html-select

问题 I have code as this : <select> <option>1</option> <option>2</option> <option>3</option> </select> can i use like this ? <select> <option>¹</option> <option>²</option> <option>²</option> </select> 回答1: You can't use another tag inside options tag. But you can do something like: <select> <option>¹</option> <option>²</option> <option>³</option> </select> This &sub1 , &sub2 , &sub3 is only possible for 1, 2 and 3. You can write other numbers using codes from here:

问题 I have 3 select statements that each share the same 5 options. How can i make sure that when an option is picked in one of the selects, it won't appear in any of the other? <select> <option>A</option> <option>B</option> <option>C</option> <option>D</option> <option>E</option> </select> <select> <option>A</option> <option>B</option> <option>C</option> <option>D</option> <option>E</option> </select> <select> <option>A</option> <option>B</option> <option>C</option> <option>D</option> <option>E<

问题 Is it possible to dynamically populate a selectbox with options as well as optgroups, using the .options property of the element? Simplified, this is what I'm doing now (imagine the loop is dynamic, have to do by script): var demo = document.getElementById("d").children[0]; for (var i = 1; i <= 5; i++) { // this will in this case auto-select and default-select the third option demo.options[demo.options.length] = new Option("Value: " + i, i, i == 3, i == 3); } <div id="d"> <select></select> <

问题 Is it possible to dynamically populate a selectbox with options as well as optgroups, using the .options property of the element? Simplified, this is what I'm doing now (imagine the loop is dynamic, have to do by script): var demo = document.getElementById("d").children[0]; for (var i = 1; i <= 5; i++) { // this will in this case auto-select and default-select the third option demo.options[demo.options.length] = new Option("Value: " + i, i, i == 3, i == 3); } <div id="d"> <select></select> <

问题 To set data of an <input> element using JavaScript, we assign the value and name of that element like this: var form = document.createElement("form"); var element = document.createElement("input"); element.value=value; element.name=name; In the case of a <select> where the multiple attribute is present, how do I set the value of that select element? For instance, how would I set the value of the myselect element below: <form method="post" action="/post/" name="myform"> <select multiple name=

问题 The following is a snippet from my HTML form which pulls the options from the table rows accordingly. What I want to do is have the first option value to be NULL so when no choice is made, NULL is entered when the form is submitted to the database. <td>Type</td> <td>:</td> <td><select name="type_id" id="type_id" class="form"> <option value=""></option> <?php $sql = mysql_query("SELECT type_id, type FROM $tbl_add_type") or die(mysql_error()); while ($row = mysql_fetch_array($sql)) { echo "

问题 I added onclick event to my select tag like in the following code - <option onclick="alert('Hello')">Say Hello</option> but it does not work.... How can I set the option onclick event to fire ? 回答1: Try it in the onchange handler: function checkAlert(evt) { if (evt.target.value === "Say Hello") { alert('Hello'); } } <select onchange="checkAlert(event)"> <option>Test</option> <option>Say Hello</option> </select> 回答2: I prefer using Ids to add event listener to separate your code from html so I

问题 Is there a way to include a default empty option (or with text) if there is no selected value for a dropdownlist? 回答1: The below will prepend string.Empty to the SelectList (or IEnumerable) specified in the ViewData["Menu"] item. The select will have id and name MenuID . <%= Html.DropDownList( "MenuID", (IEnumerable<SelectListItem>)ViewData["Menu"], string.Empty ) %> Documentation: DropDownList method 回答2: For Example: Controller : private void InitScreenInfoCollate() { IEnumerable<MstBrd>

问题 In the snippet below, I have two methods to choose an item: input with datalist and traditional select with options. The select element keeps the option values hidden, and we're still able to get it with this.value . However, with the datalist, the value is actually displayed and the text content of the option is displayed as a secondary label. What I'd like is to have the input+datalist approach behave like a traditional select, where "Foo" and "Bar" are shown as options that when selected

问题 In the snippet below, I have two methods to choose an item: input with datalist and traditional select with options. The select element keeps the option values hidden, and we're still able to get it with this.value . However, with the datalist, the value is actually displayed and the text content of the option is displayed as a secondary label. What I'd like is to have the input+datalist approach behave like a traditional select, where "Foo" and "Bar" are shown as options that when selected