foreach 相当于 jquery 中的 php？
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foreach equivalent of php in jquery?
提问by Angeline
Is there a foreach code in JQuery as in PHP? I have a code in php,like
JQuery 中有没有像 PHP 一样的 foreach 代码？我在 php 中有一个代码，比如
<?php foreach ($viewfields as $viewfield): ?>
if("<?php echo $viewfield['Attribute']['required'];?>"=='true'){
$("<span class='req'><em> * </em></span>").appendTo("#fb_contentarea_col1down21 #label<?php echo $viewfield['Attribute']['sequence_no']?>");
}
if(<?=$viewfield['Attribute']['type'];?>=='text'||<?=$viewfield['Attribute']['type'];?>=='date'||<?=$viewfield['Attribute']['type'];?>=='number'){
$("<input id=input<?=$viewfield['Attribute']['sequence_no'];?> type= 'text' style= 'width:<?=$viewfield['Attribute']['size'];?>px' data-attr=<?=$viewfield['Attribute']['type'];?> ></input><br>").appendTo("#fb_contentarea_col1down21 #<?=$viewfield['Attribute']['sequence_no'];?>");
}
else if(<?=$viewfield['Attribute']['type'];?>=='textarea'){
$("<textarea style= 'width:<?=$viewfield['Attribute']['size'];?>px' data-attr=<?=$viewfield['Attribute']['type'];?> id=input<?=$viewfield['Attribute']['sequence_no'];?>></textarea><br>").appendTo("#fb_contentarea_col1down21 #<?=$viewfield['Attribute']['sequence_no'];?>");
}
Is there any equivalent of foreach in Jquery? How can I accomplish this same functioality in jQuery?
在 Jquery 中是否有任何等效的 foreach？我怎样才能在 jQuery 中完成同样的功能？
EDIT 1:
编辑 1：
I thought it worked but I get an error. The code and the error message is given below.
我认为它有效，但出现错误。下面给出了代码和错误消息。
for(<?=$viewfield;?> in <?=$viewfields;?>){
if("<?=$viewfield['Attribute']['required'];?>"=='true'){
$("<span class='req'><em> * </em></span>").appendTo("#fb_contentarea_col1down21 #label<?php echo $viewfield['Attribute']['sequence_no']?>");
}
if(<?=$viewfield['Attribute']['type'];?>=='text'||<?=$viewfield['Attribute']['type'];?>=='date'||<?=$viewfield['Attribute']['type'];?>=='number'){
$("<input id=input<?=$viewfield['Attribute']['sequence_no'];?> type= 'text' style= 'width:<?=$viewfield['Attribute']['size'];?>px' data-attr=<?=$viewfield['Attribute']['type'];?> ></input><br>").appendTo("#fb_contentarea_col1down21 #<?=$viewfield['Attribute']['sequence_no'];?>");
}
else if(<?=$viewfield['Attribute']['type'];?>=='textarea'){
$("<textarea style= 'width:<?=$viewfield['Attribute']['size'];?>px' data-attr=<?=$viewfield['Attribute']['type'];?> id=input<?=$viewfield['Attribute']['sequence_no'];?>></textarea><br>").appendTo("#fb_contentarea_col1down21 #<?=$viewfield['Attribute']['sequence_no'];?>");
}
}
}
Error message:
错误信息：
syntax error for( in Array)
语法错误 for( in Array)
Can someone help me..
有人能帮我吗..
回答by CMS
The $.eachfunction is similar.
该$。每个功能类似。
It allows you to iterate arrays using a callback function where you have access to each item:
它允许您使用可以访问每个项目的回调函数来迭代数组：
var arr = [ "one", "two", "three", "four", "five" ];
$.each(arr, function(index, value) {
// work with value
});
Maybe is useful to know, if you want to break the loop, you can do it with return false;or if you want to skip only one iteration (continue), you return true;
知道可能很有用，如果你想打破循环，你可以这样做，return false;或者如果你只想跳过一次迭代（继续），你return true;
回答by Blixt
If you want to iterate an object, I would recommend the JavaScript variant:
如果你想迭代一个对象，我会推荐 JavaScript 变体：
for (var key in obj) {
alert(key + ': ' + obj[key]);
}
You canalso iterate objects in jQuery like this:
Note!Doing this is pretty pointless unless you think this syntax is much simpler to maintain. The below syntax has much more overhead than the above, standard JavaScript, for-loop.
您还可以像这样在 jQuery 中迭代对象：
注意！除非您认为这种语法易于维护，否则这样做毫无意义。下面的语法比上面的标准 JavaScript for 循环有更多的开销。
$.each(obj, function (key, value) {
alert(key + ': ' + value);
});
To iterate arrays, this is how you do it in standard JavaScript (assuming arris the array):
要迭代数组，这是在标准 JavaScript 中执行的方法（假设arr是数组）：
for (var i = 0, l = arr.length; i < l; i++) {
alert(i + ': ' + arr[i]);
}
To do it in jQuery, you can do it like this:
要在 jQuery 中执行此操作，您可以这样做：
$.each(arr, function (index, value) {
alert(index + ': ' + value);
});
回答by Torandi
Javascript supports the for(data in data_array)syntax. jQuery also has a $.each function (as already mentioned)
Javascript 支持for(data in data_array)语法。jQuery 还有一个 $.each 函数（如前所述）
回答by Chetan Sastry
There is jQuery.each.
回答by meder omuraliev
Jquery operating on selectors:
Jquery 操作选择器：
$('a').each(function() {
$(this).click(function(e) {
e.preventDefault()
var href = this.href;
open(href);
});
// operate on the anchor node.
});
jQuery direct $.each:
jQuery 直接 $.each：
var a = ['one', 'two'];
$.each(a, function() {
alert(this)
});
JS: Vanilla for loop
JS：香草 for 循环
for ( var i = 0, len = 10; i<l; ++i ) {
alert(i)
}
JS #2: vanilla for
JS #2：香草
var humanLimbs = ['arms', 'legs'];
for ( var limb in humanLimbs ) {
if ( humanLimbs.hasOwnProperty(limb) ) {
alert( limb )
}
}
Js #3: infinite loop
Js #3：无限循环
for (;;) { alert(1) } // dont try this :p
