appendchild

问题 I'm trying to create a new <img> with the <svg> tag with JavaScript every time I click on the button. When I see the result in the console firebug it works correctly, but nothing on screen displays. What I want is for an image <svg> to appear after the last one every time you click the button. Thanks in advance. var svgNS = "http://www.w3.org/2000/svg"; mybtn.addEventListener("click", createCircleSVG); function createCircleSVG(){ var d = document.createElement('svg'); d.setAttribute('id',

问题 I'm having some trouble trying to get a fairly simple popupper to work. The idea is that the parent should open a popup window and then append a div in it. The relevant parts of the code: parent.html : var childWindow; function togglePref() { childWindow = window.open("popup.html", "prefPopup", "width=200,height=320"); } function loadPopupElements() { var prefElements = document.getElementById("prefBrd").cloneNode(true); var childDoc = childWindow.document; var childLink = document

问题 I am trying to include some symbols into a div using JavaScript. It should look like this: x ∈ &reals; , but all I get is: x ∈ &reals; . var div=document.getElementById("text"); var textnode = document.createTextNode("x ∈ &reals;"); div.appendChild(textnode); <div id="text"></div> I had tried document.getElementById("something").innerHTML="x ∈ &reals;" and it worked, so I have no clue why createTextNode method did not. What should I do in order to output the right thing? 回答1: You are

问题 I am trying to add a child element to a parent element as follows: li to be added to ul Either when the enter button is clicked or the enter key on the keyboard is pressed, a new li and delete button should get added to ul . My code isn't working right. Can someone help me with this, please? HTML: <h1>Simple Add/Remove Task</h1> <h2>To do List</h2> <input type="text" placeholder="enter your tasks" id="userInput"> <button id="enter">Enter</button> <ul> <li class="todos">Wake up <button>Delete<

问题 I am trying to add a child element to a parent element as follows: li to be added to ul Either when the enter button is clicked or the enter key on the keyboard is pressed, a new li and delete button should get added to ul . My code isn't working right. Can someone help me with this, please? HTML: <h1>Simple Add/Remove Task</h1> <h2>To do List</h2> <input type="text" placeholder="enter your tasks" id="userInput"> <button id="enter">Enter</button> <ul> <li class="todos">Wake up <button>Delete<

问题 I am trying to add a child element to a parent element as follows: li to be added to ul Either when the enter button is clicked or the enter key on the keyboard is pressed, a new li and delete button should get added to ul . My code isn't working right. Can someone help me with this, please? HTML: <h1>Simple Add/Remove Task</h1> <h2>To do List</h2> <input type="text" placeholder="enter your tasks" id="userInput"> <button id="enter">Enter</button> <ul> <li class="todos">Wake up <button>Delete<

问题 In JavaScript I am creating a grid (the type of grid you see in Photoshop) with HTML tables. The grid size is going to be variable, i.e., changeable by the user, so the size of each grid square must be calculated and divided by the number of pixels available to get an exact size grid. I've done all this, but I have a problem adding in the necessary table elements to create the grid. My code is in full working order, except when I use the appendChild() function inside a for loop it only ever

问题 In JavaScript I am creating a grid (the type of grid you see in Photoshop) with HTML tables. The grid size is going to be variable, i.e., changeable by the user, so the size of each grid square must be calculated and divided by the number of pixels available to get an exact size grid. I've done all this, but I have a problem adding in the necessary table elements to create the grid. My code is in full working order, except when I use the appendChild() function inside a for loop it only ever

问题 I created a Web Component class to extend div , and used customElements.define() to define it: class Resize_Div extends HTMLDivElement { constructor(){ super(); this.cpos = [0,0]; <etc.> } connectedCallback() { console.log( 'connected' ); } <etc.> } customElements.define('resize-div', Resize_Div, { extends:'div'} ); If I test in html, as <div is:'resize-div'> </div> , it works fine. Now I want to use createElement to create an instance programmatically, using the options to declare the is ,

问题 The problem I'm trying to solve is an ad loading script, that loads the ad code with jsonp and inserts it into the dom. Now sometimes the ad code will include javascript tags, and i figured it was just a matter of moving them to the head section and they would run. In theory that works fine but when i made a script to move script tags to the head i ran into some weird behavior. So I wrote this code to test just the script moving part, eliminating the rest of the code as an error source. I get