OStack Q&A-Knowledge Sharing Community

0 votes

139 views

1 answer

How to crop an image in OpenCV using Python

How can I crop images, like I've done before in PIL, using OpenCV. Working example on PIL im = Image. ... please explain how I can correctly use this function. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

202 views

1 answer

Get selected value of a dropdown's item using jQuery

How can I get the selected value of a dropdown box using jQuery? I tried using var value = $('#dropDownId').val() ... ').val(); but both return an empty string. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

205 views

1 answer

jsonSchema attribute conditionally required

In jsonSchema you can indicate whether defined fields are mandatory or not using the "required" attribute: { ... mandatory-ness of the this field conditional? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.3k views

1 answer

url encoding - How to do URL decoding in Java?

In Java, I want to convert this: https%3A%2F%2Fmywebsite%2Fdocs%2Fenglish%2Fsite%2Fmybook.do%3Frequest_type To this: https:// ... how do I convert them? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

69 views

1 answer

Overriding methods using categories in Objective-C

Can I use a class category to override a method that is already implemented using a category? Like this: 1) Original ... } Will this work, or is this illegal? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

140 views

1 answer

sql - Query to get only numbers from a string

I have data like this: string 1: 003Preliminary Examination Plan string 2: Coordination005 string 3: Balance1000sheet The ... I want to implement it in SQL. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

76 views

1 answer

How can I use JQuery to post JSON data?

I would like to post Json to a web service on the same server. But I don't know how to post Json using JQuery. ... ? Or do I have to use a manual ajax request? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

277 views

1 answer

Why is one string greater than the other when comparing strings in JavaScript?

I see this code from a book: var a = "one"; var b = "four"; a>b; // will return true but it ... and b. I want to know how JavaScript compares these strings. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

379 views

1 answer

visibility - Understanding java's protected modifier

I have a class called A in package1 and another class called C in package2. Class C extends class A. A has ... class in another package. What's going on here? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

216 views

1 answer

jquery - Why the Ajax script is not running on IIS 7.5 Win 2008 R2 server?

I have a web app that works fine on VS 2013 on my development server, but once I published it on the IIS 7.5 2008 ... /fieldset> </div> </div> </body> </html> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.4k views

1 answer

matplotlib - pyplot scatter plot marker size

In the pyplot document for scatter plot: matplotlib.pyplot.scatter(x, y, s=20, c='b', marker='o', cmap=None ... want to figure out what does the s number mean. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

596 views

1 answer

How do I render a Word document (.doc, .docx) in the browser using JavaScript?

I have successfully done code to display a PDF file in the browser instead of the "Open/Save" dialog ... want to implement this functionality using JavaScript. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

82 views

1 answer

How can I replace text with CSS?

How can I replace text with CSS using a method like this: .pvw-title img[src*="IKON.img"] { visibility:hidden; ... ">Facts</div> I need to replace "Facts". Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

188 views

1 answer

php - How do you connect to multiple MySQL databases on a single webpage?

I have information spread out across a few databases and want to put all the information onto one webpage using ... if I do have multiple databases connected. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

160 views

1 answer

facebook: permanent Page Access Token?

I work on a project that has facebook pages as one of its data sources. It imports some data from it ... access-token for server to pull FB page info Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

180 views

1 answer

audio - How can I play sound in Java?

I want to be able to play sound files in my program. Where should I look? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

253 views

1 answer

html - How to call multiple JavaScript functions in onclick event?

Is there any way to use the onclick html attribute to call more than one JavaScript function? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

121 views

1 answer

How do I use prepared statements in SQlite in Android?

How do I use prepared statements in SQlite in Android? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

179 views

1 answer

multithreading - Why is spawning threads in Java EE container discouraged?

One of the first things I've learned about Java EE development is that I shouldn't spawn my own threads inside a ... is the correct way to do it when needed? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

183 views

1 answer

html - What is the HtmlSpecialChars equivalent in JavaScript?

Apparently, this is harder to find than I thought it would be. And it even is so simple... Is there a ... escape() and encodeURI() do not work this way. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

92 views

1 answer

javascript - change type of input field with jQuery

$(document).ready(function() { // #login-box password field $('#password').attr('type', 'text'); $('#password').val('Password ... /> </div> </li> </ol> </form> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

282 views

1 answer

jsp - Using JSF as view technology of Spring MVC

I am currently implementing a small Spring MVC PoC, and I would like to use JSF as the view technology since ... pages. It's basically a time management APP Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

158 views

1 answer

java - When does System.gc() do something?

I know that garbage collection is automated in Java. But I understood that if you call System.gc() in your code that ... a good idea to put this in your code? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

120 views

1 answer

Take the address of a one-past-the-end array element via subscript: legal by the C++ Standard or not?

I have seen it asserted several times now that the following code is not allowed by the C++ Standard: int array[5]; ... from array + 5 or &array[4] + 1? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

156 views

1 answer

python - Why is my pygame application loop not working properly?

This question already has answers here: Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

155 views

1 answer

sql - When should I use CROSS APPLY over INNER JOIN?

What is the main purpose of using CROSS APPLY? I have read (vaguely, through posts on the Internet) that cross ... join Company c on p.companyid = c.companyId Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

199 views

1 answer

swift - Why Choose Struct Over Class?

Playing around with Swift, coming from a Java background, why would you want to choose a Struct instead of ... offering less functionality. Why choose it then? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

81 views

1 answer

python - Understanding the map function

map(function, iterable, ...) Apply function to every item of iterable and return a list of the results. If ... also hard to understand. Too much fancy fluff. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

Categories

Recent questions

Just Browsing Browsing

Most popular tags