How to display array items when index values are entered in input in html

Question

I have created javascript function to display array items when index values are entered in input box but it is not working but i want to do it through forloop

<html>
<head>
<title>ForLoop</title>
</head>
<body>
<input id="answer"/><br/><br/>
<button id="btn">Generate</button><br/><br/>
<h1 id="ans"></h1>
<script>
var MyArray=["Lion","Mouse","Cat","Dog","Buffalo","Cow","Rat","Tiger","Monkey","Lepoard","Lizard"]
for(var i=0; i<MyArray.length;i++){
document.getElementById("btn").onclick=function(){
if( document.getElementById("answer").value==MyArray[i]){
document.getElementById("ans").innerHTML=MyArray[i]
}
}


}

</script>
</body>
</html>

brk · Accepted Answer · 2016-06-23 13:46:20Z

3

There are couple of issues.

You are attaching the event listener inside for-loop. Infact there is no need of for -loop;
You need to do same document.getElementById('ans') .innerHTML to update ans DOM element.

Hope this snippet and demo will be useful

var MyArray=["Lion","Mouse","Cat","Dog","Buffalo","Cow","Rat","Tiger","Monkey","Lepoard","Lizard"]
document.getElementById("btn").onclick=function(){
var _ip =document.getElementById("answer").value;
document.getElementById("display").innerHTML=MyArray[_ip];
}

JSFIDDLE

answered Jun 23, 2016 at 13:46

brk

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Comments

Rayon · Accepted Answer · 2016-06-23 14:12:31Z

2

Use value as index of array

The unary plus operator precedes its operand and evaluates to its operand but attempts to converts it into a number, if it isn't already.

The Node.textContent property represents(gets/sets) the text content of a node and its descendants.

Consider following scenarios as well:

If value is empty('')
If provided index does exist in array

var MyArray = ["Lion", "Mouse", "Cat", "Dog", "Buffalo", "Cow", "Rat", "Tiger", "Monkey", "Lepoard", "Lizard"];
document.getElementById("btn").onclick = function() {
  var ans = document.getElementById('answer').value;
  document.getElementById("ans").textContent = (ans === '') ? '' : MyArray[+ans] || '';
}

<input id="answer" />
<br/>
<br/>
<button id="btn">Generate</button>
<br/>
<br/>
<h1 id="ans"></h1>

edited Jun 23, 2016 at 14:12

answered Jun 23, 2016 at 13:43

Rayon

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Comments

Mohit Bhardwaj · Accepted Answer · 2016-06-23 14:03:16Z

0

<html>
<head>
<title>ForLoop</title>
</head>
<body>
<input id="answer"/><br/><br/>
<button id="btn">Generate</button><br/><br/>
<h1 id="ans"></h1>
<script>
  var MyArray=["Lion","Mouse","Cat","Dog","Buffalo","Cow","Rat","Tiger","Monkey","Lepoard","Lizard"];
  document.getElementById("btn").onclick=function(){
    var index = parseInt( document.getElementById("answer").value ) || 0;
    var ans=MyArray[ index ];
    document.getElementById("display").innerHTML= ans;
  }//onclick
</script>
</body>
</html>

edited Jun 23, 2016 at 14:03

answered Jun 23, 2016 at 13:42

Mohit Bhardwaj

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3 Comments

Mohit Bhardwaj Over a year ago

Please check now, I had copied your code and it had some extra braces.

Mandarr Sant Over a year ago

@ Mohit Bhardwaj still not i do not want to display as alert but as a text

Mohit Bhardwaj Over a year ago

@MandarSant updated my code to display as text in #display element.

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