We can access the JavaScript object by using brackets [0] or by using. Both do exactly the same thing. Then we just access the checked property directly. It will return a boolean value we can then use as before:. Do not use the jQuery function attr to check for the current state of a checkbox.
This is a common mistake some developers do and that will for sure lead to problems. We can access attributes using jQuery when using the attr function. But here's the deal: the attribute will still be checked even when the user changed it afterward. The attribute doesn't reflect the state of the checkbox. It only reflects the default value on page load.
Usually, each state attribute has its own JavaScript property that you can access in the same way. Other ways of checking it Like on many things in life, there are many ways of doing the same thing, and this case is no different. Working Fiddle. If the checkbox is checked it will return true otherwise undefined. Just to say in my example the situation was a dialog box that then verified the check box before closing dialog.
None of above and How to check whether a checkbox is checked in jQuery? This worked so calling the class then the ID. It may be due to the nested DOM elements on this page causing the issue. The workaround was above. You can use it in if clause as normal boolean expression.
Actually, according to jsperf. I personally prefer. Using this code you can check at least one checkbox is selected or not in different checkbox groups or from multiple checkboxes. Using this you can not require to remove IDs or dynamic IDs. This code work with the same IDs. Reference Link. Here's a pure vanilla Javascript onload listener option:. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Check if checkbox is checked with jQuery Ask Question. Asked 11 years, 9 months ago. Active 24 days ago. Viewed 2. How can I check if a checkbox in a checkbox array is checked using the id of the checkbox array? Improve this question. Jake Jake Make sure your id s are unique! Possible duplicate of How to check whether a checkbox is checked in jQuery? Add a comment. Active Oldest Votes. Improve this answer. Kaspar Lee 5, 4 4 gold badges 29 29 silver badges 53 53 bronze badges.
John Boker John Boker Essentially, then, the indeterminate attribute adds a third possible state to the checkbox: "I don't know. For instance, browsers on macOS may draw the checkbox with a hyphen "-" inside to indicate an unexpected state. Note: No browser currently supports indeterminate as an attribute.
It must be set via JavaScript. See Indeterminate state checkboxes for details. If the value is not otherwise specified, it is the string on by default. This is demonstrated in the section Value above. We already covered the most basic use of checkboxes above.
Let's now look at the other common checkbox-related features and techniques you'll need. The example we saw above only contained one checkbox; in real-world situations you'll be likely to encounter multiple checkboxes.
If they are completely unrelated, then you can just deal with them all separately, as shown above. However, if they're all related, things are not quite so simple. For example, in the following demo we include multiple checkboxes to allow the user to select their interests see the full version in the Examples section.
In this example you will see that we've given each checkbox the same name. When this string reaches the server, you need to parse it other than as an associative array, so all values, not only the last value, of interest are captured.
To make a checkbox checked by default, you give it the checked attribute.
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