Question

我多次测试以下代码。效果很好，我得到的结果是＆＃34;返回photoMenu_sb.ToString（）;＆＃34;一旦我删除字符串参数photoFileName。但是当我声明并尝试传递字符串photoFileName时没有任何反应。为什么？

我认为问题在于将字符串photoFileName声明并传递给javascript函数但我无法识别问题，因为我没有收到任何错误。在某处有没有遗漏的引文？

[WebMethod]
public static string LoadPhotosPopup(int offset, int fetch, string IDuserInput)
{
        StringBuilder photosPopup_sb = new StringBuilder();           
        var photosPopup_query = db.Query("SELECT IDphoto], [photoFileName] FROM [photos] WHERE ([IDuser] = @0 AND [photoPublished] = 'True')  ORDER BY [photoDate] DESC OFFSET @1 ROWS FETCH NEXT @2 ROWS ONLY", IDuserInput, offset, fetch);
        foreach (var item in photosPopup_query)
        {
            var IDphoto = item.IDphoto;
            var photoFileName = item.photoFileName;
            photosPopup_sb.Append("<img src=\"Images/Design/openmenu.png\" onclick=\"photoMenu(" + IDphoto + ", '" + photoFileName + "') \" />");                         
         }           
        return photosPopup_sb.ToString();
    }

的JavaScript

function photoMenu(IDphoto, photoFileName) {   
$.ajax({
    type: "POST",
    url: "UserControls/photosFunctions.aspx/photoMenu",
    data: "{ IDphoto: " + IDphoto + "}",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (data) {
        $("#CommentsMenu" + IDphoto).html(data.d);
    }
})

}

[WebMethod]
            {   StringBuilder photoMenu_sb = new StringBuilder();                        
        photoMenu_sb.Append("<label>Testing </label>");
        return photoMenu_sb.ToString();
    }

UPDATE 自公共静态字符串photoMenu（int IDphoto，string photoFileName）期待2个参数

 data: "{ IDphoto: " + IDphoto + "}", in the javascript function should be 
 data: "{ IDphoto: " + IDphoto + ", photoFileName: '" + photoFileName + "'}",

Answer 1

尝试创建一个包含javascript函数字符串的字符串变量：

var img = String.Format("<img src='Images/Design/openmenu.png' onclick='photoMenu({0},'{1}')' />", item.IDphoto, item.photoFileName);
photosPopup_sb.Append(img);

在JavaScript中，您还需要为photofileName参数设置json数据属性：

function photoMenu(IDphoto, photoFileName) {   
    $.ajax({
        type: "POST",
        url: "UserControls/photosFunctions.aspx/photoMenu",
        data: "{ IDphoto: " + IDphoto + ", photoFileName: '" + photoFileName + "'}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (data) {
           $("#CommentsMenu" + IDphoto).html(data.d);
        }
    }); 
}

Answer 2

我认为你错过了一个括号＆＃34;）＆＃34;：

photosPopup_sb.Append("<img src=\"Images/Design/openmenu.png\" onclick=\"photoMenu(" + IDphoto + ", '" + photoFileName + "')\" />");

Answer 3

我没有看到photoFileName的示例值，但如果它有反斜杠，则可能必须确保该字符串已正确转义。

例如：

//causes errors
called(1, 'file\path\img.png');

//successful
called(1, 'file/path/img.png');

将字符串参数传递给javascript函数

3 个答案: