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POHow to perform a case insensitive string comparison?
 

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  1. POHow to perform a case insensitive string comparison?
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    <p>I have a textbox on my website and the user can input commands. But the thing is the commands are case sensitive. How do I make the commands not case sensitive? Here is my code: </p> <p>JavaScript:</p> <pre><code>function showAlert() { var txtCtrl = document.getElementById("textbox1"); var txtVal = txtCtrl.value; if (txtVal == '') { alert('Please fill in the text box. For a list of commands type "Help" into the text box.'); }else if (txtVal == 'Start' || txtVal == 'start') { alert('Hello. What would you like me to do?'); }else if (txtVal === 'Weather' || txtVal === 'weather') { window.location = "https://www.google.com/#q=weather"; }else if (txtVal === 'Time' || txtVal === 'time') { alert('The current time according to your computer is' + formatTime(new Date())); }else if (txtVal === 'Help' || txtVal === 'help') { window.location = "help/index.html"; }else if (txtVal === 'Donate' || txtVal === 'donate') { window.location = "donate/index.html"; }else if (txtVal === 'www.' || txtVal === 'WWW.') { }else{ alert('Sorry, I do not reconise that command. For a list of commands, type "Help" into the text box.'); } } //Show time in 24hour format function showTime(){ var today = new Date(); var h = today.getHours(); var m = today.getMinutes(); return [ h, m ].join(':') } //Show time in 12hour format var formatTime = (function () { function addZero(num) { return (num &gt;= 0 &amp;&amp; num &lt; 10) ? "0" + num : num + ""; } return function (dt) { var formatted = ''; if (dt) { var hours24 = dt.getHours(); var hours = ((hours24 + 11) % 12) + 1; formatted = [formatted, [addZero(hours), addZero(dt.getMinutes())].join(":"), hours24 &gt; 11 ? "PM" : "AM"].join(" "); } return formatted; } })(); </code></pre> <p>And HTML:</p> <pre><code>&lt;!doctype html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Random Project&lt;/title&gt; &lt;/head&gt; &lt;style type="text/css"&gt; body { margin:0; font-family: arial, sans-serif; padding-top: 80px; } .container { margin:auto; text-align:center; } .logo { margin:auto; width:512px; text-align:center; padding-bottom:0px; } #textbox1 { border: 1px solid #ddd; border-radius: 0px 0px 0px 0px; width: 512px; padding-top: 5px; padding-bottom: 5px; padding-left: 7px; padding-right: 7px; height: 20px; font-size: 16px; outline: none; font-family: arial, sans-serif; } #textbox1:focus { border: 1px solid #0266C8; } #button1 { margin-top: 22px; padding: 2px 10px 2px 10px; outline:none; background-color:#eee; border:1px solid #ddd; border-radius:2px; } #button1:hover { background-color: #f5f5f5; } #button1:focus { border: 1px solid #0266C8; } #button1_text { font:bold 11px/27px Arial,sans-serif!important; color:#333; } .information { font-size:12px; color:#555; } .separator { height:100px; } .tip { color:green; font-weight:bold; font-size:12px; margin-top:10px; } .tip_text { color:#111; font-weight:normal; } &lt;/style&gt; &lt;body&gt; &lt;div class="container"&gt; &lt;img class="logo" src="logo.png" width="450" height="110" alt="Random Project"&gt; &lt;input type="text" name="textbox1" value="" spellcheck="false" dir="ltr" placeholder="Type here" id="textbox1"&gt;&lt;br&gt; &lt;button id="button1" name="button1" aria-label="Help me" onClick="showAlert();"&gt; &lt;span id="button1_text"&gt;Help me&lt;/span&gt; &lt;/button&gt; &lt;div class="separator"&gt;&lt;/div&gt; &lt;span class="information"&gt;&amp;copy; Copyright DemDevs 2013. All rights reserved. Made by Omar Latreche&lt;br&gt;&lt;a href="donate/index.html"&gt;Donate now&lt;/a&gt;&lt;/span&gt; &lt;div class="tip"&gt; &lt;span class="tip"&gt;Tip: &lt;/span&gt;&lt;span class="tip_text"&gt;The commands are NOT case sensitive&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=""&gt;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Any help will be greatly appreciated.</p> <p>Thanks, Omar!</p> <p>Edit:</p> <p>I figured it out, I made two new variables: </p> <pre><code>var txtValUpper = txtVal.toUpperCase(); </code></pre> <p>and </p> <pre><code>var txtValLower = txtVal.toLowerCase(); </code></pre> <p>then put them into the code for example: </p> <pre><code>if (txtValUpper == 'start' || txtValLower == 'start') { alert('Hello. What would you like me to do?'); } </code></pre>
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    1. COTurn the command value and the value you compare it to into upper or lower-case variants.
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      1. POHow to perform a case insensitive string comparison?
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    2. CO@Juhana: You have a real gift for finding the original when duplicates are posted. I'm sure you don't get thanked enough, so: Thank you.
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    3. CO@T.J.Crowder Thanks, sometimes you just know the question must have been asked a million times before :)
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