Updating a conditional statement in jQuery

Understanding jQuery has always been a challenge for me. I find myself spending hours reading documentation every time I try to implement it, only to achieve very little progress. Here's the code I'm currently working on with live-editing available:

http://codepen.io/anon/pen/vKFBy

The code filters records in real-time as you type in an input field. However, I'm facing an issue with the search method it uses. Let me explain further:

<ul id="list">
  <li class="in"><span>google.com</span></li>
  <li class="in"><span>gmail.com</span></li>
  <li class="in"><span>samsung.com</span></li>
  <li class="in"><span>amazon.de</span></li>
  <li class="in"><span>apple.de</span></li>
</ul>

For example, when I type "G" or "g," amazon.de and apple.de disappear because they do not contain the letter "G," while google.com, gmail.com, and samsung.com remain visible. This is the issue I'm facing. I do not want to keep samsung.com just because it contains a "G" at some point. I want to only display elements where the span begins with a specific string. Essentially, this is what I'm trying to achieve:

When I type "G":

<ul id="list">
  <li class="in"><span>google.com</span></li>
  <li class="in"><span>gmail.com</span></li>
  <li class="hiding out hidden"><span>samsung.com</span></li>
  <li class="hiding out hidden"><span>amazon.de</span></li>
  <li class="hiding out hidden"><span>apple.de</span></li>
</ul>

Continuing to type "Go":

<ul id="list">
  <li class="in"><span>google.com</span></li>
  <li class="hiding out hidden"><span>gmail.com</span></li>
  <li class="hiding out hidden"><span>samsung.com</span></li>
  <li class="hiding out hidden"><span>amazon.de</span></li>
  <li class="hiding out hidden"><span>apple.de</span></li>
</ul>

I am aware of the syntax I should be using, such as:

indexOf(searchTerm)

Or:

[span^="'+searchTerm+'"]

Or:

str.match(/^searchTerm/)

However, I am struggling to incorporate these into the current if statements without breaking the script every time.

jqueryhtmlcssif-statement

Answer №1

To enhance the functionality, develop a unique :startswith custom selector (or use :startswithi for specific needs) and validate the position 0 on the indexOf match:

http://jsfiddle.net/TrueBlueAussie/z148kzeo/

    //extends :contains to be case insensitive
    $.extend($.expr[':'], {
        'startswith': function (elem, i, match, array) {
            return (elem.textContent || elem.innerText || '').toLowerCase()
                .indexOf((match[3] || "").toLowerCase()) == 0;
        }
    });

Kindly consider inserting your custom selector within a keyup handler event (on each keyup). I recommend placing it at the beginning.

Answer №2

Make sure your indexOf function verifies that the index found is at the beginning or greater than 0. Update it to be equal to 0 for checking the start of the string:

{
return (elem.textContent || elem.innerText || '').toLowerCase()
    .indexOf((match[3] || "").toLowerCase()) >= 0;
}

See it in action here: http://codepen.io/anon/pen/japcB

Answer №3

While browsing through the existing answers, I came up with an additional suggestion. Try extracting the value from your search text and converting it into a regular expression pattern. Then, search for this pattern within the list elements. Though I'm no expert, this idea popped into my mind right away. Hopefully, it proves useful to someone :)

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