如何在反应羽毛笔图像处理程序中访问道具

问题描述

我正在为我的项目使用React Quill编辑器，并使用后端服务器上传图像，但是我需要访问react Quill的图像处理程序中的道具，而我无法这样做，因为无法访问Image Handler中的该对象。 这是我的编辑器代码。

<ReactQuill
  ref={(el) => (this.quillRef = el)}
  onChange={this.handleChange}
  placeholder={"share your thoughts"}
  modules={{
    toolbar: {
      container: [
        [{ header: "1" },{ header: [2,3,4,5,6] },{ font: [] }],[{ size: ["small",false,"large","huge"] }],["bold","italic","underline","strike","blockquote"],[{ list: "ordered" },{ list: "bullet" }],["link","image","video"],["clean"],["code-block"],[{ color: [] },{ background: [] }],// dropdown with defaults from theme

        [{ align: [] }],],handlers: {
        image: this.imageHandler,},}}
/>;

function imageHandler() {
  let self = this;
  let image;
  let image_extension;
  const Cryptr = require("cryptr");
  const cryptr = new Cryptr(key);
  const users = localStorage.getItem("users")
    ? JSON.parse(cryptr.decrypt(localStorage.getItem("users")))
    : {};
  // console.log(users[users.lastLoginId])
  let loggedinUser = users[users.lastLoginId];
  const input = document.createElement("input");

  input.setAttribute("type","file");
  input.setAttribute("accept","image/*");
  input.setAttribute("class","Editor-mage");
  input.click();

  input.onchange = async () => {
    //debugger
    const file = input.files[0];

    var ValidImageTypes = [
      "image/gif","image/jpeg","image/png","image/jpg","image/GIF","image/JPEG","image/PNG","image/JPG",];
    let file_type = file.type;
    let filename = file.name;
    let extension = filename.split(".").pop();
    if (ValidImageTypes.indexOf(file_type) >= 0) {
      if (true) {
        var fileToLoad = file;

        loadImage(
          fileToLoad,(canvas) => {
            if (canvas) {
              // this.setState({
              image = canvas.toDataURL();
              image_extension = extension;
              //});

              const res = new Promise(function (resolve,reject) {
                axios({
                  method: "post",url: API_URL + "api/v1/postblogimage",headers: {
                    "x-access-handler": loggedinUser.token,data: {
                    image: image,image_extension: image_extension,userid: loggedinUser.userid,})
                  //axios.post(API_URL + 'api/v1/postblogimage',formData,config)
                  .then((response) => {
                    //debugger
                    if (
                      response.data.error == "false" ||
                      response.data.error == false
                    ) {
                      if (
                        response.data.status == 200 &&
                        response.data.message == "Image uploaded successfully"
                      ) {
                        //debugger
                        const range = self.quill.getSelection(true);

                        // Insert temporary loading placeholder image
                        // this.quill.insertEmbed(range.index,'image',`${window.location.origin}/images/loaders/placeholder.gif`);

                        // Move cursor to right side of image (easier to continue typing)
                        self.quill.setSelection(range.index + 1);

                        // Remove placeholder image
                        self.quill.deleteText(range.index,1);

                        // Insert uploaded image
                        let url = response.data.data[0].imageURL;
                        self.quill.insertEmbed(range.index,url);
                        self.quill.pasteHTML(
                          range.index,<img
                            src={url}
                            class="blog-image-content"
                            alt="Responsive image"
                          />
                        );
                      }
                    }

                    // }
                  })
                  .catch((error) => {
                    // reject(Error("It broke"));
                  });
              });
            }
          },{ orientation: true }
        );
      } else {
        // this.setState({
        // image_warning:'File size larger than maximum allowed limit',image = "";
        image_extension = "";
        // })
        this.fileInput.value = "";
      }
    } else {
    }
  };
}

有人在这个问题上困扰了我很久吗，可以帮我这个忙吗？ 任何帮助和建议将不胜感激。

解决方法

我认为您可以使用高阶函数。

image: this.imageHandler(props)
...
function imageHandler(props) {
  return function() {
    let self = this;
    let image;
    ...
  }
}

,

我阅读了Quilljs的文档。

Handler functions will be bound to the toolbar (so using this will refer to the toolbar instance) and passed the value attribute of the input if the corresponding format is inactive,and false otherwise. Adding a custom handler will overwrite the default toolbar and theme behavior.

，发现imageHandler将在工具栏的上下文中被调用，因此this.props在调用时将无法正常工作。

要获得对道具的访问权限，您可以执行以下操作：

handlers: {
    image: (val) => this.imageHandler({ val,componentProps: this.props });
  }

在imageHandler中，您可以像这样访问它：

function imageHandler({ val,componentProps }) {
  // componentProps has all your propss,try to print it and see
  // rest of your code,instead of this.props.something take componentProps.something
}

让我知道是否有帮助。谢谢