Creating_HTML_DD_List.md

                
                    
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                    title: Creating a HTML drop-down list
                
                    
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                    date: 2021 Oct 01
                
                    
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                    Inorder to create a drop-down selection list in HTML, we must first understand why they are important.<br />Drop-down lists can be used in lots of ways, from creating a way for people to chose from a strict set of options, to making an on-off switch(even though you should use buttons for that)<br />Before we start, here is an example:<table><td style="font-weight: bolder; text-align: right; font-size: 1em;">Select Image: </td><td><select id="selcet" onchange="document.getElementById('img').src = document.getElementById('selcet').value"><option value="https://upload.wikimedia.org/wikipedia/commons/a/a2/Paul_von_Hindenburg_%281914%29_von_Nicola_Perscheid.jpg" selected="true">Img 1</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Wilfried_Gruhn.jpg/121px-Wilfried_Gruhn.jpg">Img 2</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Blackcap_%28Sylvia_atricapilla%29_male.jpg/129px-Blackcap_%28Sylvia_atricapilla%29_male.jpg">Img 3</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/Lt._Gen._Nguy%E1%BB%85n_V%C4%83n_Thi%E1%BB%87u_at_Cam_Ranh_Base%2C_October_26%2C_1966.jpg/116px-Lt._Gen._Nguy%E1%BB%85n_V%C4%83n_Thi%E1%BB%87u_at_Cam_Ranh_Base%2C_October_26%2C_1966.jpg">Img 3</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/6/66/Steve_Stricker.jpg/157px-Steve_Stricker.jpg">Img 4</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Aegotheles_chrisoptus_-_Catlereigh_Nature_Reserve.jpg/350px-Aegotheles_chrisoptus_-_Catlereigh_Nature_Reserve.jpg">Img 5</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/Michael_Whelan_-_Lucca_2017.jpg/118px-Michael_Whelan_-_Lucca_2017.jpg">Img 6</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/St_Pancras_Railway_Station_2012-06-23.jpg/152px-St_Pancras_Railway_Station_2012-06-23.jpg">Img 7</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/8/8c/Mae_La_refugee_camp_TFA.jpg/162px-Mae_La_refugee_camp_TFA.jpg">Img 8</option><option value="https://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/JimmyCarterPortrait_%28cropped%29.jpg/121px-JimmyCarterPortrait_%28cropped%29.jpg">Img 9</option></select></td></table><img id="img" src="https://upload.wikimedia.org/wikipedia/commons/a/a2/Paul_von_Hindenburg_%281914%29_von_Nicola_Perscheid.jpg" style="width: auto; height: 10em;" /><div style="font-size: 10px;">Images from <a style="color: inherit;" href="https://en.wikipedia.org">Wikipedia</a>, on <a style="color: inherit;" href="https://web.archive.org/web/20211001135954/https://en.wikipedia.org/wiki/Main_Page">Oct. 2nd & </a><a style="color: inherit;" href="https://web.archive.org/web/20211002095505/https://en.wikipedia.org/wiki/Main_Page">1st, 2021</a></div>For some weird reason, it's not in<div class="code">&lt;input&gt;</div>It has it's own tags, know as <span class="code">&lt;select&gt;</span> and <span class="code">&lt;option&gt;</span>. Using these is alittle like making a list, if you've ever made one. Here's an example bit of HTML.<div class="code">&lt;select&gt;<div style="text-indent: 1em;">&lt;option&gt;op 1&lt;/option&gt;</div><div style="text-indent: 1em;">&lt;option&gt;op 2&lt;/option&gt;</div>&lt;/select&gt;</div>Next we want to add values to <span class="code">&lt;options&gt;</span>, and an id(#) to <span class="code">&lt;select&gt;</span>.<br />You most-likely already know how to do ids, and maybe also values(if you have used input in any way), so I'll leave it up to you.<br />However, you may not know some things that could be useful here, such as preselections, or making things update upon being changed, well, you can do preselections with <span class="code">selected</span> in the <span class="code">&lt;option&gt;</span> that you want to be preselected. Changes done the page upon the change of the selection in the drop-down(or anything else that can be changed by the user) is <span class="code">onchange="submitFunction()"</span> being placed in the <span class="code">&lt;select&gt;</span>.<br />Let's check back on the code that we made at the code example:<div class="code" id="finished">&lt;select onchange="submitFunction()" id="selection"&gt;<div style="text-indent: 1em;">&lt;option value="op1" selected&gt;op 1&lt;/option&gt;</div><div style="text-indent: 1em;">&lt;option value="op2"&gt;op 2&lt;/option&gt;</div>&lt;/select&gt;</div>Inorder to access the selected option with JavaScript, use <span class="code">document.getElementById("selection").value</span><br />That's basically it, feel free to <span class="code">CTRL + C</span> <span class="code">CTRL + V</span> it. /s