Question

我从web api返回HttpResponseMessage并在ajax调用中使用它，但得到空白的pdf。

我的ajax电话是

function downloadPDF()
    {
        $.ajax({
            type: "POST",
            crossDomain: true,
            data: JSON.stringify(UserData),
            url: rootUrl + "api/WebAPI/Export",
            //dataType: "native",
            contentType: "application/json",
            //responseType: 'arraybuffer',
            //contentType: "application/pdf",

            headers: headers,
            success: function (data) {
                //document.write(data);
                alert(data.size);
                var blob = new Blob([data]);
                var link = document.createElement('a');
                link.href = window.URL.createObjectURL(blob);
                link.download = "Dossier_" + new Date() + ".pdf";
                link.click();
            }
    }

Answer 1

使用此函数将HttpResponseMessage（应为Base64String）转换为Array Buffer：

function base64ToArrayBuffer(base64) {
    var binaryString = window.atob(base64);
    var binaryLen = binaryString.length;
    var bytes = new Uint8Array(binaryLen);
    for (var i = 0; i < binaryLen; i++) {
        var ascii = binaryString.charCodeAt(i);
        bytes[i] = ascii;
    }
    return bytes;
}

然后在转换为Array Buffer后调用此函数：

function saveByteArray(pdfName, byte) {
    var blob = new Blob([byte], { type: "application/pdf" });
    var link = document.createElement('a');
    link.href = window.URL.createObjectURL(blob);
    var fileName = pdfName + ".pdf";
    link.download = fileName;
    link.click();
};

所以你的整个ajax调用将如下所示：

function downloadPDF()
        {
            $.ajax({
                type: "POST",
                crossDomain: true,
                data: JSON.stringify(UserData),
                url: rootUrl + "api/WebAPI/Export",
                //dataType: "native",
                contentType: "application/json",
                //responseType: 'arraybuffer',
                //contentType: "application/pdf",

                headers: headers,
                success: function (data) {
                    //document.write(data);
                    alert(data.size);
                var bytes = base64ToArrayBuffer(data);
                saveByteArray("Dossier_" + new Date(), bytes);

                }
        }

从ajax调用中获取空白pdf，在webapp中返回HttpResponseMessage

1 个答案: