如何使用 jQuery 获取在文本框中输入的文本长度?
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How can I get the length of text entered in a textbox using jQuery?
提问by Blankman
How can I get the length of text entered in a textbox using jQuery?
如何使用 jQuery 获取在文本框中输入的文本长度?
回答by yfeldblum
var myLength = $("#myTextbox").val().length;
回答by Jonathan Tran
If your textbox has an id attribute of "mytextbox", then you can get the length like this:
如果你的文本框有一个“mytextbox”的 id 属性,那么你可以得到这样的长度:
var myLength = $("#mytextbox").val().length;
$("#mytextbox")
finds the textbox by its id..val()
gets the value of the input element entered by the user, which is a string..length
gets the number of characters in the string.
$("#mytextbox")
通过其 id 找到文本框。.val()
获取用户输入的输入元素的值,是一个字符串。.length
获取字符串中的字符数。
回答by Rohith
For me its not text box its a span tag and this worked for me.
对我来说,它不是文本框,它是一个跨度标签,这对我有用。
var len = $("span").text().length;
回答by Aqib Shehzad
Below mentioned code works perfectly fine for taking length of any characters entered in textbox.
下面提到的代码非常适合获取文本框中输入的任何字符的长度。
$("#Texboxid").val().length;
$("#Texboxid").val().length;
回答by Fadid
CODE
代码
$('#montant-total-prevu').on("change", function() {
var taille = $('#montant-total-prevu').val().length;
if (taille > 9) {
//TODO
}
});
回答by daveslab
You need to only grab the element with an appropriate jQuery selector and then the .val()
method to get the string contained in the input textbox and then call the .length
on that string.
您只需要使用适当的 jQuery 选择器获取元素,然后.val()
获取包含在输入文本框中的字符串的方法,然后.length
在该字符串上调用。
$('input:text').val().length
$('input:text').val().length
However, be warned that if the selector matches multiple inputs, .val()
will only return the value of the firsttextbox. You can also change the selector to get a more specific element but keep the :text
to ensure it's an input textbox.
但是,请注意,如果选择器匹配多个输入,.val()
则只会返回第一个文本框的值。您还可以更改选择器以获得更具体的元素,但保留:text
以确保它是一个输入文本框。
On another note, to get the length of a string contained in another, non-input element, you can use the .text()
function to get the string and thenuse .length
on thatstring to find its length.
另一方面,要获取包含在另一个非输入元素中的字符串的长度,您可以使用该.text()
函数获取该字符串,然后.length
在该字符串上使用它来查找其长度。