权限没有,则隐藏 function forum_list_access_filter($forumlist, $gid, $allow = 'allowread') { global $grouplist; if (empty($forumlist)) return array(); if (1 == $gid) return $forumlist; $forumlist_filter = $forumlist; $group = $grouplist[$gid]; foreach ($forumlist_filter as $fid => $forum) { if (empty($forum['accesson']) && empty($group[$allow]) || !empty($forum['accesson']) && empty($forum['accesslist'][$gid][$allow])) { unset($forumlist_filter[$fid]); } unset($forumlist_filter[$fid]['accesslist']); } return $forumlist_filter; } function forum_filter_moduid($moduids) { $moduids = trim($moduids); if (empty($moduids)) return ''; $arr = explode(',', $moduids); $r = array(); foreach ($arr as $_uid) { $_uid = intval($_uid); $_user = user_read($_uid); if (empty($_user)) continue; if ($_user['gid'] > 4) continue; $r[] = $_uid; } return implode(',', $r); } function forum_safe_info($forum) { //unset($forum['moduids']); return $forum; } function forum_filter($forumlist) { foreach ($forumlist as &$val) { unset($val['brief'], $val['announcement'], $val['seo_title'], $val['seo_keywords'], $val['create_date_fmt'], $val['icon_url'], $val['modlist']); } return $forumlist; } function forum_format_url($forum) { global $conf; if (0 == $forum['category']) { // 列表URL $url = url('list-' . $forum['fid'], '', FALSE); } elseif (1 == $forum['category']) { // 频道 $url = url('category-' . $forum['fid'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = url('read-' . trim($forum['brief']), '', FALSE); } if ($conf['url_rewrite_on'] > 1 && $forum['well_alias']) { if (0 == $forum['category'] || 1 == $forum['category']) { $url = url($forum['well_alias'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = ($forum['threads'] && $forum['brief']) ? url($forum['well_alias'] . '-' . trim($forum['brief']), '', FALSE) : url($forum['well_alias'], '', FALSE); } } return $url; } function well_forum_alias() { $forumlist = forum_list_cache(); if (empty($forumlist)) return ''; $key = 'forum-alias'; static $cache = array(); if (isset($cache[$key])) return $cache[$key]; $cache[$key] = array(); foreach ($forumlist as $val) { if ($val['well_alias']) $cache[$key][$val['fid']] = $val['well_alias']; } return array_flip($cache[$key]); } function well_forum_alias_cache() { global $conf; $key = 'forum-alias-cache'; static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存,跨进程需要再加一层缓存:redis/memcached/xcache/apc if (isset($cache[$key])) return $cache[$key]; if ('mysql' == $conf['cache']['type']) { $arr = well_forum_alias(); } else { $arr = cache_get($key); if (NULL === $arr) { $arr = well_forum_alias(); !empty($arr) AND cache_set($key, $arr); } } $cache[$key] = empty($arr) ? '' : $arr; return $cache[$key]; } ?>html - How can I change the border colour of a <td> using JavaScript? - Stack Overflow
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html - How can I change the border colour of a <td> using JavaScript? - Stack Overflow

programmeradmin6浏览0评论

I'm trying to change the colour of a <td> in my .html file. Here is what I have but for some reason it doesn't seem to be working.

My .html file:

<table>
    <tr id = "table_row">
        <td>Computers</td>
        <td>Price</td>
        <td>Location</td>
   </tr>
</table>

And now my .js file:

function changeBorderColor() {
    var table = document.getElementById("table_row").getElementsByTagName("td");
    table.style.borderColor = "red";
}

Why doesn't my <td> change colour when I activate the changeBorderColor() function? Thanks in advance for any tips and help!

I'm trying to change the colour of a <td> in my .html file. Here is what I have but for some reason it doesn't seem to be working.

My .html file:

<table>
    <tr id = "table_row">
        <td>Computers</td>
        <td>Price</td>
        <td>Location</td>
   </tr>
</table>

And now my .js file:

function changeBorderColor() {
    var table = document.getElementById("table_row").getElementsByTagName("td");
    table.style.borderColor = "red";
}

Why doesn't my <td> change colour when I activate the changeBorderColor() function? Thanks in advance for any tips and help!

Share Improve this question edited Jul 15, 2017 at 16:47 Brian Tompsett - 汤莱恩 5,89372 gold badges61 silver badges133 bronze badges asked Jan 27, 2015 at 20:33 The ManThe Man 891 silver badge10 bronze badges 3
  • getElementsByTagName is a NodeSet – epascarello Commented Jan 27, 2015 at 20:35
  • Also, how do you call changeBorderColor? – j08691 Commented Jan 27, 2015 at 20:36
  • Are you using jQuery by chance? Or are you limited to using vanilla JavaScript? – Josh Taylor Commented Jan 27, 2015 at 20:39
Add a ment  | 

4 Answers 4

Reset to default 4

The getElementsByTagName() method will return an array of elements matching the tag selector. So you would need to iterate througth it to change each element:

Simple example:

function changeBorderColor() {
    var table = document.getElementById("table_row").getElementsByTagName("td");
    for(var i=0; i<table.length; i++) {
        var td = table[i];
        td.style.borderColor = "red";
    }
}

.getElementsByTagName("td") returns a NodeList, you will have to loop through each td and assign the border individually.

You also need to specify the borderWidth and borderStyle properties.

function changeBorderColor() {
  var td = document.getElementById("table_row").getElementsByTagName("td");
  for (i = 0; i < td.length; i++) {
    td[i].style.borderColor = "red";
    td[i].style.borderWidth = "1px";
    td[i].style.borderStyle = "solid";
  }
}
changeBorderColor()
<table>
  <tr id="table_row">
    <td>Computers</td>
    <td>Price</td>
    <td>Location</td>
  </tr>
</table>

You can use some Jquery here.For example:

function changeBackground(){

$("td").css("border","2px solid red");

}

If you are allowed to use jQuery, here is a slightly more verbose example:

$('#table_row td').each(function(index){

   //Do something with each result. In this case - add a border
   $(this).css({ 'border': '1px solid red' });

});

Here is a fiddle for the jQuery example: http://jsfiddle/k3d6peLy/

Alternatively, if you don't have to worry about supporting anything before IE8, you could also use JavaScript's 'querySelectorAll()' method:

var elements = document.querySelectorAll('#table_row td');

for(var i = 0; i < elements.length; i++){
    elements[i].style.border = '1px solid red';
}

Here is a fiddle for the 'querySelectorAll()' example: http://jsfiddle/k3d6peLy/1/

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