当我从PHP中回显时，jQuery无法正常工作 [英] jQuery not working when I echo it from PHP
问题描述
在php脚本的某些部分中，我只需要运行一些js，出于测试目的，我注释掉了php，因此在这里不再显示.
I need only some js to run during some parts of a php script, for testing purposes I commented out the php so I am not going to show it here.
<!DOCTYPE HTML>
<html>
<head>
<script src="jquery-1.9.1.min.js" type="text/javascript"></script>
</head>
<body>
<?php
echo '<script>
var width = $(window).width();<---Not working down too 1A
var height = $(window).height();
var widthSTR = width.toString();
widthSTR = widthSTR.concat("px");
var heightSTR = height.toString();
heightSTR = heightSTR.concat("px");
heightSTR = " ".concat(heightSTR);
var size = widthSTR.concat(heightSTR);
$("body").css({
"background-size" : size, <---1A and above ^
"background" : "url(p.jpg) 50% 0 no-repeat fixed"<---1B
});
</script>
';
?>
</body>
</html>
我标记为1B的行效果很好，显示背景图像.标为不工作"的部分似乎没有任何效果，但是当我在php之外的Script标记中单独运行它时，效果很好.知道为什么/错过了很多错误吗?预先感谢.
The line I have labeled 1B works fine, the background image displays. The section labeled not working seems to have no effect but when I run it separately in a Script tag outside of the php it works fine. Any idea why/huge mistakes I missed? Thanks in advance.
推荐答案
如果完整的dom依赖于要加载的对象，宽度等的大小，则应在加载完完整的dom后执行您的代码.
Your code should be executed once the full dom has been loaded if it depends on the objects being loaded, which width etc will do.
<!DOCTYPE HTML>
<html>
<head>
<script src="jquery-1.9.1.min.js" type="text/javascript"></script>
</head>
<body>
<?php
echo '<script>
$(document).ready(function(){
var width = $(window).width();<---Not working down too 1A
var height = $(window).height();
var widthSTR = width.toString();
widthSTR = widthSTR.concat("px");
var heightSTR = height.toString();
heightSTR = heightSTR.concat("px");
heightSTR = " ".concat(heightSTR);
var size = widthSTR.concat(heightSTR);
$("body").css({
"background-size" : size, <---1A and above ^
"background" : "url(p.jpg) 50% 0 no-repeat fixed"<---1B
});
});
</script>
';
?>
</body>
</html>
尽管我没有理由仍然需要回显字符串?为什么不直接在回声的HTML内直接包含实际的Javascript?
Although I no reason why you even need to echo out the string anyway? Why not just include the actual Javascript directly inside the HTML with the echo?
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