HTML <select> 下拉式選單<option> <optgroup> | html select option default
<select> 用來建立下拉式選單 (dropdown menu),讓使用者可以從一堆選項中選擇出一個或多個選項。
<select> 本身做為選單的容器,在 select 裡面用 <option> 標籤來建立個別選項。
舉個例子:
<select> <option>請選擇你最愛的寵物</option> <option>Dog</option> <option>Cat</option> <option>Hamster</option> <option>Parrot</option> <option>Spider</option> <option>Goldfish</option> </select>顯示結果:
請選擇你最愛的寵物DogCatHamsterParrotSpiderGoldfish
<select> 標籤上可以用的屬性 (attributes)name: 聲明欄位名稱disabled: 將欄位設定為禁用的狀態,是一個布林 (boolean) 屬性required: 將欄位設定為必填,是一個布林 (boolean) 屬性<option> 選單中的選項<option> 是用來建立選項,而選項內容放在 <option></option> 標籤裡面。
<option> 標籤上有這些屬性:
value: 指定如果選了該選項,表單要傳送什麼值給遠端伺服器,如果沒設定 value,預設是送 <option> 的內容selected: 設定預先選取此選項,是一個布林屬性label: 說明選項的含義,有設定時會被瀏覽器顯示為選項內容,通常用來當做簡短版的選項文字disabled: 將選項設定為不可選的狀態,是一個布林 (boolean) 屬性綜合上面講到的屬性,舉個比較完整的下拉選單範例:
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How can I set the default value for an HTML <select> element ... | html select option default
Set selected=selected for the option you want to be the default. <option selected=selected> 3 </option>. Read More
default select option as blank | html select option default
Maybe this will be helpful <select> <option disabled selected value> -- select an option -- </option> <option>Option 1</option> <option>Option ... Read More
How to set default value for HTML select? | html select option default
2013年10月26日 — and I have a variable named temp in my JavaScript: var temp = a;. Now I want to set the value of the option that is equal to ... Read More
How to set the default value for an HTML <select> element ... | html select option default
2019年5月14日 — The default value of the select element can be set by using the 'selected' attribute on the required option. This is a boolean attribute. The option ... Read More
HTML option selected Attribute | html select option default
Definition and Usage ... The selected attribute is a boolean attribute. When present, it specifies that an option should be pre-selected when the page loads. The pre- ... Read More
加入VALUE 與SELECTED 預設參數 | html select option default
<HTML> <HEAD> <TITLE>加入VALUE 與SELECTED 預設參數</TITLE> ... <form> 您喜愛的口味: <SELECT NAME=STYLE> <OPTION VALUE=1>鮪 ... Read More
<select>: The HTML Select element - HTML | html select option default
2021年6月7日 — The <select> HTML element represents a control that provides a menu of options: ... You can include a selected attribute on an <option> element to make it ... dropdown menu, the second option of which is selected by default. Read More
HTML <select> 下拉式選單<option> <optgroup> | html select option default
2020年5月6日 — HTML 下拉式選單- <select>, <option>, <optgroup> 標籤(tag) ... 傳送什麼值給遠端伺服器,如果沒設定value,預設是送<option> 的內容; selected ... Read More
How can I set the default value for an HTML <select> element? | html select option default
Provide selected keyword inside the option tag, which you want to appear by default in your drop down list. Or you can also provide attribute to the ... Read More
How to set default value for HTML select? | html select option default
You first need to add values to your select options and for easy targetting give the select itself an id . Let's make option b the default: Read More
default select option as blank | html select option default
Maybe this will be helpful. <select> <option disabled selected value> -- select an option -- </option> <option>Option 1</option> ... Read More
How to show disable HTML select option in by default? | html select option default
use <option selected=true disabled=disabled>Choose Tagging</option>. Read More
How to set a default select option in HTML dropdown? | html select option default
The select element cannot have a default value that's absent from the option list. However, you can set its default option to display: none ... Read More
How to set the default value for an HTML <select> element | html select option default
2021年11月22日 — The default value of the select element can be set by using the 'selected' attribute on the required option. This is a boolean attribute. Read More
Select Default Value in HTML | html select option default
2021年7月4日 — We can use the selected=selected option to select default value in an HTML code. We write the selected attribute in the <option> tag. Read More
The HTML Select element | html select option default
4 天前 — The <select> element has some unique attributes you can use to control it, such as multiple to specify whether multiple options can be selected, ... Read More
How to set the default value for an HTML ... | html select option default
The <select> tag uses the <option> tag to present a set of available choices to the user. The challenge here is that, by default, the tag is displayed on ... Read More
How can I set the default value for an HTML <select> ... | html select option default
2010年8月19日 — Provide selected keyword inside the option tag, which you want to appear by default in your drop down list. Or you can also provide attribute ... Read More
<select>: The HTML Select element | html select option default
2023年7月17日 — You can include a selected attribute on an <option> element to make it selected by default when the page first loads. The <select> element has ... Read More
HTML option selected Attribute | html select option default
The selected attribute is a boolean attribute. When present, it specifies that an option should be pre-selected when the page loads. Read More
How to set default value of select in HTML? | html select option default
2020年7月28日 — I've made a select in html that looks like this <select name='select' id='select'><option value='val1'>Val1</option><option value='val2'>Val2</ ... Read More
How to Specify Default Value for HTML <select> Element? | html select option default
To set the default value for an HTML <select> element, it is required to specify the attribute “selected” for that option. This study has described the HTML < ... Read More
Select Default Value in HTML | html select option default
Use the <option selected> to Select Default Value for an HTML <select> Element. We can use the <option selected> option to select a default value in HTML. Read More
Set the select option as blank as default in HTML ... | html select option default
2011年12月22日 — As a workaround, you could replace the select element by a set of input type=radio elements (with the same name attribute). This creates a ... Read More
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