parent-child | 易学教程

What happens to a SIGINT (^C) when sent to a perl script containing children?

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I have a Perl script that forks. Each fork runs an external program, parses the output, and converts the output to a Storable file. The Storable files are then read in by the parent and the total data from each of the children are analyzed before proceeding onto a repeat of the previous fork or else the parent stops. What exactly happens when I issue a ^C while some of the children are still running the external program? The parent perl script was called in the foreground and, I presume, remained in the foreground despite the forking. Is the SIGINT passed to all children, that is, the parent,

How to find parent elements by python webdriver?

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问题 Is there any methods for python+selenium to find parent elements, brother elements, or child elements just like driver.find_element_parent? or driver.find_element_next? or driver.find_element_previous ? eg: <tr> <td> <select> <option value=0, selected='selected'> </option> <option value=1, > </option> <option value=2,> </option> </select> </td> <td> 'abcd' <input name='A'> </input> <td> <tr> I've tried like below, but fail: input_el=driver.find_element_by_name('A') td_p_input=find_element_by

How to vary between child and parent view group touch events

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I decided to post this question and answer in response to this comment to this question: How to handle click in the child Views, and touch in the parent ViewGroups? I will paste the comment here: Suppose I want to override the touch events only for handling some of the children, what can I do inside this function to have it working ? I mean, for some children it would work as usual, and for some, the parent-view will decide if they will get the touch events or not. So the question is this: How do I prevent the parent onTouchEvent() from overriding some child elements' onTouchEvent() , while

Use javascript to count immediate child elements of an element

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问题 I can get the count of all descendants of an element, but I can't seem to target just the immediate children. Here's what I have at the moment. var sectionCount = document.getElementById("window").getElementsByTagName("section").length; I've played with other stuff and different syntax, but I can't seem to get it. The jQuery equivalent would be: var sectionCount = $("#window > section").length; But I need to do this javascript only. 回答1: Use the DOM selector interface (querySelectorAll). var

JavaScript mouseover/mouseout issue with child element

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问题 I have this little problem and I am requesting for your help. I have a div element, inside which I have an img element, like this <div id="parent" onmouseover="MyFuncHover()" onmouseout="MyFuncOut()"> <img id="child" src="button.png" style="visibility: hidden" /> </div> <script type="text/javascript"> function MyFuncHover() { // Here I have some code that makes the "child" visible } function MyFuncOut() { // Here I have some code that makes the "child" invisible again } </script> As you, see,

How to set default child view with Angular UI Router

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问题 Let's say I have the following 3 Angular UI Router states: $stateProvider .state('adminCompanies', { abstract: true, url: "/admin/companies", template: '<div ui-view class="viewContainer" autoscroll="false" />' }) .state('adminCompanies.list', { url: "", templateUrl: 'app/admin/companies/companies.list.html', controller: 'AdminCompaniesController' }) .state('adminCompanies.detail', { url: "/:companyId", templateUrl: 'app/admin/companies/companies.detail.html', resolve: { company: function

Generics and Parent/Child architecture

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问题 I'm building an architecture with inheritable generics and parent-children relations. I have one major problem: I can't make both the child and the parent aware of each other's type, only one of the two. I need both the child and the parent to be aware of each other's type. Scenario 1 : Parent knows child type, but child only knows generic parent with generic children. public class Child { public Parent<Child> Parent; } public class Parent<TChild> where TChild : Child { public List<TChild>

How to select <td> of the <table> with javascript?

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问题 I know this is very easy question, but I couldn't find the answer anywhere. Only answers are the ones using jQuery, not pure JS. I've tried the code below and it doesn't work. I don't know why. var t = document.getElementById("table"), d = t.getElementsByTagName("tr"), r = d.getElementsByTagName("td"); This also doesn't work: var t = document.getElementById("table"), d = t.getElementsByTagName("tr"), r = d.childNodes; What am I doing wrong? What is the best way to do this? EDIT: I indeed have

How to recursively populate a TreeView with JSON data

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I have a winforms treeview, I can read data automatically, (a node that is equal to key, and a node inside that is equal to value), but when reading object type, the values inside it are not going to be child of object node (key of object), (maybe I couldnt explain well, here is a screenshot and my methods.) layer0 needs to be inside textures and scale needs to be inside display My Json: { "parent": "builtin/generated", "textures": { "layer0": "mm:items/iron_dust" }, "display": { "scale": [ 1.7, 1.7, 1.7 ] } } My method to auto detect(not all mine actually) private void Form1_Load(object

Convert PHP array to JSON tree

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I have got a array in this format: array( array('id' => 1, 'parent_id' => null, 'name' => 'lorem ipsum'), array('id' => 2, 'parent_id' => 1, 'name' => 'lorem ipsum1'), array('id' => 3, 'parent_id' => 1, 'name' => 'lorem ipsum2'), array('id' => 4, 'parent_id' => 2, 'name' => 'lorem ipsum3'), array('id' => 5, 'parent_id' => 3, 'name' => 'lorem ipsum4'), array('id' => 6, 'parent_id' => null, 'name' => 'lorem ipsum5'), ); I have to convert this array to json object with this style: var json = { id: "1", name: "loreim ipsum", data: {}, children: [{ id: "2", name: "lorem ipsum1", data: {}, children: