ZhuJiaHao
/
zdqy_firm_former


			
				
					
						
						
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							<!DOCTYPE html>
<html>
<head>
<title>Dynamic Preview of Textarea with MathJax Content</title>
<!-- Copyright (c) 2012-2018 The MathJax Consortium -->
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />

<style>
.changed { color: red }
</style>

<script type="text/x-mathjax-config">
  MathJax.Hub.Config({
    TeX: {
      equationNumbers: {autoNumber: "AMS"},
      extensions: ["begingroup.js"],
      noErrors: {disabled: true}
    },
    showProcessingMessages: false,
    tex2jax: { inlineMath: [['$','$'],['\\(','\\)']] }
  });
</script>
<script type="text/javascript" src="../MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>

<script>
var Preview = {
  typeset: null,     // the typeset preview area (filled in by Init below)
  preview: null,     // the untypeset preview    (filled in by Init below)
  buffer: null,      // the new preview to be typeset (filled in by Init below)
  numbers: [],       // the equation numbers per paragraph
  labels: [],        // the equation labels per paragraph
  defs: [],          // the definitions per paragraph

  oldtext: '',       // used to see if an update is needed
  pending: false,    // true when a restart is in the MathJax queue

  colorDelay: 400,   // how long to leave changed paragraphs colored
  ctimeout: null,    // timeout for changed style remover
  labelDelay: 1250,  // how long to wait before reprocessing for label changes
  ltimeout: null,    // timeout for changed labels

  //
  //  Get the preview and buffer DIV's
  //
  Init: function () {
    this.typeset = document.getElementById("MathPreview");
    this.buffer = document.createElement("div");
    this.preview = document.createElement("div");
  },

  //
  //  This gets called when a key is pressed in the textarea.
  //
  Update: function () {
    var text = document.getElementById("MathInput").value;
    text = text.replace(/^\s+/,'').replace(/\s+$/,'');
    if (text !== this.oldtext) {
      this.oldtext = text;
      if (!this.pending) {
        this.pending = true;
        MathJax.Hub.Queue(["Restart",this]);
      }
    }
  },

  Restart: function (from) {
    this.pending = false;
    var text = this.oldtext.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
    var text = "<p>"+text.replace(/\n\n+/g,"</p><p>")+"</p>";
//    var text = text.replace(/\n\n+/g,"<p>");
    this.buffer.innerHTML = text;
    if (this.ctimeout) {clearTimeout(this.ctimeout); this.ctimeout = null}
    if (this.ltimeout) {clearTimeout(this.ltimeout); this.ltimeout = null}
    var update = this.CompareBuffers(from);
    if (update.needed) {
      MathJax.Hub.Queue(
        ["PreTypeset",this,update],
        ["Typeset",this,update],
        ["PostTypeset",this,update]
      );
    }
  },

  CompareBuffers: function (from) {
    var b1 = this.buffer.childNodes,
        b2 = this.preview.childNodes,
        i, m1 = b1.length, m2 = b2.length;
    //
    //  Make sure all top-level elements are containers
    //
    for (i = 0; i < m1; i++) {
      var node = b1[i];
      if (typeof(node.innerHTML) === "undefined") {
        this.buffer.replaceChild(document.createElement("span"),node);
        b1[i].appendChild(node);
      }
    }
    //
    //  Determine the range of elements to update
    //
    if (from != null) {
      //
      //  If from a starting point to the end, return the proper range
      //
      i = from; m1--; m2--;
    } else {
      //
      //  Find first non-matching element, if any,
      //    and the last non-matching element
      //
      m = Math.min(m1,m2);
      for (i = 0; i < m; i++) {if (b1[i].innerHTML !== b2[i].innerHTML) break}
      if (i === m && m1 === m2) {return {needed: false}}
      while (m1 > i && m2 > i) {if (b1[--m1].innerHTML !== b2[--m2].innerHTML) break}
    }
    return {needed:true, start:i, end1:m1, end2:m2};
  },

  Typeset: function (update) {
    return MathJax.Hub.Typeset(update.nodes);
  },

  PreTypeset: function (update) {
    var TEX = MathJax.InputJax.TeX;
    var i, m, n = 0, defs = [], m1 = update.end1, m2 = update.end2;
    var b1 = this.buffer.childNodes,
        b2 = this.typeset.childNodes;
    //
    //  Remove the change color, if any
    //
    if (this.changed) {this.Unmark()}

    //
    //  Determine the starting equation number
    //
    for (i = 0, m = update.start; i < m; i++) {
      n += this.numbers[i];
      defs = defs.concat(this.defs[i]);
    }
    TEX.resetEquationNumbers(n,true);
    //
    //  Pop any left over \begingroups and push a new one
    //  Then define any macros from previous paragraphs
    //
    while (TEX.rootStack.top > 1) {TEX.rootStack.stack.pop(); TEX.rootStack.top--}
    TEX.rootStack.Push(TEX.nsStack.nsFrame());
    for (i = 0, m = defs.length; i < m; i++) {TEX.rootStack.Def.apply(TEX.rootStack,defs[i])}
    i = this.i = update.start; this.refs = []; this.defs.all = [];

    //
    //  Remove differing elements from typeset copy
    //  and add in the new (untypeset) elements.
    //
    m = m2+1; update.nodes = [];
    var tail = b2[m];
    this.recordNumbers(this.numbers.splice(i,m-i),n);
    this.recordLabels(this.labels.splice(i,m-i));
    this.recordDefs(this.defs.splice(i,m-i));
    while (m2 >= i && b2[i]) {this.typeset.removeChild(b2[i]); m2--}
    while (i <= m1 && b1[i]) {
      this.numbers.splice(i,0,0); this.labels.splice(i,0,[]); this.defs.splice(i,0,[]);
      var node = b1[i].cloneNode(true); update.nodes.push(node);
      this.typeset.insertBefore(node,tail); i++;
      if (node.className && node.className != "")
        {node.className += " changed"} else {node.className = "changed"}
    }
    //
    //  Swap buffers and set up the new buffer for the next change
    //
    this.preview = this.buffer; this.buffer = document.createElement("div");
    this.incremental = true;
  },

  recordNumbers: function (numbers,top) {
    this.oldtop = this.newtop = top;
    for (var i = 0, m = numbers.length; i < m; i++) {this.oldtop += numbers[i]}
  },
  recordLabels: function (labels) {
    var AMS = MathJax.Extension["TeX/AMSmath"];
    this.oldlabels = labels.join(''); this.newlabels = [];
    if (labels && labels.length) {
      for (var i = 0, m = labels.length; i < m; i++) {
        for (var j = 0, n = labels[i].length; j < n; j++) {
          delete AMS.labels[labels[i][j].split(/=/)[0]];
        }
      }
    }
  },
  recordDefs: function (defs) {
    var all = [];
    for (var i = 0, m = defs.length; i < m; i++) {all.push(defs[i].all)}
    this.defs.old = all.join(",");
  },

  PostTypeset: function (update) {
    var incremental = this.incremental; this.incremental = false;
    if (incremental && this.refs.length) {
      var refs = this.refs; this.refs = [];
      var queue = MathJax.Callback.Queue(["Reprocess",MathJax.Hub,refs,{}]);
      return queue.Push(["PostTypeset",this,update]);
    }
    this.changed = update.nodes; this.ctimeout = setTimeout(this.Unmark,this.colorDelay);
    if (update.nodes.length !== this.preview.childNodes.length) {
      //  ###  Make delay be dynamic based on number of equations?  ###
      if (this.needsRefresh || this.newlabels && this.newlabels.join('') !== this.oldlabels) {
        this.needsRefresh = true;
        this.ltimeout = setTimeout(this.Refresh,this.labelDelay);
      } else {
        if (this.newtop != this.oldtop || this.defs.all.join("") !== this.defs.old) {
          if (this.needsRenumber == null) {this.needsRenumber = this.i}
          else {this.needsRenumber = Math.min(this.needsRenumber,this.i)}
        }
        if (this.needsRenumber != null)
          {this.ltimeout = setTimeout(this.Renumber,this.labelDelay)}
      }
    }
  },
  Unmark: function () {
    var nodes = Preview.changed; Preview.changed = Preview.ctimeout = null;
    for (var i = 0, m = nodes.length; i < m; i++) {Preview.removeChanged(nodes[i])}
  },
  Refresh: function () {
    Preview.pending = true; Preview.needsRefresh = false; delete Preview.needsRenumber;
    MathJax.Hub.Queue(["Restart",Preview,0]);
  },
  Renumber: function () {
    if (Preview.needsRenumber < Preview.preview.childNodes.length) {
      var n = Preview.needsRenumber;
      Preview.pending = true; delete Preview.needsRenumber;
      MathJax.Hub.Queue(["Restart",Preview,n]);
    }
  },

  //
  //  Remove the "changed" class from an element (leaving all other classes)
  //
  removeChanged: function (node) {
    if (node.className) {
      node.className = node.className.toString()
                           .replace(/(^|\s+)changed(\s|$)/,"$2")
                           .replace(/^\s+/,"");
    }
  }

};

MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
  MathJax.InputJax.TeX.postfilterHooks.Add(function (data) {
    if (Preview.incremental) {
      var AMS = MathJax.Extension["TeX/AMSmath"];
      var labels = Preview.labels[Preview.i];
      for (var id in AMS.eqlabels) {if (AMS.eqlabels.hasOwnProperty(id)) {
        labels.push(id+"="+AMS.eqlabels[id])
      }}
      Preview.newlabels = Preview.newlabels.concat(labels);
    }
  });
});
MathJax.Hub.Register.MessageHook("Begin Math Input",function () {
  if (Preview.incremental) {Preview.eqDefs = []; Preview.eqDefs.all = []}
});
MathJax.Hub.Register.MessageHook("End Math Input",function () {
  if (Preview.incremental) {
    var AMS = MathJax.Extension["TeX/AMSmath"];
    Preview.refs = Preview.refs.concat(AMS.refs); AMS.refs = [];
    Preview.eqDefs.all = Preview.eqDefs.all.join("");
    Preview.defs[Preview.i] = Preview.eqDefs;
    Preview.defs.all.push(Preview.defs[Preview.i].all);
    Preview.numbers[Preview.i] = AMS.startNumber - Preview.newtop;
    Preview.newtop = AMS.startNumber;
    Preview.i++;
  }
},5); // priority = 5 to make sure it is before AMS runs.

MathJax.Hub.Register.StartupHook("TeX begingroup Ready",function () {
  var STACK = MathJax.InputJax.TeX.eqnStack;
  var DEF = STACK.Def;
  STACK.Def = function () {
    if (Preview.incremental) {
      Preview.eqDefs.push([].slice.call(arguments,0));
      Preview.eqDefs.all.push(arguments[0]+"{"+arguments[1]+"}");
    }
    DEF.apply(this,arguments);
  }
  //
  //  Temporary hack to fix typo in begingroup.js
  //
  MathJax.InputJax.TeX.rootStack.stack[0].environments =
    MathJax.InputJax.TeX.Definitions.environment;
});

</script>
</head>
<body>

Type text with embedded TeX in the box below:<br/>

<textarea id="MathInput" cols="60" rows="10" onkeyup="Preview.Update()" onkeydown="Preview.Update()" style="margin-top:5px">
</textarea>
<br/><br/>
Preview is shown here:
<div id="MathPreview" style="border:1px solid; padding: 3px; width:50%; margin-top:5px"></div>

<script>
Preview.Init();
</script>

</body>
</html>