javascript - Binding a change event to the input file will be effective in the first execution, but will have no effect in subsequent executions.

Binding a change event to the input file will be effective in the first execution, but will have no effect in subsequent executions.

大家讲道理 2017-05-19 10:41:38 0  2  706

android - When I enter the first letter of duration in translate, there is no prompt. What's going on? ? ?

When I enter fromXDelta, fromYDelta, toXDelta, toYDelta in translate, there are prompts for the first letters, but when I enter the first letters of duration, there are no prompts. What's going on? ? What to do? ?

学习ing 2017-06-13 09:22:56 0  1  1042

javascript - How to output the newline character in a string in html

I obtained a string in the background and output it to the <p> tag in the foreground, but there was a newline character 'n' in the string, and I wanted to output the newline effect in the same way. How should I deal with this string? I replaced 'n' with <br/> but it still...

为情所困 2017-06-14 10:51:21 0  6  1115

Title rewritten to: Error: Invalid element type: Expected string (for built-in components) or class/function (for composite components) but got undefined element type

How can I solve this problem in my ReactNative code? The error reads "Error: Invalid element type: expected string (for built-in components) or class/function (for composite components), but got undefined. You may have forgotten to export the component from the file in which it was defined, or ...

P粉701491897 2023-09-01 13:23:24 0  1  596

javascript - js (Vue) practice: How to input @, and then a list of related candidates will automatically appear?

The effect is as follows: Effect description: 1. The user enters the @ symbol, an option list appears, and the option list is automatically positioned behind the @ symbol. (The current idea is: dynamically monitor the input character if it is @, and the list box appears at the cursor hovering positi...

PHP中文网 2017-07-05 11:03:32 0  3  3636

python - How to add multiple database support in flask and display the query results on the page in a table?

As shown in the picture, what I want to achieve is the effect as shown above. Select different databases through the web interface, enter the query SQL in the middle input field, and click Execute to display the query results in a table below. If there is an error, , the original error message is di...

为情所困 2017-06-30 09:55:24 0  1  1057

apache2.4 cannot be started, error (20024)

Command: Go to the bin directory of Apache and enter httpd.exe -k start (if there is no -k start, no information will pop up or end) Error message: (20024) The given path is misformatted or contained invalid characters: AH00532: Inval id...

伊谢尔伦 2017-05-16 17:03:08 0  3  898

Vuetify v-select attribute type check fails

When I use v-select in Vuetify3, I often encounter the following error: [Vue warning]: Invalid prop: Type check failed for prop 'title'. Expected String|Number|Boolean but got Object in

P粉988025835 2023-09-04 15:59:13 0  1  551

javascript - js test regular expression encountered a strange problem

{Code...} If you write it like this, the regular expression will work. If you write it like this, the regular expression will be invalid. Entering letters can also pass the verification! {Code...}

伊谢尔伦 2017-07-05 10:51:10 0  1  750

Questions about C++ input

There is such a program: {Code...} If I directly input a large number (such as 99999999999, in fact, only >4 bytes are enough), or letters, the following output will be produced: {Code... } How to understand this? C++ novices kneel down and ask the master for advice.

漂亮男人 2017-07-03 11:42:01 0  2  881

javascript - vue mobile terminal input numeric input optimization

This is used on the mobile terminal. When the input type is number, there is no limit in English or Chinese, and maxlength has no effect. When the input type is tel, there is no limit in English or Chinese, but maxlength has an effect, so tel and keyup are used. Filter characters other than numbers....

phpcn_u1582 2017-07-05 10:59:49 0  3  1005

If Promise object rejects itself - Stack Overflow

Code: {Code...} Firefox only outputs reject, and Chrome inputs normally, and then Uncaught (in promise) will appear. Why does an uncaught exception occur? The catch of p is clearly defined, and why does Firefox only output The operations of outputting reject and outputting p have no effect (actually...

女神的闺蜜爱上我 2017-06-14 10:53:56 0  2  751

javascript - js input box word limit problem

js input box limits the number of words in the input box, the following code {code...} In the actual process, the following problems were found, as shown in the figure: In the input method, the letters are displayed first, and then the pinyin of the letters is converted into Chinese characters. Ther...

高洛峰 2017-07-05 10:38:10 0  6  938

Replace part of string in WYSIWYG editor using JSX

I have a string provided by a WYSIWYG editor input, for example: constoriginalString="some text some bold text {{response}}"; I need to replace {{response}} with some JSX and output the result as HTML. I don't think I can use dangerouslySetInnerHTML because it doesn't handle JSX. Instead y...

P粉060112396 2023-08-17 10:28:01 0  1  535

Way to restrict date picker to only accept numbers and hyphens, and restrict other values ​​in Vue

I'm using the vue2-datepickernpm package to handle dates. Date input accepts all letters, numbers and special characters. But I want the input to only accept numbers, hyphens and slashes. I can easily achieve this using normal html input. But how to implement it in date picker? Any help would be gre...

P粉729518806 2023-08-26 14:57:04 0  1  633

PHP inserts strange symbols instead of polish letters

When I use this code to insert data from mysql database it does not populate with polish letters but shows random weird symbols instead of polish letters Also this seems to be a problem with the database site but I have it on utf8_polish_ci: PHP displays symbols instead of letters $con=mysqli_connec...

P粉189606269 2024-02-26 19:48:29 0  1  413

javascript - Assign the obtained text element to var x; why can't it be judged whether the input text is empty?

Assign the obtained text element to var x; why does it not take effect to determine whether the input text is empty? document.getElementById("demo").innerHTML; Is the element obtained a string or something else? It is a string. Why does using x.length to determine the length of a string no...

我想大声告诉你 2017-05-18 11:00:49 0  4  555

Is there any way to use python to output this string of data in the format I want?

{Code...} I want to output the above string of data in the format of {Code...}. Is there any other way? I've been thinking about it for a long time and can't think of an effective way to do it.

漂亮男人 2017-06-12 09:21:18 0  3  695

Why do regular expressions for global flags cause incorrect output?

What's wrong with this regex when I use global flag and case insensitive flag? Queries are user-generated input. The result should be [true,true]. varquery='FooB';varre=newRegExp(query,'gi');varresult=[];result.push(re.test('FooBar'));result.push(re.test('FooBar')); //The result will be [true,false]...

P粉282627613 2023-08-22 19:11:39 0  2  519

javascript - Problem with route transition in vue?

Vue adds a cutscene animation fade-in and fade-out effect to the route. The component fades out when it is removed, but when it is entered, it enters instantly and does not fade in. Between these two steps, the page will become blank. The following is my code, copied from the official website: {code...

滿天的星座 2017-06-12 09:30:07 0  3  761