Ajax未捕获的SyntaxError:意外的令牌"for"表示 [英] Ajax Uncaught SyntaxError: Unexpected token "for"
问题描述
var dropdownsInsurance = ["home", "claims", "contact"];
$.when(
for (var i = 0; i < dropdownsInsurance.length; i++) {
$.get(dropdownsInsurance[i] + ".svg", function(svg) {
$("#" + dropdownsInsurance[i]).append(svg.documentElement);
});
}
).then(init);
function init() {
alert("svgs have been loaded!");
}
.navLinkContainer {
margin-top: 10px;
width: 25%;
}
svg {
padding: 0;
margin: 0;
width: 100%;
display:block;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<link href="style.css" rel="stylesheet"/>
</head>
<body>
<div id="mainMenu" class="menu">
<div class="navLinkContainer"><a id="home"></a></div>
<div class="navLinkContainer"><a id="claims"></a></div>
<div class="navLinkContainer"><a id="contact"></a></div>
</div>
</div>
</body>
</html>
我不确定在jquery ajax调用时如何在$.内部执行for循环.它不期望"for".这是一个插入链接，允许将外部svg拉入内部. https://plnkr.co/edit/HEcvX7N7Ih29tCNPatw1?p=preview 无论如何，同样的问题.我该怎么做呢?
I am not sure how to do a for loop inside a $.when jquery ajax call. It is not expecting the "for" . Here is a plunker link that allows the external svgs to be pulled inside. https://plnkr.co/edit/HEcvX7N7Ih29tCNPatw1?p=preview Anyway, same problem. How do I do this?
推荐答案
我猜想您想在所有$.get调用完成后运行init函数.为此，您需要将从$.get返回的每个promise作为参数传递给$.when.另外，您不能只将for循环粘贴在这样的函数调用中并期望它能正常工作.
I'm guessing you want your init function to run after all the $.get calls are done. To do this you need to pass each promise returned from $.get to $.when as a parameter. Also, you can't just stick a for loop inside a function call like that and expect it to work.
您需要构建一个承诺数组，然后使用.apply()将其发送到$.when.
You need to build an array of promises, then use .apply() to send them to $.when.
var dropdownsInsurance = ["home", "claims", "contact"];
// Array to hold promises from `$.get` calls
var svg_promises = [];
function init(){
alert("svgs have been loaded!");
}
// Closure to capture each value of `i`.
// Otherwise, `i` will be the same value
// at the end of the loop, because the callbacks
// will run after the `for` is done and will use
// that value of `i`.
function svg_callback(i){
return function(svg){
$("#" + dropdownsInsurance[i]).append(svg.documentElement);
};
}
for(var i = 0; i < dropdownsInsurance.length; i++){
// Add each promise to the array
svg_promises.push($.get(dropdownsInsurance[i] + ".svg", svg_callback(i)));
}
// Call `$.when` with all the promises
$.when.apply($, svg_promises).then(init);
DOCS:
Function.prototype.apply: https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/apply
$.when: http://api.jquery.com/jQuery.when/
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