-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Updated Creating html drop down list
- Loading branch information
1 parent
d482f57
commit 580095a
Showing
1 changed file
with
38 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,42 @@ | ||
| --- | ||
| title: Creating a HTML drop-down list | ||
| date: 2021 Oct 01 | ||
| updated: 2024 Jan 26 | ||
| --- | ||
| 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"><input></div>It has it's own tags, know as <span class="code"><select></span> and <span class="code"><option></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"><select><div style="text-indent: 1em;"><option>op 1</option></div><div style="text-indent: 1em;"><option>op 2</option></div></select></div>Next we want to add values to <span class="code"><options></span>, and an id(#) to <span class="code"><select></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"><option></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"><select></span>.<br />Let's check back on the code that we made at the code example:<div class="code" id="finished"><select onchange="submitFunction()" id="selection"><div style="text-indent: 1em;"><option value="op1" selected>op 1</option></div><div style="text-indent: 1em;"><option value="op2">op 2</option></div></select></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 | ||
| In order to create a drop-down selection list in HTML, we must first understand why they are important. | ||
|
|
||
| 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). | ||
|
|
||
| Before we start, here is an example: | ||
|
|
||
| **Select Image:** <select id="select" onchange="document.getElementById('img').src = document.getElementById('select').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> | ||
|
|
||
| <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;" /> | ||
|
|
||
| <small>Images from <a href="https://en.wikipedia.org">Wikipedia</a>, on <a href="https://web.archive.org/web/20211001135954/https://en.wikipedia.org/wiki/Main_Page">Oct. 2nd</a> & <a href="https://web.archive.org/web/20211002095505/https://en.wikipedia.org/wiki/Main_Page">1st, 2021</a></small> | ||
|
|
||
| For some weird reason, it's not in `<input>`, it has it's own tags: `<select>` and `<option>`. Using these is a little like making a list, if you've ever made one. Here's an example bit of HTML: | ||
|
|
||
| ```html | ||
| <select> | ||
| <option>op 1</option> | ||
| <option>op 2</option> | ||
| </select> | ||
| ``` | ||
|
|
||
| Like all `input`s, `select` can have an id and name, and like `input[type=radio]`, `option` can have a value. | ||
|
|
||
| However, you may not know some things that could be useful here, such as defaulting, or making things update upon being changed, well, you can do defaulting with `selected` in the `<option>` 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 `onchange="submitFunction()"` being placed in the `<select>`. | ||
|
|
||
| Let's check back on the code that we made at the code example: | ||
|
|
||
| ```html | ||
| <select onchange="submitFunction()" id="selection"> | ||
| <option value="op1" selected>op 1</option> | ||
| <option value="op2">op 2</option> | ||
| </select> | ||
| ``` | ||
|
|
||
| Inorder to access the selected option with JavaScript, use `document.getElementById("selection").value`. | ||
|
|
||
| That's basically it, feel free to `CTRL + C` `CTRL + V` it. /s |