Reactjs 此代码如何将发送按钮与函数关联,以及如何制作另一个按钮?
两个问题:我正在研究spfx,对于这个特定的示例,我不理解Send按钮如何与setComment()函数相关联。我已经创建了一个更新按钮,我想用它来更新我刚刚创建的项目。即使我已经将道具传递给它,它也不会起任何作用(可能是错误的!) 对于更新按钮,我尝试使用React在JSX中使用onClick传递道具,但这不起作用。我也尝试过在没有美元的情况下这样做。我创建了一组单独的函数_readListItem()和_getListItem(),以帮助我,但不确定如何将它们与_updateListItem()结合使用,或者我是否需要它们Reactjs 此代码如何将发送按钮与函数关联,以及如何制作另一个按钮?,reactjs,typescript,sharepoint-online,spfx,Reactjs,Typescript,Sharepoint Online,Spfx,两个问题:我正在研究spfx,对于这个特定的示例,我不理解Send按钮如何与setComment()函数相关联。我已经创建了一个更新按钮,我想用它来更新我刚刚创建的项目。即使我已经将道具传递给它,它也不会起任何作用(可能是错误的!) 对于更新按钮,我尝试使用React在JSX中使用onClick传递道具,但这不起作用。我也尝试过在没有美元的情况下这样做。我创建了一组单独的函数_readListItem()和_getListItem(),以帮助我,但不确定如何将它们与_updateListItem
import { Environment, EnvironmentType, Version } from '@microsoft/sp-core-library';
import { ISPHttpClientOptions, SPHttpClient, SPHttpClientResponse } from '@microsoft/sp-http';
import { escape } from '@microsoft/sp-lodash-subset';
import { BaseClientSideWebPart, IPropertyPaneConfiguration, PropertyPaneTextField } from '@microsoft/sp-webpart-base';
import * as strings from 'FeedbackWebpartWebPartStrings';
import styles from './FeedbackWebpart.module.scss';
import { IFeedbackWebPartProps } from './IFeedbackWebPartProps';
import {ISPListItem} from './ISPListItem';
export default class FeedbackWebpartWebPart extends BaseClientSideWebPart<IFeedbackWebPartProps> {
public render(): void {
this._updateListItem = this._updateListItem.bind(this);
this._readListItem = this._readListItem.bind(this);
this.domElement.innerHTML = `
<div>
<p class='${styles.titleText}'>Job Evaluation Form</p>
<i class='ms-Icon ms-Icon--NoteForward' aria-hidden='true'></i>
<p class='${styles.labelText}'>Name</p>
<input type='text' class='${styles.input}' maxlength='255' placeholder='${escape(this.properties.hintText)}' />
<br>
<br>
<p class='${styles.labelText}'>Job Title</p>
<input type='text' class='${styles.input}' maxlength='255' placeholder='${escape(this.properties.hintText)}' />
<br>
<p class='${styles.successIndicator}'></p>
<br>
<br>
<br>
<button type='button' class='ms-Button'><span class='ms-Button-label'>Send</span></button>
<br>
<br>
<button type='button' class='ms-Button' onClick='${this._updateListItem}'><span class='ms-Button-label'>Update</span></button>
</div>`;
//The binding below allows setComment to be used in the render and outside of it.
this.setComment = this.setComment.bind(this);
this._updateListItem = this._updateListItem.bind(this);
this._readListItem = this._readListItem.bind(this);
//Grab ALL the <input> elements
// [0] - just want the first element
// cast this generic element to specific type of element (which I know that it is) as the variable is expecting a specific type
const textInput: HTMLInputElement = this.domElement.getElementsByTagName("INPUT") [0] as HTMLInputElement;
// setComment is used in an event listener here to be called upon whenever a user types into this input field.
textInput.addEventListener("keyup", this.setComment);
this.sendFeedback = this.sendFeedback.bind(this);
const submitbutton: HTMLButtonElement = this.domElement.getElementsByTagName("BUTTON") [0] as HTMLButtonElement;
submitbutton.onclick = this.sendFeedback;
submitbutton.disabled = true;
}
private _updateListItem(): void {
const url: string = this.context.pageContext.site.absoluteUrl+"/_api/web/lists/getbytitle('Feedback')/items(1)";
const itemDefinition : any = {
"Title" : "Modified title field value!"};
const headers:any = {
"X-HTTP-Method":"MERGE",
"IF-MATCH": "*",
};
const spHttpClientOptions: ISPHttpClientOptions = {
"headers": headers,
"body": JSON.stringify(itemDefinition)
};
this.context.spHttpClient.post(url, SPHttpClient.configurations.v1,spHttpClientOptions)
.then((response: SPHttpClientResponse) => {
if (response.status === 204) {
this._operationResults.innerHTML = "Update: List Item updated successfully.";
} else {
this._operationResults.innerHTML = "Update: List Item update failed. " +response.status+" - "+response.statusText;
}
});
}
private sendFeedback(): void {
this.context.statusRenderer.clearError(this.domElement);
const paragraphElement: HTMLParagraphElement = this.domElement.getElementsByClassName(styles.successIndicator) [0] as HTMLParagraphElement;
paragraphElement.innerHTML="";
if(this._commentText === undefined || this._commentText.length === 0) {
this.context.statusRenderer.renderError(this.domElement, "Please type in a comment or a suggestion.");
return;
}
if(Environment.type === EnvironmentType.Local) {
this.context.statusRenderer.renderError(this.domElement, "Feedback can't be saved when running in local workbench");
return;
}
const url: string = this.context.pageContext.site.absoluteUrl+"/_api/web/lists/getbytitle('Feedback')/items";
const item : any = {
"Title": this._commentText,
"URL": window.location.href,
"JobTitle": this._jobTitle
};
const spHttpClientOptions: ISPHttpClientOptions = {
"body": JSON.stringify(item)
};
从'@microsoft/sp core library'导入{Environment,EnvironmentType,Version};
从“@microsoft/sp http”导入{ISPHttpClientOptions,SPHttpClient,SPHttpClient响应};
从'@microsoft/sp lodash subset'导入{escape};
从'@microsoft/sp webpart base'导入{BaseClientSideWebPart,IPropertyPaneConfiguration,PropertyPaneTextField};
从“FeedbackWebPartWebPartString”导入*作为字符串;
从“./FeedbackWebpart.module.scss”导入样式;
从“./IFeedbackWebPartProps”导入{IFeedbackWebPartProps};
从“./ISPListItem”导入{ISPListItem};
导出默认类FeedbackWebpartWebPart扩展BaseClientSideWebPart{
公共呈现():void{
this.\u updateListItem=this.\u updateListItem.bind(this);
this.\u readListItem=this.\u readListItem.bind(this);
this.doElement.innerHTML=`
职务评估表
名称
职务
邮寄
使现代化
`;
//下面的绑定允许在渲染中和渲染外部使用setComment。
this.setComment=this.setComment.bind(this);
this.\u updateListItem=this.\u updateListItem.bind(this);
this.\u readListItem=this.\u readListItem.bind(this);
//抓住所有元素
//[0]-只需要第一个元素
//将此泛型元素强制转换为特定类型的元素(我知道它是),因为变量需要特定类型
const textInput:HTMLInputElement=this.DomeElement.getElementsByTagName(“输入”)[0]作为HTMLInputElement;
//setComment在事件侦听器中使用,每当用户键入此输入字段时,都会调用它。
textInput.addEventListener(“keyup”,this.setComment);
this.sendFeedback=this.sendFeedback.bind(this);
const submitbutton:HTMLButtonElement=this.doElement.getElementsByTagName(“按钮”)[0]作为HTMLButtonElement;
submitbutton.onclick=this.sendFeedback;
submitbutton.disabled=真;
}
private\u updateListItem():void{
const url:string=this.context.pageContext.site.absoluteUrl+“/_api/web/list/getbytitle('Feedback')/items(1)”;
常量项定义:任意={
“标题”:“修改的标题字段值!”};
常量头:任意={
“X-HTTP-Method”:“合并”,
“如果匹配”:“*”,
};
常量spHttpClientOptions:ISPHttpClientOptions={
“标题”:标题,
“body”:JSON.stringify(itemDefinition)
};
this.context.spHttpClient.post(url,spHttpClient.configurations.v1,sphttpclientations)
.然后((响应:SPHttpClientResponse)=>{
如果(response.status==204){
此操作失败。_operationResults.innerHTML=“更新:列表项已成功更新。”;
}否则{
这是._operationResults.innerHTML=“更新:列表项更新失败。”+response.status+“-”+response.statusText;
}
});
}
私有sendFeedback():void{
this.context.statusRenderer.clearError(this.doElement);
const paragraphElement:HTMLParagraphElement=this.DomeElement.getElementsByClassName(styles.successIndicator)[0]作为HTMLParagraphElement;
paragraphElement.innerHTML=“”;
if(this._commentText==未定义| | this._commentText.length==0){
this.context.statusRenderer.renderError(this.domeElement,“请键入评论或建议”);
回来
}
if(Environment.type==EnvironmentType.Local){
this.context.statusRenderer.renderError(this.doElement,“在本地工作台中运行时无法保存反馈”);
回来
}
const url:string=this.context.pageContext.site.absoluteUrl+“/\u api/web/list/getbytitle('Feedback')/items”;
常数项:任何={
“标题”:此文本,
“URL”:window.location.href,
“JobTitle”:此.\u JobTitle
};
常量spHttpClientOptions:ISPHttpClientOptions={
“body”:JSON.stringify(项)
};
很抱歉,有很多代码,但如果我不提供,我不知道您如何理解我需要知道的内容
我希望了解“发送”按钮是如何工作的,以及“更新”按钮是如何在单击时更新任何更改项的。看起来“发送”按钮onClick事件是用以下代码设置的:
const submitbutton: HTMLButtonElement = this.domElement.getElementsByTagName("BUTTON") [0] as HTMLButtonElement;
submitbutton.onclick = this.sendFeedback;
此处getElementsByTagName(“按钮”)[0]返回在上述HTML中使用创建的第一个元素
我猜按照同样的方法,更新按钮可以这样处理:
const updateButton: HTMLButtonElement = this.domElement.getElementsByTagName("BUTTON") [1] as HTMLButtonElement;
updateButton.onclick = this._updateListItem.bind(this);
请注意,索引从[0]更改为[1],以使用第二个按钮,以及bind()的用法。如果没有bind,在调用_updateListItem时,“this”将是未定义的。谢谢。更新按钮仍然没有做任何事情。是因为它需要自己的事件处理程序,还是我可以使用setComment(事件:event)一个?我得到了TypeError:单击更新按钮时无法将属性“innerHTML”设置为null。