preview = document.createElement("div");
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},
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//
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// This gets called when a key is pressed in the textarea.
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//
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Update: function () {
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var text = document.getElementById("MathInput").value;
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text = text.replace(/^\s+/,'').replace(/\s+$/,'');
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if (text !== this.oldtext) {
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this.oldtext = text;
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if (!this.pending) {
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this.pending = true;
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MathJax.Hub.Queue(["Restart",this]);
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}
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}
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},
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Restart: function (from) {
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this.pending = false;
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var text = this.oldtext.replace(/&/g,'&').replace(/</g,'<').replace(/>/g,'>');
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var text = "<p>"+text.replace(/\n\n+/g,"</p><p>")+"</p>";
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// var text = text.replace(/\n\n+/g,"<p>");
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this.buffer.innerHTML = text;
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if (this.ctimeout) {clearTimeout(this.ctimeout); this.ctimeout = null}
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if (this.ltimeout) {clearTimeout(this.ltimeout); this.ltimeout = null}
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var update = this.CompareBuffers(from);
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if (update.needed) {
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MathJax.Hub.Queue(
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["PreTypeset",this,update],
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["Typeset",this,update],
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["PostTypeset",this,update]
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);
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}
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},
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CompareBuffers: function (from) {
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var b1 = this.buffer.childNodes,
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b2 = this.preview.childNodes,
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i, m1 = b1.length, m2 = b2.length;
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//
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// Make sure all top-level elements are containers
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//
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for (i = 0; i < m1; i++) {
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var node = b1[i];
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if (typeof(node.innerHTML) === "undefined") {
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this.buffer.replaceChild(document.createElement("span"),node);
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b1[i].appendChild(node);
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}
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}
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//
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// Determine the range of elements to update
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//
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if (from != null) {
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//
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// If from a starting point to the end, return the proper range
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//
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i = from; m1--; m2--;
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} else {
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//
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// Find first non-matching element, if any,
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// and the last non-matching element
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//
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m = Math.min(m1,m2);
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for (i = 0; i < m; i++) {if (b1[i].innerHTML !== b2[i].innerHTML) break}
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if (i === m && m1 === m2) {return {needed: false}}
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while (m1 > i && m2 > i) {if (b1[--m1].innerHTML !== b2[--m2].innerHTML) break}
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}
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return {needed:true, start:i, end1:m1, end2:m2};
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},
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Typeset: function (update) {
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return MathJax.Hub.Typeset(update.nodes);
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},
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PreTypeset: function (update) {
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var TEX = MathJax.InputJax.TeX;
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var i, m, n = 0, defs = [], m1 = update.end1, m2 = update.end2;
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var b1 = this.buffer.childNodes,
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b2 = this.typeset.childNodes;
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//
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// Remove the change color, if any
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//
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if (this.changed) {this.Unmark()}
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//
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// Determine the starting equation number
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//
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for (i = 0, m = update.start; i < m; i++) {
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n += this.numbers[i];
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defs = defs.concat(this.defs[i]);
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}
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TEX.resetEquationNumbers(n,true);
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//
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// Pop any left over \begingroups and push a new one
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// Then define any macros from previous paragraphs
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//
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while (TEX.rootStack.top > 1) {TEX.rootStack.stack.pop(); TEX.rootStack.top--}
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TEX.rootStack.Push(TEX.nsStack.nsFrame());
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for (i = 0, m = defs.length; i < m; i++) {TEX.rootStack.Def.apply(TEX.rootStack,defs[i])}
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i = this.i = update.start; this.refs = []; this.defs.all = [];
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//
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// Remove differing elements from typeset copy
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// and add in the new (untypeset) elements.
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//
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m = m2+1; update.nodes = [];
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var tail = b2[m];
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this.recordNumbers(this.numbers.splice(i,m-i),n);
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this.recordLabels(this.labels.splice(i,m-i));
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this.recordDefs(this.defs.splice(i,m-i));
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while (m2 >= i && b2[i]) {this.typeset.removeChild(b2[i]); m2--}
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while (i <= m1 && b1[i]) {
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this.numbers.splice(i,0,0); this.labels.splice(i,0,[]); this.defs.splice(i,0,[]);
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var node = b1[i].cloneNode(true); update.nodes.push(node);
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this.typeset.insertBefore(node,tail); i++;
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if (node.className && node.className != "")
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{node.className += " changed"} else {node.className = "changed"}
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}
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//
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// Swap buffers and set up the new buffer for the next change
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//
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this.preview = this.buffer; this.buffer = document.createElement("div");
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this.incremental = true;
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},
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recordNumbers: function (numbers,top) {
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this.oldtop = this.newtop = top;
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for (var i = 0, m = numbers.length; i < m; i++) {this.oldtop += numbers[i]}
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},
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recordLabels: function (labels) {
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var AMS = MathJax.Extension["TeX/AMSmath"];
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this.oldlabels = labels.join(''); this.newlabels = [];
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if (labels && labels.length) {
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for (var i = 0, m = labels.length; i < m; i++) {
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for (var j = 0, n = labels[i].length; j < n; j++) {
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delete AMS.labels[labels[i][j].split(/=/)[0]];
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}
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}
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}
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},
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recordDefs: function (defs) {
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var all = [];
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for (var i = 0, m = defs.length; i < m; i++) {all.push(defs[i].all)}
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this.defs.old = all.join(",");
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},
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PostTypeset: function (update) {
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var incremental = this.incremental; this.incremental = false;
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if (incremental && this.refs.length) {
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var refs = this.refs; this.refs = [];
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var queue = MathJax.Callback.Queue(["Reprocess",MathJax.Hub,refs,{}]);
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return queue.Push(["PostTypeset",this,update]);
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}
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this.changed = update.nodes; this.ctimeout = setTimeout(this.Unmark,this.colorDelay);
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if (update.nodes.length !== this.preview.childNodes.length) {
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// ### Make delay be dynamic based on number of equations? ###
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if (this.needsRefresh || this.newlabels && this.newlabels.join('') !== this.oldlabels) {
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this.needsRefresh = true;
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this.ltimeout = setTimeout(this.Refresh,this.labelDelay);
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} else {
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if (this.newtop != this.oldtop || this.defs.all.join("") !== this.defs.old) {
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if (this.needsRenumber == null) {this.needsRenumber = this.i}
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else {this.needsRenumber = Math.min(this.needsRenumber,this.i)}
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}
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if (this.needsRenumber != null)
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{this.ltimeout = setTimeout(this.Renumber,this.labelDelay)}
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}
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}
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},
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Unmark: function () {
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var nodes = Preview.changed; Preview.changed = Preview.ctimeout = null;
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for (var i = 0, m = nodes.length; i < m; i++) {Preview.removeChanged(nodes[i])}
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},
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Refresh: function () {
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Preview.pending = true; Preview.needsRefresh = false; delete Preview.needsRenumber;
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MathJax.Hub.Queue(["Restart",Preview,0]);
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},
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Renumber: function () {
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if (Preview.needsRenumber < Preview.preview.childNodes.length) {
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var n = Preview.needsRenumber;
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Preview.pending = true; delete Preview.needsRenumber;
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MathJax.Hub.Queue(["Restart",Preview,n]);
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}
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},
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//
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// Remove the "changed" class from an element (leaving all other classes)
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//
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removeChanged: function (node) {
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if (node.className) {
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node.className = node.className.toString()
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.replace(/(^|\s+)changed(\s|$)/,"$2")
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.replace(/^\s+/,"");
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}
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}
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};
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MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
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MathJax.InputJax.TeX.postfilterHooks.Add(function (data) {
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if (Preview.incremental) {
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var AMS = MathJax.Extension["TeX/AMSmath"];
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var labels = Preview.labels[Preview.i];
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for (var id in AMS.eqlabels) {if (AMS.eqlabels.hasOwnProperty(id)) {
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labels.push(id+"="+AMS.eqlabels[id])
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}}
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Preview.newlabels = Preview.newlabels.concat(labels);
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}
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});
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});
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MathJax.Hub.Register.MessageHook("Begin Math Input",function () {
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if (Preview.incremental) {Preview.eqDefs = []; Preview.eqDefs.all = []}
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});
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MathJax.Hub.Register.MessageHook("End Math Input",function () {
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if (Preview.incremental) {
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var AMS = MathJax.Extension["TeX/AMSmath"];
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Preview.refs = Preview.refs.concat(AMS.refs); AMS.refs = [];
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Preview.eqDefs.all = Preview.eqDefs.all.join("");
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Preview.defs[Preview.i] = Preview.eqDefs;
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Preview.defs.all.push(Preview.defs[Preview.i].all);
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Preview.numbers[Preview.i] = AMS.startNumber - Preview.newtop;
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Preview.newtop = AMS.startNumber;
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Preview.i++;
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}
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},5); // priority = 5 to make sure it is before AMS runs.
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MathJax.Hub.Register.StartupHook("TeX begingroup Ready",function () {
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var STACK = MathJax.InputJax.TeX.eqnStack;
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var DEF = STACK.Def;
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STACK.Def = function () {
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if (Preview.incremental) {
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Preview.eqDefs.push([].slice.call(arguments,0));
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Preview.eqDefs.all.push(arguments[0]+"{"+arguments[1]+"}");
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}
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DEF.apply(this,arguments);
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}
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//
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// Temporary hack to fix typo in begingroup.js
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//
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MathJax.InputJax.TeX.rootStack.stack[0].environments =
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MathJax.InputJax.TeX.Definitions.environment;
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});
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</script>
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</head>
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<body>
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Type text with embedded TeX in the box below:<br/>
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<textarea id="MathInput" cols="60" rows="10" onkeyup="Preview.Update()" onkeydown="Preview.Update()" style="margin-top:5px">
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</textarea>
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<br/><br/>
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Preview is shown here:
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<div id="MathPreview" style="border:1px solid; padding: 3px; width:50%; margin-top:5px"></div>
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<script>
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Preview.Init();
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</script>
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</body>
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</html>
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