html-select | 易学教程

Get selected option from select element

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问题 I am trying to get the selected option from a dropdown and populate another item with that text, as follows. IE is barking up a storm and it doesn't work in Firefox: $('#ddlCodes').change(function() { $('#txtEntry2').text('#ddlCodes option:selected').text(); }); What am I doing wrong? 回答1: Here's a short version: $('#ddlCodes').change(function() { $('#txtEntry2').text($(this).find(":selected").text()); }); karim79 made a good catch, judging by your element name txtEntry2 may be a textbox, if

Firefox not refreshing select tag on page refresh

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问题 I've run into a problem where I have a select tag that the user would use to select a brand of phone and the page using jquery would then just display those phones. Thanks to the help of the people on stack overflow this now works great on every browser but firefox. For some reason when I refresh the page the select tag shows the last selected option but the page shows all phones available as designed. Does anyone have any suggestions or advice on getting firefox to refresh the select tag? I

How can I change the font-size of a select option? [duplicate]

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This question already has an answer here: How to style a select tag's option element? 5 answers I am trying to style a select option dropdown list. Is it possible to make the font-sizes of the options different from the default value? For example, the default: -- Select Country -- Would be size 7pt; and one of the options, Georgia Would be size 13pt. This is my dropdown list: .select_join { width: 170px; height: 28px; overflow: hidden; background: url('http://s24.postimg.org/lyhytocf5/dropdown.png') no-repeat right #FEFEFE; border: #FEFEFE 1px solid; -webkit-border-radius: 3px; border-radius:

Is there a max number of options (values) in HTML drop down control?

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问题 Does anyone know how many options a drop down list can have? Is it unlimited? How many before performance degrades? 回答1: Does anyone know how many options a drop down list can have? Is it unlimited? I imagine it is unlimited in theory, obviously not in practice as a computer's RAM and the specific browser's limitations come into play. How many before performance degrades? Again, this would depend on a few factors, at the least the specific browser, the computer's memory and processing power.

How can I create an editable dropdownlist in HTML?

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I'd like to create a text field with a dropdown list that lets the user choose some predefined values. The user should also be able to type a new value or select a predefined one from a dropdown list. I know that I can use two widgets for that but in my app it would be more ergonomnic if it was unified in a one widget. Is there a standard widget or do I have to use a third party javascript? How about browser portability? The best way to do this is probably to use a third party library. There's an implementation of what you're looking for in jQuery UI and in dojo . jQuery is more popular, but

How to add Drop-Down list (<select>) programmatically?

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I want to create a function in order to programmatically add some elements on a page. Lets say I want to add a drop-down list with four options: <select name="drop1" id="Select1"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="mercedes">Mercedes</option> <option value="audi">Audi</option> </select> How can I do that? tymeJV This will work (pure JS, appending to a div of id myDiv ): Demo: http://jsfiddle.net/4pwvg/ var myParent = document.body; //Create array of options to be added var array = ["Volvo","Saab","Mercades","Audi"]; //Create and append select

Select with optgroup in Symfony 2.0

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问题 In Symfony2 , the select html component is rendered as a ChoiceType object, which is used indeed also for checkboxes and radiobuttons . Does someone really know how to render a select with the optgroup option in Symfony2 ? For sake of completeness, here I report an example of a select with the optgroup tag (example from w3cschools): <select> <optgroup label="Swedish Cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> </optgroup> <optgroup label="German Cars">

How to add option to select list in jQuery

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问题 My select list is called dropListBuilding . The following code does not seem to work: for (var i = 0; i < buildings.length; i++) { var val = buildings[i]; var text = buildings[i]; alert("value of builing at: " + i.toString() + " is: " + val); $("#dropListBuilding").addOption(val, text, false); } This line dies: $("#dropListBuilding").addOption(val, text, false); What is the right to add items to the drop down in jQuery? I have tested without that line and the buildings variable does have my

How do I set an un-selectable default description in a select (drop-down) menu in HTML?

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问题 I have a drop down where the user selects a language: <select> <option>English</option> <option>Spanish</option> </select> I want the default option that is initially displayed to say "Select a language" instead of "English" (my first option, displayed by default). I don't want the user to be able to select "Select a language". 回答1: If none of the options in the select have a selected attribute, the first option will be the one selected. In order to select a default option that is not the

HTML SELECT - Trigger JavaScript ONCHANGE event even when the option is not changed

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I have the following markup: <select onchange="jsFunction()"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> </select> When a user pulls down the combobox and selects the same option that was previously selected (or doesn't change the selection at all), JavaScript doesn't regard it as an onchange event. So, the jsFunction() is not called. But I want the jsFunction() called even in this case. How can I achieve this? Simon Aronsson I'd do it like this: <select onchange="jsFunction()"> <option value="" disabled selected style="display:none;">Label</option>