Of Stack

Three level linkage effect realized by pure js three dimensional array

  • 2021-07-18 06:34:55
  • OfStack

In this paper, we share the specific code of Android9 palace picture display for your reference. The specific contents are as follows 


<!DOCTYPE html> 
<html> 
<head lang="en"> 
  <meta charset="UTF-8"> 
  <title></title> 
</head> 
<body> 
<p>3 Level linkage effect (pure JS Implementation) </p> 
<div> 
   Professional direction:  <select name="sel1" id="sel1"> 
  <option>-- Please choose a major --</option> 
  <option>JAVA</option><option>PHP</option><option>UI</option> 
  </select> 
</div> 
<div> 
   Class name:  <select name="sel2" id="sel2"> 
  <option>-- Please select a class --</option> 
</select> 
</div> 
<div> 
   Student name:  <select name="sel3" id="sel3"> 
  <option>-- Please select a student --</option> 
</select> 
</div> 
<p> 
   Your selection is:  <span id="sptext"></span> 
</p> 
<script> 
  var myclass = [ 
      [['JAVA Class 01'],['JAVA Class 02'],['JAVA Class 03']], 
      [['PHP Class 01'],['PHP Class 02'],['PHP Class 03']], 
      [['UI Class 01'],['UI Class 02'],['UI Class 03']] 
  ]; 
  var mystudy= [ 
    [ // No. 1 1 Dimension represents specialty   ,   No. 1 2 Dimension represents the class of this major   , No. 3 Dimension represents the students in this class  
      [['JAVA Class 01 Students 01'],['JAVA Class 01 Students 02'],['JAVA Class 01 Students 03'],['JAVA Class 01 Students 04']], 
      [['JAVA Class 02 Students 01'],['JAVA Class 02 Students 02'],['JAVA Class 02 Students 03'],['JAVA Class 02 Students 04']], 
      [['JAVA Class 03 Students 01'],['JAVA Class 03 Students 02'],['JAVA Class 03 Students 03'],['JAVA Class 03 Students 04']] 
    ], 
    [ 
      [['PHP Class 01 Students 01'],['PHP Class 01 Students 02'],['PHP Class 01 Students 03'],['PHP Class 01 Students 04']], 
      [['PHP Class 02 Students 01'],['PHP Class 02 Students 02'],['PHP Class 02 Students 03'],['PHP Class 02 Students 04']], 
      [['PHP Class 03 Students 01'],['PHP Class 03 Students 02'],['PHP Class 03 Students 03'],['PHP Class 03 Students 04']] 
    ], 
    [ 
      [['UI Class 01 Students 01'],['UI Class 01 Students 02'],['UI Class 01 Students 03'],['UI Class 01 Students 04']], 
      [['UI Class 02 Students 01'],['UI Class 02 Students 02'],['UI Class 02 Students 03'],['UI Class 02 Students 04']], 
      [['UI Class 03 Students 01'],['UI Class 03 Students 02'],['UI Class 03 Students 03'],['UI Class 03 Students 04']] 
    ] 
  ]; 
document.getElementById("sel1").onchange = function(){ 
  // Gets the index value of the selected option from the 1 Started, did not return -1 )  
  var selectNum = this.selectedIndex; 
  // Empty the original option  
  document.getElementById("sel2").length=1; 
  document.getElementById("sel3").length=1; 
  // Loop to add child nodes  
  for(var i=0;i<myclass[selectNum-1].length;i++){ 
    // Create Element Node  
    var node =document.createElement("OPTION"); 
    // Create a text node  
    var text = document.createTextNode(myclass[selectNum-1][i]); 
     node.appendChild(text); 
    document.getElementById("sel2").appendChild(node); 
  } 
}; 
  document.getElementById("sel2").onchange = function(){ 
    document.getElementById("sel3").length=1; 
    var selectStudentNum = this.selectedIndex; 
    var selectClassNum = document.getElementById("sel1").selectedIndex; 
    for(var i=0;i<mystudy[selectClassNum-1][selectStudentNum-1].length;i++){ 
      var node =document.createElement("OPTION"); 
      var text = document.createTextNode(mystudy[selectClassNum-1][selectStudentNum-1][i]); 
      node.appendChild(text); 
      document.getElementById("sel3").appendChild(node); 
    } 
  } 
</script> 
</body> 
</html>
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