Prevent User From Writing More Than N Characters In A Textarea Using Prototype Event Observers

July 25, 2024 Post a Comment

I am aware that it's possible to emulate the maxlength property from input elements on a textarea by using this trick:

<p>Nonetheless the following should work (it does in FF and IE, in Opera it doesn't. Can't be bothered to check why)</p><pre><code id="code_0" class="hljs language-xml"><span class="hljs-tag"><<span class="hljs-name">textarea</span><span class="hljs-attr">rows</span>=<span class="hljs-string">"5"</span><span class="hljs-attr">cols</span>=<span class="hljs-string">"30"</span><span class="hljs-attr">id</span>=<span class="hljs-string">"myTextArea"</span>></span><span class="hljs-tag"></<span class="hljs-name">textarea</span>></span><span class="hljs-tag"><<span class="hljs-name">script</span><span class="hljs-attr">type</span>=<span class="hljs-string">"text/javascript"</span>></span><span class="language-javascript"><span class="hljs-keyword">var</span> maxLength = <span class="hljs-number">30</span>;
    <span class="hljs-title class_">Event</span>.<span class="hljs-title function_">observe</span>(<span class="hljs-string">'myTextArea'</span>, <span class="hljs-string">'keydown'</span>, <span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) {
        <span class="hljs-keyword">if</span> ($(<span class="hljs-string">'myTextArea'</span>).<span class="hljs-property">value</span>.<span class="hljs-property">length</span> == maxLength) {
            <span class="hljs-title class_">Event</span>.<span class="hljs-title function_">stop</span>(event);
            <span class="hljs-keyword">return</span><span class="hljs-literal">false</span>;
        }
    });
</span><span class="hljs-tag"></<span class="hljs-name">script</span>></span></code><button class="copy-btn btn btn-secondary btn-sm" onclick="copyCode(this,'code_0')">Copy</button></pre></div><h2 id="solution_2">Solution 2:

</h2><div class="answer-desc"><p>Trim is not a good solution, just try this to know why </p><a name='more'></a><p>Fill the textarea, then go to the middle part and type characters</p><p>That makes a horrible effect: The typed characters are taken and then it is trimed, so end text is lost.</p><p>maxlength=21
value(with length=21): "This Is What Is Typed"
then type before "What" this: "Not "
you will get: "This Is Not What Is T"</p><p>Desired effect is new typed characters are ignored, rather than discarding the end text.</p><p>In the example it is very short... imagine multi-lined textarea... user will continue typing in middle without seeing the end is being discarded.</p><p>Try the same example on an input type="text" with maxlength, you will see when limit is reached new typed characters are ignored, no matter where cursor is on the text, at start, midle or end.</p></div><h2 id="solution_3">Solution 3:

</h2><div class="answer-desc"><p>The <a rel="nofollow noreferrer noopener" href="http://api.prototypejs.org/dom/event.html#stop-class_method">documentation</a> states that <code>Event#stop</code> stops propagation <em>as well as</em> prevents default action. Does it not work?</p><p>Also, binding it to keydown/keyup doesn't prevent them from pasting large amount of text in the text area.</p><p>Like Joel said in his comment, preventing users from typing may not be a good idea. It is much better to put a validation + warning (like in the comment field of Stackoverflow).</p></div><h2 id="solution_4">Solution 4:

</h2><div class="answer-desc"><p>Use setInterval to periodically check state of your textarea, trim text if you want.</p></div>

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