#pragma GCC diagnostic warning "-Wcpp"

#pragma GCC diagnostic push
    #pragma GCC diagnostic warning "-Wcpp"
    #warning one
    #pragma GCC diagnostic pop

    #warning two

warning-test.c:3:2: warning: #warning one [-Wcpp]
    warning-test.c:6:2: error: #warning two [-Werror=cpp]
    cc1: all warnings being treated as errors

const allowedTypes = new Set(['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet','application/vnd.ms-excel']);
document.querySelector('input[type=file]').addEventListener('change',function(){
  if(!allowedTypes.has(this.files[0].type)){
    console.log("Not a CSV file");
    this.value = '';//clear the input for invalid file
  } else {
    console.log("CSV file");
  }
});

<input type="file" accept=".csv,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/vnd.ms-excel">

请注意，csv文件具有许多MimeType，因此您应该检查多个 "application/vnd.ms-excel" => .CSV Mimetypes，您可以在客户端进行检查 以及通过将文件类型与可接受类型的数组进行比较 这样您就可以添加或删除适合您需求的方式

// the list of the accepted types since we need it always it's better to
// make it global instead of local to the onchange litener,and even you can
// add other types dynamically as well;
const acceptedTypes = ["text/csv","text/x-csv","application/x-csv","application/csv","text/x-comma-separated-values","text/comma-separated-values","application/vnd.openxmlformats-officedocument.spreadsheetml.sheet","application/vnd.ms-excel"];
document.querySelector("[type='file']").onchange = function() {
  if(!acceptedTypes.includes(this.files[0].type)) {
    console.log("This file is not allowed for upload");
    // if the file is not allowed then clear the value of the upload element
    this.value = "";
  }
};

如果仅在用户拖放文件时希望这种行为，则可以像这样自定义

const acceptedTypes = ["text/csv","application/vnd.ms-excel"];
// global variable to hold if the user has dragged the file or not
let isDragged = false;
// the `ondragover` gets triggered before the `onchange` event so it works as expected
document.querySelector("[type='file']").ondragover = function() {
  isDragged = true;
};
document.querySelector("[type='file']").onchange = function() {
  // if there was no drag then do nothing
  if(!isDragged) return;
  if(!acceptedTypes.includes(this.files[0].type)) {
    console.log("This file is not allowed for upload");
    // if the file is not allowed then clear the value of the upload element
    this.value = "";
  }
  isDragged = false;
};

您只需要添加一个事件监听器和函数来接受或拒绝该文件：

fileInput.addEventListener("change",func);

var func = function() {
  if(fileInput.files[0].type == /*insert your file types here*/) {
    //accept file and do stuff with it
  } else {
    //reject and tell user that is was rejected and why
  }
}

我不确定这是否适用于拖放文件输入，但我知道它适用于常规类型。每当文件更改时，都会调用change事件。

angularjs – 我该怎么做才能获得使用UI-Grid在屏幕上显示的行

rowTemplate: '<div ng-repeat="(colRenderIndex,col) in colContainer.renderedColumns track by col.uid" ui-grid-one-bind-id-grid="roWrenderIndex + \'-\' + col.uid + \'-cell\'"ng-role="{{col.isRowHeader ? \'rowheader\' : \'gridcell\'}}" ui-grid-cell viewport-enter="" viewport-leave=""></div>'

$scope.$on('ngGridEventData',function (event) {
    console.log(event.targetScope.renderedRows);
});

var gridApi;
gridOptions = {
    //...
    onRegisterapi: function (api) {

        gridApi = api;

    }
}

gridApi.grid.renderContainers.body.renderedRows

c# – 为什么在这种情况下编译器不会抱怨？

private TreeNode GetTopLevelNode(TreeNode childNode)
    {
        if (childNode == null)
            throw new ArgumentNullException("childNode","childNode is null.");

        if (childNode.Parent == null) return childNode;

        TreeNode node = childNode;
        while (true)
        {
            if (node.Parent == null)
            {
                return node;
            }
            node = node.Parent;
        }

    }

fhir.executeBundle 替换资源 ID...如何防止这种情况？

当您执行交易时，效果将与单独发布资源相同。在 POST 中，服务器 确定资源 ID。在常规 POST 中，id 只是被忽略或引发错误。在事务中，id 用于管理跨事务的引用解析，但服务器仍然选择持久资源的 id（并相应地更新所有引用）。如果要控制事务中的资源 ID 值，请使用 PUT 而不是 POST。 （请注意，并非所有服务器都允许“更新插入” - 即在特定资源位置执行创建的 PUT。）有关详细信息，请参阅 http://hl7.org/fhir/http.html#upsert。

关于-Werror导致编译器在#warning上停止.我该怎么做才能防止这种情况发生？和编译出现warning的问题就给大家分享到这里，感谢你花时间阅读本站内容，更多关于接受属性在拖放文件时将被忽略，如何防止这种情况？、angularjs – 我该怎么做才能获得使用UI-Grid在屏幕上显示的行、c# – 为什么在这种情况下编译器不会抱怨？、fhir.executeBundle 替换资源 ID...如何防止这种情况？等相关知识的信息别忘了在本站进行查找喔。