ZhuJiaHao
/
zdqy_firm_former


			
				
					
						
						
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							<!DOCTYPE html>
<html>
<head>
<title>Dynamic Equation List</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" />

<script type="text/x-mathjax-config">
MathJax.Hub.Config({
  tex2jax: { inlineMath: [['$','$']] }
});
</script>
<script src="../MathJax/MathJax.js?config=TeX-AMS_HTML"></script>

<script>
var Equation = {
  //
  // onclick and onchange routines for buttons and type-in areas
  // (avoids creating new closures for each button)
  //
  addEqn: function () {Equation.Add(this)},
  removeEqn: function () {Equation.Remove(this)},
  updateEqn: function () {Equation.Update(this)},

  //
  //  Add a new equation prior to the one where the plus button was pressed
  //    Create a new equation DIV with +, -, tex, and typeset areas
  //    Insert it into the list of equations at the right spot
  //    Typeset it and show the results (the math is initially hidden to avoid flicker)
  //
  Add: function (input) {
    var div = input.parentNode;
    var eqn = MathJax.HTML.Element("div",{},[
      ["input",{type:"button",value:"+",onclick:this.addEqn}],
      ["input",{type:"button",value:"-",onclick:this.removeEqn}]," ",
      ["input",{type:"text",size:"40",onchange:this.updateEqn,style:{"margin-right":"5em"}}],
      ["span",{style:{visibility:"hidden"}},["${}$"]]
    ]);
    div.parentNode.insertBefore(eqn,div);
    MathJax.Hub.Queue(
      ["Typeset",MathJax.Hub,eqn],
      ["Show",this,eqn]
    );
  },

  //
  //  Remove the equation and its buttons and typset form
  //
  Remove: function (input) {
    var eqn = input.parentNode;
    eqn.parentNode.removeChild(eqn);
  },

  //
  //  Get the element jax for the associated equation,
  //    hide the math, set its text and typeset it, then show it again
  //
  Update: function (input) {
    var eqn = input.parentNode;
    var math = MathJax.Hub.getAllJax(eqn)[0];
    MathJax.Hub.Queue(
      ["Hide",this,eqn],
      ["Text",math,input.value],
      ["Show",this,eqn]
    );
  },

  //
  //  Hide and show math (during typesetting, so you don't see the initial TeX code)
  //
  Hide: function (eqn) {eqn.lastChild.style.visibility = "hidden"},
  Show: function (eqn) {eqn.lastChild.style.visibility = ""}
}
</script>

</head>
<body>

<div id="eqn_list">
<div><input type="button" value="+" onclick="Equation.Add(this)" id="add"/></div>
</div>

<script>
Equation.Add(document.getElementById("add"));  // Create initial equation
</script>

</body>
</html>