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lmarena chat only

When you open the site https://lmarena.ai/ goes to the "Direct Chat" tab makes the model selection blocks, the chat window and the query input block fixed above all other elements.

// ==UserScript==
// @name         lmarena chat only
// @namespace    Apache-2.0
// @version      1.5.3
// @description  When you open the site https://lmarena.ai/ goes to the "Direct Chat" tab makes the model selection blocks, the chat window and the query input block fixed above all other elements.
// @author       Tony 0tis
// @license      Apache-2.0
// @match        *://lmarena.ai/
// @icon         https://lmarena.ai/favicon.ico
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    if(localStorage.alertShown){
        const originalAlert = window.alert;
        window.alert = ()=>{};
        setTimeout(()=>{
            window.alert = originalAlert
        }, 1000);
    }
    localStorage.alertShown = true;

    class lmsysChat {
        constructor(){
            this.button = null;
            this.tab = null;
            this.mode = null;
            this.timeouts = {};

            console.log('start check');
            this.setCss();
            this.setMeta();
            this.setObserver();
            this.setManifest('https://raw.githubusercontent.com/tony-0tis/manifests/refs/heads/main/lmarena.ai/manifest.json');
        }

        setMeta(){
            const meta = document.createElement('meta');
            meta.name = 'viewport';
            meta.content = 'width=device-width, initial-scale=1';
            document.head.appendChild(meta);
        }

        setObserver(){
            const observer = new MutationObserver((mutationsList, observer)=>{
                for (const mutation of mutationsList) {
                    for(const node of mutation.addedNodes){
                        if(node.nodeName === 'BUTTON' && node.innerText.includes('Direct Chat')){
                            console.log('select chat');
                            this.riseChat(node);
                        }
                    }
                }
            });
            observer.observe(document, {attributes: false, childList: true, characterData: false, subtree:true});
            document.addEventListener('beforeunload', ()=>{
                observer.disconnect();
            });
        }

        async riseChat(button){
            if(this.mode === 'tabs') {
                return;
            }

            if(!button.classList.contains('selected')){
                this.button = button;
                button.dispatchEvent(new Event('click'));
                await this._timeout(200);
            }

            const tab = document.querySelector(`#${button.getAttribute('aria-controls')}`);
            if(!tab) return;
            this.tab = tab;
            this.mode = 'chat';

            if(tab.classList.contains('directChat')) return;

            tab.classList.add('directChat');

            const inputComponent = this._find(tab, '[id="input_box"]', el=>el, true);
            if(inputComponent && !inputComponent.classList.contains('directChatInput')){
                inputComponent.classList.add('directChatInput');
                const button = inputComponent.querySelector('button');
                if(button && !button.classList.contains('directChatSend')){
                    button.classList.add('directChatSend');
                }
            }

            const descriptionsComponent = this._find(tab, 'button', el=>el.innerText.includes('Expand to see the'), true);
            if(descriptionsComponent && !descriptionsComponent.classList.contains('directChatDescriptions')){
                descriptionsComponent.classList.add('directChatDescriptions');
            }

            const upvoteComponent = this._find(tab, 'button', el=>el.innerText.includes('Upvote'), true);
            if(upvoteComponent && !upvoteComponent.classList.contains('directChatVotes')){
                upvoteComponent.classList.add('directChatVotes');
            }

            const maxTokensComponent = this._find(tab, 'span', el=>el.innerText.includes('Max output tokens'), true);
            if(maxTokensComponent){
                [...maxTokensComponent.querySelectorAll('input')].forEach(el=>{
                    el.value = el.max || 4096;
                });
            }

            const parametrs = this._find(tab, 'span', el=>el.innerText.includes('Parameters'));
            if(parametrs){
                parametrs.innerText += ' (Fine tuning)';
            }

            const selector = tab.querySelector('[role="listbox"]');
            if(selector && !tab.querySelector('.chatModeSwitcher')){
                const button = document.createElement('button');
                button.classList.add('chatModeSwitcher');
                button.addEventListener('click', e=>this._switchChatMode(e));
                button.innerHTML = '🪟';
                button.title = 'Switch fullscreen/tabs';
                selector.parentNode.insertBefore(button, selector);

                while(!tab.querySelector('.progress-text')){
                    await this._timeout(null, 'progress');
                }

                while(tab.querySelector('.progress-text')){
                    await this._timeout(null, 'progress');
                }

                let model = localStorage.getItem('lmsysChatModel');
                if(model){
                    this.model = model;
                    if(model !== selector.value){
                        selector.dispatchEvent(new Event('focus'));
                        await this._timeout(50, 'progress');

                        const select = tab.querySelector(`[aria-label="${model}"]`);
                        if(select){
                            console.log('change selected model to', select.innerText);
                            select.dispatchEvent(new Event('mousedown', {bubbles: true}));
                        }
                    }
                }
                setInterval(()=>this._changeModel(selector), 500);
            }
        }

        _switchChatMode(e){
            if(!this.tab) return;
            if(this.tab.classList.contains('directChat')){
                this.mode = 'tabs';
                this.tab.classList.remove('directChat');
                document.querySelector('html').style.overflow = 'auto'
            }
            else{
                this.mode = 'chat';
                this.tab.classList.add('directChat');
                document.querySelector('html').style.overflow = 'hidden';
            }
        }

        _changeModel(selector){
            if(!this.tab) return;
            if(selector.value === this.model) return;
            this.model = selector.value;
            localStorage.setItem('lmsysChatModel', selector.value);
            console.log('save selected model to:', selector.value);
        }

        _find(doc, where, filter, findParentComponent){
            let el = [...doc.querySelectorAll(where)].filter(filter)[0];

            if(el && findParentComponent){
                let s = el.parentNode;
                while(s){
                    if(s.id?.includes('component')){
                        break;
                    }

                    s = s.parentNode;
                }

                if(s) {
                    el = s;
                }
            }

            return el;
        }

        _timeout(timeout = 200, name = 'default'){
            clearTimeout(this.timeouts[name]);

            return new Promise(resolve=>{
                this.timeouts[name] = setTimeout(resolve, timeout);
            });
        }

        setManifest(manifestUrl){
            const manifest = document.createElement('link');
            manifest.rel = 'manifest'
            manifest.href = manifestUrl;
            document.head.appendChild(manifest);
        }

        setCss(){
            const css = document.createElement('style');
            css.innerHTML = `
html{
    overflow: hidden;
}
.directChat{
    position: fixed !important;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    z-index: 1000;
    padding: 5px !important;
    background: var(--body-background-fill);
}
.directChat>div{
    gap: 7px !important;
    height: 100%;
    max-width: 900px;
    margin: 0 auto;
}
.directChat>div>div:has(#chatbot){
    height: calc(100% - 305px);
}
.directChat>div>div>div:has(#chatbot){
    height: 100%;
}
.directChat #share-region-named, .directChat #share-region-named>div{
    height: 100%;
}
.directChat #notice_markdown, .directChat #ack_markdown{
    display: none;
}
.directChat .directChatSend{
    min-width: 90px !important;
}
.directChat .options{
    max-height: calc(100vh - 150px) !important;
}
.directChat .directChatDescriptions{
    display: none;
}
.directChat .directChatVotes{
    gap: 5px;
}
.directChat .directChatVotes>button{
    min-width: auto;
    padding: 5px;
    line-height: 1;
}
.directChat .directChatInput{
    gap: 5px;
}
.directChat #chatbot{
    height: 100% !important;
}
.directChat #input_box{
    padding: 0;
}
.chatModeSwitcher {
    padding: 8px !important;
    border-radius: 3px !important;
    background: #f36812 !important;
    margin: -6px 0 !important;
    margin-left: -12px !important;
    width: 55px !important;
    margin-right: 10px !important;
}
.chatModeSwitcher:hover{
    opacity: 0.8;
}
`;
            document.head.appendChild(css);
        }
    }

    new lmsysChat();
})();