javascript - Canvases in table, weird padding -


intro:

i'm making website , want make <table/> <canvas/>es in it.

what have done:

i made <table/> <canvas/>es in can draw in them.

<table>     <tr>         <td>item1</td>         <td><canvas></canvas></td>     </tr>     <tr>         <td>item2</td>         <td><canvas></canvas></td>     </tr>     <tr>         <td>item3</td>         <td><canvas></canvas></td>     </tr> </table>

css:

canvas {     margin: 0;     padding: 0;     height: 50px; } table {     margin: 0;     padding: 0;     width: 500px;     border: 0;     border-width: 0;     border-spacing: 0; } tr {     margin: 0;     padding: 0; } td {     margin: 0;     padding: 0;     border: 0;     border-width: 0;     border-spacing: 0;     height: 50px; }

to make canvases appear big box want them hit each other. made code example: http://jsfiddle.net/whb8u/

window.onload = function(){     if(window.addeventlistener){         var items = document.getelementsbytagname('canvas');         for(var = 0; < items.length; i++){             drawcanvas(items[i]);         }     } };  function drawcanvas(item){     var context = item.getcontext("2d");     var canvaswidth = item.parentnode.offsetwidth;     var canvasheight = item.height = item.parentnode.offsetheight;      context.fillstyle = 'rgb(100,100,100)';     context.fillrect(0, 0, canvaswidth, canvasheight);  }

problem:

the canvases don't touch each other. removed table border, margin, padding , spacing.

the canvases need have fixed height of 50px. (in code tried make them hit first, more important height)

but if change size in javascript <td/> around 5px bigger <canvas/>.

does know why happens and/or how fix it?

summary:

the grey boxes don't hit each other. know why happens and/or how fix it? code example: http://jsfiddle.net/whb8u/

per default <canvas/> has it's display property set inline means drawn text. gap see comes fact letters g draw below baseline. 1 way changing display property:

canvas {     display: block; }

see demo.


Comments

Post a Comment

Popular posts from this blog

jquery - How can I dynamically add a browser tab? -

since using iframes house external pages are, accounts "not preferred method" , disallowed sites (flickr, one), want dynamically generate browser tabs. e.g., when user submits form, want dynamically generate tab on browser in response submitted. e.g., might want add new tab url like: http://www.bigsurgarrapata.com/contact how in jquery? you want form target attribute action attribute. http://www.w3schools.com/tags/att_form_target.asp browsers have ultimate control on result of target attribute open new tab value of _blank. <form action="contact_submit.php" target="_blank" method="post">
Read more

keyboard - C++ GetAsyncKeyState alternative -

i using windows.h library's getasynckeystate function define key pushed on keyboard . here program returns int value of pushed key example. #include <iostream> #include <windows.h> using namespace std; int main (){ char i; for(i=8;i<190;i++){ if(getasynckeystate(i)== -32767){ cout<<int (i)<<endl; } } return 0; } but trying make opengl simple game , function appeared slow . there function not need cycle 180 times , if statement . thanks you're trying make opengl game, you're going use glfw. if that's case can away using glfwgetkey() such: if (glfwgetkey(glfw_key_up) == glfw_press) {...} if (glfwgetkey(glfw_key_down) == glfw_press) {...} that method nicely explained in tutorial 6 opengl-tutorial.org . should start first tutorial of beginners tutorials , later intermediate tutorials . if you're going make win32 window can listen wm_keydown or wm_keyup messages , virtua...
Read more

android - java.net.UnknownHostException(Unable to resolve host “URL”: No address associated with hostname) -

i developing app testing asp.net webservice in android.for simple webservice adding 2 numbers used.where numbers passed parameters.the result in dialogue.the webserver works in local. when application runs following result exception.i provided internet permission in manifest. java.net.unknownhostexception(unable resolve host “ http://url.com/ ”: no address associated hostname) my code given below main activity public static string rslt=""; /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); button b1=(button)findviewbyid(r.id.button1); final alertdialog ad=new alertdialog.builder(this).create(); b1.setonclicklistener(new onclicklistener() { @override public void onclick(view arg0) { // todo auto-generated method stub try { ...
Read more