I would advise you to care though, and have the code know what the months are and build selectors for each option. Something like this untested :. Of course, I would try to find a better name than opt1 or opt2but I dont have enough knowledge of what you are trying to achieve to suggest something more meaningful. Finally, you could cache the selectors for each option, I leave that as an exercise for the reader.
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Can you explain why is better? Am I wrong? From a software maintenance perspective, the second option is better. But, if you are comfortable by only caching 48 and 42, then you can go for that. Sign up or log in Sign up using Google.Note: Due to the size or complexity of this submission, the author has submitted it as a. After downloading it, you will need a program like Winzip to decompress it. Virus note: All files are scanned once-a-day by SourceCodester.
The process of adding can be controlled based on different condition required. Depending on conditions options can be removed also. Here we will take care that the options are added on the page loadso by default the list box is pre populated when the page is displayed. You can see the demo at the end of this page. Here is the function which collects the list box name, value and text as inputs and then adds the option to the list box.
So we can add one option by calling the function once. Like this. So with this now you can easily create the list box. But we will add another step to this by using one array of months. So from the array of months we will loop through and add each month to the list box. Here is the code. Here is the syntax for this. To make it clear we will use this in our Listbox demo shown above.
We will keep the current month selected while populating the listbox. To get the current month we will use getMonth function. Demo of selecting default option Here is the change in source code. The advantage of datalist is users is not limited to given options only. You can learn basics of datalist in our HTML section.
The countries state variable is an array, and its elements are assigned inside the componentDidMount lifecycle method. If you have an API, you can call it and do the assignments of the response data here. Now inside the render method, we make use of the Array. Just like the countries state variable in the above section, the colours state variable which is an object is also assigned the key-value pairs inside the componentDidMount method. Inside renderwe first make use of the Object.
But often we need to pass along additional information besides the usual value. For example, in the above case, you might need to pass along the ISD code too. Take another example. Consider a dropdown list of movies. You might have set the values to movie names but at the same time need to pass along the release year. There are many such cases we come across when we develop an application. Such additional data are best stored by custom data attributes.
An HTML element can have any number of custom attributes with any value. For example, in a typical country list dropdown as in the example aboveif you have set the values to respective ISO code, you can store their ISD codes in a custom attribute like data-isd.
In a dropdown list of movies, if you have set the values to movie names, their respective release years can be stored in a custom data attribute like data-year. Now that we have assigned the custom data attributes, how do we access them? We pick the dropdown list of our first example, the country dropdown list. We define selectCountry as a method inside the class constructor. Now here is the most important part. Note carefully the last line. The data-isd attribute is accessed as dataset.
On select of Albaniathe above selectCountry method logs in the browser's console the value stored in the custom data-isd attribute.Sponsored by and others. Copy code. Please tell us why you want to mark the subject as inappropriate.
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Can you give me some pointers? And, finally after quite a delay I don't recommend doing DOM manipulations inside a loop -- that can get expensive in large datasets.
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Instead, I would do something like this:. It is used as a light-weight version of Document to store a segment of a document structure comprised of nodes just like a standard document.
The key difference is that because the document fragment isn't part of the actual DOM's structure, changes made to the fragment don't affect the document, cause reflow, or incur any performance impact that can occur when changes are made. The one thing I'd avoid is doing DOM operations in a loop to avoid repeated re-renderings of the page.
Edit: removed the function to show how you can just assign the html you've built up to another select element - thus avoiding the unnecessary looping by repeating the function call. See: What is the best way to add options to a select from an array with jQuery? When you create a new Option object, there are two parameters to pass: The first is the text you want to appear in the list, and the second the value to be assigned to the option.
None of the above solutions worked for me. Append method didn't give error when i tried but it didn't solve my problem. In the end i solved my problem with data property of select2. I used json and got the array and then give it in select2 element initialize.
For more detail you can see my answer at below post. Often you have an array of related records, I find it easy and fairly declarative to fill select this way:. This will replace existing options.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I tested it on IE7. Instead of modifying the HTML itself, you should just set the value you want from the relative option element:.
The above will also work if you build the options dynamicallyand than only afterwards you want to set one option to be defaultSelected. Ideally use. In the demo above Document. Instead, the fragment containing all the Options is appended to the Select only once.
The selectedness of an option element is a boolean stateinitially false. Except where otherwise specified, when the element is created, its selectedness must be set to true if the element has a selected attribute.
Getting MutationObservers out from call-stack Although the test 2. Should one use. Or should one read the state by using. Instead test 3. To set the input option at run time try setting the 'checked' value. Realize this is an old question, but with the newer version of JQuery you can now do the following:. The ideas on this page were helpful, yet as ever my scenario was different. Works on Firefox at least; you might want to try it out in the others.
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Active Oldest Votes. Good question. David Tang David Tang That's not what the OP is asking for. OP wants the reset button to work.